/*
 * 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 "internal/cryptlib.h"
# include <openssl/crypto.h>
# include <openssl/hmac.h>
# include <openssl/rand.h>
# include <openssl/pkcs12.h>
# include "p12_lcl.h"

int PKCS12_mac_present(PKCS12 *p12)
{
    return p12->mac ? 1 : 0;
}

void PKCS12_get0_mac(ASN1_OCTET_STRING **pmac, X509_ALGOR **pmacalg,
                     ASN1_OCTET_STRING **psalt, ASN1_INTEGER **piter,
                     PKCS12 *p12)
{
    if (p12->mac) {
        X509_SIG_get0(pmacalg, pmac, p12->mac->dinfo);
        if (psalt)
            *psalt = p12->mac->salt;
        if (piter)
            *piter = p12->mac->iter;
    } else {
        if (pmac)
            *pmac = NULL;
        if (pmacalg)
            *pmacalg = NULL;
        if (psalt)
            *psalt = NULL;
        if (piter)
            *piter = NULL;
    }
}

# define TK26_MAC_KEY_LEN 32

static int pkcs12_gen_gost_mac_key(const char *pass, int passlen,
                                   const unsigned char *salt, int saltlen,
                                   int iter, int keylen, unsigned char *key,
                                   const EVP_MD *digest)
{
    unsigned char out[96];

    if (keylen != TK26_MAC_KEY_LEN) {
        return 0;
    }

    if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter,
                           digest, sizeof(out), out)) {
        return 0;
    }
    memcpy(key, out + sizeof(out) - TK26_MAC_KEY_LEN, TK26_MAC_KEY_LEN);
    OPENSSL_cleanse(out, sizeof(out));
    return 1;
}

/* 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;
    unsigned char key[EVP_MAX_MD_SIZE], *salt;
    int saltlen, iter;
    int md_size = 0;
    int md_type_nid;
    X509_ALGOR *macalg;
    ASN1_OBJECT *macoid;

    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);
    X509_SIG_get0(&macalg, NULL, p12->mac->dinfo);
    X509_ALGOR_get0(&macoid, NULL, NULL, macalg);
    if ((md_type = EVP_get_digestbyobj(macoid)) == NULL) {
        PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
        return 0;
    }
    md_size = EVP_MD_size(md_type);
    md_type_nid = EVP_MD_type(md_type);
    if (md_size < 0)
        return 0;
    if ((md_type_nid == NID_id_GostR3411_94
         || md_type_nid == NID_id_GostR3411_2012_256
         || md_type_nid == NID_id_GostR3411_2012_512)
        && !getenv("LEGACY_GOST_PKCS12")) {
        md_size = TK26_MAC_KEY_LEN;
        if (!pkcs12_gen_gost_mac_key(pass, passlen, salt, saltlen, iter,
                                     md_size, key, md_type)) {
            PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_KEY_GEN_ERROR);
            return 0;
        }
    } else
        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 = HMAC_CTX_new();
    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_free(hmac);
        return 0;
    }
    HMAC_CTX_free(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;
    ASN1_OCTET_STRING *macoct;

    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;
    }
    X509_SIG_get0(NULL, &macoct, p12->mac->dinfo);
    if ((maclen != (unsigned int)ASN1_STRING_length(macoct))
        || CRYPTO_memcmp(mac, ASN1_STRING_data(macoct), 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;
    ASN1_OCTET_STRING *macoct;

    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;
    }
    X509_SIG_get0(NULL, &macoct, p12->mac->dinfo);
    if (!ASN1_OCTET_STRING_set(macoct, 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)
{
    X509_ALGOR *macalg;

    if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
        return PKCS12_ERROR;
    if (iter > 1) {
        if ((p12->mac->iter = ASN1_INTEGER_new()) == NULL) {
            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);
    X509_SIG_get0(&macalg, NULL, p12->mac->dinfo);
    if (!X509_ALGOR_set0(macalg, OBJ_nid2obj(EVP_MD_type(md_type)),
                         V_ASN1_NULL, NULL)) {
        PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    return 1;
}