1 /* ====================================================================
2 * Copyright (c) 1998-2005 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 * openssl-core@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 #include <openssl/ecdsa.h>
54
55 #include <openssl/asn1.h>
56 #include <openssl/asn1t.h>
57 #include <openssl/ec_key.h>
58 #include <openssl/mem.h>
59
60 #include "../ec/internal.h"
61
62
63 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG);
64 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG);
65
66 ASN1_SEQUENCE(ECDSA_SIG) = {
67 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
68 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM),
69 } ASN1_SEQUENCE_END(ECDSA_SIG);
70
71 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG);
72
ECDSA_size(const EC_KEY * key)73 size_t ECDSA_size(const EC_KEY *key) {
74 size_t ret, i, group_order_size;
75 ASN1_INTEGER bs;
76 BIGNUM *order = NULL;
77 unsigned char buf[4];
78 const EC_GROUP *group;
79
80 if (key->ecdsa_meth && key->ecdsa_meth->group_order_size) {
81 group_order_size = key->ecdsa_meth->group_order_size(key);
82 } else {
83 size_t num_bits;
84
85 if (key == NULL) {
86 return 0;
87 }
88 group = EC_KEY_get0_group(key);
89 if (group == NULL) {
90 return 0;
91 }
92
93 order = BN_new();
94 if (order == NULL) {
95 return 0;
96 }
97 if (!EC_GROUP_get_order(group, order, NULL)) {
98 BN_clear_free(order);
99 return 0;
100 }
101
102 num_bits = BN_num_bits(order);
103 group_order_size = (num_bits + 7) / 8;
104 }
105
106 bs.length = group_order_size;
107 bs.data = buf;
108 bs.type = V_ASN1_INTEGER;
109 /* If the top bit is set the ASN.1 encoding is 1 larger. */
110 buf[0] = 0xff;
111
112 i = i2d_ASN1_INTEGER(&bs, NULL);
113 i += i; /* r and s */
114 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
115 BN_clear_free(order);
116 return ret;
117 }
118
ECDSA_SIG_new(void)119 ECDSA_SIG *ECDSA_SIG_new(void) {
120 ECDSA_SIG *sig = OPENSSL_malloc(sizeof(ECDSA_SIG));
121 if (sig == NULL) {
122 return NULL;
123 }
124 sig->r = BN_new();
125 sig->s = BN_new();
126 if (sig->r == NULL || sig->s == NULL) {
127 ECDSA_SIG_free(sig);
128 return NULL;
129 }
130 return sig;
131 }
132
ECDSA_SIG_free(ECDSA_SIG * sig)133 void ECDSA_SIG_free(ECDSA_SIG *sig) {
134 if (sig == NULL) {
135 return;
136 }
137
138 BN_free(sig->r);
139 BN_free(sig->s);
140 OPENSSL_free(sig);
141 }
142