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   1 /*  crypto1.c
   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 #include "crapto1.h"
  21 #include <stdlib.h>
  22
  23 void crypto1_create(struct Crypto1State *s, uint64_t key)
  24 {
  25 //      struct Crypto1State *s = malloc(sizeof(*s));
  26         int i;
  27
  28         for(i = 47;s && i > 0; i -= 2) {
  29                 s->odd  = s->odd  << 1 | BIT(key, (i - 1) ^ 7);
  30                 s->even = s->even << 1 | BIT(key, i ^ 7);
  31         }
  32 }
  33 void crypto1_destroy(struct Crypto1State *state)
  34 {
  35 //      free(state);
  36         state->odd = 0;
  37         state->even = 0;
  38 }
  39 void crypto1_get_lfsr(struct Crypto1State *state, uint64_t *lfsr)
  40 {
  41         int i;
  42         for(*lfsr = 0, i = 23; i >= 0; --i) {
  43                 *lfsr = *lfsr << 1 | BIT(state->odd, i ^ 3);
  44                 *lfsr = *lfsr << 1 | BIT(state->even, i ^ 3);
  45         }
  46 }
  47 uint8_t crypto1_bit(struct Crypto1State *s, uint8_t in, int is_encrypted)
  48 {
  49         uint32_t feedin;
  50         uint32_t tmp;
  51         uint8_t ret = filter(s->odd);
  52
  53         feedin  = ret & !!is_encrypted;
  54         feedin ^= !!in;
  55         feedin ^= LF_POLY_ODD & s->odd;
  56         feedin ^= LF_POLY_EVEN & s->even;
  57         s->even = s->even << 1 | parity(feedin);
  58
  59         tmp = s->odd;
  60         s->odd = s->even;
  61         s->even = tmp;
  62
  63         return ret;
  64 }
  65 uint8_t crypto1_byte(struct Crypto1State *s, uint8_t in, int is_encrypted)
  66 {
  67 /*
  68         uint8_t i, ret = 0;
  69
  70         for (i = 0; i < 8; ++i)
  71                 ret |= crypto1_bit(s, BIT(in, i), is_encrypted) << i;
  72 */
  73 // unfold loop 20161012
  74         uint8_t ret = 0;
  75         ret |= crypto1_bit(s, BIT(in, 0), is_encrypted) << 0;
  76         ret |= crypto1_bit(s, BIT(in, 1), is_encrypted) << 1;
  77         ret |= crypto1_bit(s, BIT(in, 2), is_encrypted) << 2;
  78         ret |= crypto1_bit(s, BIT(in, 3), is_encrypted) << 3;
  79         ret |= crypto1_bit(s, BIT(in, 4), is_encrypted) << 4;
  80         ret |= crypto1_bit(s, BIT(in, 5), is_encrypted) << 5;
  81         ret |= crypto1_bit(s, BIT(in, 6), is_encrypted) << 6;
  82         ret |= crypto1_bit(s, BIT(in, 7), is_encrypted) << 7;
  83         return ret;
  84 }
  85 uint32_t crypto1_word(struct Crypto1State *s, uint32_t in, int is_encrypted)
  86 {
  87 /*
  88         uint32_t i, ret = 0;
  89
  90         for (i = 0; i < 32; ++i)
  91                 ret |= crypto1_bit(s, BEBIT(in, i), is_encrypted) << (i ^ 24);
  92 */
  93 //unfold loop 2016012
  94         uint32_t ret = 0;
  95         ret |= crypto1_bit(s, BEBIT(in, 0), is_encrypted) << (0 ^ 24);
  96         ret |= crypto1_bit(s, BEBIT(in, 1), is_encrypted) << (1 ^ 24);
  97         ret |= crypto1_bit(s, BEBIT(in, 2), is_encrypted) << (2 ^ 24);
  98         ret |= crypto1_bit(s, BEBIT(in, 3), is_encrypted) << (3 ^ 24);
  99         ret |= crypto1_bit(s, BEBIT(in, 4), is_encrypted) << (4 ^ 24);
 100         ret |= crypto1_bit(s, BEBIT(in, 5), is_encrypted) << (5 ^ 24);
 101         ret |= crypto1_bit(s, BEBIT(in, 6), is_encrypted) << (6 ^ 24);
 102         ret |= crypto1_bit(s, BEBIT(in, 7), is_encrypted) << (7 ^ 24);
 103
 104         ret |= crypto1_bit(s, BEBIT(in, 8), is_encrypted) << (8 ^ 24);
 105         ret |= crypto1_bit(s, BEBIT(in, 9), is_encrypted) << (9 ^ 24);
 106         ret |= crypto1_bit(s, BEBIT(in, 10), is_encrypted) << (10 ^ 24);
 107         ret |= crypto1_bit(s, BEBIT(in, 11), is_encrypted) << (11 ^ 24);
 108         ret |= crypto1_bit(s, BEBIT(in, 12), is_encrypted) << (12 ^ 24);
 109         ret |= crypto1_bit(s, BEBIT(in, 13), is_encrypted) << (13 ^ 24);
 110         ret |= crypto1_bit(s, BEBIT(in, 14), is_encrypted) << (14 ^ 24);
 111         ret |= crypto1_bit(s, BEBIT(in, 15), is_encrypted) << (15 ^ 24);
 112
 113         ret |= crypto1_bit(s, BEBIT(in, 16), is_encrypted) << (16 ^ 24);
 114         ret |= crypto1_bit(s, BEBIT(in, 17), is_encrypted) << (17 ^ 24);
 115         ret |= crypto1_bit(s, BEBIT(in, 18), is_encrypted) << (18 ^ 24);
 116         ret |= crypto1_bit(s, BEBIT(in, 19), is_encrypted) << (19 ^ 24);
 117         ret |= crypto1_bit(s, BEBIT(in, 20), is_encrypted) << (20 ^ 24);
 118         ret |= crypto1_bit(s, BEBIT(in, 21), is_encrypted) << (21 ^ 24);
 119         ret |= crypto1_bit(s, BEBIT(in, 22), is_encrypted) << (22 ^ 24);
 120         ret |= crypto1_bit(s, BEBIT(in, 23), is_encrypted) << (23 ^ 24);
 121
 122         ret |= crypto1_bit(s, BEBIT(in, 24), is_encrypted) << (24 ^ 24);
 123         ret |= crypto1_bit(s, BEBIT(in, 25), is_encrypted) << (25 ^ 24);
 124         ret |= crypto1_bit(s, BEBIT(in, 26), is_encrypted) << (26 ^ 24);
 125         ret |= crypto1_bit(s, BEBIT(in, 27), is_encrypted) << (27 ^ 24);
 126         ret |= crypto1_bit(s, BEBIT(in, 28), is_encrypted) << (28 ^ 24);
 127         ret |= crypto1_bit(s, BEBIT(in, 29), is_encrypted) << (29 ^ 24);
 128         ret |= crypto1_bit(s, BEBIT(in, 30), is_encrypted) << (30 ^ 24);
 129         ret |= crypto1_bit(s, BEBIT(in, 31), is_encrypted) << (31 ^ 24);
 130         return ret;
 131 }
 132
 133 /* prng_successor
 134  * helper used to obscure the keystream during authentication
 135  */
 136 uint32_t prng_successor(uint32_t x, uint32_t n)
 137 {
 138         SWAPENDIAN(x);
 139         while(n--)
 140                 x = x >> 1 | (x >> 16 ^ x >> 18 ^ x >> 19 ^ x >> 21) << 31;
 141
 142         return SWAPENDIAN(x);
 143 }