text: /* p5_crpt.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).
   *
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include "cryptlib.h"
  #include <openssl/x509.h>
  #include <openssl/evp.h>
  
  /*
   * PKCS#5 v1.5 compatible PBE functions: see PKCS#5 v2.0 for more info.
   */
  
  void PKCS5_PBE_add(void)
  {
  #ifndef OPENSSL_NO_DES
  # ifndef OPENSSL_NO_MD5
      EVP_PBE_alg_add(NID_pbeWithMD5AndDES_CBC, EVP_des_cbc(), EVP_md5(),
                      PKCS5_PBE_keyivgen);
  # endif
  # ifndef OPENSSL_NO_MD2
      EVP_PBE_alg_add(NID_pbeWithMD2AndDES_CBC, EVP_des_cbc(), EVP_md2(),
                      PKCS5_PBE_keyivgen);
  # endif
  # ifndef OPENSSL_NO_SHA
      EVP_PBE_alg_add(NID_pbeWithSHA1AndDES_CBC, EVP_des_cbc(), EVP_sha1(),
                      PKCS5_PBE_keyivgen);
  # endif
  #endif
  #ifndef OPENSSL_NO_RC2
  # ifndef OPENSSL_NO_MD5
      EVP_PBE_alg_add(NID_pbeWithMD5AndRC2_CBC, EVP_rc2_64_cbc(), EVP_md5(),
                      PKCS5_PBE_keyivgen);
  # endif
  # ifndef OPENSSL_NO_MD2
      EVP_PBE_alg_add(NID_pbeWithMD2AndRC2_CBC, EVP_rc2_64_cbc(), EVP_md2(),
                      PKCS5_PBE_keyivgen);
  # endif
  # ifndef OPENSSL_NO_SHA
      EVP_PBE_alg_add(NID_pbeWithSHA1AndRC2_CBC, EVP_rc2_64_cbc(), EVP_sha1(),
                      PKCS5_PBE_keyivgen);
  # endif
  #endif
  #ifndef OPENSSL_NO_HMAC
      EVP_PBE_alg_add(NID_pbes2, NULL, NULL, PKCS5_v2_PBE_keyivgen);
  #endif
  }
  
  int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
                         ASN1_TYPE *param, const EVP_CIPHER *cipher,
                         const EVP_MD *md, int en_de)
  {
      EVP_MD_CTX ctx;
      unsigned char md_tmp[EVP_MAX_MD_SIZE];
      unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
      int i;
      PBEPARAM *pbe;
      int saltlen, iter;
      unsigned char *salt;
      const unsigned char *pbuf;
  
      /* Extract useful info from parameter */
      if (param == NULL || param->type != V_ASN1_SEQUENCE ||
          param->value.sequence == NULL) {
          EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
          return 0;
      }
  
      pbuf = param->value.sequence->data;
      if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
          EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
          return 0;
      }
  
      if (!pbe->iter)
          iter = 1;
      else
          iter = ASN1_INTEGER_get(pbe->iter);
      salt = pbe->salt->data;
      saltlen = pbe->salt->length;
  
      if (!pass)
          passlen = 0;
      else if (passlen == -1)
          passlen = strlen(pass);
  
      EVP_MD_CTX_init(&ctx);
      EVP_DigestInit_ex(&ctx, md, NULL);
      EVP_DigestUpdate(&ctx, pass, passlen);
      EVP_DigestUpdate(&ctx, salt, saltlen);
      PBEPARAM_free(pbe);
      EVP_DigestFinal_ex(&ctx, md_tmp, NULL);
      for (i = 1; i < iter; i++) {
          EVP_DigestInit_ex(&ctx, md, NULL);
          EVP_DigestUpdate(&ctx, md_tmp, EVP_MD_size(md));
          EVP_DigestFinal_ex(&ctx, md_tmp, NULL);
      }
      EVP_MD_CTX_cleanup(&ctx);
      OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));
      memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
      OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);
      memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
             EVP_CIPHER_iv_length(cipher));
      EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de);
      OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
      OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
      OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
      return 1;
  }
  