evp_pbe.c revision 109998 
1/* evp_pbe.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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) strcpy (obj_tmp, "NULL");
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	EVP_PBE_CTL **pbe1 = (EVP_PBE_CTL **) a,  **pbe2 = (EVP_PBE_CTL **)b;
110	return ((*pbe1)->pbe_nid - (*pbe2)->pbe_nid);
111}
112
113/* Add a PBE algorithm */
114
115int EVP_PBE_alg_add(int nid, const EVP_CIPHER *cipher, const EVP_MD *md,
116	     EVP_PBE_KEYGEN *keygen)
117{
118	EVP_PBE_CTL *pbe_tmp;
119	if (!pbe_algs) pbe_algs = sk_new(pbe_cmp);
120	if (!(pbe_tmp = (EVP_PBE_CTL*) OPENSSL_malloc (sizeof(EVP_PBE_CTL)))) {
121		EVPerr(EVP_F_EVP_PBE_ALG_ADD,ERR_R_MALLOC_FAILURE);
122		return 0;
123	}
124	pbe_tmp->pbe_nid = nid;
125	pbe_tmp->cipher = cipher;
126	pbe_tmp->md = md;
127	pbe_tmp->keygen = keygen;
128	sk_push (pbe_algs, (char *)pbe_tmp);
129	return 1;
130}
131
132void EVP_PBE_cleanup(void)
133{
134	sk_pop_free(pbe_algs, OPENSSL_freeFunc);
135	pbe_algs = NULL;
136}
137