cvs.zerfleddert.de Git - proxmark3-svn/blob - client/nonce2key/crapto1.h

   1 /*  crapto1.h
   2
   3     This program is free software; you can redistribute it and/or
   4     modify it under the terms of the GNU General Public License
   5     as published by the Free Software Foundation; either version 2
   6     of the License, or (at your option) any later version.
   7
   8     This program is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11     GNU General Public License for more details.
  12
  13     You should have received a copy of the GNU General Public License
  14     along with this program; if not, write to the Free Software
  15     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  16     MA  02110-1301, US$
  17
  18     Copyright (C) 2008-2008 bla <blapost@gmail.com>
  19 */
  20 #ifndef CRAPTO1_INCLUDED
  21 #define CRAPTO1_INCLUDED
  22 #include <stdint.h>
  23 #ifdef __cplusplus
  24 extern "C" {
  25 #endif
  26
  27 struct Crypto1State {uint32_t odd, even;};
  28 struct Crypto1State* crypto1_create(uint64_t);
  29 void crypto1_destroy(struct Crypto1State*);
  30 void crypto1_get_lfsr(struct Crypto1State*, uint64_t*);
  31 uint8_t crypto1_bit(struct Crypto1State*, uint8_t, int);
  32 uint8_t crypto1_byte(struct Crypto1State*, uint8_t, int);
  33 uint32_t crypto1_word(struct Crypto1State*, uint32_t, int);
  34 uint32_t prng_successor(uint32_t x, uint32_t n);
  35
  36 struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
  37 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
  38 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
  39 struct Crypto1State*
  40 lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
  41
  42
  43 void lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
  44 void lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
  45 void lfsr_rollback_word(struct Crypto1State* s, uint32_t in, int fb);
  46 int nonce_distance(uint32_t from, uint32_t to);
  47 #define SWAPENDIAN(x)\
  48         (x = (x >> 8 & 0xff00ff) | (x & 0xff00ff) << 8, x = x >> 16 | x << 16)
  49
  50 #define FOREACH_VALID_NONCE(N, FILTER, FSIZE)\
  51         uint32_t __n = 0,__M = 0, N = 0;\
  52         int __i;\
  53         for(; __n < 1 << 16; N = prng_successor(__M = ++__n, 16))\
  54                 for(__i = FSIZE - 1; __i >= 0; __i--)\
  55                         if(BIT(FILTER, __i) ^ parity(__M & 0xFF01))\
  56                                 break;\
  57                         else if(__i)\
  58                                 __M = prng_successor(__M, (__i == 7) ? 48 : 8);\
  59                         else
  60
  61 #define LF_POLY_ODD (0x29CE5C)
  62 #define LF_POLY_EVEN (0x870804)
  63 #define BIT(x, n) ((x) >> (n) & 1)
  64 #define BEBIT(x, n) BIT(x, (n) ^ 24)
  65 static inline int parity(uint32_t x)
  66 {
  67 #if !defined __i386__ || !defined __GNUC__
  68         x ^= x >> 16;
  69         x ^= x >> 8;
  70         x ^= x >> 4;
  71         return BIT(0x6996, x & 0xf);
  72 #else
  73         __asm(    "movl %1, %%eax\n"
  74                 "mov %%ax, %%cx\n"
  75                 "shrl $0x10, %%eax\n"
  76                 "xor %%ax, %%cx\n"
  77                 "xor %%ch, %%cl\n"
  78                 "setpo %%al\n"
  79                 "movzx %%al, %0\n": "=r"(x) : "r"(x): "eax","ecx");
  80         return x;
  81 #endif
  82 }
  83 static inline int filter(uint32_t const x)
  84 {
  85         uint32_t f;
  86
  87         f  = 0xf22c0 >> (x       & 0xf) & 16;
  88         f |= 0x6c9c0 >> (x >>  4 & 0xf) &  8;
  89         f |= 0x3c8b0 >> (x >>  8 & 0xf) &  4;
  90         f |= 0x1e458 >> (x >> 12 & 0xf) &  2;
  91         f |= 0x0d938 >> (x >> 16 & 0xf) &  1;
  92         return BIT(0xEC57E80A, f);
  93 }
  94 #ifdef __cplusplus
  95 }
  96 #endif
  97 #endif