./mfkey64 9c599b32 82a4166c a1e458ce 6eea41e0 5cadf439
+
+
+### Communication decryption
+
+
+RDR 26
+TAG 04 00
+RDR 93 20
+TAG 14 57 9f 69 b5
+RDR 93 70 14 57 9f 69 b5 2e 51
+TAG 08 b6 dd
+RDR 60 14 50 2d
+TAG ce 84 42 61
+RDR f8 04 9c cb 05 25 c8 4f
+TAG 94 31 cc 40
+RDR 70 93 df 99
+TAG 99 72 42 8c e2 e8 52 3f 45 6b 99 c8 31 e7 69 dc ed 09
+RDR 8c a6 82 7b
+TAG ab 79 7f d3 69 e8 b9 3a 86 77 6b 40 da e3 ef 68 6e fd
+RDR c3 c3 81 ba
+TAG 49 e2 c9 de f4 86 8d 17 77 67 0e 58 4c 27 23 02 86 f4
+RDR fb dc d7 c1
+TAG 4a bd 96 4b 07 d3 56 3a a0 66 ed 0a 2e ac 7f 63 12 bf
+RDR 9f 91 49 ea
+
+
+./mfkey64 14579f69 ce844261 f8049ccb 0525c84f 9431cc40 7093df99 9972428ce2e8523f456b99c831e769dced09 8ca6827b ab797fd369e8b93a86776b40dae3ef686efd c3c381ba 49e2c9def4868d1777670e584c27230286f4 fbdcd7c1 4abd964b07d3563aa066ed0a2eac7f6312bf 9f9149ea
+
+Recovering key for:
+ uid: 14579f69
+ nt: ce844261
+ {nr}: f8049ccb
+ {ar}: 0525c84f
+ {at}: 9431cc40
+{enc0}: 7093df99
+{enc1}: 9972428ce2e8523f456b99c831e769dced09
+{enc2}: 8ca6827b
+{enc3}: ab797fd369e8b93a86776b40dae3ef686efd
+{enc4}: c3c381ba
+{enc5}: 49e2c9def4868d1777670e584c27230286f4
+{enc6}: fbdcd7c1
+{enc7}: 4abd964b07d3563aa066ed0a2eac7f6312bf
+{enc8}: 9f9149ea
+
+LFSR succesors of the tag challenge:
+ nt': 76d4468d
+ nt'': d5f3c476
+
+Keystream used to generate {ar} and {at}:
+ ks2: 73f18ec2
+ ks3: 41c20836
+
+Decrypted communication:
+{dec0}: 3014a7fe
+{dec1}: c26935cfdb95c4b4a27a84b8217ae9e48217
+{dec2}: 30152eef
+{dec3}: 493167c536c30f8e220b09675687067d4b31
+{dec4}: 3016b5dd
+{dec5}: 493167c536c30f8e220b09675687067d4b31
+{dec6}: 30173ccc
+{dec7}: 0000000000007e178869000000000000c4f2
+{dec8}: 61148834
+
+Found Key: [091e639cb715]
\ No newline at end of file
// Test-file: test2.c
#include "crapto1.h"
#include <stdio.h>
+#include <string.h>
int main (int argc, char *argv[]) {
struct Crypto1State *revstate;
printf("MIFARE Classic key recovery - based 64 bits of keystream\n");
printf("Recover key from only one complete authentication!\n\n");
- if (argc < 6) {
- printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}>\n\n",argv[0]);
+ if (argc < 6 ) {
+ printf(" syntax: %s <uid> <nt> <{nr}> <{ar}> <{at}> [enc] [enc...]\n\n", argv[0]);
return 1;
}
- sscanf(argv[1],"%x",&uid);
- sscanf(argv[2],"%x",&nt);
- sscanf(argv[3],"%x",&nr_enc);
- sscanf(argv[4],"%x",&ar_enc);
- sscanf(argv[5],"%x",&at_enc);
+ int encc = argc - 6;
+ int enclen[encc];
+ uint8_t enc[encc][120];
+ sscanf(argv[1], "%x", &uid);
+ sscanf(argv[2], "%x", &nt);
+ sscanf(argv[3], "%x", &nr_enc);
+ sscanf(argv[4], "%x", &ar_enc);
+ sscanf(argv[5], "%x", &at_enc);
+ for (int i = 0; i < encc; i++) {
+ enclen[i] = strlen(argv[i + 6]) / 2;
+ for (int i2 = 0; i2 < enclen[i]; i2++) {
+ sscanf(argv[i+6] + i2*2,"%2x", (uint8_t*)&enc[i][i2]);
+ }
+ }
printf("Recovering key for:\n");
- printf(" uid: %08x\n",uid);
- printf(" nt: %08x\n",nt);
- printf(" {nr}: %08x\n",nr_enc);
- printf(" {ar}: %08x\n",ar_enc);
- printf(" {at}: %08x\n",at_enc);
-/*
+ printf(" uid: %08x\n", uid);
+ printf(" nt: %08x\n", nt);
+ printf(" {nr}: %08x\n", nr_enc);
+ printf(" {ar}: %08x\n", ar_enc);
+ printf(" {at}: %08x\n", at_enc);
+ for (int i = 0; i < encc; i++) {
+ printf("{enc%d}: ", i);
+ for (int i2 = 0; i2 < enclen[i]; i2++) {
+ printf("%02x", enc[i][i2]);
+ }
+ printf("\n");
+ }
+
+
+ /*
uint32_t uid = 0x9c599b32;
uint32_t tag_challenge = 0x82a4166c;
uint32_t nr_enc = 0xa1e458ce;
uint32_t reader_response = 0x6eea41e0;
uint32_t tag_response = 0x5cadf439;
*/
- // Generate lfsr succesors of the tag challenge
+ // Generate lfsr succesors of the tag challenge
printf("\nLFSR succesors of the tag challenge:\n");
printf(" nt': %08x\n",prng_successor(nt, 64));
printf(" nt'': %08x\n",prng_successor(nt, 96));
printf(" ks3: %08x\n",ks3);
revstate = lfsr_recovery64(ks2, ks3);
+
+ // Decrypting communication using keystream if presented
+ if (argc > 6 ) {
+ printf("\nDecrypted communication:\n");
+ uint8_t ks4;
+ int rollb = 0;
+ for (int i = 0; i < encc; i++) {
+ printf("{dec%d}: ", i);
+ for (int i2 = 0; i2 < enclen[i]; i2++) {
+ ks4 = crypto1_byte(revstate, 0, 0);
+ printf("%02x", ks4 ^ enc[i][i2]);
+ rollb += 1;
+ }
+ printf("\n");
+ }
+ for (int i = 0; i < rollb; i++) {
+ lfsr_rollback_byte(revstate, 0, 0);
+ }
+ }
+
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, nr_enc, 1);