freebsd-skq/sys/geom/eli/g_eli_crypto.c
John Birrell 18b0b6d137 On some arches, openssl is built with OPENSSL_NO_CAMELLIA, so the
code here needs to depend on that too.
2007-11-19 08:59:32 +00:00

294 lines
7.1 KiB
C

/*-
* Copyright (c) 2005 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>
#include <sys/uio.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;
struct uio *uio;
struct iovec *iov;
uint64_t sid;
u_char *p;
int error;
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) + sizeof(*uio) + sizeof(*iov),
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);
uio = (struct uio *)p; p += sizeof(*uio);
iov = (struct iovec *)p; p += sizeof(*iov);
iov->iov_len = datasize;
iov->iov_base = data;
uio->uio_iov = iov;
uio->uio_iovcnt = 1;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_resid = datasize;
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 *)uio;
crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC | CRYPTO_F_REL;
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;
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)
{
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)
{
return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
}
void
g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
size_t hkeylen)
{
u_char k_ipad[128], key[128];
SHA512_CTX lctx;
u_int i;
bzero(key, sizeof(key));
if (hkeylen == 0)
; /* do nothing */
else if (hkeylen <= 128)
bcopy(hkey, key, hkeylen);
else {
/* If key is longer than 128 bytes reset it to key = SHA512(key). */
SHA512_Init(&lctx);
SHA512_Update(&lctx, hkey, hkeylen);
SHA512_Final(key, &lctx);
}
/* XOR key with ipad and opad values. */
for (i = 0; i < sizeof(key); i++) {
k_ipad[i] = key[i] ^ 0x36;
ctx->k_opad[i] = key[i] ^ 0x5c;
}
bzero(key, sizeof(key));
/* Perform inner SHA512. */
SHA512_Init(&ctx->shactx);
SHA512_Update(&ctx->shactx, k_ipad, sizeof(k_ipad));
}
void
g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
size_t datasize)
{
SHA512_Update(&ctx->shactx, data, datasize);
}
void
g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize)
{
u_char digest[SHA512_MDLEN];
SHA512_CTX lctx;
SHA512_Final(digest, &ctx->shactx);
/* Perform outer SHA512. */
SHA512_Init(&lctx);
SHA512_Update(&lctx, ctx->k_opad, sizeof(ctx->k_opad));
bzero(ctx, sizeof(*ctx));
SHA512_Update(&lctx, digest, sizeof(digest));
SHA512_Final(digest, &lctx);
/* mdsize == 0 means "Give me the whole hash!" */
if (mdsize == 0)
mdsize = SHA512_MDLEN;
bcopy(digest, md, mdsize);
}
void
g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data,
size_t datasize, uint8_t *md, size_t mdsize)
{
struct hmac_ctx ctx;
g_eli_crypto_hmac_init(&ctx, hkey, hkeysize);
g_eli_crypto_hmac_update(&ctx, data, datasize);
g_eli_crypto_hmac_final(&ctx, md, mdsize);
}