* by Henryk Ploetz and Karsten Nohl at 26c3
*/
int CmdLegicDecode(const char *Cmd) {
- int i, k, n;
+ // Index for the bytearray.
+ int i = 0;
+ int k = 0, segmentNum;
int segment_len = 0;
int segment_flag = 0;
uint8_t 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
+ uint8_t data_buf[1200]; // receiver buffer, should be 1024..
char token_type[4];
// copy data from proxmark into buffer
(calc_crc == crc) ? "OK":"Fail"
);
- switch (data_buf[5]&0x7f) {
+ switch (data_buf[5] & 0x7f) {
case 0x00 ... 0x2f:
strncpy(token_type, "IAM",sizeof(token_type));
break;
case 0x30 ... 0x6f:
- strcpy(token_type, "SAM");
+ strncpy(token_type, "SAM",sizeof(token_type));
break;
case 0x70 ... 0x7f:
- strcpy(token_type, "GAM");
+ strncpy(token_type, "GAM",sizeof(token_type));
break;
default:
- strcpy(token_type, "???");
+ strncpy(token_type, "???",sizeof(token_type));
break;
}
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++ ) {
+
+ PrintAndLog("\nADF: User Area");
+ i = 22;
+ // 64 potential segements
+ for ( segmentNum=0; segmentNum<64; 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;
- /* validate segment-crc */
- segCRC = data_buf[i+4]^crc;
+ bool hasWRC = (wrc > 0);
+ bool hasWRP = (wrp > wrc);
+ int wrp_len = (wrp - wrc);
+ int remain_seg_payload_len = (segment_len - wrp - 5);
- 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
+ // 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: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x (%s)",
- n,
+ segmentNum,
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_flag & 0x4) >> 2,
+ (segment_flag & 0x8) >> 3,
segment_len,
wrp,
wrc,
- ((data_buf[i+3]^crc)&0x80)>>7,
+ ((data_buf[i+3]^crc) & 0x80) >> 7,
segCRC,
( segCRC == segCalcCRC ) ? "OK" : "fail"
);
i += 5;
- if ( wrc>0 ) {
- PrintAndLog("WRC protected area:");
+ if ( hasWRC ) {
+ PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
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) );
+ //is WRC / 8?
+
+ // for ( k=i; k < wrc; k += 8)
+ PrintAndLog("%s", sprint_hex( data_buf+i, wrc ) );
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;
- }
+ if ( hasWRP ) {
+ PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
+
+ // // de-xor?
+ // if ( data_buf[k] > 0) {
+ // for (k=i; k < wrp_len; k++)
+ // data_buf[k] ^= crc;
+ // }
- for (k=i; k < (wrp-wrc); k++)
- PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
-
- i += (wrp-wrc);
+ // for (k=i; k < wrp_len; k += 16) {
+
+ PrintAndLog("%s", sprint_hex( data_buf+i, wrp_len));
+ // }
- 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);
+ i += wrp_len;
+
+ // 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:");
- if ( data_buf[k] > 0 ) {
- for ( k=i; k < (segment_len - wrp - 5); k++)
- data_buf[k] ^= crc;
- }
+ // if ( data_buf[k] > 0 ) {
+ // for ( k=i; k < remain_seg_payload_len; k++)
+ // data_buf[k] ^= crc;
+ // }
- for ( k=i; k < (segment_len - wrp - 5); k++)
- PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
+ // for ( k=i; k < remain_seg_payload_len; k++)
+ PrintAndLog("%s", sprint_hex( data_buf+i, remain_seg_payload_len ) );
+ i += remain_seg_payload_len;
+
// end with last segment
if (segment_flag & 0x8) return 0;
memcpy(c.d.asBytes, data, sizeof(data));
clearCommandBuffer();
SendCommand(&c);
- WaitForResponse(CMD_ACK, NULL);
-
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
+ PrintAndLog("Command execute timeout");
+ fclose(f);
+ return 1;
+ }
offset += index;
totalbytes += index;
index = 0;
memcpy(c.d.asBytes, data, 8);
clearCommandBuffer();
SendCommand(&c);
- WaitForResponse(CMD_ACK, NULL);
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
+ PrintAndLog("Command execute timeout");
+ return 1;
+ }
totalbytes += index;
}
return -1;
}
- GetFromBigBuf(got,requested,offset);
- WaitForResponse(CMD_ACK,NULL);
+ GetFromBigBuf(got, requested, offset);
+ WaitForResponse(CMD_ACK, NULL);
for (int j = 0; j < requested; j += 8) {
fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
projects / proxmark3-svn / blobdiff