/* p12_mutl.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 "cryptlib.h"
#include "hmac.h"
#include "rand.h"
#include "pkcs12.h"

/* Generate a MAC */
int PKCS12_gen_mac (p12, pass, passlen, mac, maclen)
PKCS12 *p12;
unsigned char *pass;
int passlen;
unsigned char *mac;
unsigned int *maclen;
{
	const EVP_MD *md_type;
	HMAC_CTX hmac;
	unsigned char key[PKCS12_MAC_KEY_LENGTH], *salt;
	int saltlen, iter;
	salt = p12->mac->salt->data;
	saltlen = p12->mac->salt->length;
	if (!p12->mac->iter) iter = 1;
	else iter = ASN1_INTEGER_get (p12->mac->iter);
    	if(!(md_type =
		 EVP_get_digestbyobj (p12->mac->dinfo->algor->algorithm))) {
		PKCS12err(PKCS12_F_PKCS12_GEN_MAC,PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
		return 0;
	}
	if(!PKCS12_key_gen (pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
				 PKCS12_MAC_KEY_LENGTH, key, md_type)) {
		PKCS12err(PKCS12_F_PKCS12_GEN_MAC,PKCS12_R_KEY_GEN_ERROR);
		return 0;
	}
	HMAC_Init (&hmac, key, PKCS12_MAC_KEY_LENGTH, md_type);
    	HMAC_Update (&hmac, p12->authsafes->d.data->data,
					 p12->authsafes->d.data->length);
    	HMAC_Final (&hmac, mac, maclen);
	return 1;
}

/* Verify the mac */
int PKCS12_verify_mac (p12, pass, passlen)
PKCS12 *p12;
unsigned char *pass;
int passlen;
{
	unsigned char mac[EVP_MAX_MD_SIZE];
	unsigned int maclen;
	if(p12->mac == NULL) {
		PKCS12err(PKCS12_F_VERIFY_MAC,PKCS12_R_MAC_ABSENT);
		return 0;
	}
	if (!PKCS12_gen_mac (p12, pass, passlen, mac, &maclen)) {
		PKCS12err(PKCS12_F_VERIFY_MAC,PKCS12_R_MAC_GENERATION_ERROR);
		return 0;
	}
	if ((maclen != (unsigned int)p12->mac->dinfo->digest->length)
	|| memcmp (mac, p12->mac->dinfo->digest->data, maclen)) {
		PKCS12err(PKCS12_F_VERIFY_MAC,PKCS12_R_MAC_VERIFY_ERROR);
		return 0;
	}
	return 1;
}

/* Set a mac */

int PKCS12_set_mac (p12, pass, passlen, salt, saltlen, iter, md_type)
PKCS12 *p12;
unsigned char *pass;
int passlen;
unsigned char *salt;
int saltlen;
int iter;
EVP_MD *md_type;
{
	unsigned char mac[EVP_MAX_MD_SIZE];
	int maclen;
	if (!md_type) md_type = EVP_sha1();
	if (PKCS12_setup_mac (p12, iter, salt, saltlen, md_type) ==
				 	PKCS12_ERROR) {
		PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_SETUP_ERROR);
		return 0;
	}
	if (!PKCS12_gen_mac (p12, pass, passlen, mac, &maclen)) {
		PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_GENERATION_ERROR);
		return 0;
	}
	if (!(ASN1_OCTET_STRING_set (p12->mac->dinfo->digest, mac, maclen))) {
		PKCS12err(PKCS12_F_PKCS12_PKCS12_SET_MAC,PKCS12_R_MAC_STRING_SET_ERROR);
						return 0;
	}
	return 1;
}

/* Set up a mac structure */
int PKCS12_setup_mac (p12, iter, salt, saltlen, md_type)
PKCS12 *p12;
int iter;
unsigned char *salt;
int saltlen;
EVP_MD *md_type;
{
	if (!(p12->mac = PKCS12_MAC_DATA_new ())) return PKCS12_ERROR;
	if (iter > 1) {
		if(!(p12->mac->iter = ASN1_INTEGER_new())) {
			PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
			return 0;
		}
		ASN1_INTEGER_set (p12->mac->iter, iter);
	}
	if (!saltlen) saltlen = PKCS12_SALT_LEN;
	p12->mac->salt->length = saltlen;
	if (!(p12->mac->salt->data = Malloc (saltlen))) {
		PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
		return 0;
	}
	if (!salt) RAND_bytes (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())) {
		PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
		return 0;
	}
	p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL;
	
	return 1;
}