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