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/* ====================================================================
* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/ecdsa.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/ec_key.h>
#include "../ec/internal.h"
DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG);
DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG);
ASN1_SEQUENCE(ECDSA_SIG) = {
ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM),
} ASN1_SEQUENCE_END(ECDSA_SIG);
IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG);
size_t ECDSA_size(const EC_KEY *key) {
size_t ret, i, group_order_size;
ASN1_INTEGER bs;
BIGNUM *order = NULL;
unsigned char buf[4];
const EC_GROUP *group;
if (key->ecdsa_meth && key->ecdsa_meth->group_order_size) {
group_order_size = key->ecdsa_meth->group_order_size(key);
} else {
size_t num_bits;
if (key == NULL) {
return 0;
}
group = EC_KEY_get0_group(key);
if (group == NULL) {
return 0;
}
order = BN_new();
if (order == NULL) {
return 0;
}
if (!EC_GROUP_get_order(group, order, NULL)) {
BN_clear_free(order);
return 0;
}
num_bits = BN_num_bits(order);
group_order_size = (num_bits + 7) / 8;
}
bs.length = group_order_size;
bs.data = buf;
bs.type = V_ASN1_INTEGER;
/* If the top bit is set the ASN.1 encoding is 1 larger. */
buf[0] = 0xff;
i = i2d_ASN1_INTEGER(&bs, NULL);
i += i; /* r and s */
ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
BN_clear_free(order);
return ret;
}
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