//-----------------------------------------------------------------------------
// High frequency Legic commands
//-----------------------------------------------------------------------------
-
-#include <stdio.h>
-#include <string.h>
-#include "proxmark3.h"
-#include "data.h"
-#include "ui.h"
-#include "cmdparser.h"
#include "cmdhflegic.h"
-#include "cmdmain.h"
-#include "util.h"
-#include "crc.h"
+
static int CmdHelp(const char *Cmd);
+#define SESSION_IV 0x55
+#define MAX_LENGTH 1024
+
int usage_legic_calccrc8(void){
- PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
+ 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 <hexbytes>");
- PrintAndLog("Options :");
- PrintAndLog(" <hexbytes> : hex bytes in a string");
+ PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc> c <crc type>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : this help");
+ PrintAndLog(" b <hexbytes> : hex bytes");
+ PrintAndLog(" u <uidcrc> : MCC hexbyte");
+ PrintAndLog(" c <crc type> : 8|16 bit crc size");
PrintAndLog("");
- PrintAndLog("Sample : hf legic crc8 deadbeef1122");
+ 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(" sample: hf legic load filename");
+ PrintAndLog("Usage: hf legic load [h] <file name>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : this help");
+ PrintAndLog(" <filename> : Name of file to load");
+ 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 [h] <offset> <length> <IV>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : this help");
+ PrintAndLog(" <offset> : offset in data array to start download from");
+ PrintAndLog(" <length> : number of bytes to download");
+ PrintAndLog(" <IV> : (optional) Initialization vector to use (ODD and 7bits)");
+ PrintAndLog("");
+ PrintAndLog("Samples:");
+ PrintAndLog(" hf legic read");
+ PrintAndLog(" hf legic read 10 4");
+ return 0;
+}
+int usage_legic_sim(void){
+ PrintAndLog("Missing help text.");
+ return 0;
+}
+int usage_legic_write(void){
+ PrintAndLog(" Write sample buffer to a legic tag. (use after load or read)");
+ PrintAndLog("Usage: hf legic write [h] <offset> <length> <IV>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : this help");
+ PrintAndLog(" <offset> : offset in data array to start writing from");
+ PrintAndLog(" <length> : number of bytes to write");
+ PrintAndLog(" <IV> : (optional) Initialization vector to use (ODD and 7bits)");
+ PrintAndLog("");
+ PrintAndLog("Samples:");
+ PrintAndLog(" hf legic write");
+ PrintAndLog(" hf legic write 10 4");
+ return 0;
+}
+int usage_legic_rawwrite(void){
+ PrintAndLog("Write raw data direct to a specific address on legic tag.");
+ PrintAndLog("Usage: hf legic writeraw [h] <address> <value> <IV>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : this help");
+ PrintAndLog(" <address> : address to write to");
+ PrintAndLog(" <value> : value to write");
+ PrintAndLog(" <IV> : (optional) Initialization vector to use (ODD and 7bits)");
+ PrintAndLog("");
+ PrintAndLog("Samples:");
+ PrintAndLog(" hf legic writeraw");
+ PrintAndLog(" hf legic writeraw 10 4");
+ return 0;
+}
+int usage_legic_fill(void){
+ PrintAndLog("Missing help text.");
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 i, k, n;
- int segment_len = 0;
- int segment_flag = 0;
+
+ 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;
- 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];
+ uint8_t data_buf[1024]; // receiver buffer
+ char token_type[5] = {0,0,0,0,0};
+ int dcf = 0;
+ int bIsSegmented = 0;
// copy data from proxmark into buffer
GetFromBigBuf(data_buf,sizeof(data_buf),0);
- WaitForResponse(CMD_ACK,NULL);
-
+ 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],
(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];
+ token_type[0] = 0;
+ dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];
- 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
- );
+ // New unwritten media?
+ if(dcf == 0xFFFF) {
- 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("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("Remaining Header Area");
- PrintAndLog("%s", sprint_hex(data_buf+9, 13));
- PrintAndLog("\nADF: User Area");
-
- i = 22;
- uint8_t segCrcBytes[8] = {0x00};
+ 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;
-
- 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;
+ // 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);
- 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"
- );
+ // 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("-----+------------------------------------------------");
- i += 5;
+ for ( k=i; k < (i + wrc); ++k)
+ data_buf[k] ^= crc;
+
+ print_hex_break( data_buf+i, wrc, 16);
+
+ i += wrc;
+ }
- if ( wrc>0 ) {
- PrintAndLog("WRC 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);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+
+ for (k=i; k < (i+wrp_len); ++k)
+ data_buf[k] ^= crc;
- for ( k=i; k < wrc; k++)
- data_buf[k] ^= crc;
+ print_hex_break( data_buf+i, wrp_len, 16);
- for ( k=i; k < wrc; k += 8)
- PrintAndLog("%s", sprint_hex( data_buf+k, 8) );
+ i += wrp_len;
- i += wrc;
- }
+ // 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);
+ }
- if ( wrp>wrc ) {
- PrintAndLog("Remaining write protected area:");
+ PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
- if ( data_buf[k] > 0) {
- for (k=i; k < (wrp-wrc); k++)
+ for ( k=i; k < (i+remain_seg_payload_len); ++k)
data_buf[k] ^= crc;
- }
-
- for (k=i; k < (wrp-wrc); k++)
- PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
+
+ 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;
- i += (wrp-wrc);
+ } // end for loop
+
+ } else {
+
+ // Data start point on unsegmented cards
+ i = 8;
+
+ wrp = data_buf[7] & 0x0F;
+ wrc = (data_buf[7] & 0x70) >> 4;
+
+ bool hasWRC = (wrc > 0);
+ bool hasWRP = (wrp > wrc);
+ int wrp_len = (wrp - wrc);
+ int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
+
+ PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
+ wrp,
+ wrc,
+ (data_buf[7] & 0x80) >> 7
+ );
+
+ if ( hasWRC ) {
+ PrintAndLog("WRC protected area: (I %d | WRC %d)", i, wrc);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+ print_hex_break( data_buf+i, wrc, 16);
+ i += wrc;
+ }
+
+ if ( hasWRP ) {
+ PrintAndLog("Remaining write protected area: (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+ print_hex_break( data_buf + i, wrp_len, 16);
+ 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);
- }
+ // 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], data_buf[i-3], data_buf[i-2]);
+ }
- PrintAndLog("Remaining segment payload:");
+ PrintAndLog("Remaining segment payload: (I %d | Remain LEN %d)", i, remain_seg_payload_len);
+ PrintAndLog("\nrow | data");
+ PrintAndLog("-----+------------------------------------------------");
+ print_hex_break( data_buf + i, remain_seg_payload_len, 16);
+ i += remain_seg_payload_len;
- if ( data_buf[k] > 0 ) {
- for ( k=i; k < (segment_len - wrp - 5); k++)
- data_buf[k] ^= crc;
+ PrintAndLog("-----+------------------------------------------------\n");
}
-
- 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}};
+ // params:
+ // offset in data
+ // number of bytes.
+ char cmdp = param_getchar(Cmd, 0);
+ if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
+
+ uint32_t offset = 0, len = 0, IV = 1;
+ sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
+
+ // OUT-OF-BOUNDS check
+ if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
+
+ if ( (IV & 0x7F) != IV ){
+ IV &= 0x7F;
+ PrintAndLog("Truncating IV to 7bits");
+ }
+ if ( (IV & 1) == 0 ){
+ IV |= 0x01; // IV must be odd
+ PrintAndLog("LSB of IV must be SET");
+ }
+ PrintAndLog("Current IV: 0x%02x", IV);
+
+ // get some prng bytes from
+ uint8_t temp[12];
+ legic_prng_init(IV);
+ for ( uint8_t j = 0; j < sizeof(temp); ++j)
+ temp[j] = legic_prng_get_bits(8);
+
+ PrintAndLog("PRNG: %s", sprint_hex(temp, sizeof(temp)));
+
+ UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, IV}};
clearCommandBuffer();
SendCommand(&c);
+ UsbCommand resp;
+ if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {
+ uint8_t isOK = resp.arg[0] & 0xFF;
+ uint16_t len = resp.arg[1] & 0x3FF;
+ if ( isOK ) {
+ PrintAndLog("OK : %d", isOK);
+ PrintAndLog("use 'hf legic decode' or");
+ PrintAndLog("'data hexsamples %d' to view results", len);
+ }
+ } else {
+ PrintAndLog("command execution time out");
+ return 1;
+ }
+
+ //uint8_t got[12000];
+ //GetFromBigBuf(got,sizeof(got),0);
+ //WaitForResponse(CMD_ACK,NULL);
return 0;
}
int CmdLegicLoad(const char *Cmd) {
-
+
+// iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)
char cmdp = param_getchar(Cmd, 0);
if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
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;
}
int requested = 1024;
int offset = 0;
int delivered = 0;
- char filename[FILE_PATH_SIZE];
+ char filename[FILE_PATH_SIZE] = {0x00};
uint8_t got[1024] = {0x00};
+ memset(filename, 0, FILE_PATH_SIZE);
+
sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
/* If no length given save entire legic read buffer */
return 0;
}
+ GetFromBigBuf(got, requested, offset);
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
+ PrintAndLog("Command execute timeout");
+ return 1;
+ }
+
FILE *f = fopen(filename, "w");
if(!f) {
PrintAndLog("couldn't open '%s'", Cmd+1);
return -1;
}
-
- 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],
return 0;
}
+//TODO: write a help text (iceman)
int CmdLegicRfSim(const char *Cmd) {
UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
}
int CmdLegicRfWrite(const char *Cmd) {
- UsbCommand c = {CMD_WRITER_LEGIC_RF};
- int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
- if(res != 2) {
- PrintAndLog("Please specify the offset and length as two hex strings");
+
+ // params:
+ // offset - in tag memory
+ // length - num of bytes to be written
+ // IV - initialisation vector
+
+ char cmdp = param_getchar(Cmd, 0);
+ if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write();
+
+ uint32_t offset = 0, len = 0, IV = 0;
+
+ UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
+ int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
+ if(res < 2) {
+ PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string");
return -1;
}
+
+ // OUT-OF-BOUNDS check
+ if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
+
+ if ( (IV & 0x7F) != IV ){
+ IV &= 0x7F;
+ PrintAndLog("Truncating IV to 7bits");
+ }
+ if ( (IV & 1) == 0 ){
+ IV |= 0x01; // IV must be odd
+ PrintAndLog("LSB of IV must be SET");
+ }
+
+ PrintAndLog("Current IV: 0x%02x", IV);
+
+ c.arg[0] = offset;
+ c.arg[1] = len;
+ c.arg[2] = IV;
+
clearCommandBuffer();
SendCommand(&c);
return 0;
}
+int CmdLegicRfRawWrite(const char *Cmd) {
+
+ char cmdp = param_getchar(Cmd, 0);
+ if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite();
+
+ uint32_t address = 0, data = 0, IV = 0;
+ char answer;
+
+ UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
+ int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV);
+ if(res < 2)
+ return usage_legic_rawwrite();
+
+ // OUT-OF-BOUNDS check
+ if(address > MAX_LENGTH)
+ return usage_legic_rawwrite();
+
+ if ( (IV & 0x7F) != IV ){
+ IV &= 0x7F;
+ PrintAndLog("Truncating IV to 7bits");
+ }
+ if ( (IV & 1) == 0 ){
+ IV |= 0x01; // IV must be odd
+ PrintAndLog("LSB of IV must be SET");
+ }
+ PrintAndLog("Current IV: 0x%02x", IV);
+
+ c.arg[0] = address;
+ c.arg[1] = data;
+ c.arg[2] = IV;
+
+ if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
+ PrintAndLog("############# DANGER !! #############");
+ PrintAndLog("# changing the DCF is irreversible #");
+ PrintAndLog("#####################################");
+ PrintAndLog("do youe really want to continue? y(es) n(o)");
+ if (scanf(" %c", &answer) > 0 && (answer == 'y' || answer == 'Y')) {
+ SendCommand(&c);
+ return 0;
+ }
+ return -1;
+ }
+
+ clearCommandBuffer();
+ SendCommand(&c);
+ return 0;
+}
+
+//TODO: write a help text (iceman)
int CmdLegicRfFill(const char *Cmd) {
- UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
+ UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
if(res != 3) {
PrintAndLog("Please specify the offset, length and value as two hex strings");
int i;
UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
- for(i = 0; i < 48; i++) {
- c.d.asBytes[i] = cmd.arg[2];
- }
-
+ memset(c.d.asBytes, cmd.arg[2], 48);
+
for(i = 0; i < 22; i++) {
c.arg[0] = i*48;
+
+ clearCommandBuffer();
SendCommand(&c);
- WaitForResponse(CMD_ACK,NULL);
+ WaitForResponse(CMD_ACK, NULL);
}
clearCommandBuffer();
SendCommand(&cmd);
int CmdLegicCalcCrc8(const char *Cmd){
- int len = strlen(Cmd);
- if (len & 1 ) return usage_legic_calccrc8();
+ uint8_t *data = NULL;
+ uint8_t cmdp = 0, uidcrc = 0, type=0;
+ bool errors = false;
+ int len = 0;
+ int bg, en;
- uint8_t *data = malloc(len);
- if ( data == NULL ) return 1;
-
- param_gethex(Cmd, 0, data, len );
+ while(param_getchar(Cmd, cmdp) != 0x00) {
+ switch(param_getchar(Cmd, cmdp)) {
+ case 'b':
+ case 'B':
+ // peek at length of the input string so we can
+ // figure out how many elements to malloc in "data"
+ bg=en=0;
+ if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
+ errors = true;
+ break;
+ }
+ len = (en - bg + 1);
+
+ // check that user entered even number of characters
+ // for hex data string
+ if (len & 1) {
+ errors = true;
+ break;
+ }
+
+ // it's possible for user to accidentally enter "b" parameter
+ // more than once - we have to clean previous malloc
+ if (data) free(data);
+ data = malloc(len >> 1);
+ if ( data == NULL ) {
+ PrintAndLog("Can't allocate memory. exiting");
+ errors = true;
+ break;
+ }
+
+ if (param_gethex(Cmd, cmdp+1, data, len)) {
+ errors = true;
+ break;
+ }
+
+ len >>= 1;
+ cmdp += 2;
+ break;
+ case 'u':
+ case 'U':
+ uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
+ cmdp += 2;
+ break;
+ case 'c':
+ case 'C':
+ type = param_get8ex(Cmd, cmdp+1, 0, 10);
+ cmdp += 2;
+ break;
+ case 'h':
+ case 'H':
+ errors = true;
+ break;
+ default:
+ PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
+ errors = true;
+ break;
+ }
+ if (errors) break;
+ }
+ //Validations
+ if (errors){
+ if (data) free(data);
+ return usage_legic_calccrc8();
+ }
+
+ switch (type){
+ case 16:
+ PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
+ break;
+ default:
+ PrintAndLog("LEGIC CRC8: %X", CRC8Legic(data, len) );
+ break;
+ }
- uint32_t checksum = CRC8Legic(data, len/2);
- PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
- free(data);
+ if (data) 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)"},
- {"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
+ {"read", CmdLegicRFRead, 0, "[offset][length] <iv> -- 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)"},
+ {"write", CmdLegicRfWrite,0, "<offset> <length> <iv> -- Write sample buffer (user after load or read)"},
+ {"writeraw",CmdLegicRfRawWrite, 0, "<address> <value> <iv> -- Write direct to address"},
{"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