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/* Doesn't do anything now: Builtin PBE algorithms in static table.
66 */
67
68void PKCS5_PBE_add(void)
69{
70}
71
72int 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	int rv = 0;
86	EVP_MD_CTX_init(&ctx);
87
88	/* Extract useful info from parameter */
89	if (param == NULL || param->type != V_ASN1_SEQUENCE ||
90	    param->value.sequence == NULL) {
91		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
92		return 0;
93	}
94
95	pbuf = param->value.sequence->data;
96	if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
97		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
98		return 0;
99	}
100
101	if (!pbe->iter) iter = 1;
102	else iter = ASN1_INTEGER_get (pbe->iter);
103	salt = pbe->salt->data;
104	saltlen = pbe->salt->length;
105
106	if(!pass) passlen = 0;
107	else if(passlen == -1) passlen = strlen(pass);
108
109	if (!EVP_DigestInit_ex(&ctx, md, NULL))
110		goto err;
111	if (!EVP_DigestUpdate(&ctx, pass, passlen))
112		goto err;
113	if (!EVP_DigestUpdate(&ctx, salt, saltlen))
114		goto err;
115	PBEPARAM_free(pbe);
116	if (!EVP_DigestFinal_ex(&ctx, md_tmp, NULL))
117		goto err;
118	mdsize = EVP_MD_size(md);
119	if (mdsize < 0)
120	    return 0;
121	for (i = 1; i < iter; i++) {
122		if (!EVP_DigestInit_ex(&ctx, md, NULL))
123			goto err;
124		if (!EVP_DigestUpdate(&ctx, md_tmp, mdsize))
125			goto err;
126		if (!EVP_DigestFinal_ex (&ctx, md_tmp, NULL))
127			goto err;
128	}
129	OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));
130	memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
131	OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);
132	memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
133						 EVP_CIPHER_iv_length(cipher));
134	if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
135		goto err;
136	OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
137	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
138	OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
139	rv = 1;
140	err:
141	EVP_MD_CTX_cleanup(&ctx);
142	return rv;
143}
144