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GNU GENERAL PUBLIC LICENSE
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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applications/external/esubghz_chat/application.fam vendored Normal file
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App(
appid="esubghz_chat",
name="Enhanced Sub-Ghz Chat",
apptype=FlipperAppType.EXTERNAL,
entry_point="esubghz_chat",
requires=[
"gui",
"subghz",
],
stack_size=8 * 1024,
fap_category="Sub-GHz",
fap_icon="assets/chat_10px.png",
fap_icon_assets="assets",
fap_icon_assets_symbol="esubghz_chat",
)

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483
applications/external/esubghz_chat/crypto/aes.c vendored Normal file
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/******************************************************************************
*
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
*
* This is a simple and straightforward implementation of the AES Rijndael
* 128-bit block cipher designed by Vincent Rijmen and Joan Daemen. The focus
* of this work was correctness & accuracy. It is written in 'C' without any
* particular focus upon optimization or speed. It should be endian (memory
* byte order) neutral since the few places that care are handled explicitly.
*
* This implementation of Rijndael was created by Steven M. Gibson of GRC.com.
*
* It is intended for general purpose use, but was written in support of GRC's
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
*
* See: http://csrc.nist.gov/archive/aes/rijndael/wsdindex.html
*
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
*
*******************************************************************************/
#include "aes.h"
static int aes_tables_inited = 0; // run-once flag for performing key
// expasion table generation (see below)
/*
* The following static local tables must be filled-in before the first use of
* the GCM or AES ciphers. They are used for the AES key expansion/scheduling
* and once built are read-only and thread safe. The "gcm_initialize" function
* must be called once during system initialization to populate these arrays
* for subsequent use by the AES key scheduler. If they have not been built
* before attempted use, an error will be returned to the caller.
*
* NOTE: GCM Encryption/Decryption does NOT REQUIRE AES decryption. Since
* GCM uses AES in counter-mode, where the AES cipher output is XORed with
* the GCM input, we ONLY NEED AES encryption. Thus, to save space AES
* decryption is typically disabled by setting AES_DECRYPTION to 0 in aes.h.
*/
// We always need our forward tables
static uchar FSb[256]; // Forward substitution box (FSb)
static uint32_t FT0[256]; // Forward key schedule assembly tables
static uint32_t FT1[256];
static uint32_t FT2[256];
static uint32_t FT3[256];
#if AES_DECRYPTION // We ONLY need reverse for decryption
static uchar RSb[256]; // Reverse substitution box (RSb)
static uint32_t RT0[256]; // Reverse key schedule assembly tables
static uint32_t RT1[256];
static uint32_t RT2[256];
static uint32_t RT3[256];
#endif /* AES_DECRYPTION */
static uint32_t RCON[10]; // AES round constants
/*
* Platform Endianness Neutralizing Load and Store Macro definitions
* AES wants platform-neutral Little Endian (LE) byte ordering
*/
#define GET_UINT32_LE(n,b,i) { \
(n) = ( (uint32_t) (b)[(i) ] ) \
| ( (uint32_t) (b)[(i) + 1] << 8 ) \
| ( (uint32_t) (b)[(i) + 2] << 16 ) \
| ( (uint32_t) (b)[(i) + 3] << 24 ); }
#define PUT_UINT32_LE(n,b,i) { \
(b)[(i) ] = (uchar) ( (n) ); \
(b)[(i) + 1] = (uchar) ( (n) >> 8 ); \
(b)[(i) + 2] = (uchar) ( (n) >> 16 ); \
(b)[(i) + 3] = (uchar) ( (n) >> 24 ); }
/*
* AES forward and reverse encryption round processing macros
*/
#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
{ \
X0 = *RK++ ^ FT0[ ( Y0 ) & 0xFF ] ^ \
FT1[ ( Y1 >> 8 ) & 0xFF ] ^ \
FT2[ ( Y2 >> 16 ) & 0xFF ] ^ \
FT3[ ( Y3 >> 24 ) & 0xFF ]; \
\
X1 = *RK++ ^ FT0[ ( Y1 ) & 0xFF ] ^ \
FT1[ ( Y2 >> 8 ) & 0xFF ] ^ \
FT2[ ( Y3 >> 16 ) & 0xFF ] ^ \
FT3[ ( Y0 >> 24 ) & 0xFF ]; \
\
X2 = *RK++ ^ FT0[ ( Y2 ) & 0xFF ] ^ \
FT1[ ( Y3 >> 8 ) & 0xFF ] ^ \
FT2[ ( Y0 >> 16 ) & 0xFF ] ^ \
FT3[ ( Y1 >> 24 ) & 0xFF ]; \
\
X3 = *RK++ ^ FT0[ ( Y3 ) & 0xFF ] ^ \
FT1[ ( Y0 >> 8 ) & 0xFF ] ^ \
FT2[ ( Y1 >> 16 ) & 0xFF ] ^ \
FT3[ ( Y2 >> 24 ) & 0xFF ]; \
}
#define AES_RROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \
{ \
X0 = *RK++ ^ RT0[ ( Y0 ) & 0xFF ] ^ \
RT1[ ( Y3 >> 8 ) & 0xFF ] ^ \
RT2[ ( Y2 >> 16 ) & 0xFF ] ^ \
RT3[ ( Y1 >> 24 ) & 0xFF ]; \
\
X1 = *RK++ ^ RT0[ ( Y1 ) & 0xFF ] ^ \
RT1[ ( Y0 >> 8 ) & 0xFF ] ^ \
RT2[ ( Y3 >> 16 ) & 0xFF ] ^ \
RT3[ ( Y2 >> 24 ) & 0xFF ]; \
\
X2 = *RK++ ^ RT0[ ( Y2 ) & 0xFF ] ^ \
RT1[ ( Y1 >> 8 ) & 0xFF ] ^ \
RT2[ ( Y0 >> 16 ) & 0xFF ] ^ \
RT3[ ( Y3 >> 24 ) & 0xFF ]; \
\
X3 = *RK++ ^ RT0[ ( Y3 ) & 0xFF ] ^ \
RT1[ ( Y2 >> 8 ) & 0xFF ] ^ \
RT2[ ( Y1 >> 16 ) & 0xFF ] ^ \
RT3[ ( Y0 >> 24 ) & 0xFF ]; \
}
/*
* These macros improve the readability of the key
* generation initialization code by collapsing
* repetitive common operations into logical pieces.
*/
#define ROTL8(x) ( ( x << 8 ) & 0xFFFFFFFF ) | ( x >> 24 )
#define XTIME(x) ( ( x << 1 ) ^ ( ( x & 0x80 ) ? 0x1B : 0x00 ) )
#define MUL(x,y) ( ( x && y ) ? pow[(log[x]+log[y]) % 255] : 0 )
#define MIX(x,y) { y = ( (y << 1) | (y >> 7) ) & 0xFF; x ^= y; }
#define CPY128 { *RK++ = *SK++; *RK++ = *SK++; \
*RK++ = *SK++; *RK++ = *SK++; }
/******************************************************************************
*
* AES_INIT_KEYGEN_TABLES
*
* Fills the AES key expansion tables allocated above with their static
* data. This is not "per key" data, but static system-wide read-only
* table data. THIS FUNCTION IS NOT THREAD SAFE. It must be called once
* at system initialization to setup the tables for all subsequent use.
*
******************************************************************************/
void aes_init_keygen_tables( void )
{
int i, x, y, z; // general purpose iteration and computation locals
int pow[256];
int log[256];
if (aes_tables_inited) return;
// fill the 'pow' and 'log' tables over GF(2^8)
for( i = 0, x = 1; i < 256; i++ ) {
pow[i] = x;
log[x] = i;
x = ( x ^ XTIME( x ) ) & 0xFF;
}
// compute the round constants
for( i = 0, x = 1; i < 10; i++ ) {
RCON[i] = (uint32_t) x;
x = XTIME( x ) & 0xFF;
}
// fill the forward and reverse substitution boxes
FSb[0x00] = 0x63;
#if AES_DECRYPTION // whether AES decryption is supported
RSb[0x63] = 0x00;
#endif /* AES_DECRYPTION */
for( i = 1; i < 256; i++ ) {
x = y = pow[255 - log[i]];
MIX(x,y);
MIX(x,y);
MIX(x,y);
MIX(x,y);
FSb[i] = (uchar) ( x ^= 0x63 );
#if AES_DECRYPTION // whether AES decryption is supported
RSb[x] = (uchar) i;
#endif /* AES_DECRYPTION */
}
// generate the forward and reverse key expansion tables
for( i = 0; i < 256; i++ ) {
x = FSb[i];
y = XTIME( x ) & 0xFF;
z = ( y ^ x ) & 0xFF;
FT0[i] = ( (uint32_t) y ) ^ ( (uint32_t) x << 8 ) ^
( (uint32_t) x << 16 ) ^ ( (uint32_t) z << 24 );
FT1[i] = ROTL8( FT0[i] );
FT2[i] = ROTL8( FT1[i] );
FT3[i] = ROTL8( FT2[i] );
#if AES_DECRYPTION // whether AES decryption is supported
x = RSb[i];
RT0[i] = ( (uint32_t) MUL( 0x0E, x ) ) ^
( (uint32_t) MUL( 0x09, x ) << 8 ) ^
( (uint32_t) MUL( 0x0D, x ) << 16 ) ^
( (uint32_t) MUL( 0x0B, x ) << 24 );
RT1[i] = ROTL8( RT0[i] );
RT2[i] = ROTL8( RT1[i] );
RT3[i] = ROTL8( RT2[i] );
#endif /* AES_DECRYPTION */
}
aes_tables_inited = 1; // flag that the tables have been generated
} // to permit subsequent use of the AES cipher
/******************************************************************************
*
* AES_SET_ENCRYPTION_KEY
*
* This is called by 'aes_setkey' when we're establishing a key for
* subsequent encryption. We give it a pointer to the encryption
* context, a pointer to the key, and the key's length in bytes.
* Valid lengths are: 16, 24 or 32 bytes (128, 192, 256 bits).
*
******************************************************************************/
int aes_set_encryption_key( aes_context *ctx,
const uchar *key,
uint keysize )
{
uint i; // general purpose iteration local
uint32_t *RK = ctx->rk; // initialize our RoundKey buffer pointer
for( i = 0; i < (keysize >> 2); i++ ) {
GET_UINT32_LE( RK[i], key, i << 2 );
}
switch( ctx->rounds )
{
case 10:
for( i = 0; i < 10; i++, RK += 4 ) {
RK[4] = RK[0] ^ RCON[i] ^
( (uint32_t) FSb[ ( RK[3] >> 8 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( RK[3] >> 16 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( RK[3] >> 24 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( RK[3] ) & 0xFF ] << 24 );
RK[5] = RK[1] ^ RK[4];
RK[6] = RK[2] ^ RK[5];
RK[7] = RK[3] ^ RK[6];
}
break;
case 12:
for( i = 0; i < 8; i++, RK += 6 ) {
RK[6] = RK[0] ^ RCON[i] ^
( (uint32_t) FSb[ ( RK[5] >> 8 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( RK[5] >> 16 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( RK[5] >> 24 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( RK[5] ) & 0xFF ] << 24 );
RK[7] = RK[1] ^ RK[6];
RK[8] = RK[2] ^ RK[7];
RK[9] = RK[3] ^ RK[8];
RK[10] = RK[4] ^ RK[9];
RK[11] = RK[5] ^ RK[10];
}
break;
case 14:
for( i = 0; i < 7; i++, RK += 8 ) {
RK[8] = RK[0] ^ RCON[i] ^
( (uint32_t) FSb[ ( RK[7] >> 8 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( RK[7] >> 16 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( RK[7] >> 24 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( RK[7] ) & 0xFF ] << 24 );
RK[9] = RK[1] ^ RK[8];
RK[10] = RK[2] ^ RK[9];
RK[11] = RK[3] ^ RK[10];
RK[12] = RK[4] ^
( (uint32_t) FSb[ ( RK[11] ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( RK[11] >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( RK[11] >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( RK[11] >> 24 ) & 0xFF ] << 24 );
RK[13] = RK[5] ^ RK[12];
RK[14] = RK[6] ^ RK[13];
RK[15] = RK[7] ^ RK[14];
}
break;
default:
return -1;
}
return( 0 );
}
#if AES_DECRYPTION // whether AES decryption is supported
/******************************************************************************
*
* AES_SET_DECRYPTION_KEY
*
* This is called by 'aes_setkey' when we're establishing a
* key for subsequent decryption. We give it a pointer to
* the encryption context, a pointer to the key, and the key's
* length in bits. Valid lengths are: 128, 192, or 256 bits.
*
******************************************************************************/
int aes_set_decryption_key( aes_context *ctx,
const uchar *key,
uint keysize )
{
int i, j;
aes_context cty; // a calling aes context for set_encryption_key
uint32_t *RK = ctx->rk; // initialize our RoundKey buffer pointer
uint32_t *SK;
int ret;
cty.rounds = ctx->rounds; // initialize our local aes context
cty.rk = cty.buf; // round count and key buf pointer
if (( ret = aes_set_encryption_key( &cty, key, keysize )) != 0 )
return( ret );
SK = cty.rk + cty.rounds * 4;
CPY128 // copy a 128-bit block from *SK to *RK
for( i = ctx->rounds - 1, SK -= 8; i > 0; i--, SK -= 8 ) {
for( j = 0; j < 4; j++, SK++ ) {
*RK++ = RT0[ FSb[ ( *SK ) & 0xFF ] ] ^
RT1[ FSb[ ( *SK >> 8 ) & 0xFF ] ] ^
RT2[ FSb[ ( *SK >> 16 ) & 0xFF ] ] ^
RT3[ FSb[ ( *SK >> 24 ) & 0xFF ] ];
}
}
CPY128 // copy a 128-bit block from *SK to *RK
memset( &cty, 0, sizeof( aes_context ) ); // clear local aes context
return( 0 );
}
#endif /* AES_DECRYPTION */
/******************************************************************************
*
* AES_SETKEY
*
* Invoked to establish the key schedule for subsequent encryption/decryption
*
******************************************************************************/
int aes_setkey( aes_context *ctx, // AES context provided by our caller
int mode, // ENCRYPT or DECRYPT flag
const uchar *key, // pointer to the key
uint keysize ) // key length in bytes
{
// since table initialization is not thread safe, we could either add
// system-specific mutexes and init the AES key generation tables on
// demand, or ask the developer to simply call "gcm_initialize" once during
// application startup before threading begins. That's what we choose.
if( !aes_tables_inited ) return ( -1 ); // fail the call when not inited.
ctx->mode = mode; // capture the key type we're creating
ctx->rk = ctx->buf; // initialize our round key pointer
switch( keysize ) // set the rounds count based upon the keysize
{
case 16: ctx->rounds = 10; break; // 16-byte, 128-bit key
case 24: ctx->rounds = 12; break; // 24-byte, 192-bit key
case 32: ctx->rounds = 14; break; // 32-byte, 256-bit key
default: return(-1);
}
#if AES_DECRYPTION
if( mode == DECRYPT ) // expand our key for encryption or decryption
return( aes_set_decryption_key( ctx, key, keysize ) );
else /* ENCRYPT */
#endif /* AES_DECRYPTION */
return( aes_set_encryption_key( ctx, key, keysize ) );
}
/******************************************************************************
*
* AES_CIPHER
*
* Perform AES encryption and decryption.
* The AES context will have been setup with the encryption mode
* and all keying information appropriate for the task.
*
******************************************************************************/
int aes_cipher( aes_context *ctx,
const uchar input[16],
uchar output[16] )
{
int i;
uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3; // general purpose locals
RK = ctx->rk;
GET_UINT32_LE( X0, input, 0 ); X0 ^= *RK++; // load our 128-bit
GET_UINT32_LE( X1, input, 4 ); X1 ^= *RK++; // input buffer in a storage
GET_UINT32_LE( X2, input, 8 ); X2 ^= *RK++; // memory endian-neutral way
GET_UINT32_LE( X3, input, 12 ); X3 ^= *RK++;
#if AES_DECRYPTION // whether AES decryption is supported
if( ctx->mode == DECRYPT )
{
for( i = (ctx->rounds >> 1) - 1; i > 0; i-- )
{
AES_RROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
AES_RROUND( X0, X1, X2, X3, Y0, Y1, Y2, Y3 );
}
AES_RROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
X0 = *RK++ ^ \
( (uint32_t) RSb[ ( Y0 ) & 0xFF ] ) ^
( (uint32_t) RSb[ ( Y3 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) RSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) RSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );
X1 = *RK++ ^ \
( (uint32_t) RSb[ ( Y1 ) & 0xFF ] ) ^
( (uint32_t) RSb[ ( Y0 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) RSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) RSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
X2 = *RK++ ^ \
( (uint32_t) RSb[ ( Y2 ) & 0xFF ] ) ^
( (uint32_t) RSb[ ( Y1 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) RSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) RSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );
X3 = *RK++ ^ \
( (uint32_t) RSb[ ( Y3 ) & 0xFF ] ) ^
( (uint32_t) RSb[ ( Y2 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) RSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) RSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );
}
else /* ENCRYPT */
{
#endif /* AES_DECRYPTION */
for( i = (ctx->rounds >> 1) - 1; i > 0; i-- )
{
AES_FROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
AES_FROUND( X0, X1, X2, X3, Y0, Y1, Y2, Y3 );
}
AES_FROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
X0 = *RK++ ^ \
( (uint32_t) FSb[ ( Y0 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( Y1 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );
X1 = *RK++ ^ \
( (uint32_t) FSb[ ( Y1 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( Y2 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );
X2 = *RK++ ^ \
( (uint32_t) FSb[ ( Y2 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( Y3 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );
X3 = *RK++ ^ \
( (uint32_t) FSb[ ( Y3 ) & 0xFF ] ) ^
( (uint32_t) FSb[ ( Y0 >> 8 ) & 0xFF ] << 8 ) ^
( (uint32_t) FSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
( (uint32_t) FSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
#if AES_DECRYPTION // whether AES decryption is supported
}
#endif /* AES_DECRYPTION */
PUT_UINT32_LE( X0, output, 0 );
PUT_UINT32_LE( X1, output, 4 );
PUT_UINT32_LE( X2, output, 8 );
PUT_UINT32_LE( X3, output, 12 );
return( 0 );
}
/* end of aes.c */

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/******************************************************************************
*
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
*
* This is a simple and straightforward implementation of the AES Rijndael
* 128-bit block cipher designed by Vincent Rijmen and Joan Daemen. The focus
* of this work was correctness & accuracy. It is written in 'C' without any
* particular focus upon optimization or speed. It should be endian (memory
* byte order) neutral since the few places that care are handled explicitly.
*
* This implementation of Rijndael was created by Steven M. Gibson of GRC.com.
*
* It is intended for general purpose use, but was written in support of GRC's
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
*
* See: http://csrc.nist.gov/archive/aes/rijndael/wsdindex.html
*
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
*
*******************************************************************************/
#ifndef AES_HEADER
#define AES_HEADER
/******************************************************************************/
#define AES_DECRYPTION 0 // whether AES decryption is supported
/******************************************************************************/
#include <string.h>
#define ENCRYPT 1 // specify whether we're encrypting
#define DECRYPT 0 // or decrypting
#if defined(_MSC_VER)
#include <basetsd.h>
typedef UINT32 uint32_t;
#else
#include <inttypes.h>
#endif
typedef unsigned char uchar; // add some convienent shorter types
typedef unsigned int uint;
/******************************************************************************
* AES_INIT_KEYGEN_TABLES : MUST be called once before any AES use
******************************************************************************/
void aes_init_keygen_tables( void );
/******************************************************************************
* AES_CONTEXT : cipher context / holds inter-call data
******************************************************************************/
typedef struct {
int mode; // 1 for Encryption, 0 for Decryption
int rounds; // keysize-based rounds count
uint32_t *rk; // pointer to current round key
uint32_t buf[68]; // key expansion buffer
} aes_context;
/******************************************************************************
* AES_SETKEY : called to expand the key for encryption or decryption
******************************************************************************/
int aes_setkey( aes_context *ctx, // pointer to context
int mode, // 1 or 0 for Encrypt/Decrypt
const uchar *key, // AES input key
uint keysize ); // size in bytes (must be 16, 24, 32 for
// 128, 192 or 256-bit keys respectively)
// returns 0 for success
/******************************************************************************
* AES_CIPHER : called to encrypt or decrypt ONE 128-bit block of data
******************************************************************************/
int aes_cipher( aes_context *ctx, // pointer to context
const uchar input[16], // 128-bit block to en/decipher
uchar output[16] ); // 128-bit output result block
// returns 0 for success
#endif /* AES_HEADER */

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/******************************************************************************
*
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
*
* This is a simple and straightforward implementation of AES-GCM authenticated
* encryption. The focus of this work was correctness & accuracy. It is written
* in straight 'C' without any particular focus upon optimization or speed. It
* should be endian (memory byte order) neutral since the few places that care
* are handled explicitly.
*
* This implementation of AES-GCM was created by Steven M. Gibson of GRC.com.
*
* It is intended for general purpose use, but was written in support of GRC's
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
*
* See: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
* http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/
* gcm/gcm-revised-spec.pdf
*
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
*
*******************************************************************************/
#include "gcm.h"
#include "aes.h"
/******************************************************************************
* ==== IMPLEMENTATION WARNING ====
*
* This code was developed for use within SQRL's fixed environmnent. Thus, it
* is somewhat less "general purpose" than it would be if it were designed as
* a general purpose AES-GCM library. Specifically, it bothers with almost NO
* error checking on parameter limits, buffer bounds, etc. It assumes that it
* is being invoked by its author or by someone who understands the values it
* expects to receive. Its behavior will be undefined otherwise.
*
* All functions that might fail are defined to return 'ints' to indicate a
* problem. Most do not do so now. But this allows for error propagation out
* of internal functions if robust error checking should ever be desired.
*
******************************************************************************/
/* Calculating the "GHASH"
*
* There are many ways of calculating the so-called GHASH in software, each with
* a traditional size vs performance tradeoff. The GHASH (Galois field hash) is
* an intriguing construction which takes two 128-bit strings (also the cipher's
* block size and the fundamental operation size for the system) and hashes them
* into a third 128-bit result.
*
* Many implementation solutions have been worked out that use large precomputed
* table lookups in place of more time consuming bit fiddling, and this approach
* can be scaled easily upward or downward as needed to change the time/space
* tradeoff. It's been studied extensively and there's a solid body of theory and
* practice. For example, without using any lookup tables an implementation
* might obtain 119 cycles per byte throughput, whereas using a simple, though
* large, key-specific 64 kbyte 8-bit lookup table the performance jumps to 13
* cycles per byte.
*
* And Intel's processors have, since 2010, included an instruction which does
* the entire 128x128->128 bit job in just several 64x64->128 bit pieces.
*
* Since SQRL is interactive, and only processing a few 128-bit blocks, I've
* settled upon a relatively slower but appealing small-table compromise which
* folds a bunch of not only time consuming but also bit twiddling into a simple
* 16-entry table which is attributed to Victor Shoup's 1996 work while at
* Bellcore: "On Fast and Provably Secure MessageAuthentication Based on
* Universal Hashing." See: http://www.shoup.net/papers/macs.pdf
* See, also section 4.1 of the "gcm-revised-spec" cited above.
*/
/*
* This 16-entry table of pre-computed constants is used by the
* GHASH multiplier to improve over a strictly table-free but
* significantly slower 128x128 bit multiple within GF(2^128).
*/
static const uint64_t last4[16] = {
0x0000, 0x1c20, 0x3840, 0x2460, 0x7080, 0x6ca0, 0x48c0, 0x54e0,
0xe100, 0xfd20, 0xd940, 0xc560, 0x9180, 0x8da0, 0xa9c0, 0xb5e0 };
/*
* Platform Endianness Neutralizing Load and Store Macro definitions
* GCM wants platform-neutral Big Endian (BE) byte ordering
*/
#define GET_UINT32_BE(n,b,i) { \
(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
| ( (uint32_t) (b)[(i) + 1] << 16 ) \
| ( (uint32_t) (b)[(i) + 2] << 8 ) \
| ( (uint32_t) (b)[(i) + 3] ); }
#define PUT_UINT32_BE(n,b,i) { \
(b)[(i) ] = (uchar) ( (n) >> 24 ); \
(b)[(i) + 1] = (uchar) ( (n) >> 16 ); \
(b)[(i) + 2] = (uchar) ( (n) >> 8 ); \
(b)[(i) + 3] = (uchar) ( (n) ); }
/******************************************************************************
*
* GCM_INITIALIZE
*
* Must be called once to initialize the GCM library.
*
* At present, this only calls the AES keygen table generator, which expands
* the AES keying tables for use. This is NOT A THREAD-SAFE function, so it
* MUST be called during system initialization before a multi-threading
* environment is running.
*
******************************************************************************/
int gcm_initialize( void )
{
aes_init_keygen_tables();
return( 0 );
}
/******************************************************************************
*
* GCM_MULT
*
* Performs a GHASH operation on the 128-bit input vector 'x', setting
* the 128-bit output vector to 'x' times H using our precomputed tables.
* 'x' and 'output' are seen as elements of GCM's GF(2^128) Galois field.
*
******************************************************************************/
static void gcm_mult( gcm_context *ctx, // pointer to established context
const uchar x[16], // pointer to 128-bit input vector
uchar output[16] ) // pointer to 128-bit output vector
{
int i;
uchar lo, hi, rem;
uint64_t zh, zl;
lo = (uchar)( x[15] & 0x0f );
hi = (uchar)( x[15] >> 4 );
zh = ctx->HH[lo];
zl = ctx->HL[lo];
for( i = 15; i >= 0; i-- ) {
lo = (uchar) ( x[i] & 0x0f );
hi = (uchar) ( x[i] >> 4 );
if( i != 15 ) {
rem = (uchar) ( zl & 0x0f );
zl = ( zh << 60 ) | ( zl >> 4 );
zh = ( zh >> 4 );
zh ^= (uint64_t) last4[rem] << 48;
zh ^= ctx->HH[lo];
zl ^= ctx->HL[lo];
}
rem = (uchar) ( zl & 0x0f );
zl = ( zh << 60 ) | ( zl >> 4 );
zh = ( zh >> 4 );
zh ^= (uint64_t) last4[rem] << 48;
zh ^= ctx->HH[hi];
zl ^= ctx->HL[hi];
}
PUT_UINT32_BE( zh >> 32, output, 0 );
PUT_UINT32_BE( zh, output, 4 );
PUT_UINT32_BE( zl >> 32, output, 8 );
PUT_UINT32_BE( zl, output, 12 );
}
/******************************************************************************
*
* GCM_SETKEY
*
* This is called to set the AES-GCM key. It initializes the AES key
* and populates the gcm context's pre-calculated HTables.
*
******************************************************************************/
int gcm_setkey( gcm_context *ctx, // pointer to caller-provided gcm context
const uchar *key, // pointer to the AES encryption key
const uint keysize) // size in bytes (must be 16, 24, 32 for
// 128, 192 or 256-bit keys respectively)
{
int ret, i, j;
uint64_t hi, lo;
uint64_t vl, vh;
unsigned char h[16];
memset( ctx, 0, sizeof(gcm_context) ); // zero caller-provided GCM context
memset( h, 0, 16 ); // initialize the block to encrypt
// encrypt the null 128-bit block to generate a key-based value
// which is then used to initialize our GHASH lookup tables
if(( ret = aes_setkey( &ctx->aes_ctx, ENCRYPT, key, keysize )) != 0 )
return( ret );
if(( ret = aes_cipher( &ctx->aes_ctx, h, h )) != 0 )
return( ret );
GET_UINT32_BE( hi, h, 0 ); // pack h as two 64-bit ints, big-endian
GET_UINT32_BE( lo, h, 4 );
vh = (uint64_t) hi << 32 | lo;
GET_UINT32_BE( hi, h, 8 );
GET_UINT32_BE( lo, h, 12 );
vl = (uint64_t) hi << 32 | lo;
ctx->HL[8] = vl; // 8 = 1000 corresponds to 1 in GF(2^128)
ctx->HH[8] = vh;
ctx->HH[0] = 0; // 0 corresponds to 0 in GF(2^128)
ctx->HL[0] = 0;
for( i = 4; i > 0; i >>= 1 ) {
uint32_t T = (uint32_t) ( vl & 1 ) * 0xe1000000U;
vl = ( vh << 63 ) | ( vl >> 1 );
vh = ( vh >> 1 ) ^ ( (uint64_t) T << 32);
ctx->HL[i] = vl;
ctx->HH[i] = vh;
}
for (i = 2; i < 16; i <<= 1 ) {
uint64_t *HiL = ctx->HL + i, *HiH = ctx->HH + i;
vh = *HiH;
vl = *HiL;
for( j = 1; j < i; j++ ) {
HiH[j] = vh ^ ctx->HH[j];
HiL[j] = vl ^ ctx->HL[j];
}
}
return( 0 );
}
/******************************************************************************
*
* GCM processing occurs four phases: SETKEY, START, UPDATE and FINISH.
*
* SETKEY:
*
* START: Sets the Encryption/Decryption mode.
* Accepts the initialization vector and additional data.
*
* UPDATE: Encrypts or decrypts the plaintext or ciphertext.
*
* FINISH: Performs a final GHASH to generate the authentication tag.
*
******************************************************************************
*
* GCM_START
*
* Given a user-provided GCM context, this initializes it, sets the encryption
* mode, and preprocesses the initialization vector and additional AEAD data.
*
******************************************************************************/
int gcm_start( gcm_context *ctx, // pointer to user-provided GCM context
int mode, // GCM_ENCRYPT or GCM_DECRYPT
const uchar *iv, // pointer to initialization vector
size_t iv_len, // IV length in bytes (should == 12)
const uchar *add, // ptr to additional AEAD data (NULL if none)
size_t add_len ) // length of additional AEAD data (bytes)
{
int ret; // our error return if the AES encrypt fails
uchar work_buf[16]; // XOR source built from provided IV if len != 16
const uchar *p; // general purpose array pointer
size_t use_len; // byte count to process, up to 16 bytes
size_t i; // local loop iterator
// since the context might be reused under the same key
// we zero the working buffers for this next new process
memset( ctx->y, 0x00, sizeof(ctx->y ) );
memset( ctx->buf, 0x00, sizeof(ctx->buf) );
ctx->len = 0;
ctx->add_len = 0;
ctx->mode = mode; // set the GCM encryption/decryption mode
ctx->aes_ctx.mode = ENCRYPT; // GCM *always* runs AES in ENCRYPTION mode
if( iv_len == 12 ) { // GCM natively uses a 12-byte, 96-bit IV
memcpy( ctx->y, iv, iv_len ); // copy the IV to the top of the 'y' buff
ctx->y[15] = 1; // start "counting" from 1 (not 0)
}
else // if we don't have a 12-byte IV, we GHASH whatever we've been given
{
memset( work_buf, 0x00, 16 ); // clear the working buffer
PUT_UINT32_BE( iv_len * 8, work_buf, 12 ); // place the IV into buffer
p = iv;
while( iv_len > 0 ) {
use_len = ( iv_len < 16 ) ? iv_len : 16;
for( i = 0; i < use_len; i++ ) ctx->y[i] ^= p[i];
gcm_mult( ctx, ctx->y, ctx->y );
iv_len -= use_len;
p += use_len;
}
for( i = 0; i < 16; i++ ) ctx->y[i] ^= work_buf[i];
gcm_mult( ctx, ctx->y, ctx->y );
}
if( ( ret = aes_cipher( &ctx->aes_ctx, ctx->y, ctx->base_ectr ) ) != 0 )
return( ret );
ctx->add_len = add_len;
p = add;
while( add_len > 0 ) {
use_len = ( add_len < 16 ) ? add_len : 16;
for( i = 0; i < use_len; i++ ) ctx->buf[i] ^= p[i];
gcm_mult( ctx, ctx->buf, ctx->buf );
add_len -= use_len;
p += use_len;
}
return( 0 );
}
/******************************************************************************
*
* GCM_UPDATE
*
* This is called once or more to process bulk plaintext or ciphertext data.
* We give this some number of bytes of input and it returns the same number
* of output bytes. If called multiple times (which is fine) all but the final
* invocation MUST be called with length mod 16 == 0. (Only the final call can
* have a partial block length of < 128 bits.)
*
******************************************************************************/
int gcm_update( gcm_context *ctx, // pointer to user-provided GCM context
size_t length, // length, in bytes, of data to process
const uchar *input, // pointer to source data
uchar *output ) // pointer to destination data
{
int ret; // our error return if the AES encrypt fails
uchar ectr[16]; // counter-mode cipher output for XORing
size_t use_len; // byte count to process, up to 16 bytes
size_t i; // local loop iterator
ctx->len += length; // bump the GCM context's running length count
while( length > 0 ) {
// clamp the length to process at 16 bytes
use_len = ( length < 16 ) ? length : 16;
// increment the context's 128-bit IV||Counter 'y' vector
for( i = 16; i > 12; i-- ) if( ++ctx->y[i - 1] != 0 ) break;
// encrypt the context's 'y' vector under the established key
if( ( ret = aes_cipher( &ctx->aes_ctx, ctx->y, ectr ) ) != 0 )
return( ret );
// encrypt or decrypt the input to the output
if( ctx->mode == ENCRYPT )
{
for( i = 0; i < use_len; i++ ) {
// XOR the cipher's ouptut vector (ectr) with our input
output[i] = (uchar) ( ectr[i] ^ input[i] );
// now we mix in our data into the authentication hash.
// if we're ENcrypting we XOR in the post-XOR (output)
// results, but if we're DEcrypting we XOR in the input
// data
ctx->buf[i] ^= output[i];
}
}
else
{
for( i = 0; i < use_len; i++ ) {
// but if we're DEcrypting we XOR in the input data first,
// i.e. before saving to ouput data, otherwise if the input
// and output buffer are the same (inplace decryption) we
// would not get the correct auth tag
ctx->buf[i] ^= input[i];
// XOR the cipher's ouptut vector (ectr) with our input
output[i] = (uchar) ( ectr[i] ^ input[i] );
}
}
gcm_mult( ctx, ctx->buf, ctx->buf ); // perform a GHASH operation
length -= use_len; // drop the remaining byte count to process
input += use_len; // bump our input pointer forward
output += use_len; // bump our output pointer forward
}
return( 0 );
}
/******************************************************************************
*
* GCM_FINISH
*
* This is called once after all calls to GCM_UPDATE to finalize the GCM.
* It performs the final GHASH to produce the resulting authentication TAG.
*
******************************************************************************/
int gcm_finish( gcm_context *ctx, // pointer to user-provided GCM context
uchar *tag, // pointer to buffer which receives the tag
size_t tag_len ) // length, in bytes, of the tag-receiving buf
{
uchar work_buf[16];
uint64_t orig_len = ctx->len * 8;
uint64_t orig_add_len = ctx->add_len * 8;
size_t i;
if( tag_len != 0 ) memcpy( tag, ctx->base_ectr, tag_len );
if( orig_len || orig_add_len ) {
memset( work_buf, 0x00, 16 );
PUT_UINT32_BE( ( orig_add_len >> 32 ), work_buf, 0 );
PUT_UINT32_BE( ( orig_add_len ), work_buf, 4 );
PUT_UINT32_BE( ( orig_len >> 32 ), work_buf, 8 );
PUT_UINT32_BE( ( orig_len ), work_buf, 12 );
for( i = 0; i < 16; i++ ) ctx->buf[i] ^= work_buf[i];
gcm_mult( ctx, ctx->buf, ctx->buf );
for( i = 0; i < tag_len; i++ ) tag[i] ^= ctx->buf[i];
}
return( 0 );
}
/******************************************************************************
*
* GCM_CRYPT_AND_TAG
*
* This either encrypts or decrypts the user-provided data and, either
* way, generates an authentication tag of the requested length. It must be
* called with a GCM context whose key has already been set with GCM_SETKEY.
*
* The user would typically call this explicitly to ENCRYPT a buffer of data
* and optional associated data, and produce its an authentication tag.
*
* To reverse the process the user would typically call the companion
* GCM_AUTH_DECRYPT function to decrypt data and verify a user-provided
* authentication tag. The GCM_AUTH_DECRYPT function calls this function
* to perform its decryption and tag generation, which it then compares.
*
******************************************************************************/
int gcm_crypt_and_tag(
gcm_context *ctx, // gcm context with key already setup
int mode, // cipher direction: GCM_ENCRYPT or GCM_DECRYPT
const uchar *iv, // pointer to the 12-byte initialization vector
size_t iv_len, // byte length if the IV. should always be 12
const uchar *add, // pointer to the non-ciphered additional data
size_t add_len, // byte length of the additional AEAD data
const uchar *input, // pointer to the cipher data source
uchar *output, // pointer to the cipher data destination
size_t length, // byte length of the cipher data
uchar *tag, // pointer to the tag to be generated
size_t tag_len ) // byte length of the tag to be generated
{ /*
assuming that the caller has already invoked gcm_setkey to
prepare the gcm context with the keying material, we simply
invoke each of the three GCM sub-functions in turn...
*/
gcm_start ( ctx, mode, iv, iv_len, add, add_len );
gcm_update ( ctx, length, input, output );
gcm_finish ( ctx, tag, tag_len );
return( 0 );
}
/******************************************************************************
*
* GCM_AUTH_DECRYPT
*
* This DECRYPTS a user-provided data buffer with optional associated data.
* It then verifies a user-supplied authentication tag against the tag just
* re-created during decryption to verify that the data has not been altered.
*
* This function calls GCM_CRYPT_AND_TAG (above) to perform the decryption
* and authentication tag generation.
*
******************************************************************************/
int gcm_auth_decrypt(
gcm_context *ctx, // gcm context with key already setup
const uchar *iv, // pointer to the 12-byte initialization vector
size_t iv_len, // byte length if the IV. should always be 12
const uchar *add, // pointer to the non-ciphered additional data
size_t add_len, // byte length of the additional AEAD data
const uchar *input, // pointer to the cipher data source
uchar *output, // pointer to the cipher data destination
size_t length, // byte length of the cipher data
const uchar *tag, // pointer to the tag to be authenticated
size_t tag_len ) // byte length of the tag <= 16
{
uchar check_tag[16]; // the tag generated and returned by decryption
int diff; // an ORed flag to detect authentication errors
size_t i; // our local iterator
/*
we use GCM_DECRYPT_AND_TAG (above) to perform our decryption
(which is an identical XORing to reverse the previous one)
and also to re-generate the matching authentication tag
*/
gcm_crypt_and_tag( ctx, DECRYPT, iv, iv_len, add, add_len,
input, output, length, check_tag, tag_len );
// now we verify the authentication tag in 'constant time'
for( diff = 0, i = 0; i < tag_len; i++ )
diff |= tag[i] ^ check_tag[i];
if( diff != 0 ) { // see whether any bits differed?
memset( output, 0, length ); // if so... wipe the output data
return( GCM_AUTH_FAILURE ); // return GCM_AUTH_FAILURE
}
return( 0 );
}
/******************************************************************************
*
* GCM_ZERO_CTX
*
* The GCM context contains both the GCM context and the AES context.
* This includes keying and key-related material which is security-
* sensitive, so it MUST be zeroed after use. This function does that.
*
******************************************************************************/
void gcm_zero_ctx( gcm_context *ctx )
{
// zero the context originally provided to us
memset( ctx, 0, sizeof( gcm_context ) );
}

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/******************************************************************************
*
* THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
*
* This is a simple and straightforward implementation of AES-GCM authenticated
* encryption. The focus of this work was correctness & accuracy. It is written
* in straight 'C' without any particular focus upon optimization or speed. It
* should be endian (memory byte order) neutral since the few places that care
* are handled explicitly.
*
* This implementation of AES-GCM was created by Steven M. Gibson of GRC.com.
*
* It is intended for general purpose use, but was written in support of GRC's
* reference implementation of the SQRL (Secure Quick Reliable Login) client.
*
* See: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
* http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/ \
* gcm/gcm-revised-spec.pdf
*
* NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
* REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
*
*******************************************************************************/
#ifndef GCM_HEADER
#define GCM_HEADER
#define GCM_AUTH_FAILURE 0x55555555 // authentication failure
#include "aes.h" // gcm_context includes aes_context
#if defined(_MSC_VER)
#include <basetsd.h>
typedef unsigned int size_t;// use the right type for length declarations
typedef UINT32 uint32_t;
typedef UINT64 uint64_t;
#else
#include <stdint.h>
#endif
/******************************************************************************
* GCM_CONTEXT : GCM context / holds keytables, instance data, and AES ctx
******************************************************************************/
typedef struct {
int mode; // cipher direction: encrypt/decrypt
uint64_t len; // cipher data length processed so far
uint64_t add_len; // total add data length
uint64_t HL[16]; // precalculated lo-half HTable
uint64_t HH[16]; // precalculated hi-half HTable
uchar base_ectr[16]; // first counter-mode cipher output for tag
uchar y[16]; // the current cipher-input IV|Counter value
uchar buf[16]; // buf working value
aes_context aes_ctx; // cipher context used
} gcm_context;
/******************************************************************************
* GCM_CONTEXT : MUST be called once before ANY use of this library
******************************************************************************/
int gcm_initialize( void );
/******************************************************************************
* GCM_SETKEY : sets the GCM (and AES) keying material for use
******************************************************************************/
int gcm_setkey( gcm_context *ctx, // caller-provided context ptr
const uchar *key, // pointer to cipher key
const uint keysize // size in bytes (must be 16, 24, 32 for
// 128, 192 or 256-bit keys respectively)
); // returns 0 for success
/******************************************************************************
*
* GCM_CRYPT_AND_TAG
*
* This either encrypts or decrypts the user-provided data and, either
* way, generates an authentication tag of the requested length. It must be
* called with a GCM context whose key has already been set with GCM_SETKEY.
*
* The user would typically call this explicitly to ENCRYPT a buffer of data
* and optional associated data, and produce its an authentication tag.
*
* To reverse the process the user would typically call the companion
* GCM_AUTH_DECRYPT function to decrypt data and verify a user-provided
* authentication tag. The GCM_AUTH_DECRYPT function calls this function
* to perform its decryption and tag generation, which it then compares.
*
******************************************************************************/
int gcm_crypt_and_tag(
gcm_context *ctx, // gcm context with key already setup
int mode, // cipher direction: ENCRYPT (1) or DECRYPT (0)
const uchar *iv, // pointer to the 12-byte initialization vector
size_t iv_len, // byte length if the IV. should always be 12
const uchar *add, // pointer to the non-ciphered additional data
size_t add_len, // byte length of the additional AEAD data
const uchar *input, // pointer to the cipher data source
uchar *output, // pointer to the cipher data destination
size_t length, // byte length of the cipher data
uchar *tag, // pointer to the tag to be generated
size_t tag_len ); // byte length of the tag to be generated
/******************************************************************************
*
* GCM_AUTH_DECRYPT
*
* This DECRYPTS a user-provided data buffer with optional associated data.
* It then verifies a user-supplied authentication tag against the tag just
* re-created during decryption to verify that the data has not been altered.
*
* This function calls GCM_CRYPT_AND_TAG (above) to perform the decryption
* and authentication tag generation.
*
******************************************************************************/
int gcm_auth_decrypt(
gcm_context *ctx, // gcm context with key already setup
const uchar *iv, // pointer to the 12-byte initialization vector
size_t iv_len, // byte length if the IV. should always be 12
const uchar *add, // pointer to the non-ciphered additional data
size_t add_len, // byte length of the additional AEAD data
const uchar *input, // pointer to the cipher data source
uchar *output, // pointer to the cipher data destination
size_t length, // byte length of the cipher data
const uchar *tag, // pointer to the tag to be authenticated
size_t tag_len ); // byte length of the tag <= 16
/******************************************************************************
*
* GCM_START
*
* Given a user-provided GCM context, this initializes it, sets the encryption
* mode, and preprocesses the initialization vector and additional AEAD data.
*
******************************************************************************/
int gcm_start( gcm_context *ctx, // pointer to user-provided GCM context
int mode, // ENCRYPT (1) or DECRYPT (0)
const uchar *iv, // pointer to initialization vector
size_t iv_len, // IV length in bytes (should == 12)
const uchar *add, // pointer to additional AEAD data (NULL if none)
size_t add_len ); // length of additional AEAD data (bytes)
/******************************************************************************
*
* GCM_UPDATE
*
* This is called once or more to process bulk plaintext or ciphertext data.
* We give this some number of bytes of input and it returns the same number
* of output bytes. If called multiple times (which is fine) all but the final
* invocation MUST be called with length mod 16 == 0. (Only the final call can
* have a partial block length of < 128 bits.)
*
******************************************************************************/
int gcm_update( gcm_context *ctx, // pointer to user-provided GCM context
size_t length, // length, in bytes, of data to process
const uchar *input, // pointer to source data
uchar *output ); // pointer to destination data
/******************************************************************************
*
* GCM_FINISH
*
* This is called once after all calls to GCM_UPDATE to finalize the GCM.
* It performs the final GHASH to produce the resulting authentication TAG.
*
******************************************************************************/
int gcm_finish( gcm_context *ctx, // pointer to user-provided GCM context
uchar *tag, // ptr to tag buffer - NULL if tag_len = 0
size_t tag_len ); // length, in bytes, of the tag-receiving buf
/******************************************************************************
*
* GCM_ZERO_CTX
*
* The GCM context contains both the GCM context and the AES context.
* This includes keying and key-related material which is security-
* sensitive, so it MUST be zeroed after use. This function does that.
*
******************************************************************************/
void gcm_zero_ctx( gcm_context *ctx );
#endif /* GCM_HEADER */

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#include <furi_hal.h>
#include <lib/mlib/m-dict.h>
#include <toolbox/sha256.h>
#ifndef FURI_HAL_CRYPTO_ADVANCED_AVAIL
#include "crypto/gcm.h"
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
#include "crypto_wrapper.h"
DICT_DEF2(ESubGhzChatReplayDict, uint64_t, uint32_t)
struct ESugGhzChatCryptoCtx {
uint8_t key[KEY_BITS / 8];
#ifndef FURI_HAL_CRYPTO_ADVANCED_AVAIL
gcm_context gcm_ctx;
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
ESubGhzChatReplayDict_t replay_dict;
uint64_t run_id;
uint32_t counter;
};
struct ESubGhzChatCryptoMsg {
uint64_t run_id;
uint32_t counter;
uint8_t iv[IV_BYTES];
uint8_t tag[TAG_BYTES];
uint8_t data[0];
} __attribute__ ((packed));
void crypto_init(void)
{
#ifndef FURI_HAL_CRYPTO_ADVANCED_AVAIL
/* init the GCM and AES tables */
gcm_initialize();
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
}
void crypto_explicit_bzero(void *s, size_t len)
{
memset(s, 0, len);
asm volatile("" ::: "memory");
}
ESubGhzChatCryptoCtx *crypto_ctx_alloc(void)
{
ESubGhzChatCryptoCtx *ret = malloc(sizeof(ESubGhzChatCryptoCtx));
if (ret != NULL) {
memset(ret, 0, sizeof(ESubGhzChatCryptoCtx));
ESubGhzChatReplayDict_init(ret->replay_dict);
ret->run_id = 0;
ret->counter = 1;
}
return ret;
}
void crypto_ctx_free(ESubGhzChatCryptoCtx *ctx)
{
crypto_ctx_clear(ctx);
ESubGhzChatReplayDict_clear(ctx->replay_dict);
free(ctx);
}
void crypto_ctx_clear(ESubGhzChatCryptoCtx *ctx)
{
crypto_explicit_bzero(ctx->key, sizeof(ctx->key));
#ifndef FURI_HAL_CRYPTO_ADVANCED_AVAIL
crypto_explicit_bzero(&(ctx->gcm_ctx), sizeof(ctx->gcm_ctx));
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
ESubGhzChatReplayDict_reset(ctx->replay_dict);
ctx->run_id = 0;
ctx->counter = 1;
}
static uint64_t crypto_calc_run_id(FuriString *flipper_name, uint32_t tick)
{
const char *fn = furi_string_get_cstr(flipper_name);
size_t fn_len = strlen(fn);
uint8_t h_in[fn_len + sizeof(uint32_t)];
memcpy(h_in, fn, fn_len);
memcpy(h_in + fn_len, &tick, sizeof(uint32_t));
uint8_t h_out[256];
sha256(h_in, fn_len + sizeof(uint32_t), h_out);
uint64_t run_id;
memcpy(&run_id, h_out, sizeof(uint64_t));
return run_id;
}
bool crypto_ctx_set_key(ESubGhzChatCryptoCtx *ctx, const uint8_t *key,
FuriString *flipper_name, uint32_t tick)
{
ctx->run_id = crypto_calc_run_id(flipper_name, tick);
ctx->counter = 1;
memcpy(ctx->key, key, KEY_BITS / 8);
#ifdef FURI_HAL_CRYPTO_ADVANCED_AVAIL
return true;
#else /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
return (gcm_setkey(&(ctx->gcm_ctx), key, KEY_BITS / 8) == 0);
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
}
void crypto_ctx_get_key(ESubGhzChatCryptoCtx *ctx, uint8_t *key)
{
memcpy(key, ctx->key, KEY_BITS / 8);
}
bool crypto_ctx_decrypt(ESubGhzChatCryptoCtx *ctx, uint8_t *in, size_t in_len,
uint8_t *out)
{
if (in_len < MSG_OVERHEAD + 1) {
return false;
}
struct ESubGhzChatCryptoMsg *msg = (struct ESubGhzChatCryptoMsg *) in;
// check if message is stale, if yes, discard
uint32_t *counter = ESubGhzChatReplayDict_get(ctx->replay_dict,
msg->run_id);
if (counter != NULL) {
if (*counter >= __ntohl(msg->counter)) {
return false;
}
}
// decrypt and auth message
#ifdef FURI_HAL_CRYPTO_ADVANCED_AVAIL
bool ret = (furi_hal_crypto_gcm_decrypt_and_verify(ctx->key,
msg->iv,
(uint8_t *) msg, RUN_ID_BYTES + COUNTER_BYTES,
msg->data, out,
in_len - MSG_OVERHEAD,
msg->tag) == FuriHalCryptoGCMStateOk);
#else /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
bool ret = (gcm_auth_decrypt(&(ctx->gcm_ctx),
msg->iv, IV_BYTES,
(uint8_t *) msg, RUN_ID_BYTES + COUNTER_BYTES,
msg->data, out,
in_len - MSG_OVERHEAD,
msg->tag, TAG_BYTES) == 0);
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
// if auth was successful update replay dict
if (ret) {
ESubGhzChatReplayDict_set_at(ctx->replay_dict, msg->run_id,
__ntohl(msg->counter));
}
return ret;
}
bool crypto_ctx_encrypt(ESubGhzChatCryptoCtx *ctx, uint8_t *in, size_t in_len,
uint8_t *out)
{
struct ESubGhzChatCryptoMsg *msg = (struct ESubGhzChatCryptoMsg *) out;
// fill message header
msg->run_id = ctx->run_id;
msg->counter = __htonl(ctx->counter);
furi_hal_random_fill_buf(msg->iv, IV_BYTES);
// encrypt message and store tag in header
#ifdef FURI_HAL_CRYPTO_ADVANCED_AVAIL
bool ret = (furi_hal_crypto_gcm_encrypt_and_tag(ctx->key,
msg->iv,
(uint8_t *) msg, RUN_ID_BYTES + COUNTER_BYTES,
in, msg->data,
in_len,
msg->tag) == FuriHalCryptoGCMStateOk);
#else /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
bool ret = (gcm_crypt_and_tag(&(ctx->gcm_ctx), ENCRYPT,
msg->iv, IV_BYTES,
(uint8_t *) msg, RUN_ID_BYTES + COUNTER_BYTES,
in, msg->data,
in_len,
msg->tag, TAG_BYTES) == 0);
#endif /* FURI_HAL_CRYPTO_ADVANCED_AVAIL */
// increase internal counter
if (ret) {
ctx->counter++;
}
return ret;
}

38
applications/external/esubghz_chat/crypto_wrapper.h vendored Normal file
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@@ -0,0 +1,38 @@
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#define RUN_ID_BYTES (sizeof(uint64_t))
#define COUNTER_BYTES (sizeof(uint32_t))
#define KEY_BITS 256
#define IV_BYTES 12
#define TAG_BYTES 16
#define MSG_OVERHEAD (RUN_ID_BYTES + COUNTER_BYTES + IV_BYTES + TAG_BYTES)
typedef struct ESugGhzChatCryptoCtx ESubGhzChatCryptoCtx;
void crypto_init(void);
/* Function to clear sensitive memory. */
void crypto_explicit_bzero(void *s, size_t len);
ESubGhzChatCryptoCtx *crypto_ctx_alloc(void);
void crypto_ctx_free(ESubGhzChatCryptoCtx *ctx);
void crypto_ctx_clear(ESubGhzChatCryptoCtx *ctx);
bool crypto_ctx_set_key(ESubGhzChatCryptoCtx *ctx, const uint8_t *key,
FuriString *flipper_name, uint32_t tick);
void crypto_ctx_get_key(ESubGhzChatCryptoCtx *ctx, uint8_t *key);
bool crypto_ctx_decrypt(ESubGhzChatCryptoCtx *ctx, uint8_t *in, size_t in_len,
uint8_t *out);
bool crypto_ctx_encrypt(ESubGhzChatCryptoCtx *ctx, uint8_t *in, size_t in_len,
uint8_t *out);
#ifdef __cplusplus
}
#endif

737
applications/external/esubghz_chat/esubghz_chat.c vendored Normal file
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@@ -0,0 +1,737 @@
#include <furi_hal.h>
#include <gui/elements.h>
#include <gui/gui.h>
#include <lib/subghz/devices/cc1101_int/cc1101_int_interconnect.h>
#include "esubghz_chat_i.h"
#define CHAT_LEAVE_DELAY 10
#define TICK_INTERVAL 50
#define MESSAGE_COMPLETION_TIMEOUT 500
#define TIMEOUT_BETWEEN_MESSAGES 500
#define KBD_UNLOCK_CNT 3
#define KBD_UNLOCK_TIMEOUT 1000
/* Callback for RX events from the Sub-GHz worker. Records the current ticks as
* the time of the last reception. */
static void have_read_cb(void* context)
{
furi_assert(context);
ESubGhzChatState* state = context;
state->last_time_rx_data = furi_get_tick();
}
/* Sets the header for the chat input field depending on whether or not a
* message preview exists. */
void set_chat_input_header(ESubGhzChatState *state)
{
if (strlen(state->msg_preview) == 0) {
text_input_set_header_text(state->text_input, "Message");
} else {
text_input_set_header_text(state->text_input,
state->msg_preview);
}
}
/* Appends the latest message to the chat box and prepares the message preview.
*/
void append_msg(ESubGhzChatState *state, const char *msg)
{
/* append message to text box */
furi_string_cat_printf(state->chat_box_store, "\n%s", msg);
/* prepare message preview */
strncpy(state->msg_preview, msg, MSG_PREVIEW_SIZE);
state->msg_preview[MSG_PREVIEW_SIZE] = 0;
set_chat_input_header(state);
/* reset text box contents and focus */
text_box_set_text(state->chat_box,
furi_string_get_cstr(state->chat_box_store));
text_box_set_focus(state->chat_box, TextBoxFocusEnd);
}
/* Decrypts a message for post_rx(). */
static bool post_rx_decrypt(ESubGhzChatState *state, size_t rx_size)
{
bool ret = crypto_ctx_decrypt(state->crypto_ctx,
state->rx_buffer, rx_size,
(uint8_t*) state->rx_str_buffer);
if (ret) {
state->rx_str_buffer[rx_size - (MSG_OVERHEAD)] = 0;
} else {
state->rx_str_buffer[0] = 0;
}
return ret;
}
/* Post RX handler, decrypts received messages and calls append_msg(). */
static void post_rx(ESubGhzChatState *state, size_t rx_size)
{
furi_assert(state);
if (rx_size == 0) {
return;
}
furi_check(rx_size <= RX_TX_BUFFER_SIZE);
/* decrypt if necessary */
if (!state->encrypted) {
memcpy(state->rx_str_buffer, state->rx_buffer, rx_size);
state->rx_str_buffer[rx_size] = 0;
/* remove trailing newline if it is there, for compat with CLI
* Sub-GHz chat */
if (state->rx_str_buffer[rx_size - 1] == '\n') {
state->rx_str_buffer[rx_size - 1] = 0;
}
} else {
/* if decryption fails output an error message */
if (!post_rx_decrypt(state, rx_size)) {
strcpy(state->rx_str_buffer, "ERR: Decryption failed!");
}
}
/* append message to text box and prepare message preview */
append_msg(state, state->rx_str_buffer);
/* send notification (make the flipper vibrate) */
notification_message(state->notification, &sequence_single_vibro);
}
/* Reads the message from msg_input, encrypts it if necessary and then
* transmits it. */
void tx_msg_input(ESubGhzChatState *state)
{
/* encrypt message if necessary */
size_t msg_len = strlen(furi_string_get_cstr(state->msg_input));
size_t tx_size = msg_len;
if (state->encrypted) {
tx_size += MSG_OVERHEAD;
furi_check(tx_size <= sizeof(state->tx_buffer));
crypto_ctx_encrypt(state->crypto_ctx,
(uint8_t *)
furi_string_get_cstr(state->msg_input),
msg_len,
state->tx_buffer);
} else {
tx_size += 2;
furi_check(tx_size <= sizeof(state->tx_buffer));
memcpy(state->tx_buffer,
furi_string_get_cstr(state->msg_input),
msg_len);
/* append \r\n for compat with Sub-GHz CLI chat */
state->tx_buffer[msg_len] = '\r';
state->tx_buffer[msg_len + 1] = '\n';
}
/* transmit */
subghz_tx_rx_worker_write(state->subghz_worker, state->tx_buffer,
tx_size);
}
/* Displays whether or not encryption has been enabled in the text box. Also
* clears the text input buffer to remove the password and starts the Sub-GHz
* worker. After starting the worker a join message is transmitted. */
void enter_chat(ESubGhzChatState *state)
{
furi_string_cat_printf(state->chat_box_store, "\nEncrypted: %s",
(state->encrypted ? "yes" : "no"));
subghz_tx_rx_worker_start(state->subghz_worker, state->subghz_device,
state->frequency);
/* concatenate the name prefix and join message */
furi_string_set(state->msg_input, state->name_prefix);
furi_string_cat_str(state->msg_input, " joined chat.");
/* encrypt and transmit message */
tx_msg_input(state);
/* clear message input buffer */
furi_string_set_char(state->msg_input, 0, 0);
}
/* Sends a leave message */
void exit_chat(ESubGhzChatState *state)
{
/* concatenate the name prefix and leave message */
furi_string_set(state->msg_input, state->name_prefix);
furi_string_cat_str(state->msg_input, " left chat.");
/* encrypt and transmit message */
tx_msg_input(state);
/* clear message input buffer */
furi_string_set_char(state->msg_input, 0, 0);
/* wait for leave message to be delivered */
furi_delay_ms(CHAT_LEAVE_DELAY);
}
/* Whether or not to display the locked message. */
static bool kbd_lock_msg_display(ESubGhzChatState *state)
{
return (state->kbd_lock_msg_ticks != 0);
}
/* Whether or not to hide the locked message again. */
static bool kbd_lock_msg_reset_timeout(ESubGhzChatState *state)
{
if (state->kbd_lock_msg_ticks == 0) {
return false;
}
if (furi_get_tick() - state->kbd_lock_msg_ticks > KBD_UNLOCK_TIMEOUT) {
return true;
}
return false;
}
/* Resets the timeout for the locked message and turns off the backlight if
* specified. */
static void kbd_lock_msg_reset(ESubGhzChatState *state, bool backlight_off)
{
state->kbd_lock_msg_ticks = 0;
state->kbd_lock_count = 0;
if (backlight_off) {
notification_message(state->notification,
&sequence_display_backlight_off);
}
}
/* Locks the keyboard. */
static void kbd_lock(ESubGhzChatState *state)
{
state->kbd_locked = true;
kbd_lock_msg_reset(state, true);
}
/* Unlocks the keyboard. */
static void kbd_unlock(ESubGhzChatState *state)
{
state->kbd_locked = false;
kbd_lock_msg_reset(state, false);
}
/* Custom event callback for view dispatcher. Just calls scene manager. */
static bool esubghz_chat_custom_event_callback(void* context, uint32_t event)
{
FURI_LOG_T(APPLICATION_NAME, "esubghz_chat_custom_event_callback");
furi_assert(context);
ESubGhzChatState* state = context;
return scene_manager_handle_custom_event(state->scene_manager, event);
}
/* Navigation event callback for view dispatcher. Just calls scene manager. */
static bool esubghz_chat_navigation_event_callback(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "esubghz_chat_navigation_event_callback");
furi_assert(context);
ESubGhzChatState* state = context;
return scene_manager_handle_back_event(state->scene_manager);
}
/* Tick event callback for view dispatcher. Called every TICK_INTERVAL. Resets
* the locked message if necessary. Retrieves a received message from the
* Sub-GHz worker and calls post_rx(). Then calls the scene manager. */
static void esubghz_chat_tick_event_callback(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "esubghz_chat_tick_event_callback");
furi_assert(context);
ESubGhzChatState* state = context;
/* reset locked message if necessary */
if (kbd_lock_msg_reset_timeout(state)) {
kbd_lock_msg_reset(state, true);
}
/* if the maximum message size was reached or the
* MESSAGE_COMPLETION_TIMEOUT has expired, retrieve a message and call
* post_rx() */
size_t avail = 0;
while ((avail = subghz_tx_rx_worker_available(state->subghz_worker)) >
0) {
volatile uint32_t since_last_rx = furi_get_tick() -
state->last_time_rx_data;
if (avail < RX_TX_BUFFER_SIZE && since_last_rx <
MESSAGE_COMPLETION_TIMEOUT) {
break;
}
size_t rx_size = subghz_tx_rx_worker_read(state->subghz_worker,
state->rx_buffer, RX_TX_BUFFER_SIZE);
post_rx(state, rx_size);
}
/* call scene manager */
scene_manager_handle_tick_event(state->scene_manager);
}
/* Hooks into the view port's draw callback to overlay the keyboard locked
* message. */
static void esubghz_hooked_draw_callback(Canvas* canvas, void* context)
{
FURI_LOG_T(APPLICATION_NAME, "esubghz_hooked_draw_callback");
furi_assert(canvas);
furi_assert(context);
ESubGhzChatState* state = context;
/* call original callback */
state->orig_draw_cb(canvas, state->view_dispatcher);
/* display if the keyboard is locked */
if (state->kbd_locked) {
canvas_set_font(canvas, FontPrimary);
elements_multiline_text_framed(canvas, 42, 30, "Locked");
}
/* display the unlock message if necessary */
if (kbd_lock_msg_display(state)) {
canvas_set_font(canvas, FontSecondary);
elements_bold_rounded_frame(canvas, 14, 8, 99, 48);
elements_multiline_text(canvas, 65, 26, "To unlock\npress:");
canvas_draw_icon(canvas, 65, 42, &I_Pin_back_arrow_10x8);
canvas_draw_icon(canvas, 80, 42, &I_Pin_back_arrow_10x8);
canvas_draw_icon(canvas, 95, 42, &I_Pin_back_arrow_10x8);
canvas_draw_icon(canvas, 16, 13, &I_WarningDolphin_45x42);
}
}
/* Hooks into the view port's input callback to handle the user locking the
* keyboard. */
static void esubghz_hooked_input_callback(InputEvent* event, void* context)
{
FURI_LOG_T(APPLICATION_NAME, "esubghz_hooked_input_callback");
furi_assert(event);
furi_assert(context);
ESubGhzChatState* state = context;
/* if the keyboard is locked no key presses are forwarded */
if (state->kbd_locked) {
/* key has been pressed, display the unlock message and
* initiate the timer */
if (state->kbd_lock_count == 0) {
state->kbd_lock_msg_ticks = furi_get_tick();
}
/* back button has been pressed, increase the lock counter */
if (event->key == InputKeyBack && event->type ==
InputTypeShort) {
state->kbd_lock_count++;
}
/* unlock the keyboard */
if (state->kbd_lock_count >= KBD_UNLOCK_CNT) {
kbd_unlock(state);
}
/* do not handle the event */
return;
}
if (event->key == InputKeyOk) {
/* if we are in the chat view and no input is ongoing, allow
* locking */
if (state->view_dispatcher->current_view ==
text_box_get_view(state->chat_box) &&
!(state->kbd_ok_input_ongoing)) {
/* lock keyboard upon long press of Ok button */
if (event->type == InputTypeLong) {
kbd_lock(state);
}
/* do not handle any Ok key events to prevent blocking
* of other keys */
return;
}
/* handle ongoing inputs when changing to chat view */
if (event->type == InputTypePress) {
state->kbd_ok_input_ongoing = true;
} else if (event->type == InputTypeRelease) {
state->kbd_ok_input_ongoing = false;
}
}
if (event->key == InputKeyLeft) {
/* if we are in the chat view and no input is ongoing, allow
* switching to msg input */
if (state->view_dispatcher->current_view ==
text_box_get_view(state->chat_box) &&
!(state->kbd_left_input_ongoing)) {
/* go to msg input upon short press of Left button */
if (event->type == InputTypeShort) {
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_GotoMsgInput);
}
/* do not handle any Left key events to prevent
* blocking of other keys */
return;
}
/* handle ongoing inputs when changing to chat view */
if (event->type == InputTypePress) {
state->kbd_left_input_ongoing = true;
} else if (event->type == InputTypeRelease) {
state->kbd_left_input_ongoing = false;
}
}
if (event->key == InputKeyRight) {
/* if we are in the chat view and no input is ongoing, allow
* switching to key display */
if (state->view_dispatcher->current_view ==
text_box_get_view(state->chat_box) &&
!(state->kbd_right_input_ongoing)) {
/* go to key display upon short press of Right button
*/
if (event->type == InputTypeShort) {
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_GotoKeyDisplay);
}
/* do not handle any Right key events to prevent
* blocking of other keys */
return;
}
/* handle ongoing inputs when changing to chat view */
if (event->type == InputTypePress) {
state->kbd_right_input_ongoing = true;
} else if (event->type == InputTypeRelease) {
state->kbd_right_input_ongoing = false;
}
}
/* call original callback */
state->orig_input_cb(event, state->view_dispatcher);
}
static bool helper_strings_alloc(ESubGhzChatState *state)
{
furi_assert(state);
state->name_prefix = furi_string_alloc();
if (state->name_prefix == NULL) {
return false;
}
state->msg_input = furi_string_alloc();
if (state->msg_input == NULL) {
furi_string_free(state->name_prefix);
return false;
}
return true;
}
static void helper_strings_free(ESubGhzChatState *state)
{
furi_assert(state);
furi_string_free(state->name_prefix);
furi_string_free(state->msg_input);
}
static bool chat_box_alloc(ESubGhzChatState *state)
{
furi_assert(state);
state->chat_box = text_box_alloc();
if (state->chat_box == NULL) {
return false;
}
state->chat_box_store = furi_string_alloc();
if (state->chat_box_store == NULL) {
text_box_free(state->chat_box);
return false;
}
furi_string_reserve(state->chat_box_store, CHAT_BOX_STORE_SIZE);
furi_string_set_char(state->chat_box_store, 0, 0);
text_box_set_text(state->chat_box,
furi_string_get_cstr(state->chat_box_store));
text_box_set_focus(state->chat_box, TextBoxFocusEnd);
return true;
}
static void chat_box_free(ESubGhzChatState *state)
{
furi_assert(state);
text_box_free(state->chat_box);
furi_string_free(state->chat_box_store);
}
int32_t esubghz_chat(void)
{
/* init the crypto system */
crypto_init();
int32_t err = -1;
FURI_LOG_I(APPLICATION_NAME, "Starting...");
/* allocate necessary structs and buffers */
ESubGhzChatState *state = malloc(sizeof(ESubGhzChatState));
if (state == NULL) {
goto err_alloc;
}
memset(state, 0, sizeof(*state));
state->scene_manager = scene_manager_alloc(
&esubghz_chat_scene_event_handlers, state);
if (state->scene_manager == NULL) {
goto err_alloc_sm;
}
state->view_dispatcher = view_dispatcher_alloc();
if (state->view_dispatcher == NULL) {
goto err_alloc_vd;
}
if (!helper_strings_alloc(state)) {
goto err_alloc_hs;
}
state->menu = menu_alloc();
if (state->menu == NULL) {
goto err_alloc_menu;
}
state->text_input = text_input_alloc();
if (state->text_input == NULL) {
goto err_alloc_ti;
}
state->hex_key_input = byte_input_alloc();
if (state->hex_key_input == NULL) {
goto err_alloc_hki;
}
if (!chat_box_alloc(state)) {
goto err_alloc_cb;
}
state->key_display = dialog_ex_alloc();
if (state->key_display == NULL) {
goto err_alloc_kd;
}
state->nfc_popup = popup_alloc();
if (state->nfc_popup == NULL) {
goto err_alloc_np;
}
state->subghz_worker = subghz_tx_rx_worker_alloc();
if (state->subghz_worker == NULL) {
goto err_alloc_worker;
}
state->nfc_worker = nfc_worker_alloc();
if (state->nfc_worker == NULL) {
goto err_alloc_nworker;
}
state->nfc_dev_data = malloc(sizeof(NfcDeviceData));
if (state->nfc_dev_data == NULL) {
goto err_alloc_ndevdata;
}
memset(state->nfc_dev_data, 0, sizeof(NfcDeviceData));
state->crypto_ctx = crypto_ctx_alloc();
if (state->crypto_ctx == NULL) {
goto err_alloc_crypto;
}
/* set the have_read callback of the Sub-GHz worker */
subghz_tx_rx_worker_set_callback_have_read(state->subghz_worker,
have_read_cb, state);
/* enter suppress charge mode */
furi_hal_power_suppress_charge_enter();
/* init internal device */
subghz_devices_init();
state->subghz_device = subghz_devices_get_by_name(SUBGHZ_DEVICE_CC1101_INT_NAME);
/* set chat name prefix */
furi_string_printf(state->name_prefix, "%s",
furi_hal_version_get_name_ptr());
/* get notification record, we use this to make the flipper vibrate */
/* no error handling here, don't know how */
state->notification = furi_record_open(RECORD_NOTIFICATION);
/* hook into the view port's draw and input callbacks */
state->orig_draw_cb = state->view_dispatcher->view_port->draw_callback;
state->orig_input_cb = state->view_dispatcher->view_port->input_callback;
view_port_draw_callback_set(state->view_dispatcher->view_port,
esubghz_hooked_draw_callback, state);
view_port_input_callback_set(state->view_dispatcher->view_port,
esubghz_hooked_input_callback, state);
view_dispatcher_enable_queue(state->view_dispatcher);
/* set callbacks for view dispatcher */
view_dispatcher_set_event_callback_context(state->view_dispatcher, state);
view_dispatcher_set_custom_event_callback(
state->view_dispatcher,
esubghz_chat_custom_event_callback);
view_dispatcher_set_navigation_event_callback(
state->view_dispatcher,
esubghz_chat_navigation_event_callback);
view_dispatcher_set_tick_event_callback(
state->view_dispatcher,
esubghz_chat_tick_event_callback,
TICK_INTERVAL);
/* add our two views to the view dispatcher */
view_dispatcher_add_view(state->view_dispatcher, ESubGhzChatView_Menu,
menu_get_view(state->menu));
view_dispatcher_add_view(state->view_dispatcher, ESubGhzChatView_Input,
text_input_get_view(state->text_input));
view_dispatcher_add_view(state->view_dispatcher, ESubGhzChatView_HexKeyInput,
byte_input_get_view(state->hex_key_input));
view_dispatcher_add_view(state->view_dispatcher, ESubGhzChatView_ChatBox,
text_box_get_view(state->chat_box));
view_dispatcher_add_view(state->view_dispatcher, ESubGhzChatView_KeyDisplay,
dialog_ex_get_view(state->key_display));
view_dispatcher_add_view(state->view_dispatcher, ESubGhzChatView_NfcPopup,
popup_get_view(state->nfc_popup));
/* get the GUI record and attach the view dispatcher to the GUI */
/* no error handling here, don't know how */
Gui *gui = furi_record_open(RECORD_GUI);
view_dispatcher_attach_to_gui(state->view_dispatcher, gui,
ViewDispatcherTypeFullscreen);
/* switch to the frequency input scene */
scene_manager_next_scene(state->scene_manager, ESubGhzChatScene_FreqInput);
/* run the view dispatcher, this call only returns when we close the
* application */
view_dispatcher_run(state->view_dispatcher);
/* if it is running, stop the Sub-GHz worker */
if (subghz_tx_rx_worker_is_running(state->subghz_worker)) {
exit_chat(state);
subghz_tx_rx_worker_stop(state->subghz_worker);
}
/* if it is running, stop the NFC worker */
nfc_worker_stop(state->nfc_worker);
err = 0;
/* close GUI record */
furi_record_close(RECORD_GUI);
/* remove our two views from the view dispatcher */
view_dispatcher_remove_view(state->view_dispatcher,
ESubGhzChatView_Menu);
view_dispatcher_remove_view(state->view_dispatcher,
ESubGhzChatView_Input);
view_dispatcher_remove_view(state->view_dispatcher,
ESubGhzChatView_HexKeyInput);
view_dispatcher_remove_view(state->view_dispatcher,
ESubGhzChatView_ChatBox);
view_dispatcher_remove_view(state->view_dispatcher,
ESubGhzChatView_KeyDisplay);
view_dispatcher_remove_view(state->view_dispatcher,
ESubGhzChatView_NfcPopup);
/* close notification record */
furi_record_close(RECORD_NOTIFICATION);
/* clear the key and potential password */
crypto_explicit_bzero(state->text_input_store,
sizeof(state->text_input_store));
crypto_explicit_bzero(state->hex_key_input_store,
sizeof(state->hex_key_input_store));
crypto_explicit_bzero(state->key_hex_str, sizeof(state->key_hex_str));
crypto_ctx_clear(state->crypto_ctx);
/* clear nfc data */
if (state->nfc_dev_data->parsed_data != NULL) {
furi_string_free(state->nfc_dev_data->parsed_data);
}
crypto_explicit_bzero(state->nfc_dev_data, sizeof(NfcDeviceData));
/* deinit devices */
subghz_devices_deinit();
/* exit suppress charge mode */
furi_hal_power_suppress_charge_exit();
/* free everything we allocated */
crypto_ctx_free(state->crypto_ctx);
err_alloc_crypto:
free(state->nfc_dev_data);
err_alloc_ndevdata:
nfc_worker_free(state->nfc_worker);
err_alloc_nworker:
subghz_tx_rx_worker_free(state->subghz_worker);
err_alloc_worker:
popup_free(state->nfc_popup);
err_alloc_np:
dialog_ex_free(state->key_display);
err_alloc_kd:
chat_box_free(state);
err_alloc_cb:
byte_input_free(state->hex_key_input);
err_alloc_hki:
text_input_free(state->text_input);
err_alloc_ti:
menu_free(state->menu);
err_alloc_menu:
helper_strings_free(state);
err_alloc_hs:
view_dispatcher_free(state->view_dispatcher);
err_alloc_vd:
scene_manager_free(state->scene_manager);
err_alloc_sm:
free(state);
err_alloc:
if (err != 0) {
FURI_LOG_E(APPLICATION_NAME, "Failed to launch (alloc error)!");
} else {
FURI_LOG_I(APPLICATION_NAME, "Clean exit.");
}
return err;
}

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applications/external/esubghz_chat/esubghz_chat_i.h vendored Normal file
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#pragma once
#include <furi.h>
#include <gui/view_dispatcher_i.h>
#include <gui/view_port_i.h>
#include <gui/scene_manager.h>
#include <gui/modules/byte_input.h>
#include <gui/modules/dialog_ex.h>
#include <gui/modules/menu.h>
#include <gui/modules/popup.h>
#include <gui/modules/text_box.h>
#include <gui/modules/text_input.h>
#include <notification/notification_messages.h>
#include <lib/nfc/nfc_worker.h>
#include <lib/subghz/subghz_tx_rx_worker.h>
#include <toolbox/sha256.h>
#include "crypto_wrapper.h"
#include "scenes/esubghz_chat_scene.h"
#include <assets_icons.h>
#include "esubghz_chat_icons.h"
#define APPLICATION_NAME "ESubGhzChat"
#define DEFAULT_FREQ 433920000
#define KEY_READ_POPUP_MS 3000
#define RX_TX_BUFFER_SIZE 1024
#define CHAT_BOX_STORE_SIZE 4096
#define TEXT_INPUT_STORE_SIZE 256
#define MSG_PREVIEW_SIZE 32
#define KEY_HEX_STR_SIZE ((KEY_BITS / 8) * 3)
typedef struct {
SceneManager* scene_manager;
ViewDispatcher* view_dispatcher;
NotificationApp* notification;
// UI elements
Menu* menu;
TextBox* chat_box;
FuriString* chat_box_store;
TextInput* text_input;
char text_input_store[TEXT_INPUT_STORE_SIZE + 1];
ByteInput* hex_key_input;
uint8_t hex_key_input_store[KEY_BITS / 8];
DialogEx* key_display;
char key_hex_str[KEY_HEX_STR_SIZE + 1];
Popup* nfc_popup;
// for Sub-GHz
uint32_t frequency;
SubGhzTxRxWorker* subghz_worker;
const SubGhzDevice* subghz_device;
// for NFC
NfcWorker* nfc_worker;
NfcDeviceData* nfc_dev_data;
// message assembly before TX
FuriString* name_prefix;
FuriString* msg_input;
// message preview
char msg_preview[MSG_PREVIEW_SIZE + 1];
// encryption
bool encrypted;
ESubGhzChatCryptoCtx* crypto_ctx;
// RX and TX buffers
uint8_t rx_buffer[RX_TX_BUFFER_SIZE];
uint8_t tx_buffer[RX_TX_BUFFER_SIZE];
char rx_str_buffer[RX_TX_BUFFER_SIZE + 1];
volatile uint32_t last_time_rx_data;
// for locking
ViewPortDrawCallback orig_draw_cb;
ViewPortInputCallback orig_input_cb;
bool kbd_locked;
uint32_t kbd_lock_msg_ticks;
uint8_t kbd_lock_count;
// for ongoing inputs
bool kbd_ok_input_ongoing;
bool kbd_left_input_ongoing;
bool kbd_right_input_ongoing;
} ESubGhzChatState;
typedef enum {
ESubGhzChatEvent_FreqEntered,
ESubGhzChatEvent_KeyMenuNoEncryption,
ESubGhzChatEvent_KeyMenuPassword,
ESubGhzChatEvent_KeyMenuHexKey,
ESubGhzChatEvent_KeyMenuGenKey,
ESubGhzChatEvent_KeyMenuReadKeyFromNfc,
ESubGhzChatEvent_KeyReadPopupFailed,
ESubGhzChatEvent_KeyReadPopupSucceeded,
ESubGhzChatEvent_PassEntered,
ESubGhzChatEvent_HexKeyEntered,
ESubGhzChatEvent_MsgEntered,
ESubGhzChatEvent_GotoMsgInput,
ESubGhzChatEvent_GotoKeyDisplay,
ESubGhzChatEvent_KeyDisplayBack,
ESubGhzChatEvent_KeyDisplayShare,
} ESubGhzChatEvent;
typedef enum {
ESubGhzChatView_Menu,
ESubGhzChatView_Input,
ESubGhzChatView_HexKeyInput,
ESubGhzChatView_ChatBox,
ESubGhzChatView_KeyDisplay,
ESubGhzChatView_NfcPopup,
} ESubGhzChatView;
void set_chat_input_header(ESubGhzChatState* state);
void append_msg(ESubGhzChatState* state, const char* msg);
void tx_msg_input(ESubGhzChatState* state);
void enter_chat(ESubGhzChatState* state);

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applications/external/esubghz_chat/scenes/esubghz_chat_chat_box.c vendored Normal file
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#include "../esubghz_chat_i.h"
/* Prepares the text box scene. */
void scene_on_enter_chat_box(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_chat_box");
furi_assert(context);
ESubGhzChatState* state = context;
text_box_reset(state->chat_box);
text_box_set_text(state->chat_box,
furi_string_get_cstr(state->chat_box_store));
text_box_set_focus(state->chat_box, TextBoxFocusEnd);
view_dispatcher_switch_to_view(state->view_dispatcher, ESubGhzChatView_ChatBox);
}
/* Handles scene manager events for the text box scene. */
bool scene_on_event_chat_box(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_chat_box");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to message input scene */
case ESubGhzChatEvent_GotoMsgInput:
if (!scene_manager_previous_scene(
state->scene_manager)) {
view_dispatcher_stop(state->view_dispatcher);
}
consumed = true;
break;
case ESubGhzChatEvent_GotoKeyDisplay:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_KeyDisplay);
consumed = true;
break;
}
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the text box scene. */
void scene_on_exit_chat_box(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_chat_box");
furi_assert(context);
ESubGhzChatState* state = context;
text_box_reset(state->chat_box);
}

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applications/external/esubghz_chat/scenes/esubghz_chat_chat_input.c vendored Normal file
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#include "../esubghz_chat_i.h"
/* If no message was entred this simply emits a MsgEntered event to the scene
* manager to switch to the text box. If a message was entered it is appended
* to the name string. The result is encrypted, if encryption is enabled, and
* then copied into the TX buffer. The contents of the TX buffer are then
* transmitted. The sent message is appended to the text box and a MsgEntered
* event is sent to the scene manager to switch to the text box view. */
static bool chat_input_validator(const char *text, FuriString *error,
void *context)
{
UNUSED(error);
furi_assert(context);
ESubGhzChatState* state = context;
/* no message, just switch to the text box view */
if (strlen(text) == 0) {
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_MsgEntered);
return true;
}
/* concatenate the name prefix and the actual message */
furi_string_set(state->msg_input, state->name_prefix);
furi_string_cat_str(state->msg_input, ": ");
furi_string_cat_str(state->msg_input, text);
/* append the message to the chat box and prepare message preview */
append_msg(state, furi_string_get_cstr(state->msg_input));
/* encrypt and transmit message */
tx_msg_input(state);
/* clear message input buffer */
furi_string_set_char(state->msg_input, 0, 0);
/* switch to text box view */
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_MsgEntered);
return true;
}
/* Prepares the message input scene. */
void scene_on_enter_chat_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_chat_input");
furi_assert(context);
ESubGhzChatState* state = context;
state->text_input_store[0] = 0;
text_input_reset(state->text_input);
/* use validator for scene change to get around minimum length
* requirement */
text_input_set_result_callback(
state->text_input,
NULL,
NULL,
state->text_input_store,
sizeof(state->text_input_store),
true);
text_input_set_validator(
state->text_input,
chat_input_validator,
state);
set_chat_input_header(state);
view_dispatcher_switch_to_view(state->view_dispatcher, ESubGhzChatView_Input);
}
/* Handles scene manager events for the message input scene. */
bool scene_on_event_chat_input(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_chat_input");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to text box scene */
case ESubGhzChatEvent_MsgEntered:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_ChatBox);
consumed = true;
break;
}
break;
case SceneManagerEventTypeBack:
/* stop the application if the user presses back here */
view_dispatcher_stop(state->view_dispatcher);
consumed = true;
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the password input scene. */
void scene_on_exit_chat_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_chat_input");
furi_assert(context);
ESubGhzChatState* state = context;
text_input_reset(state->text_input);
}

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applications/external/esubghz_chat/scenes/esubghz_chat_freq_input.c vendored Normal file
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#include "../esubghz_chat_i.h"
/* Sends FreqEntered event to scene manager and displays the frequency in the
* text box. */
static void freq_input_cb(void *context)
{
furi_assert(context);
ESubGhzChatState* state = context;
furi_string_cat_printf(state->chat_box_store, "Frequency: %lu",
state->frequency);
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_FreqEntered);
}
/* Validates the entered frequency. */
static bool freq_input_validator(const char *text, FuriString *error,
void *context)
{
furi_assert(text);
furi_assert(error);
furi_assert(context);
ESubGhzChatState* state = context;
int ret = sscanf(text, "%lu", &(state->frequency));
if (ret != 1) {
furi_string_printf(error, "Please enter\nfrequency\nin Hz!");
return false;
}
if (!subghz_devices_is_frequency_valid(state->subghz_device,
state->frequency)) {
furi_string_printf(error, "Frequency\n%lu\n is invalid!",
state->frequency);
return false;
}
#ifdef FW_ORIGIN_Official
if (!furi_hal_region_is_frequency_allowed(state->frequency)) {
#else /* FW_ORIGIN_Official */
if (!furi_hal_subghz_is_tx_allowed(state->frequency)) {
#endif /* FW_ORIGIN_Official */
furi_string_printf(error, "TX forbidden\non frequency\n%lu!",
state->frequency);
return false;
}
return true;
}
/* Prepares the frequency input scene. */
void scene_on_enter_freq_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_freq_input");
furi_assert(context);
ESubGhzChatState* state = context;
snprintf(state->text_input_store, TEXT_INPUT_STORE_SIZE, "%lu",
(uint32_t) DEFAULT_FREQ);
text_input_reset(state->text_input);
text_input_set_result_callback(
state->text_input,
freq_input_cb,
state,
state->text_input_store,
sizeof(state->text_input_store),
true);
text_input_set_validator(
state->text_input,
freq_input_validator,
state);
text_input_set_header_text(
state->text_input,
"Frequency");
view_dispatcher_switch_to_view(state->view_dispatcher, ESubGhzChatView_Input);
}
/* Handles scene manager events for the frequency input scene. */
bool scene_on_event_freq_input(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_freq_input");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to password input scene */
case ESubGhzChatEvent_FreqEntered:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_KeyMenu);
consumed = true;
break;
}
break;
case SceneManagerEventTypeBack:
/* stop the application if the user presses back here */
view_dispatcher_stop(state->view_dispatcher);
consumed = true;
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the frequency input scene. */
void scene_on_exit_freq_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_freq_input");
furi_assert(context);
ESubGhzChatState* state = context;
text_input_reset(state->text_input);
}

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applications/external/esubghz_chat/scenes/esubghz_chat_hex_key_input.c vendored Normal file
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#include "../esubghz_chat_i.h"
/* Sets the entered bytes as the key, enters the chat and sends a HexKeyEntered
* event to the scene manager. */
static void hex_key_input_cb(void* context)
{
furi_assert(context);
ESubGhzChatState* state = context;
/* initiate the crypto context */
bool ret = crypto_ctx_set_key(state->crypto_ctx,
state->hex_key_input_store, state->name_prefix,
furi_get_tick());
/* cleanup */
crypto_explicit_bzero(state->hex_key_input_store,
sizeof(state->hex_key_input_store));
if (!ret) {
crypto_ctx_clear(state->crypto_ctx);
return;
}
state->encrypted = true;
enter_chat(state);
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_HexKeyEntered);
}
/* Prepares the hex key input scene. */
void scene_on_enter_hex_key_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_hex_key_input");
furi_assert(context);
ESubGhzChatState* state = context;
byte_input_set_result_callback(state->hex_key_input,
hex_key_input_cb,
NULL,
state,
state->hex_key_input_store,
sizeof(state->hex_key_input_store));
view_dispatcher_switch_to_view(state->view_dispatcher,
ESubGhzChatView_HexKeyInput);
}
/* Handles scene manager events for the hex key input scene. */
bool scene_on_event_hex_key_input(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_hex_key_input");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to message input scene */
case ESubGhzChatEvent_HexKeyEntered:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_ChatInput);
consumed = true;
break;
}
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the hex key input scene. */
void scene_on_exit_hex_key_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_hex_key_input");
furi_assert(context);
ESubGhzChatState* state = context;
crypto_explicit_bzero(state->hex_key_input_store,
sizeof(state->hex_key_input_store));
}

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applications/external/esubghz_chat/scenes/esubghz_chat_key_display.c vendored Normal file
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#include "../esubghz_chat_i.h"
void key_display_result_cb(DialogExResult result, void* context)
{
furi_assert(context);
ESubGhzChatState* state = context;
switch(result) {
case DialogExResultLeft:
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyDisplayBack);
break;
case DialogExResultCenter:
if (state->encrypted) {
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyDisplayShare);
}
break;
default:
break;
}
}
/* Prepares the key display scene. */
void scene_on_enter_key_display(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_key_display");
furi_assert(context);
ESubGhzChatState* state = context;
if (state->encrypted) {
uint8_t key[KEY_BITS / 8];
crypto_ctx_get_key(state->crypto_ctx, key);
snprintf(state->key_hex_str, KEY_HEX_STR_SIZE,
"%02hX%02hX%02hX%02hX"
"%02hX%02hX%02hX%02hX\n"
"%02hX%02hX%02hX%02hX"
"%02hX%02hX%02hX%02hX\n"
"%02hX%02hX%02hX%02hX"
"%02hX%02hX%02hX%02hX\n"
"%02hX%02hX%02hX%02hX"
"%02hX%02hX%02hX%02hX",
key[0], key[1], key[2], key[3],
key[4], key[5], key[6], key[7],
key[8], key[9], key[10], key[11],
key[12], key[13], key[14], key[15],
key[16], key[17], key[18], key[19],
key[20], key[21], key[22], key[23],
key[24], key[25], key[26], key[27],
key[28], key[29], key[30], key[31]);
crypto_explicit_bzero(key, sizeof(key));
} else {
strcpy(state->key_hex_str, "No Key");
}
dialog_ex_reset(state->key_display);
dialog_ex_set_text(state->key_display, state->key_hex_str, 64, 2,
AlignCenter, AlignTop);
dialog_ex_set_icon(state->key_display, 0, 0, NULL);
dialog_ex_set_left_button_text(state->key_display, "Back");
if (state->encrypted) {
dialog_ex_set_center_button_text(state->key_display, "Share");
}
dialog_ex_set_result_callback(state->key_display,
key_display_result_cb);
dialog_ex_set_context(state->key_display, state);
view_dispatcher_switch_to_view(state->view_dispatcher, ESubGhzChatView_KeyDisplay);
}
/* Handles scene manager events for the key display scene. */
bool scene_on_event_key_display(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_key_display");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to message input scene */
case ESubGhzChatEvent_KeyDisplayBack:
if (!scene_manager_previous_scene(
state->scene_manager)) {
view_dispatcher_stop(state->view_dispatcher);
}
consumed = true;
break;
/* open key sharing popup */
case ESubGhzChatEvent_KeyDisplayShare:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_KeySharePopup);
consumed = true;
break;
}
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the key display scene. */
void scene_on_exit_key_display(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_key_display");
furi_assert(context);
ESubGhzChatState* state = context;
dialog_ex_reset(state->key_display);
crypto_explicit_bzero(state->key_hex_str, sizeof(state->key_hex_str));
}

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applications/external/esubghz_chat/scenes/esubghz_chat_key_menu.c vendored Normal file
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#include "../esubghz_chat_i.h"
typedef enum {
ESubGhzChatKeyMenuItems_NoEncryption,
ESubGhzChatKeyMenuItems_Password,
ESubGhzChatKeyMenuItems_HexKey,
ESubGhzChatKeyMenuItems_GenKey,
ESubGhzChatKeyMenuItems_ReadKeyFromNfc,
} ESubGhzChatKeyMenuItems;
static void key_menu_cb(void* context, uint32_t index)
{
furi_assert(context);
ESubGhzChatState* state = context;
uint8_t key[KEY_BITS / 8];
switch(index) {
case ESubGhzChatKeyMenuItems_NoEncryption:
state->encrypted = false;
enter_chat(state);
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyMenuNoEncryption);
break;
case ESubGhzChatKeyMenuItems_Password:
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyMenuPassword);
break;
case ESubGhzChatKeyMenuItems_HexKey:
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyMenuHexKey);
break;
case ESubGhzChatKeyMenuItems_GenKey:
/* generate a random key */
furi_hal_random_fill_buf(key, KEY_BITS / 8);
/* initiate the crypto context */
bool ret = crypto_ctx_set_key(state->crypto_ctx, key,
state->name_prefix, furi_get_tick());
/* cleanup */
crypto_explicit_bzero(key, sizeof(key));
if (!ret) {
crypto_ctx_clear(state->crypto_ctx);
return;
}
/* set encrypted flag and enter the chat */
state->encrypted = true;
enter_chat(state);
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyMenuGenKey);
break;
case ESubGhzChatKeyMenuItems_ReadKeyFromNfc:
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyMenuReadKeyFromNfc);
break;
default:
break;
}
}
/* Prepares the key menu scene. */
void scene_on_enter_key_menu(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_key_menu");
furi_assert(context);
ESubGhzChatState* state = context;
menu_reset(state->menu);
menu_add_item(
state->menu,
"No encryption",
NULL,
ESubGhzChatKeyMenuItems_NoEncryption,
key_menu_cb,
state
);
menu_add_item(
state->menu,
"Password",
NULL,
ESubGhzChatKeyMenuItems_Password,
key_menu_cb,
state
);
menu_add_item(
state->menu,
"Hex Key",
NULL,
ESubGhzChatKeyMenuItems_HexKey,
key_menu_cb,
state
);
menu_add_item(
state->menu,
"Generate Key",
NULL,
ESubGhzChatKeyMenuItems_GenKey,
key_menu_cb,
state
);
menu_add_item(
state->menu,
"Read Key from NFC",
NULL,
ESubGhzChatKeyMenuItems_ReadKeyFromNfc,
key_menu_cb,
state
);
view_dispatcher_switch_to_view(state->view_dispatcher, ESubGhzChatView_Menu);
}
/* Handles scene manager events for the key menu scene. */
bool scene_on_event_key_menu(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_key_menu");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to message input scene */
case ESubGhzChatEvent_KeyMenuNoEncryption:
case ESubGhzChatEvent_KeyMenuGenKey:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_ChatInput);
consumed = true;
break;
/* switch to password input scene */
case ESubGhzChatEvent_KeyMenuPassword:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_PassInput);
consumed = true;
break;
/* switch to hex key input scene */
case ESubGhzChatEvent_KeyMenuHexKey:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_HexKeyInput);
consumed = true;
break;
/* switch to hex key read scene */
case ESubGhzChatEvent_KeyMenuReadKeyFromNfc:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_KeyReadPopup);
consumed = true;
break;
}
break;
case SceneManagerEventTypeBack:
/* stop the application if the user presses back here */
view_dispatcher_stop(state->view_dispatcher);
consumed = true;
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the key menu scene. */
void scene_on_exit_key_menu(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_key_menu");
furi_assert(context);
ESubGhzChatState* state = context;
menu_reset(state->menu);
}

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applications/external/esubghz_chat/scenes/esubghz_chat_key_read_popup.c vendored Normal file
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#include "../esubghz_chat_i.h"
typedef enum {
KeyReadPopupState_Idle,
KeyReadPopupState_Detecting,
KeyReadPopupState_Reading,
KeyReadPopupState_Fail,
KeyReadPopupState_Success,
} KeyReadPopupState;
static bool read_worker_cb(NfcWorkerEvent event, void* context)
{
furi_assert(context);
ESubGhzChatState* state = context;
view_dispatcher_send_custom_event(state->view_dispatcher, event);
return true;
}
static void key_read_popup_timeout_cb(void* context)
{
furi_assert(context);
ESubGhzChatState* state = context;
uint32_t cur_state = scene_manager_get_scene_state(
state->scene_manager, ESubGhzChatScene_KeyReadPopup);
/* done displaying our failure */
if (cur_state == KeyReadPopupState_Fail) {
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyReadPopupFailed);
/* done displaying our success, enter chat */
} else if (cur_state == KeyReadPopupState_Success) {
enter_chat(state);
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_KeyReadPopupSucceeded);
}
}
static bool key_read_popup_handle_key_read(ESubGhzChatState *state)
{
NfcDeviceData *dev_data = state->nfc_dev_data;
if (dev_data->mf_ul_data.data_read < KEY_BITS / 8) {
return false;
}
/* initiate the crypto context */
bool ret = crypto_ctx_set_key(state->crypto_ctx,
dev_data->mf_ul_data.data, state->name_prefix,
furi_get_tick());
/* cleanup */
crypto_explicit_bzero(dev_data->mf_ul_data.data, KEY_BITS / 8);
if (!ret) {
crypto_ctx_clear(state->crypto_ctx);
return false;
}
/* set encrypted flag */
state->encrypted = true;
return true;
}
static void key_read_popup_set_state(ESubGhzChatState *state, KeyReadPopupState
new_state)
{
uint32_t cur_state = scene_manager_get_scene_state(
state->scene_manager, ESubGhzChatScene_KeyReadPopup);
if (cur_state == new_state) {
return;
}
if (new_state == KeyReadPopupState_Detecting) {
popup_reset(state->nfc_popup);
popup_disable_timeout(state->nfc_popup);
popup_set_text(state->nfc_popup, "Tap Flipper\n to sender", 97,
24, AlignCenter, AlignTop);
popup_set_icon(state->nfc_popup, 0, 8, &I_NFC_manual_60x50);
notification_message(state->notification,
&sequence_blink_start_cyan);
} else if (new_state == KeyReadPopupState_Reading) {
popup_reset(state->nfc_popup);
popup_disable_timeout(state->nfc_popup);
popup_set_header(state->nfc_popup, "Reading key\nDon't "
"move...", 85, 24, AlignCenter, AlignTop);
popup_set_icon(state->nfc_popup, 12, 23, &I_Loading_24);
notification_message(state->notification,
&sequence_blink_start_yellow);
} else if (new_state == KeyReadPopupState_Fail) {
nfc_worker_stop(state->nfc_worker);
popup_reset(state->nfc_popup);
popup_set_header(state->nfc_popup, "Failure!", 64, 2,
AlignCenter, AlignTop);
popup_set_text(state->nfc_popup, "Failed\nto read\nkey.", 78,
16, AlignLeft, AlignTop);
popup_set_icon(state->nfc_popup, 21, 13, &I_Cry_dolph_55x52);
popup_set_timeout(state->nfc_popup, KEY_READ_POPUP_MS);
popup_set_context(state->nfc_popup, state);
popup_set_callback(state->nfc_popup,
key_read_popup_timeout_cb);
popup_enable_timeout(state->nfc_popup);
notification_message(state->notification,
&sequence_blink_stop);
} else if (new_state == KeyReadPopupState_Success) {
nfc_worker_stop(state->nfc_worker);
popup_reset(state->nfc_popup);
popup_set_header(state->nfc_popup, "Key\nread!", 13, 22,
AlignLeft, AlignBottom);
popup_set_icon(state->nfc_popup, 32, 5, &I_DolphinNice_96x59);
popup_set_timeout(state->nfc_popup, KEY_READ_POPUP_MS);
popup_set_context(state->nfc_popup, state);
popup_set_callback(state->nfc_popup,
key_read_popup_timeout_cb);
popup_enable_timeout(state->nfc_popup);
notification_message(state->notification, &sequence_success);
notification_message(state->notification,
&sequence_blink_stop);
}
scene_manager_set_scene_state(state->scene_manager,
ESubGhzChatScene_KeyReadPopup, new_state);
view_dispatcher_switch_to_view(state->view_dispatcher,
ESubGhzChatView_NfcPopup);
}
/* Prepares the key share read scene. */
void scene_on_enter_key_read_popup(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_key_read_popup");
furi_assert(context);
ESubGhzChatState* state = context;
key_read_popup_set_state(state, KeyReadPopupState_Detecting);
state->nfc_dev_data->parsed_data = furi_string_alloc();
if (state->nfc_dev_data->parsed_data == NULL) {
/* can't do anything here, crash */
furi_check(0);
}
nfc_worker_start(state->nfc_worker, NfcWorkerStateRead,
state->nfc_dev_data, read_worker_cb, state);
}
/* Handles scene manager events for the key read popup scene. */
bool scene_on_event_key_read_popup(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_key_read_popup");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* card detected */
case NfcWorkerEventCardDetected:
key_read_popup_set_state(state,
KeyReadPopupState_Reading);
consumed = true;
break;
/* no card detected */
case NfcWorkerEventNoCardDetected:
key_read_popup_set_state(state,
KeyReadPopupState_Detecting);
consumed = true;
break;
/* key probably read */
case NfcWorkerEventReadMfUltralight:
if (key_read_popup_handle_key_read(state)) {
key_read_popup_set_state(state,
KeyReadPopupState_Success);
} else {
key_read_popup_set_state(state,
KeyReadPopupState_Fail);
}
consumed = true;
break;
/* close the popup and go back */
case ESubGhzChatEvent_KeyReadPopupFailed:
if (!scene_manager_previous_scene(
state->scene_manager)) {
view_dispatcher_stop(state->view_dispatcher);
}
consumed = true;
break;
/* success, go to chat input */
case ESubGhzChatEvent_KeyReadPopupSucceeded:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_ChatInput);
consumed = true;
break;
/* something else happend, treat as failure */
default:
key_read_popup_set_state(state,
KeyReadPopupState_Fail);
consumed = true;
break;
}
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the key read popup scene. */
void scene_on_exit_key_read_popup(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_key_read_popup");
furi_assert(context);
ESubGhzChatState* state = context;
popup_reset(state->nfc_popup);
scene_manager_set_scene_state(state->scene_manager,
ESubGhzChatScene_KeyReadPopup, KeyReadPopupState_Idle);
notification_message(state->notification, &sequence_blink_stop);
nfc_worker_stop(state->nfc_worker);
crypto_explicit_bzero(state->nfc_dev_data->mf_ul_data.data, KEY_BITS / 8);
if (state->nfc_dev_data->parsed_data != NULL) {
furi_string_free(state->nfc_dev_data->parsed_data);
}
memset(state->nfc_dev_data, 0, sizeof(NfcDeviceData));
}

88
applications/external/esubghz_chat/scenes/esubghz_chat_key_share_popup.c vendored Normal file
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#include "../esubghz_chat_i.h"
static void prepare_nfc_dev_data(ESubGhzChatState *state)
{
NfcDeviceData *dev_data = state->nfc_dev_data;
dev_data->protocol = NfcDeviceProtocolMifareUl;
furi_hal_random_fill_buf(dev_data->nfc_data.uid, 7);
dev_data->nfc_data.uid_len = 7;
dev_data->nfc_data.atqa[0] = 0x44;
dev_data->nfc_data.atqa[1] = 0x00;
dev_data->nfc_data.sak = 0x00;
dev_data->mf_ul_data.type = MfUltralightTypeNTAG215;
dev_data->mf_ul_data.version.header = 0x00;
dev_data->mf_ul_data.version.vendor_id = 0x04;
dev_data->mf_ul_data.version.prod_type = 0x04;
dev_data->mf_ul_data.version.prod_subtype = 0x02;
dev_data->mf_ul_data.version.prod_ver_major = 0x01;
dev_data->mf_ul_data.version.prod_ver_minor = 0x00;
dev_data->mf_ul_data.version.storage_size = 0x11;
dev_data->mf_ul_data.version.protocol_type = 0x03;
/* Add 16 to the size for config pages */
dev_data->mf_ul_data.data_size = (KEY_BITS / 8) + 16;
crypto_ctx_get_key(state->crypto_ctx, dev_data->mf_ul_data.data);
}
/* Prepares the key share popup scene. */
void scene_on_enter_key_share_popup(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_key_share_popup");
furi_assert(context);
ESubGhzChatState* state = context;
popup_reset(state->nfc_popup);
popup_disable_timeout(state->nfc_popup);
popup_set_header(state->nfc_popup, "Sharing...", 67, 13, AlignLeft,
AlignTop);
popup_set_icon(state->nfc_popup, 0, 3, &I_NFC_dolphin_emulation_47x61);
popup_set_text(state->nfc_popup, "Sharing\nKey via\nNFC", 90, 28,
AlignCenter, AlignTop);
prepare_nfc_dev_data(state);
nfc_worker_start(state->nfc_worker, NfcWorkerStateMfUltralightEmulate,
state->nfc_dev_data, NULL, NULL);
notification_message(state->notification,
&sequence_blink_start_magenta);
view_dispatcher_switch_to_view(state->view_dispatcher,
ESubGhzChatView_NfcPopup);
}
/* Handles scene manager events for the key share popup scene. */
bool scene_on_event_key_share_popup(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_key_share_popup");
furi_assert(context);
ESubGhzChatState* state = context;
UNUSED(state);
UNUSED(event);
return false;
}
/* Cleans up the key share popup scene. */
void scene_on_exit_key_share_popup(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_key_share_popup");
furi_assert(context);
ESubGhzChatState* state = context;
popup_reset(state->nfc_popup);
notification_message(state->notification, &sequence_blink_stop);
nfc_worker_stop(state->nfc_worker);
crypto_explicit_bzero(state->nfc_dev_data->mf_ul_data.data, KEY_BITS / 8);
memset(state->nfc_dev_data, 0, sizeof(NfcDeviceData));
}

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applications/external/esubghz_chat/scenes/esubghz_chat_pass_input.c vendored Normal file
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#include "../esubghz_chat_i.h"
/* Sends PassEntered event to scene manager and enters the chat. */
static void pass_input_cb(void *context)
{
furi_assert(context);
ESubGhzChatState* state = context;
crypto_explicit_bzero(state->text_input_store,
sizeof(state->text_input_store));
enter_chat(state);
view_dispatcher_send_custom_event(state->view_dispatcher,
ESubGhzChatEvent_PassEntered);
}
/* If a password was entered this derives a key from the password using a
* single pass of SHA256 and initiates the AES-GCM context for encryption. If
* the initiation fails, the password is rejected. */
static bool pass_input_validator(const char *text, FuriString *error,
void *context)
{
furi_assert(text);
furi_assert(error);
furi_assert(context);
ESubGhzChatState* state = context;
if (strlen(text) == 0) {
furi_string_printf(error, "Enter a\npassword!");
return false;
}
unsigned char key[KEY_BITS / 8];
/* derive a key from the password */
sha256((unsigned char *) text, strlen(text), key);
/* initiate the crypto context */
bool ret = crypto_ctx_set_key(state->crypto_ctx, key,
state->name_prefix, furi_get_tick());
/* cleanup */
crypto_explicit_bzero(key, sizeof(key));
if (!ret) {
crypto_ctx_clear(state->crypto_ctx);
furi_string_printf(error, "Failed to\nset key!");
return false;
}
state->encrypted = true;
return true;
}
/* Prepares the password input scene. */
void scene_on_enter_pass_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_enter_pass_input");
furi_assert(context);
ESubGhzChatState* state = context;
state->text_input_store[0] = 0;
text_input_reset(state->text_input);
text_input_set_result_callback(
state->text_input,
pass_input_cb,
state,
state->text_input_store,
sizeof(state->text_input_store),
true);
text_input_set_validator(
state->text_input,
pass_input_validator,
state);
text_input_set_header_text(
state->text_input,
"Password");
view_dispatcher_switch_to_view(state->view_dispatcher, ESubGhzChatView_Input);
}
/* Handles scene manager events for the password input scene. */
bool scene_on_event_pass_input(void* context, SceneManagerEvent event)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_event_pass_input");
furi_assert(context);
ESubGhzChatState* state = context;
bool consumed = false;
switch(event.type) {
case SceneManagerEventTypeCustom:
switch(event.event) {
/* switch to message input scene */
case ESubGhzChatEvent_PassEntered:
scene_manager_next_scene(state->scene_manager,
ESubGhzChatScene_ChatInput);
consumed = true;
break;
}
break;
default:
consumed = false;
break;
}
return consumed;
}
/* Cleans up the password input scene. */
void scene_on_exit_pass_input(void* context)
{
FURI_LOG_T(APPLICATION_NAME, "scene_on_exit_pass_input");
furi_assert(context);
ESubGhzChatState* state = context;
text_input_reset(state->text_input);
crypto_explicit_bzero(state->text_input_store,
sizeof(state->text_input_store));
}

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applications/external/esubghz_chat/scenes/esubghz_chat_scene.c vendored Normal file
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#include "esubghz_chat_scene.h"
// Generate scene on_enter handlers array
#define ADD_SCENE(prefix, name, id) scene_on_enter_##name,
void (*const esubghz_chat_scene_on_enter_handlers[])(void*) = {
#include "esubghz_chat_scene_config.h"
};
#undef ADD_SCENE
// Generate scene on_event handlers array
#define ADD_SCENE(prefix, name, id) scene_on_event_##name,
bool (*const esubghz_chat_scene_on_event_handlers[])(void* context, SceneManagerEvent event) = {
#include "esubghz_chat_scene_config.h"
};
#undef ADD_SCENE
// Generate scene on_exit handlers array
#define ADD_SCENE(prefix, name, id) scene_on_exit_##name,
void (*const esubghz_chat_scene_on_exit_handlers[])(void* context) = {
#include "esubghz_chat_scene_config.h"
};
#undef ADD_SCENE
// Initialize scene handlers configuration structure
const SceneManagerHandlers esubghz_chat_scene_event_handlers = {
.on_enter_handlers = esubghz_chat_scene_on_enter_handlers,
.on_event_handlers = esubghz_chat_scene_on_event_handlers,
.on_exit_handlers = esubghz_chat_scene_on_exit_handlers,
.scene_num = ESubGhzChatScene_MAX,
};

29
applications/external/esubghz_chat/scenes/esubghz_chat_scene.h vendored Normal file
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#pragma once
#include <gui/scene_manager.h>
// Generate scene id and total number
#define ADD_SCENE(prefix, name, id) ESubGhzChatScene_##id,
typedef enum {
#include "esubghz_chat_scene_config.h"
ESubGhzChatScene_MAX
} ESubGhzChatScene;
#undef ADD_SCENE
extern const SceneManagerHandlers esubghz_chat_scene_event_handlers;
// Generate scene on_enter handlers declaration
#define ADD_SCENE(prefix, name, id) void scene_on_enter_##name(void*);
#include "esubghz_chat_scene_config.h"
#undef ADD_SCENE
// Generate scene on_event handlers declaration
#define ADD_SCENE(prefix, name, id) \
bool scene_on_event_##name(void* context, SceneManagerEvent event);
#include "esubghz_chat_scene_config.h"
#undef ADD_SCENE
// Generate scene on_exit handlers declaration
#define ADD_SCENE(prefix, name, id) void scene_on_exit_##name(void* context);
#include "esubghz_chat_scene_config.h"
#undef ADD_SCENE

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applications/external/esubghz_chat/scenes/esubghz_chat_scene_config.h vendored Normal file
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ADD_SCENE(esubghz_chat, freq_input, FreqInput)
ADD_SCENE(esubghz_chat, key_menu, KeyMenu)
ADD_SCENE(esubghz_chat, pass_input, PassInput)
ADD_SCENE(esubghz_chat, hex_key_input, HexKeyInput)
ADD_SCENE(esubghz_chat, key_read_popup, KeyReadPopup)
ADD_SCENE(esubghz_chat, chat_input, ChatInput)
ADD_SCENE(esubghz_chat, chat_box, ChatBox)
ADD_SCENE(esubghz_chat, key_display, KeyDisplay)
ADD_SCENE(esubghz_chat, key_share_popup, KeySharePopup)