github/proxmark3
1
0
Fork 0
mirror of https://github.com/Proxmark/proxmark3.git synced 2025-08-20 05:13:22 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add mifare crypto trace decryption utility

Browse source 
allows manual decryption of hf 14a snoop traces of a mf card.
someday we should fix hf mf sniff...
This commit is contained in:
marshmellow42 2015-10-07 00:24:55 -04:00
commit 1a5a73abae
5 changed files with 51 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

20
client/mifarehost.c
View file

@ -619,3 +619,23 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
return 0;
}
int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){
/*
uint32_t nt; // tag challenge
uint32_t ar_enc; // encrypted reader response
uint32_t at_enc; // encrypted tag response
*/
if (traceCrypto1) {
crypto1_destroy(traceCrypto1);
}
ks2 = ar_enc ^ prng_successor(nt, 64);
ks3 = at_enc ^ prng_successor(nt, 96);
traceCrypto1 = lfsr_recovery64(ks2, ks3);
mf_crypto1_decrypt(traceCrypto1, data, len, 0);
PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );
crypto1_destroy(traceCrypto1);
return 0;
}