294 lines
7.1 KiB
C
294 lines
7.1 KiB
C
/*-
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* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#ifdef _KERNEL
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/uio.h>
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#else
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#include <stdint.h>
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#include <string.h>
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#include <strings.h>
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#include <errno.h>
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#include <assert.h>
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#include <openssl/evp.h>
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#define _OpenSSL_
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#endif
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#include <geom/eli/g_eli.h>
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#ifdef _KERNEL
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MALLOC_DECLARE(M_ELI);
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static int
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g_eli_crypto_done(struct cryptop *crp)
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{
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crp->crp_opaque = (void *)crp;
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wakeup(crp);
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return (0);
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}
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static int
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g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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struct cryptoini cri;
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struct cryptop *crp;
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struct cryptodesc *crd;
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struct uio *uio;
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struct iovec *iov;
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uint64_t sid;
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u_char *p;
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int error;
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bzero(&cri, sizeof(cri));
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cri.cri_alg = algo;
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cri.cri_key = __DECONST(void *, key);
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cri.cri_klen = keysize;
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error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE);
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if (error != 0)
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return (error);
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p = malloc(sizeof(*crp) + sizeof(*crd) + sizeof(*uio) + sizeof(*iov),
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M_ELI, M_NOWAIT | M_ZERO);
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if (p == NULL) {
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crypto_freesession(sid);
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return (ENOMEM);
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}
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crp = (struct cryptop *)p; p += sizeof(*crp);
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crd = (struct cryptodesc *)p; p += sizeof(*crd);
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uio = (struct uio *)p; p += sizeof(*uio);
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iov = (struct iovec *)p; p += sizeof(*iov);
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iov->iov_len = datasize;
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iov->iov_base = data;
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uio->uio_iov = iov;
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uio->uio_iovcnt = 1;
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uio->uio_segflg = UIO_SYSSPACE;
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uio->uio_resid = datasize;
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crd->crd_skip = 0;
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crd->crd_len = datasize;
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crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
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if (enc)
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crd->crd_flags |= CRD_F_ENCRYPT;
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crd->crd_alg = algo;
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crd->crd_key = __DECONST(void *, key);
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crd->crd_klen = keysize;
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bzero(crd->crd_iv, sizeof(crd->crd_iv));
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crd->crd_next = NULL;
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crp->crp_sid = sid;
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crp->crp_ilen = datasize;
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crp->crp_olen = datasize;
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crp->crp_opaque = NULL;
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crp->crp_callback = g_eli_crypto_done;
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crp->crp_buf = (void *)uio;
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crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL;
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crp->crp_desc = crd;
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error = crypto_dispatch(crp);
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if (error == 0) {
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while (crp->crp_opaque == NULL)
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tsleep(crp, PRIBIO, "geli", hz / 5);
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error = crp->crp_etype;
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}
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free(crp, M_ELI);
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crypto_freesession(sid);
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return (error);
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}
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#else /* !_KERNEL */
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static int
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g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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EVP_CIPHER_CTX ctx;
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const EVP_CIPHER *type;
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u_char iv[keysize];
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int outsize;
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switch (algo) {
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case CRYPTO_NULL_CBC:
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type = EVP_enc_null();
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break;
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case CRYPTO_AES_CBC:
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switch (keysize) {
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case 128:
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type = EVP_aes_128_cbc();
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break;
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case 192:
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type = EVP_aes_192_cbc();
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break;
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case 256:
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type = EVP_aes_256_cbc();
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break;
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default:
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return (EINVAL);
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}
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break;
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case CRYPTO_BLF_CBC:
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type = EVP_bf_cbc();
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break;
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#ifndef OPENSSL_NO_CAMELLIA
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case CRYPTO_CAMELLIA_CBC:
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switch (keysize) {
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case 128:
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type = EVP_camellia_128_cbc();
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break;
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case 192:
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type = EVP_camellia_192_cbc();
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break;
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case 256:
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type = EVP_camellia_256_cbc();
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break;
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default:
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return (EINVAL);
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}
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break;
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#endif
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case CRYPTO_3DES_CBC:
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type = EVP_des_ede3_cbc();
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break;
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default:
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return (EINVAL);
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}
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EVP_CIPHER_CTX_init(&ctx);
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EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc);
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EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8);
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EVP_CIPHER_CTX_set_padding(&ctx, 0);
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bzero(iv, sizeof(iv));
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EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc);
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if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) {
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EVP_CIPHER_CTX_cleanup(&ctx);
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return (EINVAL);
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}
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assert(outsize == (int)datasize);
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if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) {
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EVP_CIPHER_CTX_cleanup(&ctx);
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return (EINVAL);
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}
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assert(outsize == 0);
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EVP_CIPHER_CTX_cleanup(&ctx);
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return (0);
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}
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#endif /* !_KERNEL */
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int
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g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
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}
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int
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g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
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}
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void
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g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
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size_t hkeylen)
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{
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u_char k_ipad[128], key[128];
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SHA512_CTX lctx;
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u_int i;
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bzero(key, sizeof(key));
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if (hkeylen == 0)
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; /* do nothing */
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else if (hkeylen <= 128)
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bcopy(hkey, key, hkeylen);
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else {
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/* If key is longer than 128 bytes reset it to key = SHA512(key). */
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SHA512_Init(&lctx);
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SHA512_Update(&lctx, hkey, hkeylen);
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SHA512_Final(key, &lctx);
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}
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/* XOR key with ipad and opad values. */
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for (i = 0; i < sizeof(key); i++) {
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k_ipad[i] = key[i] ^ 0x36;
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ctx->k_opad[i] = key[i] ^ 0x5c;
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}
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bzero(key, sizeof(key));
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/* Perform inner SHA512. */
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SHA512_Init(&ctx->shactx);
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SHA512_Update(&ctx->shactx, k_ipad, sizeof(k_ipad));
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}
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void
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g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
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size_t datasize)
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{
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SHA512_Update(&ctx->shactx, data, datasize);
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}
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void
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g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize)
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{
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u_char digest[SHA512_MDLEN];
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SHA512_CTX lctx;
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SHA512_Final(digest, &ctx->shactx);
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/* Perform outer SHA512. */
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SHA512_Init(&lctx);
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SHA512_Update(&lctx, ctx->k_opad, sizeof(ctx->k_opad));
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bzero(ctx, sizeof(*ctx));
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SHA512_Update(&lctx, digest, sizeof(digest));
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SHA512_Final(digest, &lctx);
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/* mdsize == 0 means "Give me the whole hash!" */
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if (mdsize == 0)
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mdsize = SHA512_MDLEN;
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bcopy(digest, md, mdsize);
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}
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void
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g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data,
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size_t datasize, uint8_t *md, size_t mdsize)
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{
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struct hmac_ctx ctx;
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g_eli_crypto_hmac_init(&ctx, hkey, hkeysize);
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g_eli_crypto_hmac_update(&ctx, data, datasize);
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g_eli_crypto_hmac_final(&ctx, md, mdsize);
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}
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