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cvs.zerfleddert.de Git - proxmark3-svn/blob - client/nonce2key/crypto1.c
ba297b8df262a7ff2510b73dd5e8e6b332a74296
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.
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.
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,
18 Copyright (C) 2008-2008 bla <blapost@gmail.com>
23 struct Crypto1State
* crypto1_create(uint64_t key
)
25 struct Crypto1State
*s
= malloc(sizeof(*s
));
26 if ( !s
) return NULL
;
29 //for(i = 47;s && i > 0; i -= 2) {
30 for(i
= 47; i
> 0; i
-= 2) {
31 s
->odd
= s
->odd
<< 1 | BIT(key
, (i
- 1) ^ 7);
32 s
->even
= s
->even
<< 1 | BIT(key
, i
^ 7);
36 void crypto1_destroy(struct Crypto1State
*state
)
40 void crypto1_get_lfsr(struct Crypto1State
*state
, uint64_t *lfsr
)
43 for(*lfsr
= 0, i
= 23; i
>= 0; --i
) {
44 *lfsr
= *lfsr
<< 1 | BIT(state
->odd
, i
^ 3);
45 *lfsr
= *lfsr
<< 1 | BIT(state
->even
, i
^ 3);
48 uint8_t crypto1_bit(struct Crypto1State
*s
, uint8_t in
, int is_encrypted
)
52 uint8_t ret
= filter(s
->odd
);
54 feedin
= ret
& !!is_encrypted
;
56 feedin
^= LF_POLY_ODD
& s
->odd
;
57 feedin
^= LF_POLY_EVEN
& s
->even
;
58 s
->even
= s
->even
<< 1 | parity(feedin
);
66 uint8_t crypto1_byte(struct Crypto1State
*s
, uint8_t in
, int is_encrypted
)
71 for (i = 0; i < 8; ++i)
72 ret |= crypto1_bit(s, BIT(in, i), is_encrypted) << i;
74 // unfold loop 20161012
76 ret
|= crypto1_bit(s
, BIT(in
, 0), is_encrypted
) << 0;
77 ret
|= crypto1_bit(s
, BIT(in
, 1), is_encrypted
) << 1;
78 ret
|= crypto1_bit(s
, BIT(in
, 2), is_encrypted
) << 2;
79 ret
|= crypto1_bit(s
, BIT(in
, 3), is_encrypted
) << 3;
80 ret
|= crypto1_bit(s
, BIT(in
, 4), is_encrypted
) << 4;
81 ret
|= crypto1_bit(s
, BIT(in
, 5), is_encrypted
) << 5;
82 ret
|= crypto1_bit(s
, BIT(in
, 6), is_encrypted
) << 6;
83 ret
|= crypto1_bit(s
, BIT(in
, 7), is_encrypted
) << 7;
86 uint32_t crypto1_word(struct Crypto1State
*s
, uint32_t in
, int is_encrypted
)
91 for (i = 0; i < 32; ++i)
92 ret |= crypto1_bit(s, BEBIT(in, i), is_encrypted) << (i ^ 24);
96 ret
|= crypto1_bit(s
, BEBIT(in
, 0), is_encrypted
) << (0 ^ 24);
97 ret
|= crypto1_bit(s
, BEBIT(in
, 1), is_encrypted
) << (1 ^ 24);
98 ret
|= crypto1_bit(s
, BEBIT(in
, 2), is_encrypted
) << (2 ^ 24);
99 ret
|= crypto1_bit(s
, BEBIT(in
, 3), is_encrypted
) << (3 ^ 24);
100 ret
|= crypto1_bit(s
, BEBIT(in
, 4), is_encrypted
) << (4 ^ 24);
101 ret
|= crypto1_bit(s
, BEBIT(in
, 5), is_encrypted
) << (5 ^ 24);
102 ret
|= crypto1_bit(s
, BEBIT(in
, 6), is_encrypted
) << (6 ^ 24);
103 ret
|= crypto1_bit(s
, BEBIT(in
, 7), is_encrypted
) << (7 ^ 24);
105 ret
|= crypto1_bit(s
, BEBIT(in
, 8), is_encrypted
) << (8 ^ 24);
106 ret
|= crypto1_bit(s
, BEBIT(in
, 9), is_encrypted
) << (9 ^ 24);
107 ret
|= crypto1_bit(s
, BEBIT(in
, 10), is_encrypted
) << (10 ^ 24);
108 ret
|= crypto1_bit(s
, BEBIT(in
, 11), is_encrypted
) << (11 ^ 24);
109 ret
|= crypto1_bit(s
, BEBIT(in
, 12), is_encrypted
) << (12 ^ 24);
110 ret
|= crypto1_bit(s
, BEBIT(in
, 13), is_encrypted
) << (13 ^ 24);
111 ret
|= crypto1_bit(s
, BEBIT(in
, 14), is_encrypted
) << (14 ^ 24);
112 ret
|= crypto1_bit(s
, BEBIT(in
, 15), is_encrypted
) << (15 ^ 24);
114 ret
|= crypto1_bit(s
, BEBIT(in
, 16), is_encrypted
) << (16 ^ 24);
115 ret
|= crypto1_bit(s
, BEBIT(in
, 17), is_encrypted
) << (17 ^ 24);
116 ret
|= crypto1_bit(s
, BEBIT(in
, 18), is_encrypted
) << (18 ^ 24);
117 ret
|= crypto1_bit(s
, BEBIT(in
, 19), is_encrypted
) << (19 ^ 24);
118 ret
|= crypto1_bit(s
, BEBIT(in
, 20), is_encrypted
) << (20 ^ 24);
119 ret
|= crypto1_bit(s
, BEBIT(in
, 21), is_encrypted
) << (21 ^ 24);
120 ret
|= crypto1_bit(s
, BEBIT(in
, 22), is_encrypted
) << (22 ^ 24);
121 ret
|= crypto1_bit(s
, BEBIT(in
, 23), is_encrypted
) << (23 ^ 24);
123 ret
|= crypto1_bit(s
, BEBIT(in
, 24), is_encrypted
) << (24 ^ 24);
124 ret
|= crypto1_bit(s
, BEBIT(in
, 25), is_encrypted
) << (25 ^ 24);
125 ret
|= crypto1_bit(s
, BEBIT(in
, 26), is_encrypted
) << (26 ^ 24);
126 ret
|= crypto1_bit(s
, BEBIT(in
, 27), is_encrypted
) << (27 ^ 24);
127 ret
|= crypto1_bit(s
, BEBIT(in
, 28), is_encrypted
) << (28 ^ 24);
128 ret
|= crypto1_bit(s
, BEBIT(in
, 29), is_encrypted
) << (29 ^ 24);
129 ret
|= crypto1_bit(s
, BEBIT(in
, 30), is_encrypted
) << (30 ^ 24);
130 ret
|= crypto1_bit(s
, BEBIT(in
, 31), is_encrypted
) << (31 ^ 24);
135 * helper used to obscure the keystream during authentication
137 uint32_t prng_successor(uint32_t x
, uint32_t n
)
141 x
= x
>> 1 | (x
>> 16 ^ x
>> 18 ^ x
>> 19 ^ x
>> 21) << 31;
143 return SWAPENDIAN(x
);