2 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
41 #include <openssl/evp.h>
44 #include <geom/eli/g_eli.h>
47 MALLOC_DECLARE(M_ELI);
50 g_eli_crypto_done(struct cryptop *crp)
53 crp->crp_opaque = (void *)crp;
59 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
60 const u_char *key, size_t keysize)
64 struct cryptodesc *crd;
69 KASSERT(algo != CRYPTO_AES_XTS,
70 ("%s: CRYPTO_AES_XTS unexpected here", __func__));
72 bzero(&cri, sizeof(cri));
74 cri.cri_key = __DECONST(void *, key);
75 cri.cri_klen = keysize;
76 error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE);
79 p = malloc(sizeof(*crp) + sizeof(*crd), M_ELI, M_NOWAIT | M_ZERO);
81 crypto_freesession(sid);
84 crp = (struct cryptop *)p; p += sizeof(*crp);
85 crd = (struct cryptodesc *)p; p += sizeof(*crd);
88 crd->crd_len = datasize;
89 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
91 crd->crd_flags |= CRD_F_ENCRYPT;
93 crd->crd_key = __DECONST(void *, key);
94 crd->crd_klen = keysize;
95 bzero(crd->crd_iv, sizeof(crd->crd_iv));
99 crp->crp_ilen = datasize;
100 crp->crp_olen = datasize;
101 crp->crp_opaque = NULL;
102 crp->crp_callback = g_eli_crypto_done;
103 crp->crp_buf = (void *)data;
104 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL;
107 error = crypto_dispatch(crp);
109 while (crp->crp_opaque == NULL)
110 tsleep(crp, PRIBIO, "geli", hz / 5);
111 error = crp->crp_etype;
115 crypto_freesession(sid);
120 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
121 const u_char *key, size_t keysize)
124 const EVP_CIPHER *type;
128 assert(algo != CRYPTO_AES_XTS);
131 case CRYPTO_NULL_CBC:
132 type = EVP_enc_null();
137 type = EVP_aes_128_cbc();
140 type = EVP_aes_192_cbc();
143 type = EVP_aes_256_cbc();
152 #ifndef OPENSSL_NO_CAMELLIA
153 case CRYPTO_CAMELLIA_CBC:
156 type = EVP_camellia_128_cbc();
159 type = EVP_camellia_192_cbc();
162 type = EVP_camellia_256_cbc();
169 case CRYPTO_3DES_CBC:
170 type = EVP_des_ede3_cbc();
176 EVP_CIPHER_CTX_init(&ctx);
178 EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc);
179 EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8);
180 EVP_CIPHER_CTX_set_padding(&ctx, 0);
181 bzero(iv, sizeof(iv));
182 EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc);
184 if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) {
185 EVP_CIPHER_CTX_cleanup(&ctx);
188 assert(outsize == (int)datasize);
190 if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) {
191 EVP_CIPHER_CTX_cleanup(&ctx);
194 assert(outsize == 0);
196 EVP_CIPHER_CTX_cleanup(&ctx);
199 #endif /* !_KERNEL */
202 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
203 const u_char *key, size_t keysize)
206 /* We prefer AES-CBC for metadata protection. */
207 if (algo == CRYPTO_AES_XTS)
208 algo = CRYPTO_AES_CBC;
210 return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
214 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
215 const u_char *key, size_t keysize)
218 /* We prefer AES-CBC for metadata protection. */
219 if (algo == CRYPTO_AES_XTS)
220 algo = CRYPTO_AES_CBC;
222 return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
226 g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
229 u_char k_ipad[128], key[128];
233 bzero(key, sizeof(key));
236 else if (hkeylen <= 128)
237 bcopy(hkey, key, hkeylen);
239 /* If key is longer than 128 bytes reset it to key = SHA512(key). */
241 SHA512_Update(&lctx, hkey, hkeylen);
242 SHA512_Final(key, &lctx);
245 /* XOR key with ipad and opad values. */
246 for (i = 0; i < sizeof(key); i++) {
247 k_ipad[i] = key[i] ^ 0x36;
248 ctx->k_opad[i] = key[i] ^ 0x5c;
250 bzero(key, sizeof(key));
251 /* Perform inner SHA512. */
252 SHA512_Init(&ctx->shactx);
253 SHA512_Update(&ctx->shactx, k_ipad, sizeof(k_ipad));
254 bzero(k_ipad, sizeof(k_ipad));
258 g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
262 SHA512_Update(&ctx->shactx, data, datasize);
266 g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize)
268 u_char digest[SHA512_MDLEN];
271 SHA512_Final(digest, &ctx->shactx);
272 /* Perform outer SHA512. */
274 SHA512_Update(&lctx, ctx->k_opad, sizeof(ctx->k_opad));
275 bzero(ctx, sizeof(*ctx));
276 SHA512_Update(&lctx, digest, sizeof(digest));
277 SHA512_Final(digest, &lctx);
278 bzero(&lctx, sizeof(lctx));
279 /* mdsize == 0 means "Give me the whole hash!" */
281 mdsize = SHA512_MDLEN;
282 bcopy(digest, md, mdsize);
283 bzero(digest, sizeof(digest));
287 g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data,
288 size_t datasize, uint8_t *md, size_t mdsize)
292 g_eli_crypto_hmac_init(&ctx, hkey, hkeysize);
293 g_eli_crypto_hmac_update(&ctx, data, datasize);
294 g_eli_crypto_hmac_final(&ctx, md, mdsize);