add picopass emulation

applications/external/picopass/picopass_device.h

@@ -7,6 +7,7 @@
 #include <mbedtls/des.h>
 
 #include "rfal_picopass.h"
+#include "loclass_writer.h"
 #include <optimized_ikeys.h>
 #include <optimized_cipher.h>
 #include "helpers/iclass_elite_dict.h"
@@ -24,6 +25,49 @@
 #define PICOPASS_AIA_BLOCK_INDEX 5
 #define PICOPASS_PACS_CFG_BLOCK_INDEX 6
 
+// Personalization Mode
+#define PICOPASS_FUSE_PERS 0x80
+// Crypt1 // 1+1 (crypt1+crypt0) means secured and keys changable
+#define PICOPASS_FUSE_CRYPT1 0x10
+// Crypt0 // 1+0 means secure and keys locked, 0+1 means not secured, 0+0 means disable auth entirely
+#define PICOPASS_FUSE_CRTPT0 0x08
+#define PICOPASS_FUSE_CRYPT10 (PICOPASS_FUSE_CRYPT1 | PICOPASS_FUSE_CRTPT0)
+// Read Access, 1 meanns anonymous read enabled, 0 means must auth to read applicaion
+#define PICOPASS_FUSE_RA 0x01
+
+// PicoPass command bytes:
+// Low nibble used for command
+// High nibble used for options and checksum (MSB)
+// The only option we care about in 15693 mode is the key
+// which is only used by READCHECK, so for simplicity we
+// don't bother breaking down the command and flags into parts
+// READ: ADDRESS(1) CRC16(2) -> DATA(8) CRC16(2)
+// IDENTIFY: No args -> ASNB(8) CRC16(2)
+#define PICOPASS_CMD_READ_OR_IDENTIFY 0x0C
+// ADDRESS(1) CRC16(2) -> DATA(32) CRC16(2)
+#define PICOPASS_CMD_READ4 0x06
+// ADDRESS(1) DATA(8) SIGN(4)|CRC16(2) -> DATA(8) CRC16(2)
+#define PICOPASS_CMD_UPDATE 0x87
+// ADDRESS(1) -> DATA(8)
+#define PICOPASS_CMD_READCHECK_KD 0x88
+// ADDRESS(1) -> DATA(8)
+#define PICOPASS_CMD_READCHECK_KC 0x18
+// CHALLENGE(4) READERSIGNATURE(4) -> CHIPRESPONSE(4)
+#define PICOPASS_CMD_CHECK 0x05
+// No args -> SOF
+#define PICOPASS_CMD_ACTALL 0x0A
+// No args -> SOF
+#define PICOPASS_CMD_ACT 0x8E
+// ASNB(8)|SERIALNB(8) -> SERIALNB(8) CRC16(2)
+#define PICOPASS_CMD_SELECT 0x81
+// No args -> SERIALNB(8) CRC16(2)
+#define PICOPASS_CMD_DETECT 0x0F
+// No args -> SOF
+#define PICOPASS_CMD_HALT 0x00
+// PAGE(1) CRC16(2) -> BLOCK1(8) CRC16(2)
+#define PICOPASS_CMD_PAGESEL 0x84
+
+#define PICOPASS_APP_FOLDER ANY_PATH("picopass")
 #define PICOPASS_APP_EXTENSION ".picopass"
 #define PICOPASS_APP_SHADOW_EXTENSION ".pas"
 
@@ -49,6 +93,13 @@ typedef enum {
     PicopassDeviceSaveFormatLF,
 } PicopassDeviceSaveFormat;
 
+typedef enum {
+    PicopassEmulatorStateHalt,
+    PicopassEmulatorStateIdle,
+    PicopassEmulatorStateActive,
+    PicopassEmulatorStateSelected,
+} PicopassEmulatorState;
+
 typedef struct {
     bool valid;
     uint8_t bitLength;
@@ -80,6 +131,15 @@ typedef struct {
     IclassEliteDictAttackData iclass_elite_dict_attack_data;
 } PicopassDeviceData;
 
+typedef struct {
+    PicopassEmulatorState state;
+    LoclassState_t cipher_state;
+    uint8_t key_block_num; // in loclass mode used to store csn#
+    bool loclass_mode;
+    bool loclass_got_std_key;
+    LoclassWriter* loclass_writer;
+} PicopassEmulatorCtx;
+
 typedef struct {
     Storage* storage;
     DialogsApp* dialogs;