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fix: hf iclass decrypt - making sure we use available bytes even if app limit reports much more data

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This commit is contained in:
iceman1001 2020-03-11 17:08:03 +01:00
parent d63d6d0978
commit b96585483d
1 changed files with 17 additions and 5 deletions
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22
client/cmdhficlass.c
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@ -785,7 +785,7 @@ static int CmdHFiClassDecrypt(const char *Cmd) {
return usage_hf_iclass_decrypt();
case 'd':
if (param_gethex(Cmd, cmdp + 1, enc_data, 16)) {
PrintAndLogEx(ERR, "data must be 16 HEX symbols");
PrintAndLogEx(ERR, "Data must be 16 HEX symbols");
errors = true;
break;
}
@ -794,7 +794,7 @@ static int CmdHFiClassDecrypt(const char *Cmd) {
break;
case 'f':
if (param_getstr(Cmd, cmdp + 1, filename, sizeof(filename)) == 0) {
PrintAndLogEx(WARNING, "no filename found after f");
PrintAndLogEx(WARNING, "No filename found after f");
errors = true;
break;
}
@ -864,7 +864,14 @@ static int CmdHFiClassDecrypt(const char *Cmd) {
BLOCK79ENCRYPTION aa1_encryption = (decrypted[(6 * 8) + 7] & 0x03);
for (uint16_t blocknum = 0; blocknum < applimit; ++blocknum) {
uint32_t limit = MIN(applimit, decryptedlen / 8);
if (decryptedlen / 8 != applimit) {
PrintAndLogEx(WARNING, "Actual file len " _YELLOW_("%u") "vs HID app-limit len " _YELLOW_("%u"), decryptedlen, applimit * 8);
PrintAndLogEx(INFO, "Setting limit to " _GREEN_("%u"), limit * 8);
}
for (uint16_t blocknum = 0; blocknum < limit; ++blocknum) {
uint8_t idx = blocknum * 8;
memcpy(enc_data, decrypted + idx, 8);
@ -885,7 +892,12 @@ static int CmdHFiClassDecrypt(const char *Cmd) {
}
//Use the first block (CSN) for filename
char *fptr = calloc(42, sizeof(uint8_t));
char *fptr = calloc(50, sizeof(uint8_t));
if (!fptr) {
PrintAndLogEx(WARNING, "Failed to allocate memory");
free(decrypted);
return PM3_EMALLOC;
}
strcat(fptr, "hf-iclass-");
FillFileNameByUID(fptr, hdr->csn, "-data-decrypted", sizeof(hdr->csn));
@ -893,9 +905,9 @@ static int CmdHFiClassDecrypt(const char *Cmd) {
saveFileEML(fptr, decrypted, decryptedlen, 8);
saveFileJSON(fptr, jsfIclass, decrypted, decryptedlen);
PrintAndLogEx(INFO, "Following output skips CSN / block0");
printIclassDumpContents(decrypted, 1, (decryptedlen / 8), decryptedlen);
// decode block 6
if (memcmp(decrypted + (8 * 6), empty, 8) != 0) {
if (use_sc) {