1 /* $OpenBSD: ecs_lib.c,v 1.12 2017/05/02 03:59:44 deraadt Exp $ */
2 /* ====================================================================
3 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
58 #include <openssl/opensslconf.h>
61 #ifndef OPENSSL_NO_ENGINE
62 #include <openssl/engine.h>
64 #include <openssl/err.h>
65 #include <openssl/bn.h>
67 static const ECDSA_METHOD
*default_ECDSA_method
= NULL
;
69 static void *ecdsa_data_new(void);
70 static void *ecdsa_data_dup(void *);
71 static void ecdsa_data_free(void *);
74 ECDSA_set_default_method(const ECDSA_METHOD
*meth
)
76 default_ECDSA_method
= meth
;
80 ECDSA_get_default_method(void)
82 if (!default_ECDSA_method
) {
83 default_ECDSA_method
= ECDSA_OpenSSL();
85 return default_ECDSA_method
;
89 ECDSA_set_method(EC_KEY
*eckey
, const ECDSA_METHOD
*meth
)
93 ecdsa
= ecdsa_check(eckey
);
98 #ifndef OPENSSL_NO_ENGINE
100 ENGINE_finish(ecdsa
->engine
);
101 ecdsa
->engine
= NULL
;
110 ECDSA_DATA_new_method(ENGINE
*engine
)
114 ret
= malloc(sizeof(ECDSA_DATA
));
116 ECDSAerror(ERR_R_MALLOC_FAILURE
);
122 ret
->meth
= ECDSA_get_default_method();
123 ret
->engine
= engine
;
124 #ifndef OPENSSL_NO_ENGINE
126 ret
->engine
= ENGINE_get_default_ECDSA();
128 ret
->meth
= ENGINE_get_ECDSA(ret
->engine
);
130 ECDSAerror(ERR_R_ENGINE_LIB
);
131 ENGINE_finish(ret
->engine
);
138 ret
->flags
= ret
->meth
->flags
;
139 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA
, ret
, &ret
->ex_data
);
146 return (void *)ECDSA_DATA_new_method(NULL
);
150 ecdsa_data_dup(void *data
)
152 ECDSA_DATA
*r
= (ECDSA_DATA
*)data
;
154 /* XXX: dummy operation */
158 return ecdsa_data_new();
162 ecdsa_data_free(void *data
)
164 ECDSA_DATA
*r
= (ECDSA_DATA
*)data
;
166 #ifndef OPENSSL_NO_ENGINE
168 ENGINE_finish(r
->engine
);
170 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA
, r
, &r
->ex_data
);
172 freezero(r
, sizeof(ECDSA_DATA
));
176 ecdsa_check(EC_KEY
*key
)
178 ECDSA_DATA
*ecdsa_data
;
180 void *data
= EC_KEY_get_key_method_data(key
, ecdsa_data_dup
,
181 ecdsa_data_free
, ecdsa_data_free
);
183 ecdsa_data
= (ECDSA_DATA
*)ecdsa_data_new();
184 if (ecdsa_data
== NULL
)
186 data
= EC_KEY_insert_key_method_data(key
, (void *)ecdsa_data
,
187 ecdsa_data_dup
, ecdsa_data_free
, ecdsa_data_free
);
189 /* Another thread raced us to install the key_method
191 ecdsa_data_free(ecdsa_data
);
192 ecdsa_data
= (ECDSA_DATA
*)data
;
195 ecdsa_data
= (ECDSA_DATA
*)data
;
201 ECDSA_size(const EC_KEY
*r
)
205 BIGNUM
*order
= NULL
;
206 unsigned char buf
[4];
207 const EC_GROUP
*group
;
211 group
= EC_KEY_get0_group(r
);
215 if ((order
= BN_new()) == NULL
)
217 if (!EC_GROUP_get_order(group
, order
, NULL
)) {
218 BN_clear_free(order
);
221 i
= BN_num_bits(order
);
222 bs
.length
= (i
+ 7) / 8;
224 bs
.type
= V_ASN1_INTEGER
;
225 /* If the top bit is set the asn1 encoding is 1 larger. */
228 i
= i2d_ASN1_INTEGER(&bs
, NULL
);
229 i
+= i
; /* r and s */
230 ret
= ASN1_object_size(1, i
, V_ASN1_SEQUENCE
);
231 BN_clear_free(order
);
236 ECDSA_get_ex_new_index(long argl
, void *argp
, CRYPTO_EX_new
*new_func
,
237 CRYPTO_EX_dup
*dup_func
, CRYPTO_EX_free
*free_func
)
239 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA
, argl
, argp
,
240 new_func
, dup_func
, free_func
);
244 ECDSA_set_ex_data(EC_KEY
*d
, int idx
, void *arg
)
247 ecdsa
= ecdsa_check(d
);
250 return (CRYPTO_set_ex_data(&ecdsa
->ex_data
, idx
, arg
));
254 ECDSA_get_ex_data(EC_KEY
*d
, int idx
)
257 ecdsa
= ecdsa_check(d
);
260 return (CRYPTO_get_ex_data(&ecdsa
->ex_data
, idx
));