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   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 uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
  43 uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
  44 uint32_t lfsr_rollback_word(struct Crypto1State* s, uint32_t in, int fb);
  45 int nonce_distance(uint32_t from, uint32_t to);
  46 #define FOREACH_VALID_NONCE(N, FILTER, FSIZE)\
  47         uint32_t __n = 0,__M = 0, N = 0;\
  48         int __i;\
  49         for(; __n < 1 << 16; N = prng_successor(__M = ++__n, 16))\
  50                 for(__i = FSIZE - 1; __i >= 0; __i--)\
  51                         if(BIT(FILTER, __i) ^ parity(__M & 0xFF01))\
  52                                 break;\
  53                         else if(__i)\
  54                                 __M = prng_successor(__M, (__i == 7) ? 48 : 8);\
  55                         else
  56
  57 #define LF_POLY_ODD (0x29CE5C)
  58 #define LF_POLY_EVEN (0x870804)
  59 #define BIT(x, n) ((x) >> (n) & 1)
  60 #define BEBIT(x, n) BIT(x, (n) ^ 24)
  61 static inline int parity(uint32_t x)
  62 {
  63 #if !defined __i386__ || !defined __GNUC__
  64         x ^= x >> 16;
  65         x ^= x >> 8;
  66         x ^= x >> 4;
  67         return BIT(0x6996, x & 0xf);
  68 #else
  69         asm(    "movl %1, %%eax\n"
  70                 "mov %%ax, %%cx\n"
  71                 "shrl $0x10, %%eax\n"
  72                 "xor %%ax, %%cx\n"
  73                 "xor %%ch, %%cl\n"
  74                 "setpo %%al\n"
  75                 "movzx %%al, %0\n": "=r"(x) : "r"(x): "eax","ecx");
  76         return x;
  77 #endif
  78 }
  79 static inline int filter(uint32_t const x)
  80 {
  81         uint32_t f;
  82
  83         f  = 0xf22c0 >> (x       & 0xf) & 16;
  84         f |= 0x6c9c0 >> (x >>  4 & 0xf) &  8;
  85         f |= 0x3c8b0 >> (x >>  8 & 0xf) &  4;
  86         f |= 0x1e458 >> (x >> 12 & 0xf) &  2;
  87         f |= 0x0d938 >> (x >> 16 & 0xf) &  1;
  88         return BIT(0xEC57E80A, f);
  89 }
  90 #ifdef __cplusplus
  91 }
  92 #endif
  93 #endif