+int usage_legic_load(void){
+ PrintAndLog("It loads datasamples from the file `filename` to device memory");
+ PrintAndLog("Usage: hf legic load <file name>");
+ PrintAndLog(" sample: hf legic load filename");
+ return 0;
+}
+
+/*
+ * Output BigBuf and deobfuscate LEGIC RF tag data.
+ * This is based on information given in the talk held
+ * by Henryk Ploetz and Karsten Nohl at 26c3
+ */
+int CmdLegicDecode(const char *Cmd) {
+ int i, k, n;
+ int segment_len = 0;
+ int segment_flag = 0;
+ int stamp_len = 0;
+ int crc = 0;
+ int wrp = 0;
+ int wrc = 0;
+ uint8_t data_buf[1200]; // receiver buffer
+ //char out_string[3076]; // just use big buffer - bad practice
+ char token_type[4];
+
+ // copy data from proxmark into buffer
+ GetFromBigBuf(data_buf,sizeof(data_buf),0);
+ WaitForResponse(CMD_ACK,NULL);
+
+ // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
+ crc = data_buf[4];
+ uint32_t calc_crc = CRC8Legic(data_buf, 4);
+
+ PrintAndLog("\nCDF: System Area");
+
+ PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
+ data_buf[0],
+ data_buf[1],
+ data_buf[2],
+ data_buf[3],
+ data_buf[4],
+ (calc_crc == crc) ? "OK":"Fail"
+ );
+
+ switch (data_buf[5]&0x7f) {
+ case 0x00 ... 0x2f:
+ strncpy(token_type, "IAM",sizeof(token_type));
+ break;
+ case 0x30 ... 0x6f:
+ strcpy(token_type, "SAM");
+ break;
+ case 0x70 ... 0x7f:
+ strcpy(token_type, "GAM");
+ break;
+ default:
+ strcpy(token_type, "???");
+ break;
+ }
+
+ stamp_len = 0xfc - data_buf[6];
+
+ PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
+ data_buf[5],
+ data_buf[6],
+ token_type,
+ (data_buf[5]&0x80)>>7,
+ stamp_len
+ );
+
+ PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
+ data_buf[7]&0x0f,
+ (data_buf[7]&0x70)>>4,
+ (data_buf[7]&0x80)>>7,
+ data_buf[7],
+ data_buf[8]
+ );
+
+ PrintAndLog("Remaining Header Area");
+ PrintAndLog("%s", sprint_hex(data_buf+9, 13));
+ PrintAndLog("\nADF: User Area");
+
+ i = 22;
+ uint8_t segCrcBytes[8] = {0x00};
+ uint32_t segCalcCRC = 0;
+ uint32_t segCRC = 0;
+
+ for ( n=0; n<64; n++ ) {
+ segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
+ segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
+
+ wrp = (data_buf[i+2]^crc);
+ wrc = ((data_buf[i+3]^crc)&0x70)>>4;
+
+ /* validate segment-crc */
+ segCRC = data_buf[i+4]^crc;
+
+ segCrcBytes[0]=data_buf[0]; //uid0
+ segCrcBytes[1]=data_buf[1]; //uid1
+ segCrcBytes[2]=data_buf[2]; //uid2
+ segCrcBytes[3]=data_buf[3]; //uid3
+ segCrcBytes[4]=(data_buf[i]^crc); //hdr0
+ segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
+ segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
+ segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
+ segCalcCRC = CRC8Legic(segCrcBytes, 8);
+
+ PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x (%s)",
+ n,
+ data_buf[i]^crc,
+ data_buf[i+1]^crc,
+ data_buf[i+2]^crc,
+ data_buf[i+3]^crc,
+ segment_flag,
+ (segment_flag&0x4)>>2,
+ (segment_flag&0x8)>>3,
+ segment_len,
+ wrp,
+ wrc,
+ ((data_buf[i+3]^crc)&0x80)>>7,
+ segCRC,
+ ( segCRC == segCalcCRC ) ? "OK" : "fail"
+ );
+
+ i += 5;
+
+ if ( wrc>0 ) {
+ PrintAndLog("WRC protected area:");
+
+ for ( k=i; k < wrc; k++)
+ data_buf[k] ^= crc;
+
+ for ( k=i; k < wrc; k += 8)
+ PrintAndLog("%s", sprint_hex( data_buf+k, 8) );
+
+ i += wrc;
+ }
+
+ if ( wrp>wrc ) {
+ PrintAndLog("Remaining write protected area:");
+
+ if ( data_buf[k] > 0) {
+ for (k=i; k < (wrp-wrc); k++)
+ data_buf[k] ^= crc;
+ }
+
+ for (k=i; k < (wrp-wrc); k++)
+ PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
+
+ i += (wrp-wrc);
+
+ if( (wrp-wrc) == 8 )
+ PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
+ }
+
+ PrintAndLog("Remaining segment payload:");
+
+ if ( data_buf[k] > 0 ) {
+ for ( k=i; k < (segment_len - wrp - 5); k++)
+ data_buf[k] ^= crc;
+ }
+
+ for ( k=i; k < (segment_len - wrp - 5); k++)
+ PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
+
+ // end with last segment
+ if (segment_flag & 0x8) return 0;
+
+ } // end for loop
+ return 0;
+}
+
+int CmdLegicRFRead(const char *Cmd) {
+ int byte_count=0, offset=0;
+ sscanf(Cmd, "%i %i", &offset, &byte_count);
+ if(byte_count == 0) byte_count = -1;
+ if(byte_count + offset > 1024) byte_count = 1024 - offset;
+
+ UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
+ clearCommandBuffer();
+ SendCommand(&c);
+ return 0;
+}