p5_crpt.c revision 194206 
1/* p5_crpt.c */
2/* Written by Dr Stephen N Henson (steve@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@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@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@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/* PKCS#5 v1.5 compatible PBE functions: see PKCS#5 v2.0 for more info.
66 */
67
68void PKCS5_PBE_add(void)
69{
70#ifndef OPENSSL_NO_DES
71#  ifndef OPENSSL_NO_MD5
72EVP_PBE_alg_add(NID_pbeWithMD5AndDES_CBC, EVP_des_cbc(), EVP_md5(),
73							 PKCS5_PBE_keyivgen);
74#  endif
75#  ifndef OPENSSL_NO_MD2
76EVP_PBE_alg_add(NID_pbeWithMD2AndDES_CBC, EVP_des_cbc(), EVP_md2(),
77							 PKCS5_PBE_keyivgen);
78#  endif
79#  ifndef OPENSSL_NO_SHA
80EVP_PBE_alg_add(NID_pbeWithSHA1AndDES_CBC, EVP_des_cbc(), EVP_sha1(),
81							 PKCS5_PBE_keyivgen);
82#  endif
83#endif
84#ifndef OPENSSL_NO_RC2
85#  ifndef OPENSSL_NO_MD5
86EVP_PBE_alg_add(NID_pbeWithMD5AndRC2_CBC, EVP_rc2_64_cbc(), EVP_md5(),
87							 PKCS5_PBE_keyivgen);
88#  endif
89#  ifndef OPENSSL_NO_MD2
90EVP_PBE_alg_add(NID_pbeWithMD2AndRC2_CBC, EVP_rc2_64_cbc(), EVP_md2(),
91							 PKCS5_PBE_keyivgen);
92#  endif
93#  ifndef OPENSSL_NO_SHA
94EVP_PBE_alg_add(NID_pbeWithSHA1AndRC2_CBC, EVP_rc2_64_cbc(), EVP_sha1(),
95							 PKCS5_PBE_keyivgen);
96#  endif
97#endif
98#ifndef OPENSSL_NO_HMAC
99EVP_PBE_alg_add(NID_pbes2, NULL, NULL, PKCS5_v2_PBE_keyivgen);
100#endif
101}
102
103int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
104			 ASN1_TYPE *param, const EVP_CIPHER *cipher, const EVP_MD *md,
105			 int en_de)
106{
107	EVP_MD_CTX ctx;
108	unsigned char md_tmp[EVP_MAX_MD_SIZE];
109	unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
110	int i;
111	PBEPARAM *pbe;
112	int saltlen, iter;
113	unsigned char *salt;
114	const unsigned char *pbuf;
115
116	/* Extract useful info from parameter */
117	if (param == NULL || param->type != V_ASN1_SEQUENCE ||
118	    param->value.sequence == NULL) {
119		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
120		return 0;
121	}
122
123	pbuf = param->value.sequence->data;
124	if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
125		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
126		return 0;
127	}
128
129	if (!pbe->iter) iter = 1;
130	else iter = ASN1_INTEGER_get (pbe->iter);
131	salt = pbe->salt->data;
132	saltlen = pbe->salt->length;
133
134	if(!pass) passlen = 0;
135	else if(passlen == -1) passlen = strlen(pass);
136
137	EVP_MD_CTX_init(&ctx);
138	EVP_DigestInit_ex(&ctx, md, NULL);
139	EVP_DigestUpdate(&ctx, pass, passlen);
140	EVP_DigestUpdate(&ctx, salt, saltlen);
141	PBEPARAM_free(pbe);
142	EVP_DigestFinal_ex(&ctx, md_tmp, NULL);
143	for (i = 1; i < iter; i++) {
144		EVP_DigestInit_ex(&ctx, md, NULL);
145		EVP_DigestUpdate(&ctx, md_tmp, EVP_MD_size(md));
146		EVP_DigestFinal_ex (&ctx, md_tmp, NULL);
147	}
148	EVP_MD_CTX_cleanup(&ctx);
149	OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));
150	memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
151	OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);
152	memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
153						 EVP_CIPHER_iv_length(cipher));
154	EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de);
155	OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
156	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
157	OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
158	return 1;
159}
160