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This commit is contained in:
Philippe Teuwen 2021-10-16 23:44:46 +02:00
commit dbec6edfa7
14 changed files with 164 additions and 131 deletions
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tools/hitag2crack/crack4/ht2crack4.c
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@ -442,7 +442,7 @@ static void score_traces(struct guess *g, unsigned int size) {
// then shift by size - 16, insert upper key XOR enc_nonce XOR bitstream,
// and calc new bit b
uint64_t lfsr = (uid >> (size - 16)) | ((g->key << (48 - size)) ^
((nonces[i].enc_nR ^ g->b0to31[i]) << (64 - size)));
((nonces[i].enc_nR ^ g->b0to31[i]) << (64 - size)));
g->b0to31[i] = g->b0to31[i] | (ht2crypt(lfsr) << (size - 16));
// create lfsr - lower 16 bits are lower 16 bits of key