ADD: added a comment about the Q5, which I think is wrong in these commands. Needs...

[proxmark3-svn] / client / nonce2key / crapto1.c

diff --git a/client/nonce2key/crapto1.c b/client/nonce2key/crapto1.c
index 0339190f095dae2e19d887f2636eafe909e91601..c17cea7a5566922cae6563c1edea72ed3bf300be 100644 (file)
--- a/client/nonce2key/crapto1.c
+++ b/client/nonce2key/crapto1.c
@@ -383,7 +383,7 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb)
 /** nonce_distance\r
  * x,y valid tag nonces, then prng_successor(x, nonce_distance(x, y)) = y\r
  */\r
-static uint16_t *dist = 0;\r
+static uint16_t *dist;\r
 int nonce_distance(uint32_t from, uint32_t to)\r
 {\r
        uint16_t x, i;\r
@@ -391,7 +391,7 @@ int nonce_distance(uint32_t from, uint32_t to)
                dist = malloc(2 << 16);\r
                if(!dist)\r
                        return -1;\r
-               for (x = i = 1; i; ++i) {\r
+               for (x = 1, i = 1; i; ++i) {\r
                        dist[(x & 0xff) << 8 | x >> 8] = i;\r
                        x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;\r
                }\r
@@ -467,6 +467,24 @@ static struct Crypto1State* check_pfx_parity(uint32_t prefix, uint32_t rresp, ui
 \r
        return sl + good;\r
 }\r
+static struct Crypto1State* check_pfx_parity_ex(uint32_t prefix, uint32_t odd, uint32_t even, struct Crypto1State* sl) {\r
+       struct Crypto1State s;\r
+       uint32_t c = 0;\r
+\r
+       s.odd = odd ^ fastfwd[1][c];\r
+       s.even = even ^ fastfwd[0][c];\r
+       \r
+       lfsr_rollback_bit(&s, 0, 0);\r
+       lfsr_rollback_bit(&s, 0, 0);\r
+       lfsr_rollback_bit(&s, 0, 0);\r
+       \r
+       lfsr_rollback_word(&s, 0, 0);\r
+       lfsr_rollback_word(&s, prefix | c << 5, 1);\r
+       \r
+       sl->odd = s.odd;\r
+       sl->even = s.even;\r
+       return ++sl;\r
+}\r
 \r
 /** lfsr_common_prefix\r
  * Implentation of the common prefix attack.\r
@@ -507,3 +525,40 @@ out:
        free(even);\r
        return statelist;\r
 }\r
+\r
+struct Crypto1State* lfsr_common_prefix_ex(uint32_t pfx, uint8_t ks[8])\r
+{\r
+       struct Crypto1State *statelist, *s;\r
+       uint32_t *odd, *even, *o, *e, top;\r
+\r
+       odd = lfsr_prefix_ks(ks, 1);\r
+       even = lfsr_prefix_ks(ks, 0);\r
+\r
+       s = statelist = malloc((sizeof *statelist) << 20);\r
+       if(!s || !odd || !even) {\r
+               free(statelist);\r
+               statelist = 0;\r
+               goto out;\r
+       }\r
+\r
+       // for(o = odd; *o + 1; ++o)\r
+               // for(e = even; *e + 1; ++e)\r
+                       // for(top = 0; top < 64; ++top) {\r
+                               // *o += 1 << 21;\r
+                               // *e += (!(top & 7) + 1) << 21;\r
+                               // s = check_pfx_parity_ex(pfx, *o, *e, s);\r
+                       // }\r
+       for(o = odd; *o != -1; ++o)\r
+               for(e = even; *e != -1; ++e)\r
+                       for(top = 0; top < 64; ++top) {\r
+                               *o = (*o & 0x1fffff) | (top << 21);\r
+                               *e = (*e & 0x1fffff) | (top >> 3) << 21;\r
+                               s = check_pfx_parity_ex(pfx, *o, *e, s);\r
+                       }\r
+\r
+       s->odd = s->even = -1;  \r
+out:\r
+       free(odd);\r
+       free(even);\r
+       return statelist;\r
+}\r