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/* If this symbol is defined then ENGINE_get_cipher_engine(), the function that
58 * is used by EVP to hook in cipher code and cache defaults (etc), will display
59 * brief debugging summaries to stderr with the 'nid'. */
60/* #define ENGINE_CIPHER_DEBUG */
61
62static ENGINE_TABLE *cipher_table = NULL;
63
64void ENGINE_unregister_ciphers(ENGINE *e)
65	{
66	engine_table_unregister(&cipher_table, e);
67	}
68
69static void engine_unregister_all_ciphers(void)
70	{
71	engine_table_cleanup(&cipher_table);
72	}
73
74int ENGINE_register_ciphers(ENGINE *e)
75	{
76	if(e->ciphers)
77		{
78		const int *nids;
79		int num_nids = e->ciphers(e, NULL, &nids, 0);
80		if(num_nids > 0)
81			return engine_table_register(&cipher_table,
82					engine_unregister_all_ciphers, e, nids,
83					num_nids, 0);
84		}
85	return 1;
86	}
87
88void ENGINE_register_all_ciphers()
89	{
90	ENGINE *e;
91
92	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
93		ENGINE_register_ciphers(e);
94	}
95
96int ENGINE_set_default_ciphers(ENGINE *e)
97	{
98	if(e->ciphers)
99		{
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, nids,
105					num_nids, 1);
106		}
107	return 1;
108	}
109
110/* Exposed API function to get a functional reference from the implementation
111 * table (ie. try to get a functional reference from the tabled structural
112 * references) for a given cipher 'nid' */
113ENGINE *ENGINE_get_cipher_engine(int nid)
114	{
115	return engine_table_select(&cipher_table, nid);
116	}
117
118/* Obtains a cipher implementation from an ENGINE functional reference */
119const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid)
120	{
121	const EVP_CIPHER *ret;
122	ENGINE_CIPHERS_PTR fn = ENGINE_get_ciphers(e);
123	if(!fn || !fn(e, &ret, NULL, nid))
124		{
125		ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER,
126				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