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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
/* gcm.h
*
* Galois counter mode, specified by NIST,
* http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2011 Katholieke Universiteit Leuven
* Copyright (C) 2011, 2014 Niels Möller
*
* Contributed by Nikos Mavrogiannopoulos
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#ifndef NETTLE_GCM_H_INCLUDED
#define NETTLE_GCM_H_INCLUDED
#include "aes.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define gcm_set_key nettle_gcm_set_key
#define gcm_set_iv nettle_gcm_set_iv
#define gcm_update nettle_gcm_update
#define gcm_encrypt nettle_gcm_encrypt
#define gcm_decrypt nettle_gcm_decrypt
#define gcm_digest nettle_gcm_digest
#define gcm_aes128_set_key nettle_gcm_aes128_set_key
#define gcm_aes128_set_iv nettle_gcm_aes128_set_iv
#define gcm_aes128_update nettle_gcm_aes128_update
#define gcm_aes128_encrypt nettle_gcm_aes128_encrypt
#define gcm_aes128_decrypt nettle_gcm_aes128_decrypt
#define gcm_aes128_digest nettle_gcm_aes128_digest
#define gcm_aes192_set_key nettle_gcm_aes192_set_key
#define gcm_aes192_set_iv nettle_gcm_aes192_set_iv
#define gcm_aes192_update nettle_gcm_aes192_update
#define gcm_aes192_encrypt nettle_gcm_aes192_encrypt
#define gcm_aes192_decrypt nettle_gcm_aes192_decrypt
#define gcm_aes192_digest nettle_gcm_aes192_digest
#define gcm_aes256_set_key nettle_gcm_aes256_set_key
#define gcm_aes256_set_iv nettle_gcm_aes256_set_iv
#define gcm_aes256_update nettle_gcm_aes256_update
#define gcm_aes256_encrypt nettle_gcm_aes256_encrypt
#define gcm_aes256_decrypt nettle_gcm_aes256_decrypt
#define gcm_aes256_digest nettle_gcm_aes256_digest
#define gcm_aes_set_key nettle_gcm_aes_set_key
#define gcm_aes_set_iv nettle_gcm_aes_set_iv
#define gcm_aes_update nettle_gcm_aes_update
#define gcm_aes_encrypt nettle_gcm_aes_encrypt
#define gcm_aes_decrypt nettle_gcm_aes_decrypt
#define gcm_aes_digest nettle_gcm_aes_digest
#define GCM_BLOCK_SIZE 16
#define GCM_IV_SIZE (GCM_BLOCK_SIZE - 4)
#define GCM_TABLE_BITS 8
/* Hashing subkey */
struct gcm_key
{
union nettle_block16 h[1 << GCM_TABLE_BITS];
};
/* Per-message state, depending on the iv */
struct gcm_ctx {
/* Original counter block */
union nettle_block16 iv;
/* Updated for each block. */
union nettle_block16 ctr;
/* Hashing state */
union nettle_block16 x;
uint64_t auth_size;
uint64_t data_size;
};
/* FIXME: Should use const for the cipher context. Then needs const for
nettle_crypt_func, which also rules out using that abstraction for
arcfour. */
void
gcm_set_key(struct gcm_key *key,
void *cipher, nettle_crypt_func *f);
void
gcm_set_iv(struct gcm_ctx *ctx, const struct gcm_key *key,
size_t length, const uint8_t *iv);
void
gcm_update(struct gcm_ctx *ctx, const struct gcm_key *key,
size_t length, const uint8_t *data);
void
gcm_encrypt(struct gcm_ctx *ctx, const struct gcm_key *key,
void *cipher, nettle_crypt_func *f,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_decrypt(struct gcm_ctx *ctx, const struct gcm_key *key,
void *cipher, nettle_crypt_func *f,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_digest(struct gcm_ctx *ctx, const struct gcm_key *key,
void *cipher, nettle_crypt_func *f,
size_t length, uint8_t *digest);
/* Convenience macrology (not sure how useful it is) */
/* All-in-one context, with hash subkey, message state, and cipher. */
#define GCM_CTX(type) \
{ struct gcm_key key; struct gcm_ctx gcm; type cipher; }
/* NOTE: Avoid using NULL, as we don't include anything defining it. */
#define GCM_SET_KEY(ctx, set_key, encrypt, key) \
do { \
(set_key)(&(ctx)->cipher, (key)); \
if (0) (encrypt)(&(ctx)->cipher, 0, (void *)0, (void *)0); \
gcm_set_key(&(ctx)->key, &(ctx)->cipher, \
(nettle_crypt_func *) (encrypt)); \
} while (0)
#define GCM_SET_IV(ctx, length, data) \
gcm_set_iv(&(ctx)->gcm, &(ctx)->key, (length), (data))
#define GCM_UPDATE(ctx, length, data) \
gcm_update(&(ctx)->gcm, &(ctx)->key, (length), (data))
#define GCM_ENCRYPT(ctx, encrypt, length, dst, src) \
(0 ? (encrypt)(&(ctx)->cipher, 0, (void *)0, (void *)0) \
: gcm_encrypt(&(ctx)->gcm, &(ctx)->key, &(ctx)->cipher, \
(nettle_crypt_func *) (encrypt), \
(length), (dst), (src)))
#define GCM_DECRYPT(ctx, encrypt, length, dst, src) \
(0 ? (encrypt)(&(ctx)->cipher, 0, (void *)0, (void *)0) \
: gcm_decrypt(&(ctx)->gcm, &(ctx)->key, &(ctx)->cipher, \
(nettle_crypt_func *) (encrypt), \
(length), (dst), (src)))
#define GCM_DIGEST(ctx, encrypt, length, digest) \
(0 ? (encrypt)(&(ctx)->cipher, 0, (void *)0, (void *)0) \
: gcm_digest(&(ctx)->gcm, &(ctx)->key, &(ctx)->cipher, \
(nettle_crypt_func *) (encrypt), \
(length), (digest)))
struct gcm_aes128_ctx GCM_CTX(struct aes128_ctx);
void
gcm_aes128_set_key(struct gcm_aes128_ctx *ctx,
size_t length, const uint8_t *key);
/* FIXME: Define _update and _set_iv as some kind of aliaes,
there's nothing aes-specific. */
void
gcm_aes128_update (struct gcm_aes128_ctx *ctx,
size_t length, const uint8_t *data);
void
gcm_aes128_set_iv (struct gcm_aes128_ctx *ctx,
size_t length, const uint8_t *iv);
void
gcm_aes128_encrypt(struct gcm_aes128_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes128_decrypt(struct gcm_aes128_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes128_digest(struct gcm_aes128_ctx *ctx,
size_t length, uint8_t *digest);
struct gcm_aes192_ctx GCM_CTX(struct aes192_ctx);
void
gcm_aes192_set_key(struct gcm_aes192_ctx *ctx,
size_t length, const uint8_t *key);
void
gcm_aes192_update (struct gcm_aes192_ctx *ctx,
size_t length, const uint8_t *data);
void
gcm_aes192_set_iv (struct gcm_aes192_ctx *ctx,
size_t length, const uint8_t *iv);
void
gcm_aes192_encrypt(struct gcm_aes192_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes192_decrypt(struct gcm_aes192_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes192_digest(struct gcm_aes192_ctx *ctx,
size_t length, uint8_t *digest);
struct gcm_aes256_ctx GCM_CTX(struct aes256_ctx);
void
gcm_aes256_set_key(struct gcm_aes256_ctx *ctx,
size_t length, const uint8_t *key);
void
gcm_aes256_update (struct gcm_aes256_ctx *ctx,
size_t length, const uint8_t *data);
void
gcm_aes256_set_iv (struct gcm_aes256_ctx *ctx,
size_t length, const uint8_t *iv);
void
gcm_aes256_encrypt(struct gcm_aes256_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes256_decrypt(struct gcm_aes256_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes256_digest(struct gcm_aes256_ctx *ctx,
size_t length, uint8_t *digest);
/* Old aes interface, for backwards compatibility */
struct gcm_aes_ctx GCM_CTX(struct aes_ctx);
void
gcm_aes_set_key(struct gcm_aes_ctx *ctx,
size_t length, const uint8_t *key);
void
gcm_aes_set_iv(struct gcm_aes_ctx *ctx,
size_t length, const uint8_t *iv);
void
gcm_aes_update(struct gcm_aes_ctx *ctx,
size_t length, const uint8_t *data);
void
gcm_aes_encrypt(struct gcm_aes_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes_decrypt(struct gcm_aes_ctx *ctx,
size_t length, uint8_t *dst, const uint8_t *src);
void
gcm_aes_digest(struct gcm_aes_ctx *ctx, size_t length, uint8_t *digest);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_GCM_H_INCLUDED */
|
