Add function to brute force partial key

include/em4x70.h

@@ -42,6 +42,9 @@ typedef struct {
     // Used to write new key
     uint8_t crypt_key[12];
 
+    // used for bruteforce the partial key
+    uint16_t start_key;
+
 } em4x70_data_t;
 
 #endif /* EM4X70_H__ */

include/pm3_cmd.h

@@ -484,6 +484,7 @@ typedef struct {
 #define CMD_LF_EM4X70_AUTH                                                0x0263
 #define CMD_LF_EM4X70_WRITEPIN                                            0x0264
 #define CMD_LF_EM4X70_WRITEKEY                                            0x0265
+#define CMD_LF_EM4X70_BRUTE                                               0x0266
 // Sampling configuration for LF reader/sniffer
 #define CMD_LF_SAMPLING_SET_CONFIG                                        0x021D
 #define CMD_LF_FSK_SIMULATE                                               0x021E