+int usage_legic_calccrc8(void){
+ PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
+ PrintAndLog("There must be an even number of hexsymbols as input.");
+ PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc> c <crc type>");
+ PrintAndLog("Options:");
+ PrintAndLog(" b <hexbytes> : hex bytes");
+ PrintAndLog(" u <uidcrc> : MCC hexbyte");
+ PrintAndLog(" c <crc type> : 8|16 bit crc size");
+ PrintAndLog("");
+ PrintAndLog("Samples:");
+ PrintAndLog(" hf legic crc8 b deadbeef1122");
+ PrintAndLog(" hf legic crc8 b deadbeef1122 u 9A c 16");
+ return 0;
+}
+
+int usage_legic_load(void){
+ PrintAndLog("It loads datasamples from the file `filename` to device memory");
+ PrintAndLog("Usage: hf legic load <file name>");
+ PrintAndLog("");
+ PrintAndLog("Samples:");
+ PrintAndLog(" hf legic load filename");
+ return 0;
+}
+
+int usage_legic_read(void){
+ PrintAndLog("Read data from a legic tag.");
+ PrintAndLog("Usage: hf legic read <offset> <num of bytes>");
+ PrintAndLog("Options:");
+ PrintAndLog(" <offset> : offset in data array to start download from");
+ PrintAndLog(" <num of bytes> : number of bytes to download");
+ PrintAndLog("");
+ PrintAndLog("Samples:");
+ PrintAndLog(" hf legic read");
+ return 0;
+}
+
+int usage_legic_sim(void){
+ return 0;
+}
+int usage_legic_rawwrite(void){
+ return 0;
+}
+int usage_legic_fill(void){
+ 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 = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
+ int crc = 0, wrp = 0, wrc = 0;
+ uint8_t stamp_len = 0;
+ uint8_t data_buf[1052]; // receiver buffer
+ char token_type[5] = {0,0,0,0,0};
+ int dcf = 0;
+ int bIsSegmented = 0;
+
+ // download EML memory, where the "legic read" command puts the data.
+ GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
+ PrintAndLog("Command execute timeout");
+ return 1;
+ }
+
+ // 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("------------------------------------------------------");
+ 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"
+ );
+
+
+ token_type[0] = 0;
+ dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
+
+ // New unwritten media?
+ if(dcf == 0xFFFF) {
+
+ PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
+ dcf,
+ data_buf[5],
+ data_buf[6]
+ );
+
+ } else if(dcf > 60000) { // Master token?
+
+ int fl = 0;
+
+ if(data_buf[6] == 0xec) {
+ strncpy(token_type, "XAM", sizeof(token_type));
+ fl = 1;
+ stamp_len = 0x0c - (data_buf[5] >> 4);
+ } else {
+ switch (data_buf[5] & 0x7f) {
+ case 0x00 ... 0x2f:
+ strncpy(token_type, "IAM", sizeof(token_type));
+ fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
+ break;
+ case 0x30 ... 0x6f:
+ strncpy(token_type, "SAM", sizeof(token_type));
+ fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
+ break;
+ case 0x70 ... 0x7f:
+ strncpy(token_type, "GAM", sizeof(token_type));
+ fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
+ break;
+ }
+
+ stamp_len = 0xfc - data_buf[6];
+ }
+
+ PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
+ dcf,
+ data_buf[5],
+ data_buf[6],
+ token_type,
+ (data_buf[5] & 0x80 )>> 7,
+ stamp_len,
+ fl
+ );
+
+ } else { // Is IM(-S) type of card...
+
+ if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
+ bIsSegmented = 1;
+ strncpy(token_type, "IM-S", sizeof(token_type));
+ } else {
+ strncpy(token_type, "IM", sizeof(token_type));
+ }
+
+ PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
+ dcf,
+ data_buf[5],
+ data_buf[6],
+ token_type,
+ (data_buf[5]&0x80) >> 7
+ );
+ }
+
+ // Makes no sence to show this on blank media...
+ if(dcf != 0xFFFF) {
+
+ if(bIsSegmented) {
+ PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
+ data_buf[7] & 0x0f,
+ (data_buf[7] & 0x70) >> 4,
+ (data_buf[7] & 0x80) >> 7,
+ data_buf[8]
+ );
+ }
+
+ // Header area is only available on IM-S cards, on master tokens this data is the master token data itself
+ if(bIsSegmented || dcf > 60000) {
+ if(dcf > 60000) {
+ PrintAndLog("Master token data");
+ PrintAndLog("%s", sprint_hex(data_buf+8, 14));
+ } else {
+ PrintAndLog("Remaining Header Area");
+ PrintAndLog("%s", sprint_hex(data_buf+9, 13));
+ }
+ }
+ }
+
+ uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
+ uint32_t segCalcCRC = 0;
+ uint32_t segCRC = 0;
+
+ // Data card?
+ if(dcf <= 60000) {
+
+ PrintAndLog("\nADF: User Area");
+ PrintAndLog("------------------------------------------------------");
+
+ if(bIsSegmented) {
+
+ // Data start point on segmented cards
+ i = 22;
+
+ // decode segments
+ for (segmentNum=1; segmentNum < 128; segmentNum++ )
+ {
+ 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;
+
+ bool hasWRC = (wrc > 0);
+ bool hasWRP = (wrp > wrc);
+ int wrp_len = (wrp - wrc);
+ int remain_seg_payload_len = (segment_len - wrp - 5);
+
+ // validate segment-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);
+ segCRC = data_buf[i+4] ^ crc;
+
+ PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u, Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
+ segmentNum,
+ data_buf[i] ^ crc,
+ data_buf[i+1] ^ crc,
+ data_buf[i+2] ^ crc,
+ data_buf[i+3] ^ crc,
+ segment_len,
+ segment_flag,
+ (segment_flag & 0x4) >> 2,
+ (segment_flag & 0x8) >> 3,
+ wrp,
+ wrc,
+ ((data_buf[i+3]^crc) & 0x80) >> 7,
+ segCRC,
+ ( segCRC == segCalcCRC ) ? "OK" : "fail"
+ );
+
+ i += 5;
+
+ if ( hasWRC ) {
+ PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+
+ for ( k=i; k < (i + wrc); ++k)
+ data_buf[k] ^= crc;
+
+ print_hex_break( data_buf+i, wrc, 16);
+
+ i += wrc;
+ }
+
+ if ( hasWRP ) {
+ PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+
+ for (k=i; k < (i+wrp_len); ++k)
+ data_buf[k] ^= crc;
+
+ print_hex_break( data_buf+i, wrp_len, 16);
+
+ i += wrp_len;
+
+ // does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
+ if( wrp_len == 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: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+
+ for ( k=i; k < (i+remain_seg_payload_len); ++k)
+ data_buf[k] ^= crc;
+
+ print_hex_break( data_buf+i, remain_seg_payload_len, 16);
+
+ i += remain_seg_payload_len;
+
+ PrintAndLog("-----+------------------------------------------------\n");
+
+ // end with last segment
+ if (segment_flag & 0x8) return 0;
projects / proxmark3-svn / blobdiff