g_eli_crypto.c

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    1 /*-
    2  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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.
   13  *
   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
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.1/sys/geom/eli/g_eli_crypto.c 173746 2007-11-19 08:59:32Z jb $");
   29 
   30 #include <sys/param.h>
   31 #ifdef _KERNEL
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/uio.h>
   36 #else
   37 #include <stdint.h>
   38 #include <string.h>
   39 #include <strings.h>
   40 #include <errno.h>
   41 #include <assert.h>
   42 #include <openssl/evp.h>
   43 #define _OpenSSL_
   44 #endif
   45 #include <geom/eli/g_eli.h>
   46 
   47 #ifdef _KERNEL
   48 MALLOC_DECLARE(M_ELI);
   49 
   50 static int
   51 g_eli_crypto_done(struct cryptop *crp)
   52 {
   53 
   54         crp->crp_opaque = (void *)crp;
   55         wakeup(crp);
   56         return (0);
   57 }
   58 
   59 static int
   60 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
   61     const u_char *key, size_t keysize)
   62 {
   63         struct cryptoini cri;
   64         struct cryptop *crp;
   65         struct cryptodesc *crd;
   66         struct uio *uio;
   67         struct iovec *iov;
   68         uint64_t sid;
   69         u_char *p;
   70         int error;
   71 
   72         bzero(&cri, sizeof(cri));
   73         cri.cri_alg = algo;
   74         cri.cri_key = __DECONST(void *, key);
   75         cri.cri_klen = keysize;
   76         error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE);
   77         if (error != 0)
   78                 return (error);
   79         p = malloc(sizeof(*crp) + sizeof(*crd) + sizeof(*uio) + sizeof(*iov),
   80             M_ELI, M_NOWAIT | M_ZERO);
   81         if (p == NULL) {
   82                 crypto_freesession(sid);
   83                 return (ENOMEM);
   84         }
   85         crp = (struct cryptop *)p;      p += sizeof(*crp);
   86         crd = (struct cryptodesc *)p;   p += sizeof(*crd);
   87         uio = (struct uio *)p;          p += sizeof(*uio);
   88         iov = (struct iovec *)p;        p += sizeof(*iov);
   89 
   90         iov->iov_len = datasize;
   91         iov->iov_base = data;
   92 
   93         uio->uio_iov = iov;
   94         uio->uio_iovcnt = 1;
   95         uio->uio_segflg = UIO_SYSSPACE;
   96         uio->uio_resid = datasize;
   97 
   98         crd->crd_skip = 0;
   99         crd->crd_len = datasize;
  100         crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
  101         if (enc)
  102                 crd->crd_flags |= CRD_F_ENCRYPT;
  103         crd->crd_alg = algo;
  104         crd->crd_key = __DECONST(void *, key);
  105         crd->crd_klen = keysize;
  106         bzero(crd->crd_iv, sizeof(crd->crd_iv));
  107         crd->crd_next = NULL;
  108 
  109         crp->crp_sid = sid;
  110         crp->crp_ilen = datasize;
  111         crp->crp_olen = datasize;
  112         crp->crp_opaque = NULL;
  113         crp->crp_callback = g_eli_crypto_done;
  114         crp->crp_buf = (void *)uio;
  115         crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL;
  116         crp->crp_desc = crd;
  117 
  118         error = crypto_dispatch(crp);
  119         if (error == 0) {
  120                 while (crp->crp_opaque == NULL)
  121                         tsleep(crp, PRIBIO, "geli", hz / 5);
  122                 error = crp->crp_etype;
  123         }
  124 
  125         free(crp, M_ELI);
  126         crypto_freesession(sid);
  127         return (error);
  128 }
  129 #else   /* !_KERNEL */
  130 static int
  131 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
  132     const u_char *key, size_t keysize)
  133 {
  134         EVP_CIPHER_CTX ctx;
  135         const EVP_CIPHER *type;
  136         u_char iv[keysize];
  137         int outsize;
  138 
  139         switch (algo) {
  140         case CRYPTO_NULL_CBC:
  141                 type = EVP_enc_null();
  142                 break;
  143         case CRYPTO_AES_CBC:
  144                 switch (keysize) {
  145                 case 128:
  146                         type = EVP_aes_128_cbc();
  147                         break;
  148                 case 192:
  149                         type = EVP_aes_192_cbc();
  150                         break;
  151                 case 256:
  152                         type = EVP_aes_256_cbc();
  153                         break;
  154                 default:
  155                         return (EINVAL);
  156                 }
  157                 break;
  158         case CRYPTO_BLF_CBC:
  159                 type = EVP_bf_cbc();
  160                 break;
  161 #ifndef OPENSSL_NO_CAMELLIA
  162         case CRYPTO_CAMELLIA_CBC:
  163                 switch (keysize) {
  164                 case 128:
  165                         type = EVP_camellia_128_cbc();
  166                         break;
  167                 case 192:
  168                         type = EVP_camellia_192_cbc();
  169                         break;
  170                 case 256:
  171                         type = EVP_camellia_256_cbc();
  172                         break;
  173                 default:
  174                         return (EINVAL);
  175                 }
  176                 break;
  177 #endif
  178         case CRYPTO_3DES_CBC:
  179                 type = EVP_des_ede3_cbc();
  180                 break;
  181         default:
  182                 return (EINVAL);
  183         }
  184 
  185         EVP_CIPHER_CTX_init(&ctx);
  186 
  187         EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc);
  188         EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8);
  189         EVP_CIPHER_CTX_set_padding(&ctx, 0);
  190         bzero(iv, sizeof(iv));
  191         EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc);
  192 
  193         if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) {
  194                 EVP_CIPHER_CTX_cleanup(&ctx);
  195                 return (EINVAL);
  196         }
  197         assert(outsize == (int)datasize);
  198 
  199         if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) {
  200                 EVP_CIPHER_CTX_cleanup(&ctx);
  201                 return (EINVAL);
  202         }
  203         assert(outsize == 0);
  204 
  205         EVP_CIPHER_CTX_cleanup(&ctx);
  206         return (0);
  207 }
  208 #endif  /* !_KERNEL */
  209 
  210 int
  211 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
  212     const u_char *key, size_t keysize)
  213 {
  214 
  215         return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
  216 }
  217 
  218 int
  219 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
  220     const u_char *key, size_t keysize)
  221 {
  222 
  223         return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
  224 }
  225 
  226 void
  227 g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
  228     size_t hkeylen)
  229 {
  230         u_char k_ipad[128], key[128];
  231         SHA512_CTX lctx;
  232         u_int i;
  233 
  234         bzero(key, sizeof(key));
  235         if (hkeylen == 0)
  236                 ; /* do nothing */
  237         else if (hkeylen <= 128)
  238                 bcopy(hkey, key, hkeylen);
  239         else {
  240                 /* If key is longer than 128 bytes reset it to key = SHA512(key). */
  241                 SHA512_Init(&lctx);
  242                 SHA512_Update(&lctx, hkey, hkeylen);
  243                 SHA512_Final(key, &lctx);
  244         }
  245 
  246         /* XOR key with ipad and opad values. */
  247         for (i = 0; i < sizeof(key); i++) {
  248                 k_ipad[i] = key[i] ^ 0x36;
  249                 ctx->k_opad[i] = key[i] ^ 0x5c;
  250         }
  251         bzero(key, sizeof(key));
  252         /* Perform inner SHA512. */
  253         SHA512_Init(&ctx->shactx);
  254         SHA512_Update(&ctx->shactx, k_ipad, sizeof(k_ipad));
  255 }
  256 
  257 void
  258 g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
  259     size_t datasize)
  260 {
  261 
  262         SHA512_Update(&ctx->shactx, data, datasize);
  263 }
  264 
  265 void
  266 g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize)
  267 {
  268         u_char digest[SHA512_MDLEN];
  269         SHA512_CTX lctx;
  270 
  271         SHA512_Final(digest, &ctx->shactx);
  272         /* Perform outer SHA512. */
  273         SHA512_Init(&lctx);
  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         /* mdsize == 0 means "Give me the whole hash!" */
  279         if (mdsize == 0)
  280                 mdsize = SHA512_MDLEN;
  281         bcopy(digest, md, mdsize);
  282 }
  283 
  284 void
  285 g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data,
  286     size_t datasize, uint8_t *md, size_t mdsize)
  287 {
  288         struct hmac_ctx ctx;
  289 
  290         g_eli_crypto_hmac_init(&ctx, hkey, hkeysize);
  291         g_eli_crypto_hmac_update(&ctx, data, datasize);
  292         g_eli_crypto_hmac_final(&ctx, md, mdsize);
  293 }

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FreeBSD/Linux Kernel Cross Reference sys/geom/eli/g_eli_crypto.c

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sys/geom/eli/g_eli_crypto.c