tb_cipher.c revision 296465 
1/* ====================================================================
2 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in
13 *    the documentation and/or other materials provided with the
14 *    distribution.
15 *
16 * 3. All advertising materials mentioning features or use of this
17 *    software must display the following acknowledgment:
18 *    "This product includes software developed by the OpenSSL Project
19 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
20 *
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 *    endorse or promote products derived from this software without
23 *    prior written permission. For written permission, please contact
24 *    licensing@OpenSSL.org.
25 *
26 * 5. Products derived from this software may not be called "OpenSSL"
27 *    nor may "OpenSSL" appear in their names without prior written
28 *    permission of the OpenSSL Project.
29 *
30 * 6. Redistributions of any form whatsoever must retain the following
31 *    acknowledgment:
32 *    "This product includes software developed by the OpenSSL Project
33 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This product includes cryptographic software written by Eric Young
50 * (eay@cryptsoft.com).  This product includes software written by Tim
51 * Hudson (tjh@cryptsoft.com).
52 *
53 */
54
55#include "eng_int.h"
56
57/*
58 * If this symbol is defined then ENGINE_get_cipher_engine(), the function
59 * that is used by EVP to hook in cipher code and cache defaults (etc), will
60 * display brief debugging summaries to stderr with the 'nid'.
61 */
62/* #define ENGINE_CIPHER_DEBUG */
63
64static ENGINE_TABLE *cipher_table = NULL;
65
66void ENGINE_unregister_ciphers(ENGINE *e)
67{
68    engine_table_unregister(&cipher_table, e);
69}
70
71static void engine_unregister_all_ciphers(void)
72{
73    engine_table_cleanup(&cipher_table);
74}
75
76int ENGINE_register_ciphers(ENGINE *e)
77{
78    if (e->ciphers) {
79        const int *nids;
80        int num_nids = e->ciphers(e, NULL, &nids, 0);
81        if (num_nids > 0)
82            return engine_table_register(&cipher_table,
83                                         engine_unregister_all_ciphers, e,
84                                         nids, num_nids, 0);
85    }
86    return 1;
87}
88
89void ENGINE_register_all_ciphers()
90{
91    ENGINE *e;
92
93    for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
94        ENGINE_register_ciphers(e);
95}
96
97int ENGINE_set_default_ciphers(ENGINE *e)
98{
99    if (e->ciphers) {
100        const int *nids;
101        int num_nids = e->ciphers(e, NULL, &nids, 0);
102        if (num_nids > 0)
103            return engine_table_register(&cipher_table,
104                                         engine_unregister_all_ciphers, e,
105                                         nids, num_nids, 1);
106    }
107    return 1;
108}
109
110/*
111 * Exposed API function to get a functional reference from the implementation
112 * table (ie. try to get a functional reference from the tabled structural
113 * references) for a given cipher 'nid'
114 */
115ENGINE *ENGINE_get_cipher_engine(int nid)
116{
117    return engine_table_select(&cipher_table, nid);
118}
119
120/* Obtains a cipher implementation from an ENGINE functional reference */
121const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid)
122{
123    const EVP_CIPHER *ret;
124    ENGINE_CIPHERS_PTR fn = ENGINE_get_ciphers(e);
125    if (!fn || !fn(e, &ret, NULL, nid)) {
126        ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER, ENGINE_R_UNIMPLEMENTED_CIPHER);
127        return NULL;
128    }
129    return ret;
130}
131
132/* Gets the cipher callback from an ENGINE structure */
133ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e)
134{
135    return e->ciphers;
136}
137
138/* Sets the cipher callback in an ENGINE structure */
139int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f)
140{
141    e->ciphers = f;
142    return 1;
143}
144