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      1 /* p5_crpt.c */
      2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      3  * project 1999.
      4  */
      5 /* ====================================================================
      6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in
     17  *    the documentation and/or other materials provided with the
     18  *    distribution.
     19  *
     20  * 3. All advertising materials mentioning features or use of this
     21  *    software must display the following acknowledgment:
     22  *    "This product includes software developed by the OpenSSL Project
     23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     24  *
     25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     26  *    endorse or promote products derived from this software without
     27  *    prior written permission. For written permission, please contact
     28  *    licensing (at) OpenSSL.org.
     29  *
     30  * 5. Products derived from this software may not be called "OpenSSL"
     31  *    nor may "OpenSSL" appear in their names without prior written
     32  *    permission of the OpenSSL Project.
     33  *
     34  * 6. Redistributions of any form whatsoever must retain the following
     35  *    acknowledgment:
     36  *    "This product includes software developed by the OpenSSL Project
     37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     38  *
     39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     50  * OF THE POSSIBILITY OF SUCH DAMAGE.
     51  * ====================================================================
     52  *
     53  * This product includes cryptographic software written by Eric Young
     54  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     55  * Hudson (tjh (at) cryptsoft.com).
     56  *
     57  */
     58 
     59 #include <stdio.h>
     60 #include <stdlib.h>
     61 #include "cryptlib.h"
     62 #include <openssl/x509.h>
     63 #include <openssl/evp.h>
     64 
     65 /* Doesn't do anything now: Builtin PBE algorithms in static table.
     66  */
     67 
     68 void PKCS5_PBE_add(void)
     69 {
     70 }
     71 
     72 int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
     73 			 ASN1_TYPE *param, const EVP_CIPHER *cipher, const EVP_MD *md,
     74 			 int en_de)
     75 {
     76 	EVP_MD_CTX ctx;
     77 	unsigned char md_tmp[EVP_MAX_MD_SIZE];
     78 	unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
     79 	int i;
     80 	PBEPARAM *pbe;
     81 	int saltlen, iter;
     82 	unsigned char *salt;
     83 	const unsigned char *pbuf;
     84 	int mdsize;
     85 
     86 	/* Extract useful info from parameter */
     87 	if (param == NULL || param->type != V_ASN1_SEQUENCE ||
     88 	    param->value.sequence == NULL) {
     89 		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
     90 		return 0;
     91 	}
     92 
     93 	pbuf = param->value.sequence->data;
     94 	if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
     95 		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
     96 		return 0;
     97 	}
     98 
     99 	if (!pbe->iter) iter = 1;
    100 	else iter = ASN1_INTEGER_get (pbe->iter);
    101 	salt = pbe->salt->data;
    102 	saltlen = pbe->salt->length;
    103 
    104 	if(!pass) passlen = 0;
    105 	else if(passlen == -1) passlen = strlen(pass);
    106 
    107 	EVP_MD_CTX_init(&ctx);
    108 	EVP_DigestInit_ex(&ctx, md, NULL);
    109 	EVP_DigestUpdate(&ctx, pass, passlen);
    110 	EVP_DigestUpdate(&ctx, salt, saltlen);
    111 	PBEPARAM_free(pbe);
    112 	EVP_DigestFinal_ex(&ctx, md_tmp, NULL);
    113 	mdsize = EVP_MD_size(md);
    114 	if (mdsize < 0)
    115 	    return 0;
    116 	for (i = 1; i < iter; i++) {
    117 		EVP_DigestInit_ex(&ctx, md, NULL);
    118 		EVP_DigestUpdate(&ctx, md_tmp, mdsize);
    119 		EVP_DigestFinal_ex (&ctx, md_tmp, NULL);
    120 	}
    121 	EVP_MD_CTX_cleanup(&ctx);
    122 	OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));
    123 	memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
    124 	OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);
    125 	memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
    126 						 EVP_CIPHER_iv_length(cipher));
    127 	EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de);
    128 	OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
    129 	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
    130 	OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
    131 	return 1;
    132 }
    133