1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2023 Stormshield
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef _OSSL_AES_GCM_H_
28#define	_OSSL_AES_GCM_H_
29
30#include <crypto/openssl/ossl_cipher.h>
31
32struct ossl_gcm_context;
33
34struct ossl_aes_gcm_ops {
35	void (*init)(struct ossl_gcm_context *ctx, const void *key,
36	    size_t keylen);
37	void (*setiv)(struct ossl_gcm_context *ctx, const unsigned char *iv,
38	    size_t ivlen);
39	int (*aad)(struct ossl_gcm_context *ctx, const unsigned char *aad,
40	    size_t len);
41	int (*encrypt)(struct ossl_gcm_context *ctx, const unsigned char *in,
42	    unsigned char *out, size_t len);
43	int (*decrypt)(struct ossl_gcm_context *ctx, const unsigned char *in,
44	    unsigned char *out, size_t len);
45	int (*finish)(struct ossl_gcm_context *ctx, const unsigned char *tag,
46	    size_t len);
47	void (*tag)(struct ossl_gcm_context *ctx, unsigned char *tag,
48	    size_t len);
49};
50
51#ifndef __SIZEOF_INT128__
52typedef	struct { uint64_t v[2]; } __uint128_t;
53#endif
54
55struct ossl_gcm_context {
56	struct {
57		union {
58			uint64_t u[2];
59			uint32_t d[4];
60			uint8_t c[16];
61		} Yi, EKi, EK0, len, Xi, H;
62		__uint128_t Htable[16];
63		unsigned int mres, ares;
64	} gcm;
65
66	struct ossl_aes_keysched aes_ks;
67
68	const struct ossl_aes_gcm_ops *ops;
69};
70
71#endif /* !_OSSL_AES_GCM_H_ */
72