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
46 MALLOC_DECLARE(M_ELI);
47
48 static int
g_eli_crypto_done(struct cryptop * crp)49 g_eli_crypto_done(struct cryptop *crp)
50 {
51
52 crp->crp_opaque = (void *)crp;
53 wakeup(crp);
54 return (0);
55 }
56
57 static int
g_eli_crypto_cipher(u_int algo,int enc,u_char * data,size_t datasize,const u_char * key,size_t keysize)58 g_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 */
106 static int
g_eli_crypto_cipher(u_int algo,int enc,u_char * data,size_t datasize,const u_char * key,size_t keysize)107 g_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
184 int
g_eli_crypto_encrypt(u_int algo,u_char * data,size_t datasize,const u_char * key,size_t keysize)185 g_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
196 int
g_eli_crypto_decrypt(u_int algo,u_char * data,size_t datasize,const u_char * key,size_t keysize)197 g_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