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cmdwiegand: add option to brute-force hex input length

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This commit is contained in:
Jakub Kramarz
2025-09-23 00:51:51 +02:00
parent 5b8bd31d17
commit 75ba4e97b1
2 changed files with 30 additions and 1 deletions
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client/src/cmdwiegand.c
+9
View File
@@ -165,6 +165,7 @@ int CmdWiegandDecode(const char *Cmd) {
arg_str0("r", "raw", "<hex>", "raw hex to be decoded"),
arg_str0("b", "bin", "<bin>", "binary string to be decoded"),
arg_str0("n", "new", "<hex>", "new padded pacs as raw hex to be decoded"),
arg_lit0("f", "force", "skip preabmle checking, brute force all possible lengths for raw hex input"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
@@ -180,6 +181,8 @@ int CmdWiegandDecode(const char *Cmd) {
uint8_t phex[8] = {0};
res = CLIParamHexToBuf(arg_get_str(ctx, 3), phex, sizeof(phex), &plen);
bool no_preamble = arg_get_lit(ctx, 4);
CLIParserFree(ctx);
if (res) {
@@ -195,6 +198,12 @@ int CmdWiegandDecode(const char *Cmd) {
PrintAndLogEx(ERR, "Hex string contains none hex chars");
return PM3_EINVARG;
}
if(no_preamble){
// pass hex input length as is and brute force all possible lengths
blen = -hlen;
}
} else if (blen) {
int n = binarray_to_u96(&top, &mid, &bot, binarr, blen);
if (n != blen) {
client/src/wiegand_formats.c
+21 -1
View File
@@ -1716,8 +1716,28 @@ bool decode_wiegand(uint32_t top, uint32_t mid, uint32_t bot, int n) {
if (n > 0) {
wiegand_message_t packed = initialize_message_object(top, mid, bot, n);
res = HIDTryUnpack(&packed);
} else if(n < 0) {
PrintAndLogEx(INFO, "Brute forcing all possible lengths...");
int scan_end = (-n)*4;
int scan_start = scan_end-3;
wiegand_message_t packed = initialize_message_object(top, mid, bot, scan_end);
// find the first bit set in the first nibble
for(int i = 0; i < 4; i++) {
if (get_bit_by_position(&packed, i) == 1) {
scan_start = scan_end-i;
break;
}
}
PrintAndLogEx(INFO, "Scanning from bit %d to %d...", scan_start, scan_end);
for(int i = scan_start; i <= scan_end; i++) {
packed.Length = i;
res |= HIDTryUnpack(&packed);
}
} else {
wiegand_message_t packed = initialize_message_object(top, mid, bot, n); // 26-37 bits
wiegand_message_t packed = initialize_message_object(top, mid, bot, 0); // 26-37 bits
res = HIDTryUnpack(&packed);
PrintAndLogEx(INFO, "Trying with a preamble bit...");