/* $OpenBSD: p12_mutl.c,v 1.40 2025/06/03 08:42:15 kenjiro 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/hmac.h>
#include <openssl/pkcs12.h>

#include "err_local.h"
#include "evp_local.h"
#include "hmac_local.h"
#include "pkcs12_local.h"
#include "x509_local.h"

int
PKCS12_mac_present(const PKCS12 *p12)
{
        return p12->mac != NULL;
}
LCRYPTO_ALIAS(PKCS12_mac_present);

void
PKCS12_get0_mac(const ASN1_OCTET_STRING **pmac, const X509_ALGOR **pmacalg,
    const ASN1_OCTET_STRING **psalt, const ASN1_INTEGER **piter,
    const PKCS12 *p12)
{
        if (p12->mac == NULL) {
                if (pmac != NULL)
                        *pmac = NULL;
                if (pmacalg != NULL)
                        *pmacalg = NULL;
                if (psalt != NULL)
                        *psalt = NULL;
                if (piter != NULL)
                        *piter = NULL;
                return;
        }

        if (pmac != NULL)
                *pmac = p12->mac->dinfo->digest;
        if (pmacalg != NULL)
                *pmacalg = p12->mac->dinfo->algor;
        if (psalt != NULL)
                *psalt = p12->mac->salt;
        if (piter != NULL)
                *piter = p12->mac->iter;
}
LCRYPTO_ALIAS(PKCS12_get0_mac);

/* 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 = NULL;
        ASN1_OCTET_STRING *aos;
        unsigned char key[EVP_MAX_MD_SIZE], *salt;
        int saltlen, iter;
        int md_size;
        int ret = 0;

        if (!PKCS7_type_is_data(p12->authsafes)) {
                PKCS12error(PKCS12_R_CONTENT_TYPE_NOT_DATA);
                goto err;
        }
        if ((aos = PKCS7_get_octet_string(p12->authsafes)) == NULL) {
                PKCS12error(PKCS12_R_DECODE_ERROR);
                goto err;
        }

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

        iter = 1;
        if (p12->mac->iter != NULL) {
                if ((iter = ASN1_INTEGER_get(p12->mac->iter)) <= 0) {
                        PKCS12error(PKCS12_R_DECODE_ERROR);
                        goto err;
                }
        }

        md_type = EVP_get_digestbyobj(p12->mac->dinfo->algor->algorithm);
        if (md_type == NULL) {
                PKCS12error(PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
                goto err;
        }

        if ((md_size = EVP_MD_size(md_type)) < 0)
                goto err;

        if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
            md_size, key, md_type)) {
                PKCS12error(PKCS12_R_KEY_GEN_ERROR);
                goto err;
        }

        if ((hmac = HMAC_CTX_new()) == NULL)
                goto err;
        if (!HMAC_Init_ex(hmac, key, md_size, md_type, NULL))
                goto err;
        if (!HMAC_Update(hmac, aos->data, aos->length))
                goto err;
        if (!HMAC_Final(hmac, mac, maclen))
                goto err;

        ret = 1;

 err:
        explicit_bzero(key, sizeof(key));
        HMAC_CTX_free(hmac);

        return ret;
}

/* 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)
                return 0;

        return timingsafe_memcmp(mac, p12->mac->dinfo->digest->data, maclen) == 0;
}
LCRYPTO_ALIAS(PKCS12_verify_mac);

/* 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;
}
LCRYPTO_ALIAS(PKCS12_set_mac);

/* 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);
        if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
                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