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1 //-----------------------------------------------------------------------------

2 // Merlok - June 2011

3 // Roel - Dec 2009

4 // Unknown author

5 //

6 // This code is licensed to you under the terms of the GNU GPL, version 2 or,

7 // at your option, any later version. See the LICENSE.txt file for the text of

8 // the license.

9 //-----------------------------------------------------------------------------

10 // MIFARE Darkside hack

11 //-----------------------------------------------------------------------------

13 #include "mfkey.h"

15 #include "crapto1/crapto1.h"

18 // recover key from 2 different reader responses on same tag challenge

 bool mfkey32(nonces_t data, uint64_t *outputkey) {

20 struct Crypto1State *s,*t;

21 uint64_t outkey = 0;

         uint64_t key = 0;     // recovered key

23 bool isSuccess = false;

24 uint8_t counter = 0;

         s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);

         for(t = s; t->odd | t->even; ++t) {

                 lfsr_rollback_word(t, 0, 0);

                 lfsr_rollback_word(t, data.nr, 1);

                 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);

32 crypto1_get_lfsr(t, &key);

                 crypto1_word(t, data.cuid ^ data.nonce, 0);

                 crypto1_word(t, data.nr2, 1);

                 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce, 64))) {

36 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);

37 outkey = key;

38 counter++;

                         if (counter == 20) break;

40 }

41 }

42 isSuccess = (counter == 1);

         *outputkey = ( isSuccess ) ? outkey : 0;

44 crypto1_destroy(s);

45 /* //un-comment to save all keys to a stats.txt file

46 FILE *fout;

47 if ((fout = fopen("stats.txt","ab")) == NULL) {

48 PrintAndLog("Could not create file name stats.txt");

49 return 1;

50 }

51 fprintf(fout, "mfkey32,%d,%08x,%d,%s,%04x%08x,%.0Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t)(outkey>>32) & 0xFFFF,(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);

52 fclose(fout);

53 */

54 return isSuccess;

55 }

57 // recover key from 2 reader responses on 2 different tag challenges

 bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {

59 struct Crypto1State *s, *t;

60 uint64_t outkey = 0;

         uint64_t key       = 0;                 // recovered key

62 bool isSuccess = false;

63 int counter = 0;

         s = lfsr_recovery32(data.ar ^ prng_successor(data.nonce, 64), 0);

         for(t = s; t->odd | t->even; ++t) {

                 lfsr_rollback_word(t, 0, 0);

                 lfsr_rollback_word(t, data.nr, 1);

                 lfsr_rollback_word(t, data.cuid ^ data.nonce, 0);

71 crypto1_get_lfsr(t, &key);

                 crypto1_word(t, data.cuid ^ data.nonce2, 0);

                 crypto1_word(t, data.nr2, 1);

                 if (data.ar2 == (crypto1_word(t, 0, 0) ^ prng_successor(data.nonce2, 64))) {

76 //PrintAndLog("Found Key: [%012" PRIx64 "]",key);

77 outkey=key;

78 ++counter;

                         if (counter==20)

80 break;

81 }

82 }

83 isSuccess = (counter == 1);

         *outputkey = ( isSuccess ) ? outkey : 0;

85 crypto1_destroy(s);

86 /* // un-comment to output all keys to stats.txt

87 FILE *fout;

88 if ((fout = fopen("stats.txt","ab")) == NULL) {

89 PrintAndLog("Could not create file name stats.txt");

90 return 1;

91 }

92 fprintf(fout, "moebius,%d,%08x,%d,%s,%04x%08x,%0.Lf\r\n", counter, data.cuid, data.sector, (data.keytype) ? "B" : "A", (uint32_t) (outkey>>32),(uint32_t)(outkey&0xFFFFFFFF),(long double)t1);

93 fclose(fout);

94 */

95 return isSuccess;

96 }

98 // recover key from reader response and tag response of one authentication sequence

 int mfkey64(nonces_t data, uint64_t *outputkey){

         uint64_t key    = 0;                            // recovered key

101 uint32_t ks2; // keystream used to encrypt reader response

102 uint32_t ks3; // keystream used to encrypt tag response

103 struct Crypto1State *revstate;

104

105 // Extract the keystream from the messages

         ks2 = data.ar ^ prng_successor(data.nonce, 64);

         ks3 = data.at ^ prng_successor(data.nonce, 96);

         revstate = lfsr_recovery64(ks2, ks3);

         lfsr_rollback_word(revstate, 0, 0);

         lfsr_rollback_word(revstate, 0, 0);

         lfsr_rollback_word(revstate, data.nr, 1);

         lfsr_rollback_word(revstate, data.cuid ^ data.nonce, 0);

113 crypto1_get_lfsr(revstate, &key);

114 // PrintAndLog("Found Key: [%012" PRIx64 "]", key);

115 crypto1_destroy(revstate);

116 *outputkey = key;

117

118 return 0;

119 }

120

121