freebsd-nq/sys/geom/eli/g_eli_crypto.c
Pedro F. Giffuni 3728855a0f sys/geom: adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:17:37 +00:00

226 lines
5.5 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#else
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <assert.h>
#include <openssl/evp.h>
#define _OpenSSL_
#endif
#include <geom/eli/g_eli.h>
#ifdef _KERNEL
MALLOC_DECLARE(M_ELI);
static int
g_eli_crypto_done(struct cryptop *crp)
{
crp->crp_opaque = (void *)crp;
wakeup(crp);
return (0);
}
static int
g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
struct cryptoini cri;
struct cryptop *crp;
struct cryptodesc *crd;
uint64_t sid;
u_char *p;
int error;
KASSERT(algo != CRYPTO_AES_XTS,
("%s: CRYPTO_AES_XTS unexpected here", __func__));
bzero(&cri, sizeof(cri));
cri.cri_alg = algo;
cri.cri_key = __DECONST(void *, key);
cri.cri_klen = keysize;
error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE);
if (error != 0)
return (error);
p = malloc(sizeof(*crp) + sizeof(*crd), M_ELI, M_NOWAIT | M_ZERO);
if (p == NULL) {
crypto_freesession(sid);
return (ENOMEM);
}
crp = (struct cryptop *)p; p += sizeof(*crp);
crd = (struct cryptodesc *)p; p += sizeof(*crd);
crd->crd_skip = 0;
crd->crd_len = datasize;
crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
if (enc)
crd->crd_flags |= CRD_F_ENCRYPT;
crd->crd_alg = algo;
crd->crd_key = __DECONST(void *, key);
crd->crd_klen = keysize;
bzero(crd->crd_iv, sizeof(crd->crd_iv));
crd->crd_next = NULL;
crp->crp_sid = sid;
crp->crp_ilen = datasize;
crp->crp_olen = datasize;
crp->crp_opaque = NULL;
crp->crp_callback = g_eli_crypto_done;
crp->crp_buf = (void *)data;
crp->crp_flags = CRYPTO_F_CBIFSYNC;
crp->crp_desc = crd;
error = crypto_dispatch(crp);
if (error == 0) {
while (crp->crp_opaque == NULL)
tsleep(crp, PRIBIO, "geli", hz / 5);
error = crp->crp_etype;
}
free(crp, M_ELI);
crypto_freesession(sid);
return (error);
}
#else /* !_KERNEL */
static int
g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
EVP_CIPHER_CTX ctx;
const EVP_CIPHER *type;
u_char iv[keysize];
int outsize;
assert(algo != CRYPTO_AES_XTS);
switch (algo) {
case CRYPTO_NULL_CBC:
type = EVP_enc_null();
break;
case CRYPTO_AES_CBC:
switch (keysize) {
case 128:
type = EVP_aes_128_cbc();
break;
case 192:
type = EVP_aes_192_cbc();
break;
case 256:
type = EVP_aes_256_cbc();
break;
default:
return (EINVAL);
}
break;
case CRYPTO_BLF_CBC:
type = EVP_bf_cbc();
break;
#ifndef OPENSSL_NO_CAMELLIA
case CRYPTO_CAMELLIA_CBC:
switch (keysize) {
case 128:
type = EVP_camellia_128_cbc();
break;
case 192:
type = EVP_camellia_192_cbc();
break;
case 256:
type = EVP_camellia_256_cbc();
break;
default:
return (EINVAL);
}
break;
#endif
case CRYPTO_3DES_CBC:
type = EVP_des_ede3_cbc();
break;
default:
return (EINVAL);
}
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc);
EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8);
EVP_CIPHER_CTX_set_padding(&ctx, 0);
bzero(iv, sizeof(iv));
EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc);
if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) {
EVP_CIPHER_CTX_cleanup(&ctx);
return (EINVAL);
}
assert(outsize == (int)datasize);
if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) {
EVP_CIPHER_CTX_cleanup(&ctx);
return (EINVAL);
}
assert(outsize == 0);
EVP_CIPHER_CTX_cleanup(&ctx);
return (0);
}
#endif /* !_KERNEL */
int
g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
/* We prefer AES-CBC for metadata protection. */
if (algo == CRYPTO_AES_XTS)
algo = CRYPTO_AES_CBC;
return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
}
int
g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
const u_char *key, size_t keysize)
{
/* We prefer AES-CBC for metadata protection. */
if (algo == CRYPTO_AES_XTS)
algo = CRYPTO_AES_CBC;
return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
}