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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
a0f33b66 18 Copyright (C) 2008-2014 bla <blapost@gmail.com>
f89c7050 19*/
a0f33b66 20#ifndef CRAPTO1_H__
21#define CRAPTO1_H__
f89c7050 22#include <stdint.h>
089d061f 23#include "bucketsort.h"
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24#ifdef __cplusplus
25extern "C" {
26#endif
27
28struct Crypto1State {uint32_t odd, even;};
29struct Crypto1State* crypto1_create(uint64_t);
30void crypto1_destroy(struct Crypto1State*);
31void crypto1_get_lfsr(struct Crypto1State*, uint64_t*);
32uint8_t crypto1_bit(struct Crypto1State*, uint8_t, int);
33uint8_t crypto1_byte(struct Crypto1State*, uint8_t, int);
34uint32_t crypto1_word(struct Crypto1State*, uint32_t, int);
35uint32_t prng_successor(uint32_t x, uint32_t n);
36
37struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
38struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
39uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
a0f33b66 40struct Crypto1State* lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
f89c7050 41
cd91e41c 42// douvan's no-parity function
43struct Crypto1State* lfsr_common_prefix_ex(uint32_t pfx, uint8_t ks[8]);
44
45
a0f33b66 46uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
47uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
48uint32_t lfsr_rollback_word(struct Crypto1State* s, uint32_t in, int fb);
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49int nonce_distance(uint32_t from, uint32_t to);
50#define SWAPENDIAN(x)\
51 (x = (x >> 8 & 0xff00ff) | (x & 0xff00ff) << 8, x = x >> 16 | x << 16)
a0f33b66 52
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53#define FOREACH_VALID_NONCE(N, FILTER, FSIZE)\
54 uint32_t __n = 0,__M = 0, N = 0;\
55 int __i;\
56 for(; __n < 1 << 16; N = prng_successor(__M = ++__n, 16))\
57 for(__i = FSIZE - 1; __i >= 0; __i--)\
58 if(BIT(FILTER, __i) ^ parity(__M & 0xFF01))\
59 break;\
60 else if(__i)\
61 __M = prng_successor(__M, (__i == 7) ? 48 : 8);\
62 else
63
64#define LF_POLY_ODD (0x29CE5C)
65#define LF_POLY_EVEN (0x870804)
66#define BIT(x, n) ((x) >> (n) & 1)
67#define BEBIT(x, n) BIT(x, (n) ^ 24)
68static inline int parity(uint32_t x)
69{
70#if !defined __i386__ || !defined __GNUC__
71 x ^= x >> 16;
72 x ^= x >> 8;
73 x ^= x >> 4;
74 return BIT(0x6996, x & 0xf);
75#else
8130eba4 76 __asm__( "movl %1, %%eax\n"
a0f33b66 77 "mov %%ax, %%cx\n"
78 "shrl $0x10, %%eax\n"
79 "xor %%ax, %%cx\n"
80 "xor %%ch, %%cl\n"
81 "setpo %%al\n"
82 "movzx %%al, %0\n": "=r"(x) : "r"(x): "eax","ecx");
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83 return x;
84#endif
85}
86static inline int filter(uint32_t const x)
87{
88 uint32_t f;
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89 f = 0xf22c0 >> (x & 0xf) & 16;
90 f |= 0x6c9c0 >> (x >> 4 & 0xf) & 8;
91 f |= 0x3c8b0 >> (x >> 8 & 0xf) & 4;
92 f |= 0x1e458 >> (x >> 12 & 0xf) & 2;
93 f |= 0x0d938 >> (x >> 16 & 0xf) & 1;
94 return BIT(0xEC57E80A, f);
95}
96#ifdef __cplusplus
97}
98#endif
99#endif
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