1/* evp_pbe.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 "cryptlib.h"
61#include <openssl/evp.h>
62#include <openssl/x509.h>
63
64/* Password based encryption (PBE) functions */
65
66static STACK *pbe_algs;
67
68/* Setup a cipher context from a PBE algorithm */
69
70typedef struct {
71int pbe_nid;
72const EVP_CIPHER *cipher;
73const EVP_MD *md;
74EVP_PBE_KEYGEN *keygen;
75} EVP_PBE_CTL;
76
77int EVP_PBE_CipherInit(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
78	     ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de)
79{
80
81	EVP_PBE_CTL *pbetmp, pbelu;
82	int i;
83	pbelu.pbe_nid = OBJ_obj2nid(pbe_obj);
84	if (pbelu.pbe_nid != NID_undef) i = sk_find(pbe_algs, (char *)&pbelu);
85	else i = -1;
86
87	if (i == -1) {
88		char obj_tmp[80];
89		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_UNKNOWN_PBE_ALGORITHM);
90		if (!pbe_obj) BUF_strlcpy (obj_tmp, "NULL", sizeof obj_tmp);
91		else i2t_ASN1_OBJECT(obj_tmp, sizeof obj_tmp, pbe_obj);
92		ERR_add_error_data(2, "TYPE=", obj_tmp);
93		return 0;
94	}
95	if(!pass) passlen = 0;
96	else if (passlen == -1) passlen = strlen(pass);
97	pbetmp = (EVP_PBE_CTL *)sk_value (pbe_algs, i);
98	i = (*pbetmp->keygen)(ctx, pass, passlen, param, pbetmp->cipher,
99						 pbetmp->md, en_de);
100	if (!i) {
101		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_KEYGEN_FAILURE);
102		return 0;
103	}
104	return 1;
105}
106
107static int pbe_cmp(const char * const *a, const char * const *b)
108{
109	const EVP_PBE_CTL * const *pbe1 = (const EVP_PBE_CTL * const *) a,
110			* const *pbe2 = (const EVP_PBE_CTL * const *)b;
111	return ((*pbe1)->pbe_nid - (*pbe2)->pbe_nid);
112}
113
114/* Add a PBE algorithm */
115
116int EVP_PBE_alg_add(int nid, const EVP_CIPHER *cipher, const EVP_MD *md,
117	     EVP_PBE_KEYGEN *keygen)
118{
119	EVP_PBE_CTL *pbe_tmp = NULL, pbelu;
120	int i;
121	if (!pbe_algs)
122		{
123		pbe_algs = sk_new(pbe_cmp);
124		if (!pbe_algs)
125			{
126			EVPerr(EVP_F_EVP_PBE_ALG_ADD,ERR_R_MALLOC_FAILURE);
127			return 0;
128			}
129		}
130	else
131		{
132		/* Check if already present */
133		pbelu.pbe_nid = nid;
134		i = sk_find(pbe_algs, (char *)&pbelu);
135		if (i >= 0)
136			{
137			pbe_tmp = (EVP_PBE_CTL *)sk_value(pbe_algs, i);
138			/* If everything identical leave alone */
139			if (pbe_tmp->cipher == cipher
140				&& pbe_tmp->md == md
141				&& pbe_tmp->keygen == keygen)
142				return 1;
143			}
144		}
145
146	if (!pbe_tmp)
147		{
148		pbe_tmp = OPENSSL_malloc (sizeof(EVP_PBE_CTL));
149		if (!pbe_tmp)
150			{
151			EVPerr(EVP_F_EVP_PBE_ALG_ADD,ERR_R_MALLOC_FAILURE);
152			return 0;
153			}
154		/* If adding a new PBE, set nid, append and sort */
155		pbe_tmp->pbe_nid = nid;
156		sk_push (pbe_algs, (char *)pbe_tmp);
157		sk_sort(pbe_algs);
158		}
159
160	pbe_tmp->cipher = cipher;
161	pbe_tmp->md = md;
162	pbe_tmp->keygen = keygen;
163	return 1;
164}
165
166void EVP_PBE_cleanup(void)
167{
168	sk_pop_free(pbe_algs, OPENSSL_freeFunc);
169	pbe_algs = NULL;
170}
171