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 <openssl/evp.h>
56#include <openssl/engine.h>
57#include "eng_int.h"
58
59/* If this symbol is defined then ENGINE_get_cipher_engine(), the function that
60 * is used by EVP to hook in cipher code and cache defaults (etc), will display
61 * brief debugging summaries to stderr with the 'nid'. */
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		{
80		const int *nids;
81		int num_nids = e->ciphers(e, NULL, &nids, 0);
82		if(num_nids > 0)
83			return engine_table_register(&cipher_table,
84					engine_unregister_all_ciphers, e, nids,
85					num_nids, 0);
86		}
87	return 1;
88	}
89
90void ENGINE_register_all_ciphers()
91	{
92	ENGINE *e;
93
94	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
95		ENGINE_register_ciphers(e);
96	}
97
98int ENGINE_set_default_ciphers(ENGINE *e)
99	{
100	if(e->ciphers)
101		{
102		const int *nids;
103		int num_nids = e->ciphers(e, NULL, &nids, 0);
104		if(num_nids > 0)
105			return engine_table_register(&cipher_table,
106					engine_unregister_all_ciphers, e, nids,
107					num_nids, 1);
108		}
109	return 1;
110	}
111
112/* Exposed API function to get a functional reference from the implementation
113 * table (ie. try to get a functional reference from the tabled structural
114 * references) for a given cipher 'nid' */
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		{
127		ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER,
128				ENGINE_R_UNIMPLEMENTED_CIPHER);
129		return NULL;
130		}
131	return ret;
132	}
133
134/* Gets the cipher callback from an ENGINE structure */
135ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e)
136	{
137	return e->ciphers;
138	}
139
140/* Sets the cipher callback in an ENGINE structure */
141int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f)
142	{
143	e->ciphers = f;
144	return 1;
145	}
146