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#ifdef OPENSSL_FIPS
64#include <openssl/fips.h>
65#endif
66
67const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT;
68
69static const ECDSA_METHOD *default_ECDSA_method = NULL;
70
71static void *ecdsa_data_new(void);
72static void *ecdsa_data_dup(void *);
73static void  ecdsa_data_free(void *);
74
75void ECDSA_set_default_method(const ECDSA_METHOD *meth)
76{
77	default_ECDSA_method = meth;
78}
79
80const ECDSA_METHOD *ECDSA_get_default_method(void)
81{
82	if(!default_ECDSA_method)
83		{
84#ifdef OPENSSL_FIPS
85		if (FIPS_mode())
86			return FIPS_ecdsa_openssl();
87		else
88			return ECDSA_OpenSSL();
89#else
90		default_ECDSA_method = ECDSA_OpenSSL();
91#endif
92		}
93	return default_ECDSA_method;
94}
95
96int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
97{
98	ECDSA_DATA *ecdsa;
99
100	ecdsa = ecdsa_check(eckey);
101
102	if (ecdsa == NULL)
103		return 0;
104
105#ifndef OPENSSL_NO_ENGINE
106	if (ecdsa->engine)
107	{
108		ENGINE_finish(ecdsa->engine);
109		ecdsa->engine = NULL;
110	}
111#endif
112        ecdsa->meth = meth;
113
114        return 1;
115}
116
117static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine)
118{
119	ECDSA_DATA *ret;
120
121	ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA));
122	if (ret == NULL)
123	{
124		ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
125		return(NULL);
126	}
127
128	ret->init = NULL;
129
130	ret->meth = ECDSA_get_default_method();
131	ret->engine = engine;
132#ifndef OPENSSL_NO_ENGINE
133	if (!ret->engine)
134		ret->engine = ENGINE_get_default_ECDSA();
135	if (ret->engine)
136	{
137		ret->meth = ENGINE_get_ECDSA(ret->engine);
138		if (!ret->meth)
139		{
140			ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
141			ENGINE_finish(ret->engine);
142			OPENSSL_free(ret);
143			return NULL;
144		}
145	}
146#endif
147
148	ret->flags = ret->meth->flags;
149	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
150#if 0
151	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
152	{
153		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
154		OPENSSL_free(ret);
155		ret=NULL;
156	}
157#endif
158	return(ret);
159}
160
161static void *ecdsa_data_new(void)
162{
163	return (void *)ECDSA_DATA_new_method(NULL);
164}
165
166static void *ecdsa_data_dup(void *data)
167{
168	ECDSA_DATA *r = (ECDSA_DATA *)data;
169
170	/* XXX: dummy operation */
171	if (r == NULL)
172		return NULL;
173
174	return ecdsa_data_new();
175}
176
177static void ecdsa_data_free(void *data)
178{
179	ECDSA_DATA *r = (ECDSA_DATA *)data;
180
181#ifndef OPENSSL_NO_ENGINE
182	if (r->engine)
183		ENGINE_finish(r->engine);
184#endif
185	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
186
187	OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
188
189	OPENSSL_free(r);
190}
191
192ECDSA_DATA *ecdsa_check(EC_KEY *key)
193{
194	ECDSA_DATA *ecdsa_data;
195
196	void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
197					ecdsa_data_free, ecdsa_data_free);
198	if (data == NULL)
199	{
200		ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
201		if (ecdsa_data == NULL)
202			return NULL;
203		data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
204			   ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
205		if (data != NULL)
206			{
207			/* Another thread raced us to install the key_method
208			 * data and won. */
209			ecdsa_data_free(ecdsa_data);
210			ecdsa_data = (ECDSA_DATA *)data;
211			}
212	}
213	else
214		ecdsa_data = (ECDSA_DATA *)data;
215#ifdef OPENSSL_FIPS
216	if (FIPS_mode() && !(ecdsa_data->flags & ECDSA_FLAG_FIPS_METHOD)
217			&& !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW))
218		{
219		ECDSAerr(ECDSA_F_ECDSA_CHECK, ECDSA_R_NON_FIPS_METHOD);
220		return NULL;
221		}
222#endif
223
224	return ecdsa_data;
225}
226
227int ECDSA_size(const EC_KEY *r)
228{
229	int ret,i;
230	ASN1_INTEGER bs;
231	BIGNUM	*order=NULL;
232	unsigned char buf[4];
233	const EC_GROUP *group;
234
235	if (r == NULL)
236		return 0;
237	group = EC_KEY_get0_group(r);
238	if (group == NULL)
239		return 0;
240
241	if ((order = BN_new()) == NULL) return 0;
242	if (!EC_GROUP_get_order(group,order,NULL))
243	{
244		BN_clear_free(order);
245		return 0;
246	}
247	i=BN_num_bits(order);
248	bs.length=(i+7)/8;
249	bs.data=buf;
250	bs.type=V_ASN1_INTEGER;
251	/* If the top bit is set the asn1 encoding is 1 larger. */
252	buf[0]=0xff;
253
254	i=i2d_ASN1_INTEGER(&bs,NULL);
255	i+=i; /* r and s */
256	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
257	BN_clear_free(order);
258	return(ret);
259}
260
261
262int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
263	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
264{
265	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
266				new_func, dup_func, free_func);
267}
268
269int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
270{
271	ECDSA_DATA *ecdsa;
272	ecdsa = ecdsa_check(d);
273	if (ecdsa == NULL)
274		return 0;
275	return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg));
276}
277
278void *ECDSA_get_ex_data(EC_KEY *d, int idx)
279{
280	ECDSA_DATA *ecdsa;
281	ecdsa = ecdsa_check(d);
282	if (ecdsa == NULL)
283		return NULL;
284	return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx));
285}
286