ecs_lib.c revision 160814 
1/* crypto/ecdsa/ecs_lib.c */
2/* ====================================================================
3 * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in
14 *    the documentation and/or other materials provided with the
15 *    distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 *    software must display the following acknowledgment:
19 *    "This product includes software developed by the OpenSSL Project
20 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 *    endorse or promote products derived from this software without
24 *    prior written permission. For written permission, please contact
25 *    openssl-core@OpenSSL.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 *    nor may "OpenSSL" appear in their names without prior written
29 *    permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 *    acknowledgment:
33 *    "This product includes software developed by the OpenSSL Project
34 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com).  This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56#include <string.h>
57#include "ecs_locl.h"
58#ifndef OPENSSL_NO_ENGINE
59#include <openssl/engine.h>
60#endif
61#include <openssl/err.h>
62#include <openssl/bn.h>
63
64const char *ECDSA_version="ECDSA" OPENSSL_VERSION_PTEXT;
65
66static const ECDSA_METHOD *default_ECDSA_method = NULL;
67
68static void *ecdsa_data_new(void);
69static void *ecdsa_data_dup(void *);
70static void  ecdsa_data_free(void *);
71
72void ECDSA_set_default_method(const ECDSA_METHOD *meth)
73{
74	default_ECDSA_method = meth;
75}
76
77const ECDSA_METHOD *ECDSA_get_default_method(void)
78{
79	if(!default_ECDSA_method)
80		default_ECDSA_method = ECDSA_OpenSSL();
81	return default_ECDSA_method;
82}
83
84int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
85{
86        const ECDSA_METHOD *mtmp;
87	ECDSA_DATA *ecdsa;
88
89	ecdsa = ecdsa_check(eckey);
90
91	if (ecdsa == NULL)
92		return 0;
93
94        mtmp = ecdsa->meth;
95#ifndef OPENSSL_NO_ENGINE
96	if (ecdsa->engine)
97	{
98		ENGINE_finish(ecdsa->engine);
99		ecdsa->engine = NULL;
100	}
101#endif
102        ecdsa->meth = meth;
103
104        return 1;
105}
106
107static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)
108{
109	ECDSA_DATA *ret;
110
111	ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));
112	if (ret == NULL)
113	{
114		ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
115		return(NULL);
116	}
117
118	ret->init = NULL;
119
120	ret->meth = ECDSA_get_default_method();
121	ret->engine = engine;
122#ifndef OPENSSL_NO_ENGINE
123	if (!ret->engine)
124		ret->engine = ENGINE_get_default_ECDSA();
125	if (ret->engine)
126	{
127		ret->meth = ENGINE_get_ECDSA(ret->engine);
128		if (!ret->meth)
129		{
130			ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
131			ENGINE_finish(ret->engine);
132			OPENSSL_free(ret);
133			return NULL;
134		}
135	}
136#endif
137
138	ret->flags = ret->meth->flags;
139	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
140#if 0
141	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
142	{
143		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
144		OPENSSL_free(ret);
145		ret=NULL;
146	}
147#endif
148	return(ret);
149}
150
151static void *ecdsa_data_new(void)
152{
153	return (void *)ECDSA_DATA_new_method(NULL);
154}
155
156static void *ecdsa_data_dup(void *data)
157{
158	ECDSA_DATA *r = (ECDSA_DATA *)data;
159
160	/* XXX: dummy operation */
161	if (r == NULL)
162		return NULL;
163
164	return ecdsa_data_new();
165}
166
167static void ecdsa_data_free(void *data)
168{
169	ECDSA_DATA *r = (ECDSA_DATA *)data;
170
171#ifndef OPENSSL_NO_ENGINE
172	if (r->engine)
173		ENGINE_finish(r->engine);
174#endif
175	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
176
177	OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
178
179	OPENSSL_free(r);
180}
181
182ECDSA_DATA *ecdsa_check(EC_KEY *key)
183{
184	ECDSA_DATA *ecdsa_data;
185
186	void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
187					ecdsa_data_free, ecdsa_data_free);
188	if (data == NULL)
189	{
190		ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
191		if (ecdsa_data == NULL)
192			return NULL;
193		EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
194			ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
195	}
196	else
197		ecdsa_data = (ECDSA_DATA *)data;
198
199
200	return ecdsa_data;
201}
202
203int ECDSA_size(const EC_KEY *r)
204{
205	int ret,i;
206	ASN1_INTEGER bs;
207	BIGNUM	*order=NULL;
208	unsigned char buf[4];
209	const EC_GROUP *group;
210
211	if (r == NULL)
212		return 0;
213	group = EC_KEY_get0_group(r);
214	if (group == NULL)
215		return 0;
216
217	if ((order = BN_new()) == NULL) return 0;
218	if (!EC_GROUP_get_order(group,order,NULL))
219	{
220		BN_clear_free(order);
221		return 0;
222	}
223	i=BN_num_bits(order);
224	bs.length=(i+7)/8;
225	bs.data=buf;
226	bs.type=V_ASN1_INTEGER;
227	/* If the top bit is set the asn1 encoding is 1 larger. */
228	buf[0]=0xff;
229
230	i=i2d_ASN1_INTEGER(&bs,NULL);
231	i+=i; /* r and s */
232	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
233	BN_clear_free(order);
234	return(ret);
235}
236
237
238int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
239	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
240{
241	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
242				new_func, dup_func, free_func);
243}
244
245int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
246{
247	ECDSA_DATA *ecdsa;
248	ecdsa = ecdsa_check(d);
249	if (ecdsa == NULL)
250		return 0;
251	return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
252}
253
254void *ECDSA_get_ex_data(EC_KEY *d, int idx)
255{
256	ECDSA_DATA *ecdsa;
257	ecdsa = ecdsa_check(d);
258	if (ecdsa == NULL)
259		return NULL;
260	return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
261}
262