/* 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).

 *

 */

#ifndef OPENSSL_NO_HMAC

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/hmac.h>

#include <openssl/rand.h>

#include <openssl/pkcs12.h>

/* Generate a MAC */

EXPORT_C 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;

	if (!PKCS7_type_is_data(p12->authsafes))

		{

		PKCS12err(PKCS12_F_PKCS12_GEN_MAC,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 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,

				 EVP_MD_size(md_type), key, md_type)) {

		PKCS12err(PKCS12_F_PKCS12_GEN_MAC,PKCS12_R_KEY_GEN_ERROR);

		return 0;

	}

	HMAC_CTX_init(&hmac);

	HMAC_Init_ex(&hmac, key, EVP_MD_size(md_type), 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 1;

}

/* Verify the mac */

EXPORT_C 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) {

		PKCS12err(PKCS12_F_PKCS12_VERIFY_MAC,PKCS12_R_MAC_ABSENT);

		return 0;

	}

	if (!PKCS12_gen_mac (p12, pass, passlen, mac, &maclen)) {

		PKCS12err(PKCS12_F_PKCS12_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)) return 0;

	return 1;

}

/* Set a mac */

EXPORT_C 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) {

		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 (!(M_ASN1_OCTET_STRING_set (p12->mac->dinfo->digest, mac, maclen))) {

		PKCS12err(PKCS12_F_PKCS12_SET_MAC,PKCS12_R_MAC_STRING_SET_ERROR);

						return 0;

	}

	return 1;

}

/* Set up a mac structure */

EXPORT_C 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 = M_ASN1_INTEGER_new())) {

			PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);

			return 0;

		}

		if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {

			PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);

			return 0;

		}

	}

	if (!saltlen) saltlen = PKCS12_SALT_LEN;

	p12->mac->salt->length = saltlen;

	if (!(p12->mac->salt->data = OPENSSL_malloc (saltlen))) {

		PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);

		return 0;

	}

	if (!salt) {

		if (RAND_pseudo_bytes (p12->mac->salt->data, saltlen) < 0)

			return 0;

	}

	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;

}

#endif