1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#ifdef _KERNEL
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34#else
35#include <stdint.h>
36#include <string.h>
37#include <strings.h>
38#include <errno.h>
39#include <assert.h>
40#include <openssl/evp.h>
41#define	_OpenSSL_
42#endif
43#include <geom/eli/g_eli.h>
44
45#ifdef _KERNEL
46MALLOC_DECLARE(M_ELI);
47
48static int
49g_eli_crypto_done(struct cryptop *crp)
50{
51
52	crp->crp_opaque = (void *)crp;
53	wakeup(crp);
54	return (0);
55}
56
57static int
58g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
59    const u_char *key, size_t keysize)
60{
61	struct crypto_session_params csp;
62	struct cryptop *crp;
63	crypto_session_t sid;
64	int error;
65
66	KASSERT(algo != CRYPTO_AES_XTS,
67	    ("%s: CRYPTO_AES_XTS unexpected here", __func__));
68
69	memset(&csp, 0, sizeof(csp));
70	csp.csp_mode = CSP_MODE_CIPHER;
71	csp.csp_cipher_alg = algo;
72	csp.csp_ivlen = g_eli_ivlen(algo);
73	csp.csp_cipher_key = key;
74	csp.csp_cipher_klen = keysize / 8;
75	error = crypto_newsession(&sid, &csp, CRYPTOCAP_F_SOFTWARE);
76	if (error != 0)
77		return (error);
78	crp = crypto_getreq(sid, M_NOWAIT);
79	if (crp == NULL) {
80		crypto_freesession(sid);
81		return (ENOMEM);
82	}
83
84	crp->crp_payload_start = 0;
85	crp->crp_payload_length = datasize;
86	crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_IV_SEPARATE;
87	crp->crp_op = enc ? CRYPTO_OP_ENCRYPT : CRYPTO_OP_DECRYPT;
88	memset(crp->crp_iv, 0, sizeof(crp->crp_iv));
89
90	crp->crp_opaque = NULL;
91	crp->crp_callback = g_eli_crypto_done;
92	crypto_use_buf(crp, data, datasize);
93
94	error = crypto_dispatch(crp);
95	if (error == 0) {
96		while (crp->crp_opaque == NULL)
97			tsleep(crp, PRIBIO, "geli", hz / 5);
98		error = crp->crp_etype;
99	}
100
101	crypto_freereq(crp);
102	crypto_freesession(sid);
103	return (error);
104}
105#else	/* !_KERNEL */
106static int
107g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
108    const u_char *key, size_t keysize)
109{
110	EVP_CIPHER_CTX *ctx;
111	const EVP_CIPHER *type;
112	u_char iv[G_ELI_IVKEYLEN];
113	int outsize;
114
115	assert(algo != CRYPTO_AES_XTS);
116
117	switch (algo) {
118	case CRYPTO_NULL_CBC:
119		type = EVP_enc_null();
120		break;
121	case CRYPTO_AES_CBC:
122		switch (keysize) {
123		case 128:
124			type = EVP_aes_128_cbc();
125			break;
126		case 192:
127			type = EVP_aes_192_cbc();
128			break;
129		case 256:
130			type = EVP_aes_256_cbc();
131			break;
132		default:
133			return (EINVAL);
134		}
135		break;
136#ifndef OPENSSL_NO_CAMELLIA
137	case CRYPTO_CAMELLIA_CBC:
138		switch (keysize) {
139		case 128:
140			type = EVP_camellia_128_cbc();
141			break;
142		case 192:
143			type = EVP_camellia_192_cbc();
144			break;
145		case 256:
146			type = EVP_camellia_256_cbc();
147			break;
148		default:
149			return (EINVAL);
150		}
151		break;
152#endif
153	default:
154		return (EINVAL);
155	}
156
157	ctx = EVP_CIPHER_CTX_new();
158	if (ctx == NULL)
159		return (ENOMEM);
160
161	EVP_CipherInit_ex(ctx, type, NULL, NULL, NULL, enc);
162	EVP_CIPHER_CTX_set_key_length(ctx, keysize / 8);
163	EVP_CIPHER_CTX_set_padding(ctx, 0);
164	bzero(iv, sizeof(iv));
165	EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc);
166
167	if (EVP_CipherUpdate(ctx, data, &outsize, data, datasize) == 0) {
168		EVP_CIPHER_CTX_free(ctx);
169		return (EINVAL);
170	}
171	assert(outsize == (int)datasize);
172
173	if (EVP_CipherFinal_ex(ctx, data + outsize, &outsize) == 0) {
174		EVP_CIPHER_CTX_free(ctx);
175		return (EINVAL);
176	}
177	assert(outsize == 0);
178
179	EVP_CIPHER_CTX_free(ctx);
180	return (0);
181}
182#endif	/* !_KERNEL */
183
184int
185g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
186    const u_char *key, size_t keysize)
187{
188
189	/* We prefer AES-CBC for metadata protection. */
190	if (algo == CRYPTO_AES_XTS)
191		algo = CRYPTO_AES_CBC;
192
193	return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
194}
195
196int
197g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
198    const u_char *key, size_t keysize)
199{
200
201	/* We prefer AES-CBC for metadata protection. */
202	if (algo == CRYPTO_AES_XTS)
203		algo = CRYPTO_AES_CBC;
204
205	return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
206}
207