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69 lines
2 KiB
C
69 lines
2 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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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#define llx PRIx64
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#include "nonce2key.h"
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#include "ui.h"
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int nonce2key(uint32_t uid, uint32_t nt, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
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struct Crypto1State *state, *state_s;
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uint32_t pos, nr, rr, nr_diff;//, ks1, ks2;
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byte_t bt, i, ks3x[8], par[8][8];
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uint64_t key_recovered;
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nr = rr = 0;
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// Reset the last three significant bits of the reader nonce
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nr &= 0xffffff1f;
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PrintAndLog("\nuid(%08x) nt(%08x) par(%016"llx") ks(%016"llx")\n\n",uid,nt,par_info,ks_info);
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for (pos=0; pos<8; pos++)
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{
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ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
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bt = (par_info >> (pos*8)) & 0xff;
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for (i=0; i<8; i++)
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{
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par[7-pos][i] = (bt >> i) & 0x01;
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}
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}
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printf("|diff|{nr} |ks3|ks3^5|parity |\n");
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printf("+----+--------+---+-----+---------------+\n");
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for (i=0; i<8; i++)
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{
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nr_diff = nr | i << 5;
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printf("| %02x |%08x|",i << 5, nr_diff);
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printf(" %01x | %01x |",ks3x[i], ks3x[i]^5);
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for (pos=0; pos<7; pos++) printf("%01x,", par[i][pos]);
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printf("%01x|\n", par[i][7]);
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}
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state = lfsr_common_prefix(nr, rr, ks3x, par);
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state_s = 0;
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for (i = 0; (state) && ((state + i)->odd != 0 || (state + i)->even != 0) && (i < 10); i++)
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{
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printf("%08x|%08x\n",(state+i)->odd, (state+i)->even);
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state_s = state + i;
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}
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if (!state_s) return 1;
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lfsr_rollback_word(state_s, uid^nt, 0);
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crypto1_get_lfsr(state_s, &key_recovered);
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if (!state) free(state);
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*key = key_recovered;
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return 0;
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}
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