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Added mykey (#467)

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WillyJL
2023-11-28 00:28:51 +00:00
committed by GitHub
parent 4f8e80b0a4 2340efe7e9
commit 3ae1eee4c8
3 changed files with 102 additions and 5 deletions
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48
applications/main/nfc/helpers/protocol_support/st25tb/mykey.c Normal file
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#include "mykey.h"
uint32_t encode_decode_block(uint32_t input) {
/*
* Swap all values using XOR
* 32 bit: 1111222233334444
*/
input ^= (input & 0x00C00000) << 6 | (input & 0x0000C000) << 12 | (input & 0x000000C0) << 18 |
(input & 0x000C0000) >> 6 | (input & 0x00030000) >> 12 | (input & 0x00000300) >> 6;
input ^= (input & 0x30000000) >> 6 | (input & 0x0C000000) >> 12 | (input & 0x03000000) >> 18 |
(input & 0x00003000) << 6 | (input & 0x00000030) << 12 | (input & 0x0000000C) << 6;
input ^= (input & 0x00C00000) << 6 | (input & 0x0000C000) << 12 | (input & 0x000000C0) << 18 |
(input & 0x000C0000) >> 6 | (input & 0x00030000) >> 12 | (input & 0x00000300) >> 6;
return input;
}
void endian_swap_uint8_array(uint8_t *array, size_t size) {
size_t i;
uint8_t temp;
for (i = 0; i < size / 2; i++) {
temp = array[i];
array[i] = array[size - 1 - i];
array[size - 1 - i] = temp;
}
}
/* Bytewise LITTLE ENDIAN */
uint32_t st25tb_get_block_value(uint32_t block) {
uint8_t byte0 = (block >> 24) & 0xFF;
uint8_t byte1 = (block >> 16) & 0xFF;
uint8_t byte2 = (block >> 8) & 0xFF;
uint8_t byte3 = block & 0xFF;
return (byte3 << 24) | (byte2 << 16) | (byte1 << 8) | byte0;
}
//Ottengo il blocco effetto un bytewise e lo decodo
uint32_t get_block(uint32_t block) {
return encode_decode_block(st25tb_get_block_value(block));
}
//decode for credit
uint32_t get_xored_block(uint32_t block, uint32_t key) {
return encode_decode_block(st25tb_get_block_value(block) ^ key);
}

31
applications/main/nfc/helpers/protocol_support/st25tb/mykey.h Normal file
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#pragma once
#include <nfc/protocols/st25tb/st25tb.h>
enum {
MYKEY_BLOCK_KEY_ID = 0x07,
MYKEY_BLOCK_PRODUCTION_DATE = 0x08,
MYKEY_BLOCK_VENDOR_ID_1 = 0x18,
MYKEY_BLOCK_VENDOR_ID_2 = 0x19,
MYKEY_BLOCK_CURRENT_CREDIT = 0x21,
MYKEY_BLOCK_PREVIOUS_CREDIT = 0x23,
MYKEY_DEFAULT_VENDOR_ID = 0xFEDC0123,
MYKEY_DEFAULT_VENDOR_ID_1 = 0xFEDC,
MYKEY_DEFAULT_VENDOR_ID_2 = 0x0123,
};
typedef enum {
LockIdStatusNone,
LockIdStatusActive,
} LockIdStatus;
#define get_uid(uid) ((uid)[7] | ((uid)[6] << 8) | ((uid)[5] << 16) | ((uid)[4] << 24))
#define new_get_count_down_counter(b6) (~(b6 << 24 | (b6 & 0x0000FF00) << 8 | (b6 & 0x00FF0000) >> 8 | b6 >> 24))
#define get_vendor(b1, b2) (get_block(b1) << 16 | (get_block(b2) & 0x0000FFFF))
#define get_master_key(uid, vendor_id) ((uid) * ((vendor_id) + 1))
#define get_is_bound(vendor_id) ((vendor_id) != MYKEY_DEFAULT_VENDOR_ID)
#define get_encryption_key(master_key, count_down_counter)((master_key) * ((count_down_counter) + 1))
uint32_t encode_decode_block(uint32_t input);
uint32_t st25tb_get_block_value(uint32_t block);
uint32_t get_block(uint32_t block);
uint32_t get_xored_block(uint32_t block, uint32_t key);

28
applications/main/nfc/helpers/protocol_support/st25tb/st25tb_render.c
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@@ -1,22 +1,40 @@
#include "st25tb_render.h"
#include <nfc/protocols/st25tb/st25tb.h>
#include "mykey.h"
void nfc_render_st25tb_info(
const St25tbData* data,
NfcProtocolFormatType format_type,
FuriString* str) {
furi_string_cat_printf(str, "UID");
for(size_t i = 0; i < ST25TB_UID_SIZE; i++) {
furi_string_cat_printf(str, "UID:");
for(size_t i = 0; i < 8; i++) {
furi_string_cat_printf(str, " %02X", data->uid[i]);
}
uint32_t _uid = get_uid(data->uid);
uint32_t _count_down_counter_new = new_get_count_down_counter(st25tb_get_block_value(data->blocks[6]));
uint32_t _vendor_id = get_vendor(data->blocks[MYKEY_BLOCK_VENDOR_ID_1], data->blocks[MYKEY_BLOCK_VENDOR_ID_2]);
uint32_t _master_key = get_master_key(_uid, _vendor_id);
uint32_t _encryption_key = get_encryption_key(_master_key, _count_down_counter_new);
uint16_t credit = get_xored_block(data->blocks[MYKEY_BLOCK_CURRENT_CREDIT], _encryption_key);
uint16_t _previous_credit = get_block(data->blocks[MYKEY_BLOCK_PREVIOUS_CREDIT]);
bool _is_bound = get_is_bound(_vendor_id);
furi_string_cat_printf(str, "\nCurrent Credit: %d.%02d E", credit / 100, credit % 100);
furi_string_cat_printf(str, "\nPrevius Credit: %d.%02d E", _previous_credit / 100, _previous_credit % 100);
furi_string_cat_printf(str, "\nIs Bound: %s \n", _is_bound ? "Yes" : "No");
if(format_type == NfcProtocolFormatTypeFull) {
furi_string_cat_printf(str, "\nSys. OTP: %08lX", data->system_otp_block);
//info data
furi_string_cat_printf(str, "UID: %08lX\n", _uid);
furi_string_cat_printf(str, "ID: %08lX\n", st25tb_get_block_value(data->blocks[7]));
furi_string_cat_printf(str, "\nCounter New: %08lX", _count_down_counter_new);
furi_string_cat_printf(str, "\nVendor ID: %08lX", _vendor_id);
furi_string_cat_printf(str, "\nMaster Key: %08lX", _master_key);
furi_string_cat_printf(str, "\nEncryption Key: %08lX", _encryption_key);
furi_string_cat_printf(str, "\nBlocks:");
for(size_t i = 0; i < st25tb_get_block_count(data->type); i += 2) {
furi_string_cat_printf(
str, "\n %02X %08lX %08lX", i, data->blocks[i], data->blocks[i + 1]);
str, "\n %02X %08lX %08lX", i, st25tb_get_block_value(data->blocks[i]), st25tb_get_block_value(data->blocks[i + 1]));
}
}
}