/* p12_mutl.c */

/*

 * 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).

 *

 */

#ifndef OPENSSL_NO_HMAC

# include <stdio.h>

# include "cryptlib.h"

# include <openssl/crypto.h>

# include <openssl/hmac.h>

# include <openssl/rand.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)) {

        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;

    }

    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)) {

        PKCS12err(PKCS12_F_PKCS12_GEN_MAC, 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) {

        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)

        || CRYPTO_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) {

        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 */

int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,

                     const EVP_MD *md_type)

{

    PKCS12_MAC_DATA_free(p12->mac);

    p12->mac = NULL;

    if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)

        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;

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

        PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);

        return 0;

    }

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

    if (!salt) {

        if (RAND_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