text: /* p5_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 "cryptlib.h"
  #include <openssl/asn1_mac.h>
  #include <openssl/x509.h>
  #include <openssl/rand.h>
  
  /* PKCS#5 password based encryption structure */
  
  int i2d_PBEPARAM(PBEPARAM *a, unsigned char **pp)
  {
  	M_ASN1_I2D_vars(a);
  	M_ASN1_I2D_len (a->salt, i2d_ASN1_OCTET_STRING);
  	M_ASN1_I2D_len (a->iter, i2d_ASN1_INTEGER);
  
  	M_ASN1_I2D_seq_total ();
  
  	M_ASN1_I2D_put (a->salt, i2d_ASN1_OCTET_STRING);
  	M_ASN1_I2D_put (a->iter, i2d_ASN1_INTEGER);
  	M_ASN1_I2D_finish();
  }
  
  PBEPARAM *PBEPARAM_new(void)
  {
  	PBEPARAM *ret=NULL;
  	ASN1_CTX c;
  	M_ASN1_New_Malloc(ret, PBEPARAM);
  	M_ASN1_New(ret->iter,M_ASN1_INTEGER_new);
  	M_ASN1_New(ret->salt,M_ASN1_OCTET_STRING_new);
  	return (ret);
  	M_ASN1_New_Error(ASN1_F_PBEPARAM_NEW);
  }
  
  PBEPARAM *d2i_PBEPARAM(PBEPARAM **a, unsigned char **pp, long length)
  {
  	M_ASN1_D2I_vars(a,PBEPARAM *,PBEPARAM_new);
  	M_ASN1_D2I_Init();
  	M_ASN1_D2I_start_sequence();
  	M_ASN1_D2I_get (ret->salt, d2i_ASN1_OCTET_STRING);
  	M_ASN1_D2I_get (ret->iter, d2i_ASN1_INTEGER);
  	M_ASN1_D2I_Finish(a, PBEPARAM_free, ASN1_F_D2I_PBEPARAM);
  }
  
  void PBEPARAM_free (PBEPARAM *a)
  {
  	if(a==NULL) return;
  	M_ASN1_OCTET_STRING_free(a->salt);
  	M_ASN1_INTEGER_free (a->iter);
  	OPENSSL_free (a);
  }
  
  /* Return an algorithm identifier for a PKCS#5 PBE algorithm */
  
  X509_ALGOR *PKCS5_pbe_set(int alg, int iter, unsigned char *salt,
  	     int saltlen)
  {
  	PBEPARAM *pbe;
  	ASN1_OBJECT *al;
  	X509_ALGOR *algor;
  	ASN1_TYPE *astype;
  
  	if (!(pbe = PBEPARAM_new ())) {
  		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
  		return NULL;
  	}
  	if(iter <= 0) iter = PKCS5_DEFAULT_ITER;
  	ASN1_INTEGER_set (pbe->iter, iter);
  	if (!saltlen) saltlen = PKCS5_SALT_LEN;
  	if (!(pbe->salt->data = OPENSSL_malloc (saltlen))) {
  		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
  		return NULL;
  	}
  	pbe->salt->length = saltlen;
  	if (salt) memcpy (pbe->salt->data, salt, saltlen);
  	else if (RAND_pseudo_bytes (pbe->salt->data, saltlen) < 0)
  		return NULL;
  
  	if (!(astype = ASN1_TYPE_new())) {
  		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
  		return NULL;
  	}
  
  	astype->type = V_ASN1_SEQUENCE;
  	if(!ASN1_pack_string(pbe, i2d_PBEPARAM, &astype->value.sequence)) {
  		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
  		return NULL;
  	}
  	PBEPARAM_free (pbe);
  	
  	al = OBJ_nid2obj(alg); /* never need to free al */
  	if (!(algor = X509_ALGOR_new())) {
  		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
  		return NULL;
  	}
  	ASN1_OBJECT_free(algor->algorithm);
  	algor->algorithm = al;
  	algor->parameter = astype;
  
  	return (algor);
  }
  