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/cdefs.h> 30 #include <sys/param.h> 31 #ifdef _KERNEL 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 #else 36 #include <stdint.h> 37 #include <string.h> 38 #include <strings.h> 39 #include <errno.h> 40 #include <assert.h> 41 #include <openssl/evp.h> 42 #define _OpenSSL_ 43 #endif 44 #include <geom/eli/g_eli.h> 45 46 #ifdef _KERNEL 47 MALLOC_DECLARE(M_ELI); 48 49 static int 50 g_eli_crypto_done(struct cryptop *crp) 51 { 52 53 crp->crp_opaque = (void *)crp; 54 wakeup(crp); 55 return (0); 56 } 57 58 static int 59 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 60 const u_char *key, size_t keysize) 61 { 62 struct crypto_session_params csp; 63 struct cryptop *crp; 64 crypto_session_t sid; 65 int error; 66 67 KASSERT(algo != CRYPTO_AES_XTS, 68 ("%s: CRYPTO_AES_XTS unexpected here", __func__)); 69 70 memset(&csp, 0, sizeof(csp)); 71 csp.csp_mode = CSP_MODE_CIPHER; 72 csp.csp_cipher_alg = algo; 73 csp.csp_ivlen = g_eli_ivlen(algo); 74 csp.csp_cipher_key = key; 75 csp.csp_cipher_klen = keysize / 8; 76 error = crypto_newsession(&sid, &csp, CRYPTOCAP_F_SOFTWARE); 77 if (error != 0) 78 return (error); 79 crp = crypto_getreq(sid, M_NOWAIT); 80 if (crp == NULL) { 81 crypto_freesession(sid); 82 return (ENOMEM); 83 } 84 85 crp->crp_payload_start = 0; 86 crp->crp_payload_length = datasize; 87 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_IV_SEPARATE; 88 crp->crp_op = enc ? CRYPTO_OP_ENCRYPT : CRYPTO_OP_DECRYPT; 89 memset(crp->crp_iv, 0, sizeof(crp->crp_iv)); 90 91 crp->crp_opaque = NULL; 92 crp->crp_callback = g_eli_crypto_done; 93 crypto_use_buf(crp, data, datasize); 94 95 error = crypto_dispatch(crp); 96 if (error == 0) { 97 while (crp->crp_opaque == NULL) 98 tsleep(crp, PRIBIO, "geli", hz / 5); 99 error = crp->crp_etype; 100 } 101 102 crypto_freereq(crp); 103 crypto_freesession(sid); 104 return (error); 105 } 106 #else /* !_KERNEL */ 107 static int 108 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 109 const u_char *key, size_t keysize) 110 { 111 EVP_CIPHER_CTX *ctx; 112 const EVP_CIPHER *type; 113 u_char iv[G_ELI_IVKEYLEN]; 114 int outsize; 115 116 assert(algo != CRYPTO_AES_XTS); 117 118 switch (algo) { 119 case CRYPTO_NULL_CBC: 120 type = EVP_enc_null(); 121 break; 122 case CRYPTO_AES_CBC: 123 switch (keysize) { 124 case 128: 125 type = EVP_aes_128_cbc(); 126 break; 127 case 192: 128 type = EVP_aes_192_cbc(); 129 break; 130 case 256: 131 type = EVP_aes_256_cbc(); 132 break; 133 default: 134 return (EINVAL); 135 } 136 break; 137 #ifndef OPENSSL_NO_CAMELLIA 138 case CRYPTO_CAMELLIA_CBC: 139 switch (keysize) { 140 case 128: 141 type = EVP_camellia_128_cbc(); 142 break; 143 case 192: 144 type = EVP_camellia_192_cbc(); 145 break; 146 case 256: 147 type = EVP_camellia_256_cbc(); 148 break; 149 default: 150 return (EINVAL); 151 } 152 break; 153 #endif 154 default: 155 return (EINVAL); 156 } 157 158 ctx = EVP_CIPHER_CTX_new(); 159 if (ctx == NULL) 160 return (ENOMEM); 161 162 EVP_CipherInit_ex(ctx, type, NULL, NULL, NULL, enc); 163 EVP_CIPHER_CTX_set_key_length(ctx, keysize / 8); 164 EVP_CIPHER_CTX_set_padding(ctx, 0); 165 bzero(iv, sizeof(iv)); 166 EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc); 167 168 if (EVP_CipherUpdate(ctx, data, &outsize, data, datasize) == 0) { 169 EVP_CIPHER_CTX_free(ctx); 170 return (EINVAL); 171 } 172 assert(outsize == (int)datasize); 173 174 if (EVP_CipherFinal_ex(ctx, data + outsize, &outsize) == 0) { 175 EVP_CIPHER_CTX_free(ctx); 176 return (EINVAL); 177 } 178 assert(outsize == 0); 179 180 EVP_CIPHER_CTX_free(ctx); 181 return (0); 182 } 183 #endif /* !_KERNEL */ 184 185 int 186 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 187 const u_char *key, size_t keysize) 188 { 189 190 /* We prefer AES-CBC for metadata protection. */ 191 if (algo == CRYPTO_AES_XTS) 192 algo = CRYPTO_AES_CBC; 193 194 return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize)); 195 } 196 197 int 198 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 199 const u_char *key, size_t keysize) 200 { 201 202 /* We prefer AES-CBC for metadata protection. */ 203 if (algo == CRYPTO_AES_XTS) 204 algo = CRYPTO_AES_CBC; 205 206 return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize)); 207 } 208