git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/crypto1.c

   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
  24 void crypto1_create(struct Crypto1State *s, uint64_t key)
  25 {
  26 //      struct Crypto1State *s = malloc(sizeof(*s));
  27         int i;
  28
  29         for(i = 47;s && i > 0; i -= 2) {
  30                 s->odd  = s->odd  << 1 | BIT(key, (i - 1) ^ 7);
  31                 s->even = s->even << 1 | BIT(key, i ^ 7);
  32         }
  33         return;
  34 }
  35 void crypto1_destroy(struct Crypto1State *state)
  36 {
  37 //      free(state);
  38         state->odd = 0;
  39         state->even = 0;
  40 }
  41 void crypto1_get_lfsr(struct Crypto1State *state, uint64_t *lfsr)
  42 {
  43         int i;
  44         for(*lfsr = 0, i = 23; i >= 0; --i) {
  45                 *lfsr = *lfsr << 1 | BIT(state->odd, i ^ 3);
  46                 *lfsr = *lfsr << 1 | BIT(state->even, i ^ 3);
  47         }
  48 }
  49 uint8_t crypto1_bit(struct Crypto1State *s, uint8_t in, int is_encrypted)
  50 {
  51         uint32_t feedin;
  52         uint32_t tmp;
  53         uint8_t ret = filter(s->odd);
  54
  55         feedin  = ret & !!is_encrypted;
  56         feedin ^= !!in;
  57         feedin ^= LF_POLY_ODD & s->odd;
  58         feedin ^= LF_POLY_EVEN & s->even;
  59         s->even = s->even << 1 | parity(feedin);
  60
  61         tmp = s->odd;
  62         s->odd = s->even;
  63         s->even = tmp;
  64
  65         return ret;
  66 }
  67 uint8_t crypto1_byte(struct Crypto1State *s, uint8_t in, int is_encrypted)
  68 {
  69 /*
  70         uint8_t i, ret = 0;
  71
  72         for (i = 0; i < 8; ++i)
  73                 ret |= crypto1_bit(s, BIT(in, i), is_encrypted) << i;
  74 */
  75 // unfold loop 20161012
  76         uint8_t ret = 0;
  77         ret |= crypto1_bit(s, BIT(in, 0), is_encrypted) << 0;
  78         ret |= crypto1_bit(s, BIT(in, 1), is_encrypted) << 1;
  79         ret |= crypto1_bit(s, BIT(in, 2), is_encrypted) << 2;
  80         ret |= crypto1_bit(s, BIT(in, 3), is_encrypted) << 3;
  81         ret |= crypto1_bit(s, BIT(in, 4), is_encrypted) << 4;
  82         ret |= crypto1_bit(s, BIT(in, 5), is_encrypted) << 5;
  83         ret |= crypto1_bit(s, BIT(in, 6), is_encrypted) << 6;
  84         ret |= crypto1_bit(s, BIT(in, 7), is_encrypted) << 7;
  85         return ret;
  86 }
  87 uint32_t crypto1_word(struct Crypto1State *s, uint32_t in, int is_encrypted)
  88 {
  89 /*
  90         uint32_t i, ret = 0;
  91
  92         for (i = 0; i < 32; ++i)
  93                 ret |= crypto1_bit(s, BEBIT(in, i), is_encrypted) << (i ^ 24);
  94 */
  95 //unfold loop 2016012
  96         uint32_t ret = 0;
  97         ret |= crypto1_bit(s, BEBIT(in, 0), is_encrypted) << (0 ^ 24);
  98         ret |= crypto1_bit(s, BEBIT(in, 1), is_encrypted) << (1 ^ 24);
  99         ret |= crypto1_bit(s, BEBIT(in, 2), is_encrypted) << (2 ^ 24);
 100         ret |= crypto1_bit(s, BEBIT(in, 3), is_encrypted) << (3 ^ 24);
 101         ret |= crypto1_bit(s, BEBIT(in, 4), is_encrypted) << (4 ^ 24);
 102         ret |= crypto1_bit(s, BEBIT(in, 5), is_encrypted) << (5 ^ 24);
 103         ret |= crypto1_bit(s, BEBIT(in, 6), is_encrypted) << (6 ^ 24);
 104         ret |= crypto1_bit(s, BEBIT(in, 7), is_encrypted) << (7 ^ 24);
 105
 106         ret |= crypto1_bit(s, BEBIT(in, 8), is_encrypted) << (8 ^ 24);
 107         ret |= crypto1_bit(s, BEBIT(in, 9), is_encrypted) << (9 ^ 24);
 108         ret |= crypto1_bit(s, BEBIT(in, 10), is_encrypted) << (10 ^ 24);
 109         ret |= crypto1_bit(s, BEBIT(in, 11), is_encrypted) << (11 ^ 24);
 110         ret |= crypto1_bit(s, BEBIT(in, 12), is_encrypted) << (12 ^ 24);
 111         ret |= crypto1_bit(s, BEBIT(in, 13), is_encrypted) << (13 ^ 24);
 112         ret |= crypto1_bit(s, BEBIT(in, 14), is_encrypted) << (14 ^ 24);
 113         ret |= crypto1_bit(s, BEBIT(in, 15), is_encrypted) << (15 ^ 24);
 114
 115         ret |= crypto1_bit(s, BEBIT(in, 16), is_encrypted) << (16 ^ 24);
 116         ret |= crypto1_bit(s, BEBIT(in, 17), is_encrypted) << (17 ^ 24);
 117         ret |= crypto1_bit(s, BEBIT(in, 18), is_encrypted) << (18 ^ 24);
 118         ret |= crypto1_bit(s, BEBIT(in, 19), is_encrypted) << (19 ^ 24);
 119         ret |= crypto1_bit(s, BEBIT(in, 20), is_encrypted) << (20 ^ 24);
 120         ret |= crypto1_bit(s, BEBIT(in, 21), is_encrypted) << (21 ^ 24);
 121         ret |= crypto1_bit(s, BEBIT(in, 22), is_encrypted) << (22 ^ 24);
 122         ret |= crypto1_bit(s, BEBIT(in, 23), is_encrypted) << (23 ^ 24);
 123
 124         ret |= crypto1_bit(s, BEBIT(in, 24), is_encrypted) << (24 ^ 24);
 125         ret |= crypto1_bit(s, BEBIT(in, 25), is_encrypted) << (25 ^ 24);
 126         ret |= crypto1_bit(s, BEBIT(in, 26), is_encrypted) << (26 ^ 24);
 127         ret |= crypto1_bit(s, BEBIT(in, 27), is_encrypted) << (27 ^ 24);
 128         ret |= crypto1_bit(s, BEBIT(in, 28), is_encrypted) << (28 ^ 24);
 129         ret |= crypto1_bit(s, BEBIT(in, 29), is_encrypted) << (29 ^ 24);
 130         ret |= crypto1_bit(s, BEBIT(in, 30), is_encrypted) << (30 ^ 24);
 131         ret |= crypto1_bit(s, BEBIT(in, 31), is_encrypted) << (31 ^ 24);
 132         return ret;
 133 }
 134
 135 /* prng_successor
 136  * helper used to obscure the keystream during authentication
 137  */
 138 uint32_t prng_successor(uint32_t x, uint32_t n)
 139 {
 140         SWAPENDIAN(x);
 141         while(n--)
 142                 x = x >> 1 | (x >> 16 ^ x >> 18 ^ x >> 19 ^ x >> 21) << 31;
 143
 144         return SWAPENDIAN(x);
 145 }