/* $OpenBSD: p12_mutl.c,v 1.23 2017/01/29 17:49:23 beck Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. 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.
*
* 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
* licensing@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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_HMAC
#include <openssl/err.h>
#include <openssl/hmac.h>
#include <openssl/pkcs12.h>
/* Generate a MAC */
int
PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen)
{
const EVP_MD *md_type;
HMAC_CTX hmac;
unsigned char key[EVP_MAX_MD_SIZE], *salt;
int saltlen, iter;
int md_size;
if (!PKCS7_type_is_data(p12->authsafes)) {
PKCS12error(PKCS12_R_CONTENT_TYPE_NOT_DATA);
return 0;
}
salt = p12->mac->salt->data;
saltlen = p12->mac->salt->length;
if (!p12->mac->iter)
iter = 1;
else if ((iter = ASN1_INTEGER_get(p12->mac->iter)) <= 0) {
PKCS12error(PKCS12_R_DECODE_ERROR);
return 0;
}
if (!(md_type = EVP_get_digestbyobj(
p12->mac->dinfo->algor->algorithm))) {
PKCS12error(PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
return 0;
}
md_size = EVP_MD_size(md_type);
if (md_size < 0)
return 0;
if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
md_size, key, md_type)) {
PKCS12error(PKCS12_R_KEY_GEN_ERROR);
return 0;
}
HMAC_CTX_init(&hmac);
if (!HMAC_Init_ex(&hmac, key, md_size, md_type, NULL) ||
!HMAC_Update(&hmac, p12->authsafes->d.data->data,
p12->authsafes->d.data->length) ||
!HMAC_Final(&hmac, mac, maclen)) {
HMAC_CTX_cleanup(&hmac);
return 0;
}
HMAC_CTX_cleanup(&hmac);
return 1;
}
/* Verify the mac */
int
PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
{
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
if (p12->mac == NULL) {
PKCS12error(PKCS12_R_MAC_ABSENT);
return 0;
}
if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
PKCS12error(PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
if ((maclen != (unsigned int)p12->mac->dinfo->digest->length) ||
memcmp(mac, p12->mac->dinfo->digest->data, maclen))
return 0;
return 1;
}
/* Set a mac */
int
PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen, unsigned char *salt,
int saltlen, int iter, const EVP_MD *md_type)
{
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
if (!md_type)
md_type = EVP_sha1();
if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) ==
PKCS12_ERROR) {
PKCS12error(PKCS12_R_MAC_SETUP_ERROR);
return 0;
}
if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
PKCS12error(PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
if (!(ASN1_STRING_set(p12->mac->dinfo->digest, mac, maclen))) {
PKCS12error(PKCS12_R_MAC_STRING_SET_ERROR);
return 0;
}
return 1;
}
/* Set up a mac structure */
int
PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
const EVP_MD *md_type)
{
if (!(p12->mac = PKCS12_MAC_DATA_new()))
return PKCS12_ERROR;
if (iter > 1) {
if (!(p12->mac->iter = ASN1_INTEGER_new())) {
PKCS12error(ERR_R_MALLOC_FAILURE);
return 0;
}
if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
PKCS12error(ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (!saltlen)
saltlen = PKCS12_SALT_LEN;
if (!(p12->mac->salt->data = malloc(saltlen))) {
PKCS12error(ERR_R_MALLOC_FAILURE);
return 0;
}
p12->mac->salt->length = saltlen;
if (!salt)
arc4random_buf(p12->mac->salt->data, saltlen);
else
memcpy (p12->mac->salt->data, salt, saltlen);
p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type));
if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) {
PKCS12error(ERR_R_MALLOC_FAILURE);
return 0;
}
p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL;
return 1;
}
#endif