1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/* block-internal.h
Internal implementations of nettle_blockZ-related functions.
Copyright (C) 2011 Katholieke Universiteit Leuven
Copyright (C) 2011, 2013, 2018 Niels Möller
Copyright (C) 2018 Red Hat, Inc.
Copyright (C) 2019 Dmitry Eremin-Solenikov
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* 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.
or both in parallel, as here.
GNU Nettle 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 copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
#ifndef NETTLE_BLOCK_INTERNAL_H_INCLUDED
#define NETTLE_BLOCK_INTERNAL_H_INCLUDED
#include <assert.h>
#include "nettle-types.h"
#include "bswap-internal.h"
#include "memxor.h"
static inline void
block16_zero (union nettle_block16 *r)
{
static const union nettle_block16 zero_block;
*r = zero_block;
}
static inline void
block16_set (union nettle_block16 *r,
const union nettle_block16 *x)
{
r->u64[0] = x->u64[0];
r->u64[1] = x->u64[1];
}
static inline void
block16_xor (union nettle_block16 *r,
const union nettle_block16 *x)
{
r->u64[0] ^= x->u64[0];
r->u64[1] ^= x->u64[1];
}
static inline void
block16_xor3 (union nettle_block16 *r,
const union nettle_block16 *x,
const union nettle_block16 *y)
{
r->u64[0] = x->u64[0] ^ y->u64[0];
r->u64[1] = x->u64[1] ^ y->u64[1];
}
static inline void
block16_xor_bytes (union nettle_block16 *r,
const union nettle_block16 *x,
const uint8_t *bytes)
{
memxor3 (r->b, x->b, bytes, 16);
}
static inline void
block8_xor (union nettle_block8 *r,
const union nettle_block8 *x)
{
r->u64 ^= x->u64;
}
static inline void
block8_xor3 (union nettle_block8 *r,
const union nettle_block8 *x,
const union nettle_block8 *y)
{
r->u64 = x->u64 ^ y->u64;
}
static inline void
block8_xor_bytes (union nettle_block8 *r,
const union nettle_block8 *x,
const uint8_t *bytes)
{
memxor3 (r->b, x->b, bytes, 8);
}
/* Do a foreign-endianness shift of data */
#define LSHIFT_ALIEN_UINT64(x) \
((((x) & UINT64_C(0x7f7f7f7f7f7f7f7f)) << 1) | \
(((x) & UINT64_C(0x8080808080808080)) >> 15))
#define RSHIFT_ALIEN_UINT64(x) \
((((x) & UINT64_C(0xfefefefefefefefe)) >> 1) | \
(((x) & UINT64_C(0x0001010101010101)) << 15))
/* Two typical defining polynoms */
#define BLOCK16_POLY (UINT64_C(0x87))
#define BLOCK8_POLY (UINT64_C(0x1b))
#define GHASH_POLY (UINT64_C(0xE1))
/* Galois multiplications by 2:
* functions differ in shifting right or left, big- or little- endianness
* and by defining polynom.
* r == x is allowed. */
#if WORDS_BIGENDIAN
static inline void
block16_mulx_be (union nettle_block16 *dst,
const union nettle_block16 *src)
{
uint64_t carry = src->u64[0] >> 63;
dst->u64[0] = (src->u64[0] << 1) | (src->u64[1] >> 63);
dst->u64[1] = (src->u64[1] << 1) ^ (BLOCK16_POLY & -carry);
}
static inline void
block16_mulx_le (union nettle_block16 *dst,
const union nettle_block16 *src)
{
uint64_t carry = (src->u64[1] & 0x80) >> 7;
dst->u64[1] = LSHIFT_ALIEN_UINT64(src->u64[1]) | ((src->u64[0] & 0x80) << 49);
dst->u64[0] = LSHIFT_ALIEN_UINT64(src->u64[0]) ^ ((BLOCK16_POLY << 56) & -carry);
}
static inline void
block8_mulx_be (union nettle_block8 *dst,
const union nettle_block8 *src)
{
uint64_t carry = src->u64 >> 63;
dst->u64 = (src->u64 << 1) ^ (BLOCK8_POLY & -carry);
}
static inline void
block16_mulx_ghash (union nettle_block16 *r,
const union nettle_block16 *x)
{
uint64_t mask;
/* Shift uses big-endian representation. */
mask = - (x->u64[1] & 1);
r->u64[1] = (x->u64[1] >> 1) | ((x->u64[0] & 1) << 63);
r->u64[0] = (x->u64[0] >> 1) ^ (mask & (GHASH_POLY << 56));
}
#else /* !WORDS_BIGENDIAN */
static inline void
block16_mulx_be (union nettle_block16 *dst,
const union nettle_block16 *src)
{
uint64_t carry = (src->u64[0] & 0x80) >> 7;
dst->u64[0] = LSHIFT_ALIEN_UINT64(src->u64[0]) | ((src->u64[1] & 0x80) << 49);
dst->u64[1] = LSHIFT_ALIEN_UINT64(src->u64[1]) ^ ((BLOCK16_POLY << 56) & -carry);
}
static inline void
block16_mulx_le (union nettle_block16 *dst,
const union nettle_block16 *src)
{
uint64_t carry = src->u64[1] >> 63;
dst->u64[1] = (src->u64[1] << 1) | (src->u64[0] >> 63);
dst->u64[0] = (src->u64[0] << 1) ^ (BLOCK16_POLY & -carry);
}
static inline void
block8_mulx_be (union nettle_block8 *dst,
const union nettle_block8 *src)
{
uint64_t carry = (src->u64 & 0x80) >> 7;
dst->u64 = LSHIFT_ALIEN_UINT64(src->u64) ^ ((BLOCK8_POLY << 56) & -carry);
}
static inline void
block16_mulx_ghash (union nettle_block16 *r,
const union nettle_block16 *x)
{
uint64_t mask;
/* Shift uses big-endian representation. */
mask = - ((x->u64[1] >> 56) & 1);
r->u64[1] = RSHIFT_ALIEN_UINT64(x->u64[1]) | ((x->u64[0] >> 49) & 0x80);
r->u64[0] = RSHIFT_ALIEN_UINT64(x->u64[0]) ^ (mask & GHASH_POLY);
}
#endif /* ! WORDS_BIGENDIAN */
/* Reverse bytes in X and store the result in R. This supports
in-place operation (R and X can overlap). */
static inline void
block16_bswap (union nettle_block16 *r,
const union nettle_block16 *x)
{
uint64_t t = nettle_bswap64 (x->u64[0]);
r->u64[0] = nettle_bswap64 (x->u64[1]);
r->u64[1] = t;
}
#endif /* NETTLE_BLOCK_INTERNAL_H_INCLUDED */
|
