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 59#include "../ec/internal.h" 60 61 62ASN1_SEQUENCE(ECDSA_SIG) = { 63 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM), 64 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM), 65} ASN1_SEQUENCE_END(ECDSA_SIG); 66 67DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG); 68DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG); 69IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG); 70 71size_t ECDSA_size(const EC_KEY *key) { 72 size_t ret, i, group_order_size; 73 ASN1_INTEGER bs; 74 BIGNUM *order = NULL; 75 unsigned char buf[4]; 76 const EC_GROUP *group; 77 78 if (key->ecdsa_meth && key->ecdsa_meth->group_order_size) { 79 group_order_size = key->ecdsa_meth->group_order_size(key); 80 } else { 81 size_t num_bits; 82 83 if (key == NULL) { 84 return 0; 85 } 86 group = EC_KEY_get0_group(key); 87 if (group == NULL) { 88 return 0; 89 } 90 91 order = BN_new(); 92 if (order == NULL) { 93 return 0; 94 } 95 if (!EC_GROUP_get_order(group, order, NULL)) { 96 BN_clear_free(order); 97 return 0; 98 } 99 100 num_bits = BN_num_bits(order); 101 group_order_size = (num_bits + 7) / 8; 102 } 103 104 bs.length = group_order_size; 105 bs.data = buf; 106 bs.type = V_ASN1_INTEGER; 107 /* If the top bit is set the ASN.1 encoding is 1 larger. */ 108 buf[0] = 0xff; 109 110 i = i2d_ASN1_INTEGER(&bs, NULL); 111 i += i; /* r and s */ 112 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); 113 BN_clear_free(order); 114 return ret; 115} 116