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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) 2008-2014 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 #if defined(__arm__)
29 void crypto1_create(struct Crypto1State *s, uint64_t key);
30 #else
31 struct Crypto1State *crypto1_create(uint64_t key);
32 #endif
33 void crypto1_destroy(struct Crypto1State*);
34 void crypto1_get_lfsr(struct Crypto1State*, uint64_t*);
35 uint8_t crypto1_bit(struct Crypto1State*, uint8_t, int);
36 uint8_t crypto1_byte(struct Crypto1State*, uint8_t, int);
37 uint32_t crypto1_word(struct Crypto1State*, uint32_t, int);
38 uint32_t prng_successor(uint32_t x, uint32_t n);
39
40 struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
41 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
42 uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
43 struct Crypto1State*
44 lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8], uint32_t no_par);
45
46
47 uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
48 uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
49 uint32_t lfsr_rollback_word(struct Crypto1State* s, uint32_t in, int fb);
50 int nonce_distance(uint32_t from, uint32_t to);
51 #define FOREACH_VALID_NONCE(N, FILTER, FSIZE)\
52 uint32_t __n = 0,__M = 0, N = 0;\
53 int __i;\
54 for(; __n < 1 << 16; N = prng_successor(__M = ++__n, 16))\
55 for(__i = FSIZE - 1; __i >= 0; __i--)\
56 if(BIT(FILTER, __i) ^ parity(__M & 0xFF01))\
57 break;\
58 else if(__i)\
59 __M = prng_successor(__M, (__i == 7) ? 48 : 8);\
60 else
61
62 #define LF_POLY_ODD (0x29CE5C)
63 #define LF_POLY_EVEN (0x870804)
64 #define BIT(x, n) ((x) >> (n) & 1)
65 #define BEBIT(x, n) BIT(x, (n) ^ 24)
66 static inline int parity(uint32_t x)
67 {
68 #if !defined __i386__ || !defined __GNUC__
69 x ^= x >> 16;
70 x ^= x >> 8;
71 x ^= x >> 4;
72 return BIT(0x6996, x & 0xf);
73 #else
74 __asm( "movl %1, %%eax\n"
75 "mov %%ax, %%cx\n"
76 "shrl $0x10, %%eax\n"
77 "xor %%ax, %%cx\n"
78 "xor %%ch, %%cl\n"
79 "setpo %%al\n"
80 "movzx %%al, %0\n": "=r"(x) : "r"(x): "eax","ecx");
81 return x;
82 #endif
83 }
84 static inline int filter(uint32_t const x)
85 {
86 uint32_t f;
87
88 f = 0xf22c0 >> (x & 0xf) & 16;
89 f |= 0x6c9c0 >> (x >> 4 & 0xf) & 8;
90 f |= 0x3c8b0 >> (x >> 8 & 0xf) & 4;
91 f |= 0x1e458 >> (x >> 12 & 0xf) & 2;
92 f |= 0x0d938 >> (x >> 16 & 0xf) & 1;
93 return BIT(0xEC57E80A, f);
94 }
95 #ifdef __cplusplus
96 }
97 #endif
98 #endif
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