/* 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