text: /* evp_pbe.c */
  /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 <openssl/evp.h>
  #include <openssl/x509.h>
  #include "cryptlib.h"
  
  /* Password based encryption (PBE) functions */
  
  static STACK *pbe_algs;
  
  /* Setup a cipher context from a PBE algorithm */
  
  typedef struct {
  int pbe_nid;
  EVP_CIPHER *cipher;
  EVP_MD *md;
  EVP_PBE_KEYGEN *keygen;
  } EVP_PBE_CTL;
  
  int EVP_PBE_CipherInit (ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
  	     ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de)
  {
  
  	EVP_PBE_CTL *pbetmp, pbelu;
  	int i;
  	pbelu.pbe_nid = OBJ_obj2nid(pbe_obj);
  	if (pbelu.pbe_nid != NID_undef) i = sk_find(pbe_algs, (char *)&pbelu);
  	else i = -1;
  
  	if (i == -1) {
  		char obj_tmp[80];
  		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_UNKNOWN_PBE_ALGORITHM);
  		if (!pbe_obj) strcpy (obj_tmp, "NULL");
  		else i2t_ASN1_OBJECT(obj_tmp, 80, pbe_obj);
  		ERR_add_error_data(2, "TYPE=", obj_tmp);
  		return 0;
  	}
  	if (passlen == -1) passlen = strlen(pass);
  	pbetmp = (EVP_PBE_CTL *)sk_value (pbe_algs, i);
  	i = (*pbetmp->keygen)(ctx, pass, passlen, param, pbetmp->cipher,
  						 pbetmp->md, en_de);
  	if (!i) {
  		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_KEYGEN_FAILURE);
  		return 0;
  	}
  	return 1;	
  }
  
  static int pbe_cmp (EVP_PBE_CTL **pbe1, EVP_PBE_CTL **pbe2)
  {
  	return ((*pbe1)->pbe_nid - (*pbe2)->pbe_nid);
  }
  
  /* Add a PBE algorithm */
  
  int EVP_PBE_alg_add (int nid, EVP_CIPHER *cipher, EVP_MD *md,
  	     EVP_PBE_KEYGEN *keygen)
  {
  	EVP_PBE_CTL *pbe_tmp;
  	if (!pbe_algs) pbe_algs = sk_new (pbe_cmp);
  	if (!(pbe_tmp = (EVP_PBE_CTL*) Malloc (sizeof(EVP_PBE_CTL)))) {
  		EVPerr(EVP_F_EVP_PBE_ALG_ADD,ERR_R_MALLOC_FAILURE);
  		return 0;
  	}
  	pbe_tmp->pbe_nid = nid;
  	pbe_tmp->cipher = cipher;
  	pbe_tmp->md = md;
  	pbe_tmp->keygen = keygen;
  	sk_push (pbe_algs, (char *)pbe_tmp);
  	return 1;
  }
  
  void EVP_PBE_cleanup(void)
  {
  	sk_pop_free(pbe_algs, FreeFunc);
  	pbe_algs = NULL;
  }
  