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- /* crapto1.h
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- MA 02110-1301, US$
-
- Copyright (C) 2008-2009 bla <blapost@gmail.com>
- */
- #ifndef CRAPTO1_INCLUDED
- #define CRAPTO1_INCLUDED
- #include <stdint.h>
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- struct Crypto1State {uint32_t odd, even;};
- struct Crypto1State *crypto1_create(uint64_t);
- void crypto1_destroy(struct Crypto1State *);
- void crypto1_get_lfsr(struct Crypto1State *, uint64_t *);
- uint8_t crypto1_bit(struct Crypto1State *, uint8_t, int);
- uint8_t crypto1_byte(struct Crypto1State *, uint8_t, int);
- uint32_t crypto1_word(struct Crypto1State *, uint32_t, int);
- uint32_t prng_successor(uint32_t x, uint32_t n);
-
- struct Crypto1State *lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
- struct Crypto1State *lfsr_recovery32(uint32_t ks2, uint32_t in);
- struct Crypto1State *lfsr_recovery64(uint32_t ks2, uint32_t ks3);
-
- void lfsr_rollback(struct Crypto1State *s, uint32_t in, int fb);
- uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb);
- int nonce_distance(uint32_t from, uint32_t to);
- #define FOREACH_VALID_NONCE(N, FILTER, FSIZE)\
- uint32_t __n = 0,__M = 0, N = 0;\
- int __i;\
- for(; __n < 1 << 16; N = prng_successor(__M = ++__n, 16))\
- for(__i = FSIZE - 1; __i >= 0; __i--)\
- if(BIT(FILTER, __i) ^ parity(__M & 0xFF01))\
- break;\
- else if(__i)\
- __M = prng_successor(__M, (__i == 7) ? 48 : 8);\
- else
-
- #define LF_POLY_ODD (0x29CE5C)
- #define LF_POLY_EVEN (0x870804)
- #define BIT(x, n) ((x) >> (n) & 1)
- #define BEBIT(x, n) BIT(x, (n) ^ 24)
- static inline int parity(uint32_t x)
- {
- #if !defined __i386__ || !defined __GNUC__
- x ^= x >> 16;
- x ^= x >> 8;
- x ^= x >> 4;
- return BIT(0x6996, x & 0xf);
- #else
- __asm__("movl %1, %%eax\n"
- "mov %%ax, %%cx\n"
- "shrl $0x10, %%eax\n"
- "xor %%ax, %%cx\n"
- "xor %%ch, %%cl\n"
- "setpo %%al\n"
- "movzx %%al, %0\n": "=r"(x) : "r"(x): "eax", "ecx");
- return x;
- #endif
- }
- static inline int filter(uint32_t const x)
- {
- uint32_t f;
-
- f = 0xf22c0 >> (x & 0xf) & 16;
- f |= 0x6c9c0 >> (x >> 4 & 0xf) & 8;
- f |= 0x3c8b0 >> (x >> 8 & 0xf) & 4;
- f |= 0x1e458 >> (x >> 12 & 0xf) & 2;
- f |= 0x0d938 >> (x >> 16 & 0xf) & 1;
- return BIT(0xEC57E80A, f);
- }
- #ifdef __cplusplus
- }
- #endif
- #endif
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