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(" sample: hf legic read");
+ return 0;
+}
+
/*
* Output BigBuf and deobfuscate LEGIC RF tag data.
- * This is based on information given in the talk held
+ * This is based on information given in the talk held
* by Henryk Ploetz and Karsten Nohl at 26c3
*/
int CmdLegicDecode(const char *Cmd) {
int crc = 0;
int wrp = 0;
int wrc = 0;
- uint8_t data_buf[1200]; // receiver buffer, should be 1024..
+ uint8_t data_buf[1024]; // receiver buffer, should be 1024..
char token_type[4];
- // copy data from proxmark into buffer
- GetFromBigBuf(data_buf, sizeof(data_buf), 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;
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],
uint32_t segCalcCRC = 0;
uint32_t segCRC = 0;
+ // see if user area is xored or just zeros.
+ int numOfZeros = 0;
+ for (int index=22; index < 256; ++index){
+ if ( data_buf[index] == 0x00 )
+ ++numOfZeros;
+ }
+ // if possible zeros is less then 60%, lets assume data is xored
+ // 256 - 22 (header) = 234
+ // 1024 - 22 (header) = 1002
+ int isXored = (numOfZeros*100/stamp_len) < 50;
+ PrintAndLog("is data xored? %d ( %d %)", isXored, (numOfZeros*100/stamp_len));
+
+ print_hex_break( data_buf, 33, 16);
+
+ return 0;
+
PrintAndLog("\nADF: User Area");
- printf("-------------------------------------\n");
+ PrintAndLog("------------------------------------------------------");
i = 22;
// 64 potential segements
// how to detect there is no segments?!?
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)",
+ 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,
if ( hasWRC ) {
PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
-
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
// de-xor? if not zero, assume it needs xoring.
- if ( data_buf[i] > 0) {
+ if ( isXored) {
for ( k=i; k < wrc; ++k)
data_buf[k] ^= crc;
}
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("-----+------------------------------------------------");
- // de-xor? if not zero, assume it needs xoring.
- if ( data_buf[i] > 0) {
+ if (isXored) {
for (k=i; k < wrp_len; ++k)
data_buf[k] ^= crc;
}
}
PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
-
- if ( data_buf[i] > 0 ) {
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+ if ( isXored ) {
for ( k=i; k < remain_seg_payload_len; ++k)
data_buf[k] ^= crc;
}
i += remain_seg_payload_len;
- printf("\n-------------------------------------\n");
+ PrintAndLog("-----+------------------------------------------------\n");
// end with last segment
if (segment_flag & 0x8) return 0;
}
int CmdLegicRFRead(const char *Cmd) {
+
+ // params:
+ // offset in data
+ // number of bytes.
+ char cmdp = param_getchar(Cmd, 0);
+ if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
+
int byte_count=0, offset=0;
sscanf(Cmd, "%i %i", &offset, &byte_count);
if(byte_count == 0) byte_count = -1;
return 0;
}
- FILE *f = fopen(filename, "w");
- if(!f) {
- PrintAndLog("couldn't open '%s'", Cmd+1);
- return -1;
- }
-
GetFromBigBuf(got, requested, offset);
if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
- PrintAndLog("Command execute timeout");
+ PrintAndLog("Command execute timeout");
return 1;
}
+ FILE *f = fopen(filename, "w");
+ if(!f) {
+ PrintAndLog("couldn't open '%s'", Cmd+1);
+ return -1;
+ }
+
for (int j = 0; j < requested; j += 8) {
fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
got[j+0], got[j+1], got[j+2], got[j+3],
int CmdLegicCalcCrc8(const char *Cmd){
int len = strlen(Cmd);
- if (len & 1 ) return usage_legic_calccrc8();
+ if ( len & 1 ) return usage_legic_calccrc8();
- uint8_t *data = malloc(len);
+ // add 1 for null terminator.
+ uint8_t *data = malloc(len+1);
if ( data == NULL ) return 1;
- param_gethex(Cmd, 0, data, len );
+ if (param_gethex(Cmd, 0, data, len )) {
+ free(data);
+ return usage_legic_calccrc8();
+ }
uint32_t checksum = CRC8Legic(data, len/2);
PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
projects / proxmark3-svn / blobdiff