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add 'hf mf decrypt' - added a helptext

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chg 'hf mf decrypt' - increased the available input data array.
This commit is contained in:
iceman1001 2017-08-30 19:13:49 +02:00
parent 0c6f601f72
commit 11e72b4064
1 changed files with 33 additions and 10 deletions
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43
client/cmdhfmf.c
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@ -151,6 +151,20 @@ int usage_hf14_restore(void){
PrintAndLog(" hf mf restore 4");
return 0;
}
int usage_hf14_decryptbytes(void){
PrintAndLog("Decrypt Crypto-1 encrypted bytes given some known state of crypto. See tracelog to gather needed values\n");
PrintAndLog("usage: hf mf decrypt [h] <nt> <ar_enc> <at_enc> <data>");
PrintAndLog("options:");
PrintAndLog(" h this help");
PrintAndLog(" <nt> reader nonce");
PrintAndLog(" <ar_enc> encrypted reader response");
PrintAndLog(" <at_enc> encrypted tag response");
PrintAndLog(" <data> encrypted data, taken directly after at_enc and forward");
PrintAndLog("samples:");
PrintAndLog(" hf mf decrypt b830049b 9248314a 9280e203 41e586f9\n");
PrintAndLog(" this sample decrypts 41e586f9 -> 3003999a Annotated: 30 03 [99 9a] auth block 3 [crc]");
return 0;
}
int usage_hf14_eget(void){
PrintAndLog("Usage: hf mf eget <block number>");
@ -2449,21 +2463,30 @@ int CmdHF14AMfCSave(const char *Cmd) {
//needs nt, ar, at, Data to decrypt
int CmdHf14AMfDecryptBytes(const char *Cmd){
uint8_t data[50];
char ctmp = param_getchar(Cmd, 0);
if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_hf14_decryptbytes();
uint32_t nt = param_get32ex(Cmd,0,0,16);
uint32_t ar_enc = param_get32ex(Cmd,1,0,16);
uint32_t at_enc = param_get32ex(Cmd,2,0,16);
int len = 0;
int len = param_getlength(Cmd, 3);
if (len & 1 ) {
PrintAndLog("Uneven hex string length. LEN=%d", len);
return 1;
}
PrintAndLog("nt\t%08X", nt);
PrintAndLog("ar enc\t%08X", ar_enc);
PrintAndLog("at enc\t%08X", at_enc);
uint8_t *data = malloc(len);
param_gethex_ex(Cmd, 3, data, &len);
len /= 2;
int limit = sizeof(data) / 2;
if ( len >= limit )
len = limit;
return tryDecryptWord( nt, ar_enc, at_enc, data, len);
len >>= 1;
tryDecryptWord( nt, ar_enc, at_enc, data, len);
free (data);
return 0;
}
int CmdHf14AMfSetMod(const char *Cmd) {