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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 "mifare.h"

16 #include "crapto1/crapto1.h"

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

 bool mfkey32(nonces_t data, uint64_t *outputkey) {

21 struct Crypto1State *s,*t;

22 uint64_t outkey = 0;

         uint64_t key = 0;     // recovered key

24 bool isSuccess = false;

25 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);

33 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))) {

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

38 outkey = key;

39 counter++;

                         if (counter == 20) break;

41 }

42 }

43 isSuccess = (counter == 1);

         *outputkey = ( isSuccess ) ? outkey : 0;

45 crypto1_destroy(s);

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

47 FILE *fout;

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

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

50 return 1;

51 }

52 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);

53 fclose(fout);

54 */

55 return isSuccess;

56 }

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

 bool mfkey32_moebius(nonces_t data, uint64_t *outputkey) {

60 struct Crypto1State *s, *t;

61 uint64_t outkey = 0;

         uint64_t key       = 0;                 // recovered key

63 bool isSuccess = false;

64 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);

72 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))) {

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

78 outkey=key;

79 ++counter;

                         if (counter==20)

81 break;

82 }

83 }

84 isSuccess = (counter == 1);

         *outputkey = ( isSuccess ) ? outkey : 0;

86 crypto1_destroy(s);

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

88 FILE *fout;

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

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

91 return 1;

92 }

93 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);

94 fclose(fout);

95 */

96 return isSuccess;

97 }

99 // 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

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

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

104 struct Crypto1State *revstate;

105

106 // 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);

114 crypto1_get_lfsr(revstate, &key);

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

116 crypto1_destroy(revstate);

117 *outputkey = key;

118

119 return 0;

120 }

121

122