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	ECDSA_DATA *ecdsa;
87
88	ecdsa = ecdsa_check(eckey);
89
90	if (ecdsa == NULL)
91		return 0;
92
93#ifndef OPENSSL_NO_ENGINE
94	if (ecdsa->engine)
95	{
96		ENGINE_finish(ecdsa->engine);
97		ecdsa->engine = NULL;
98	}
99#endif
100        ecdsa->meth = meth;
101
102        return 1;
103}
104
105static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)
106{
107	ECDSA_DATA *ret;
108
109	ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));
110	if (ret == NULL)
111	{
112		ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
113		return(NULL);
114	}
115
116	ret->init = NULL;
117
118	ret->meth = ECDSA_get_default_method();
119	ret->engine = engine;
120#ifndef OPENSSL_NO_ENGINE
121	if (!ret->engine)
122		ret->engine = ENGINE_get_default_ECDSA();
123	if (ret->engine)
124	{
125		ret->meth = ENGINE_get_ECDSA(ret->engine);
126		if (!ret->meth)
127		{
128			ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
129			ENGINE_finish(ret->engine);
130			OPENSSL_free(ret);
131			return NULL;
132		}
133	}
134#endif
135
136	ret->flags = ret->meth->flags;
137	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
138#if 0
139	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
140	{
141		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
142		OPENSSL_free(ret);
143		ret=NULL;
144	}
145#endif
146	return(ret);
147}
148
149static void *ecdsa_data_new(void)
150{
151	return (void *)ECDSA_DATA_new_method(NULL);
152}
153
154static void *ecdsa_data_dup(void *data)
155{
156	ECDSA_DATA *r = (ECDSA_DATA *)data;
157
158	/* XXX: dummy operation */
159	if (r == NULL)
160		return NULL;
161
162	return ecdsa_data_new();
163}
164
165static void ecdsa_data_free(void *data)
166{
167	ECDSA_DATA *r = (ECDSA_DATA *)data;
168
169#ifndef OPENSSL_NO_ENGINE
170	if (r->engine)
171		ENGINE_finish(r->engine);
172#endif
173	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
174
175	OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
176
177	OPENSSL_free(r);
178}
179
180ECDSA_DATA *ecdsa_check(EC_KEY *key)
181{
182	ECDSA_DATA *ecdsa_data;
183
184	void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
185					ecdsa_data_free, ecdsa_data_free);
186	if (data == NULL)
187	{
188		ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
189		if (ecdsa_data == NULL)
190			return NULL;
191		data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
192			   ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
193		if (data != NULL)
194			{
195			/* Another thread raced us to install the key_method
196			 * data and won. */
197			ecdsa_data_free(ecdsa_data);
198			ecdsa_data = (ECDSA_DATA *)data;
199			}
200	}
201	else
202		ecdsa_data = (ECDSA_DATA *)data;
203
204
205	return ecdsa_data;
206}
207
208int ECDSA_size(const EC_KEY *r)
209{
210	int ret,i;
211	ASN1_INTEGER bs;
212	BIGNUM	*order=NULL;
213	unsigned char buf[4];
214	const EC_GROUP *group;
215
216	if (r == NULL)
217		return 0;
218	group = EC_KEY_get0_group(r);
219	if (group == NULL)
220		return 0;
221
222	if ((order = BN_new()) == NULL) return 0;
223	if (!EC_GROUP_get_order(group,order,NULL))
224	{
225		BN_clear_free(order);
226		return 0;
227	}
228	i=BN_num_bits(order);
229	bs.length=(i+7)/8;
230	bs.data=buf;
231	bs.type=V_ASN1_INTEGER;
232	/* If the top bit is set the asn1 encoding is 1 larger. */
233	buf[0]=0xff;
234
235	i=i2d_ASN1_INTEGER(&bs,NULL);
236	i+=i; /* r and s */
237	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
238	BN_clear_free(order);
239	return(ret);
240}
241
242
243int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
244	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
245{
246	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
247				new_func, dup_func, free_func);
248}
249
250int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
251{
252	ECDSA_DATA *ecdsa;
253	ecdsa = ecdsa_check(d);
254	if (ecdsa == NULL)
255		return 0;
256	return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
257}
258
259void *ECDSA_get_ex_data(EC_KEY *d, int idx)
260{
261	ECDSA_DATA *ecdsa;
262	ecdsa = ecdsa_check(d);
263	if (ecdsa == NULL)
264		return NULL;
265	return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
266}
267