/* $OpenBSD: p12_decr.c,v 1.21 2021/12/12 21:30:14 tb 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 <string.h>

#include <openssl/err.h>

#include <openssl/pkcs12.h>

#include "evp_locl.h"

/* Encrypt/Decrypt a buffer based on password and algor, result in a

 * malloc'ed buffer

 */

unsigned char *

PKCS12_pbe_crypt(const X509_ALGOR *algor, const char *pass, int passlen,

    const unsigned char *in, int inlen, unsigned char **data, int *datalen,

    int en_de)

{

  unsigned char *out;

  int outlen, i;

  EVP_CIPHER_CTX ctx;

  EVP_CIPHER_CTX_init(&ctx);

  /* Decrypt data */

  if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,

      algor->parameter, &ctx, en_de)) {

    out = NULL;

    PKCS12error(PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);

    goto err;

  }

  if (!(out = malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))) {

    PKCS12error(ERR_R_MALLOC_FAILURE);

    goto err;

  }

  if (!EVP_CipherUpdate(&ctx, out, &i, in, inlen)) {

    free(out);

    out = NULL;

    PKCS12error(ERR_R_EVP_LIB);

    goto err;

  }

  outlen = i;

  if (!EVP_CipherFinal_ex(&ctx, out + i, &i)) {

    free(out);

    out = NULL;

    PKCS12error(PKCS12_R_PKCS12_CIPHERFINAL_ERROR);

    goto err;

  }

  outlen += i;

  if (datalen)

    *datalen = outlen;

  if (data)

    *data = out;

err:

  EVP_CIPHER_CTX_cleanup(&ctx);

  return out;

}

/* Decrypt an OCTET STRING and decode ASN1 structure

 * if zbuf set zero buffer after use.

 */

void *

PKCS12_item_decrypt_d2i(const X509_ALGOR *algor, const ASN1_ITEM *it,

    const char *pass, int passlen, const ASN1_OCTET_STRING *oct, int zbuf)

{

  unsigned char *out;

  const unsigned char *p;

  void *ret;

  int outlen;

  if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,

      &out, &outlen, 0)) {

    PKCS12error(PKCS12_R_PKCS12_PBE_CRYPT_ERROR);

    return NULL;

  }

  p = out;

  ret = ASN1_item_d2i(NULL, &p, outlen, it);

  if (zbuf)

    explicit_bzero(out, outlen);

  if (!ret)

    PKCS12error(PKCS12_R_DECODE_ERROR);

  free(out);

  return ret;

}

/* Encode ASN1 structure and encrypt, return OCTET STRING

 * if zbuf set zero encoding.

 */

ASN1_OCTET_STRING *

PKCS12_item_i2d_encrypt(X509_ALGOR *algor, const ASN1_ITEM *it,

    const char *pass, int passlen,

    void *obj, int zbuf)

{

  ASN1_OCTET_STRING *oct;

  unsigned char *in = NULL;

  int inlen;

  if (!(oct = ASN1_OCTET_STRING_new())) {

    PKCS12error(ERR_R_MALLOC_FAILURE);

    return NULL;

  }

  inlen = ASN1_item_i2d(obj, &in, it);

  if (!in) {

    PKCS12error(PKCS12_R_ENCODE_ERROR);

    goto err;

  }

  if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,

      &oct->length, 1)) {

    PKCS12error(PKCS12_R_ENCRYPT_ERROR);

    goto err;

  }

  if (zbuf)

    explicit_bzero(in, inlen);

  free(in);

  return oct;

err:

  free(in);

  ASN1_OCTET_STRING_free(oct);

  return NULL;

}

IMPLEMENT_PKCS12_STACK_OF(PKCS7)