evp_pbe.c revision 296465 
1/* evp_pbe.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
61#include "cryptlib.h"
62#include <openssl/evp.h>
63#include <openssl/x509.h>
64
65/* Password based encryption (PBE) functions */
66
67static STACK *pbe_algs;
68
69/* Setup a cipher context from a PBE algorithm */
70
71typedef struct {
72    int pbe_nid;
73    const EVP_CIPHER *cipher;
74    const EVP_MD *md;
75    EVP_PBE_KEYGEN *keygen;
76} EVP_PBE_CTL;
77
78int EVP_PBE_CipherInit(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
79                       ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de)
80{
81
82    EVP_PBE_CTL *pbetmp, pbelu;
83    int i;
84    pbelu.pbe_nid = OBJ_obj2nid(pbe_obj);
85    if (pbelu.pbe_nid != NID_undef)
86        i = sk_find(pbe_algs, (char *)&pbelu);
87    else
88        i = -1;
89
90    if (i == -1) {
91        char obj_tmp[80];
92        EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_PBE_ALGORITHM);
93        if (!pbe_obj)
94            BUF_strlcpy(obj_tmp, "NULL", sizeof obj_tmp);
95        else
96            i2t_ASN1_OBJECT(obj_tmp, sizeof obj_tmp, pbe_obj);
97        ERR_add_error_data(2, "TYPE=", obj_tmp);
98        return 0;
99    }
100    if (!pass)
101        passlen = 0;
102    else if (passlen == -1)
103        passlen = strlen(pass);
104    pbetmp = (EVP_PBE_CTL *)sk_value(pbe_algs, i);
105    i = (*pbetmp->keygen) (ctx, pass, passlen, param, pbetmp->cipher,
106                           pbetmp->md, en_de);
107    if (!i) {
108        EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_KEYGEN_FAILURE);
109        return 0;
110    }
111    return 1;
112}
113
114static int pbe_cmp(const char *const *a, const char *const *b)
115{
116    const EVP_PBE_CTL *const *pbe1 = (const EVP_PBE_CTL *const *)a,
117        *const *pbe2 = (const EVP_PBE_CTL *const *)b;
118    return ((*pbe1)->pbe_nid - (*pbe2)->pbe_nid);
119}
120
121/* Add a PBE algorithm */
122
123int EVP_PBE_alg_add(int nid, const EVP_CIPHER *cipher, const EVP_MD *md,
124                    EVP_PBE_KEYGEN *keygen)
125{
126    EVP_PBE_CTL *pbe_tmp = NULL, pbelu;
127    int i;
128    if (!pbe_algs) {
129        pbe_algs = sk_new(pbe_cmp);
130        if (!pbe_algs) {
131            EVPerr(EVP_F_EVP_PBE_ALG_ADD, ERR_R_MALLOC_FAILURE);
132            return 0;
133        }
134    } else {
135        /* Check if already present */
136        pbelu.pbe_nid = nid;
137        i = sk_find(pbe_algs, (char *)&pbelu);
138        if (i >= 0) {
139            pbe_tmp = (EVP_PBE_CTL *)sk_value(pbe_algs, i);
140            /* If everything identical leave alone */
141            if (pbe_tmp->cipher == cipher
142                && pbe_tmp->md == md && pbe_tmp->keygen == keygen)
143                return 1;
144        }
145    }
146
147    if (!pbe_tmp) {
148        pbe_tmp = OPENSSL_malloc(sizeof(EVP_PBE_CTL));
149        if (!pbe_tmp) {
150            EVPerr(EVP_F_EVP_PBE_ALG_ADD, ERR_R_MALLOC_FAILURE);
151            return 0;
152        }
153        /* If adding a new PBE, set nid, append and sort */
154        pbe_tmp->pbe_nid = nid;
155        sk_push(pbe_algs, (char *)pbe_tmp);
156        sk_sort(pbe_algs);
157    }
158
159    pbe_tmp->cipher = cipher;
160    pbe_tmp->md = md;
161    pbe_tmp->keygen = keygen;
162    return 1;
163}
164
165void EVP_PBE_cleanup(void)
166{
167    sk_pop_free(pbe_algs, OPENSSL_freeFunc);
168    pbe_algs = NULL;
169}
170