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/* $OpenBSD: gost89imit_pmeth.c,v 1.4 2017/01/29 17:49:23 beck Exp $ */
/*
* Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Copyright (c) 2005-2006 Cryptocom LTD
*
* 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.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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 <string.h>
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_GOST
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/gost.h>
#include <openssl/x509v3.h> /* For string_to_hex */
#include "evp_locl.h"
#include "gost_locl.h"
struct gost_mac_pmeth_data {
EVP_MD *md;
unsigned char key[32];
unsigned key_set :1;
};
static int
pkey_gost_mac_init(EVP_PKEY_CTX *ctx)
{
struct gost_mac_pmeth_data *data;
data = calloc(1, sizeof(struct gost_mac_pmeth_data));
if (data == NULL)
return 0;
EVP_PKEY_CTX_set_data(ctx, data);
return 1;
}
static void
pkey_gost_mac_cleanup(EVP_PKEY_CTX *ctx)
{
struct gost_mac_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
free(data);
}
static int
pkey_gost_mac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
struct gost_mac_pmeth_data *dst_data, *src_data;
if (pkey_gost_mac_init(dst) == 0)
return 0;
src_data = EVP_PKEY_CTX_get_data(src);
dst_data = EVP_PKEY_CTX_get_data(dst);
*dst_data = *src_data;
return 1;
}
static int
pkey_gost_mac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
struct gost_mac_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
unsigned char *keydata;
if (!data->key_set) {
GOSTerror(GOST_R_MAC_KEY_NOT_SET);
return 0;
}
keydata = malloc(32);
if (keydata == NULL) {
GOSTerror(ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(keydata, data->key, 32);
EVP_PKEY_assign(pkey, NID_id_Gost28147_89_MAC, keydata);
return 1;
}
static int
pkey_gost_mac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
struct gost_mac_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
switch (type) {
case EVP_PKEY_CTRL_MD:
if (EVP_MD_type(p2) != NID_id_Gost28147_89_MAC) {
GOSTerror(GOST_R_INVALID_DIGEST_TYPE);
return 0;
}
data->md = p2;
return 1;
case EVP_PKEY_CTRL_SET_MAC_KEY:
if (p1 != 32) {
GOSTerror(GOST_R_INVALID_MAC_KEY_LENGTH);
return 0;
}
memcpy(data->key, p2, 32);
data->key_set = 1;
return 1;
case EVP_PKEY_CTRL_DIGESTINIT:
{
EVP_MD_CTX *mctx = p2;
void *key;
if (!data->key_set) {
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx);
if (pkey == NULL) {
GOSTerror(GOST_R_MAC_KEY_NOT_SET);
return 0;
}
key = EVP_PKEY_get0(pkey);
if (key == NULL) {
GOSTerror(GOST_R_MAC_KEY_NOT_SET);
return 0;
}
} else {
key = &(data->key);
}
if (mctx->digest->md_ctrl == NULL)
return 0;
return mctx->digest->md_ctrl(mctx, EVP_MD_CTRL_SET_KEY, 32 * 8,
key);
}
}
return -2;
}
static int
pkey_gost_mac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
{
if (value == NULL)
return 0;
if (strcmp(type, "key") == 0) {
void *p = (void *)value;
return pkey_gost_mac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY,
strlen(value), p);
}
if (strcmp(type, "hexkey") == 0) {
unsigned char *key;
int r;
long keylen;
key = string_to_hex(value, &keylen);
if (key == NULL)
return 0;
r = pkey_gost_mac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen,
key);
free(key);
return r;
}
return -2;
}
static int
pkey_gost_mac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
{
return 1;
}
static int
pkey_gost_mac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx)
{
/* for platforms where sizeof(int) != sizeof(size_t)*/
unsigned int tmpsiglen = *siglen;
int ret;
if (sig == NULL) {
*siglen = 4;
return 1;
}
ret = EVP_DigestFinal_ex(mctx, sig, &tmpsiglen);
*siglen = tmpsiglen;
return ret;
}
const EVP_PKEY_METHOD gostimit_pkey_meth = {
.pkey_id = EVP_PKEY_GOSTIMIT,
.init = pkey_gost_mac_init,
.cleanup = pkey_gost_mac_cleanup,
.copy = pkey_gost_mac_copy,
.keygen = pkey_gost_mac_keygen,
.signctx_init = pkey_gost_mac_signctx_init,
.signctx = pkey_gost_mac_signctx,
.ctrl = pkey_gost_mac_ctrl,
.ctrl_str = pkey_gost_mac_ctrl_str,
};
#endif
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