#include "cmdhflegic.h"
#include "cmdmain.h"
#include "util.h"
+#include "crc.h"
static int CmdHelp(const char *Cmd);
+int usage_legic_calccrc8(void){
+ PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
+ PrintAndLog("There must be an even number of hexsymbols as input.");
+ PrintAndLog("Usage: hf legic crc8 <hexbytes>");
+ PrintAndLog("Options :");
+ PrintAndLog(" <hexbytes> : hex bytes in a string");
+ PrintAndLog("");
+ PrintAndLog("Sample : hf legic crc8 deadbeef1122");
+ 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(" 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, j, k, n;
+int CmdLegicDecode(const char *Cmd) {
+ // Index for the bytearray.
+ int i = 0;
+ int k = 0, segmentNum;
int segment_len = 0;
int segment_flag = 0;
- int stamp_len = 0;
+ uint8_t stamp_len = 0;
int crc = 0;
int wrp = 0;
int wrc = 0;
- uint8_t data_buf[3076]; // 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
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",
+ 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]
+ data_buf[4],
+ (calc_crc == crc) ? "OK":"Fail"
);
-
- crc = data_buf[4];
- 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;
}
stamp_len = 0xfc - data_buf[6];
- PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
+ PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",
data_buf[5],
data_buf[6],
token_type,
PrintAndLog("Remaining Header Area");
PrintAndLog("%s", sprint_hex(data_buf+9, 13));
+
+ uint8_t segCrcBytes[8] = {0x00};
+ uint32_t segCalcCRC = 0;
+ uint32_t segCRC = 0;
+
PrintAndLog("\nADF: User Area");
-
+ printf("-------------------------------------\n");
i = 22;
- for ( n=0; n<64; n++ ) {
+ // 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;
- 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",
- n,
+ 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,
- segment_len,
+ (segment_flag & 0x4) >> 2,
+ (segment_flag & 0x8) >> 3,
wrp,
wrc,
- ((data_buf[i+3]^crc)&0x80)>>7,
- (data_buf[i+4]^crc)
+ ((data_buf[i+3]^crc) & 0x80) >> 7,
+ segCRC,
+ ( segCRC == segCalcCRC ) ? "OK" : "fail"
);
- i+=5;
+ i += 5;
- if ( wrc>0 ) {
- PrintAndLog("WRC protected area:");
- for ( k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
- sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
- out_string[j+2] = ' ';
- }
-
- out_string[j] = '\0';
+ if ( hasWRC ) {
+ PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
- PrintAndLog("%s", out_string);
+ // de-xor? if not zero, assume it needs xoring.
+ if ( data_buf[i] > 0) {
+ for ( k=i; k < wrc; ++k)
+ data_buf[k] ^= crc;
+ }
+ print_hex_break( data_buf+i, wrc, 16);
+
+ i += wrc;
}
- if ( wrp>wrc ) {
- PrintAndLog("Remaining write protected area:");
+ if ( hasWRP ) {
+ PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
- for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
- sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
- out_string[j+2] = ' ';
- };
-
- out_string[j] = '\0';
-
- PrintAndLog("%s", out_string);
- if( (wrp-wrc) == 8 ) {
- sprintf(out_string, "Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
- PrintAndLog("%s", out_string);
+ // de-xor? if not zero, assume it needs xoring.
+ if ( data_buf[i] > 0) {
+ for (k=i; k < wrp_len; ++k)
+ data_buf[k] ^= crc;
}
+
+ print_hex_break( data_buf+i, wrp_len, 16);
+
+ i += wrp_len;
+
+ // does this one work?
+ 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:");
- for ( k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
- sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
- out_string[j+2] = ' ';
- };
-
- out_string[j] = '\0';
-
- PrintAndLog("%s", out_string);
+ PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
+
+ if ( data_buf[i] > 0 ) {
+ for ( k=i; k < 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;
+
+ printf("\n-------------------------------------\n");
+
// end with last segment
if (segment_flag & 0x8) return 0;
}
int CmdLegicLoad(const char *Cmd) {
- char filename[FILE_PATH_SIZE] = {0x00};
- int len = 0;
char cmdp = param_getchar(Cmd, 0);
- if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) {
- 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;
- }
+ if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
- len = strlen(Cmd);
+ char filename[FILE_PATH_SIZE] = {0x00};
+ int len = strlen(Cmd);
+
if (len > FILE_PATH_SIZE) {
PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
return 0;
}
char line[80];
- int offset = 0, j;
- uint32_t data[8] = {0x00};
-
+ int offset = 0;
+ uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
+ int index = 0;
+ int totalbytes = 0;
while ( fgets(line, sizeof(line), f) ) {
int res = sscanf(line, "%x %x %x %x %x %x %x %x",
- &data[0], &data[1], &data[2], &data[3],
- &data[4], &data[5], &data[6], &data[7]);
+ (unsigned int *)&data[index],
+ (unsigned int *)&data[index + 1],
+ (unsigned int *)&data[index + 2],
+ (unsigned int *)&data[index + 3],
+ (unsigned int *)&data[index + 4],
+ (unsigned int *)&data[index + 5],
+ (unsigned int *)&data[index + 6],
+ (unsigned int *)&data[index + 7]);
if(res != 8) {
PrintAndLog("Error: could not read samples");
fclose(f);
return -1;
}
-
- UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
- memcpy(c.d.asBytes, data, 8);
- clearCommandBuffer();
- SendCommand(&c);
- WaitForResponse(CMD_ACK, NULL);
- offset += 8;
+ index += res;
+
+ if ( index == USB_CMD_DATA_SIZE ){
+// PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
+ UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
+ memcpy(c.d.asBytes, data, sizeof(data));
+ clearCommandBuffer();
+ SendCommand(&c);
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
+ PrintAndLog("Command execute timeout");
+ fclose(f);
+ return 1;
+ }
+ offset += index;
+ totalbytes += index;
+ index = 0;
+ }
}
fclose(f);
- PrintAndLog("loaded %u samples", offset);
+
+ // left over bytes?
+ if ( index != 0 ) {
+ UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
+ memcpy(c.d.asBytes, data, 8);
+ clearCommandBuffer();
+ SendCommand(&c);
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
+ PrintAndLog("Command execute timeout");
+ return 1;
+ }
+ totalbytes += index;
+ }
+
+ PrintAndLog("loaded %u samples", totalbytes);
return 0;
}
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",
- got[j+0],
- got[j+1],
- got[j+2],
- got[j+3],
- got[j+4],
- got[j+5],
- got[j+6],
- got[j+7]
+ got[j+0], got[j+1], got[j+2], got[j+3],
+ got[j+4], got[j+5], got[j+6], got[j+7]
);
delivered += 8;
if (delivered >= requested) break;
}
int CmdLegicRfSim(const char *Cmd) {
- UsbCommand c= {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
+ UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
clearCommandBuffer();
SendCommand(&c);
return 0;
}
+int CmdLegicCalcCrc8(const char *Cmd){
+
+ int len = strlen(Cmd);
+ if (len & 1 ) return usage_legic_calccrc8();
+
+ uint8_t *data = malloc(len);
+ if ( data == NULL ) return 1;
+
+ param_gethex(Cmd, 0, data, len );
+
+ uint32_t checksum = CRC8Legic(data, len/2);
+ PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
+ free(data);
+ return 0;
+}
+
static command_t CommandTable[] = {
- {"help", CmdHelp, 1, "This help"},
- {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
- {"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
- {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
- {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
- {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
- {"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
- {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
+ {"help", CmdHelp, 1, "This help"},
+ {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
+ {"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
+ {"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
+ {"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
+ {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
+ {"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
+ {"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
+ {"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
{NULL, NULL, 0, NULL}
};
projects / proxmark3-svn / blobdiff