ec_print.c revision 1.13
1/* $OpenBSD: ec_print.c,v 1.13 2023/07/07 13:54:45 beck Exp $ */ 2/* ==================================================================== 3 * Copyright (c) 1998-2002 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 <openssl/crypto.h> 57#include "ec_local.h" 58 59BIGNUM * 60EC_POINT_point2bn(const EC_GROUP *group, const EC_POINT *point, 61 point_conversion_form_t form, BIGNUM *ret, BN_CTX *ctx) 62{ 63 size_t buf_len = 0; 64 unsigned char *buf; 65 66 buf_len = EC_POINT_point2oct(group, point, form, 67 NULL, 0, ctx); 68 if (buf_len == 0) 69 return NULL; 70 71 if ((buf = malloc(buf_len)) == NULL) 72 return NULL; 73 74 if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) { 75 free(buf); 76 return NULL; 77 } 78 ret = BN_bin2bn(buf, buf_len, ret); 79 80 free(buf); 81 82 return ret; 83} 84LCRYPTO_ALIAS(EC_POINT_point2bn); 85 86EC_POINT * 87EC_POINT_bn2point(const EC_GROUP *group, 88 const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx) 89{ 90 size_t buf_len = 0; 91 unsigned char *buf; 92 EC_POINT *ret; 93 94 if ((buf_len = BN_num_bytes(bn)) == 0) 95 return NULL; 96 buf = malloc(buf_len); 97 if (buf == NULL) 98 return NULL; 99 100 if (!BN_bn2bin(bn, buf)) { 101 free(buf); 102 return NULL; 103 } 104 if (point == NULL) { 105 if ((ret = EC_POINT_new(group)) == NULL) { 106 free(buf); 107 return NULL; 108 } 109 } else 110 ret = point; 111 112 if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) { 113 if (point == NULL) 114 EC_POINT_free(ret); 115 free(buf); 116 return NULL; 117 } 118 free(buf); 119 return ret; 120} 121LCRYPTO_ALIAS(EC_POINT_bn2point); 122 123static const char *HEX_DIGITS = "0123456789ABCDEF"; 124 125/* the return value must be freed (using free()) */ 126char * 127EC_POINT_point2hex(const EC_GROUP *group, const EC_POINT *point, 128 point_conversion_form_t form, BN_CTX *ctx) 129{ 130 char *ret, *p; 131 size_t buf_len = 0, i; 132 unsigned char *buf, *pbuf; 133 134 buf_len = EC_POINT_point2oct(group, point, form, 135 NULL, 0, ctx); 136 if (buf_len == 0 || buf_len + 1 == 0) 137 return NULL; 138 139 if ((buf = malloc(buf_len)) == NULL) 140 return NULL; 141 142 if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) { 143 free(buf); 144 return NULL; 145 } 146 ret = reallocarray(NULL, buf_len + 1, 2); 147 if (ret == NULL) { 148 free(buf); 149 return NULL; 150 } 151 p = ret; 152 pbuf = buf; 153 for (i = buf_len; i > 0; i--) { 154 int v = (int) *(pbuf++); 155 *(p++) = HEX_DIGITS[v >> 4]; 156 *(p++) = HEX_DIGITS[v & 0x0F]; 157 } 158 *p = '\0'; 159 160 free(buf); 161 162 return ret; 163} 164LCRYPTO_ALIAS(EC_POINT_point2hex); 165 166EC_POINT * 167EC_POINT_hex2point(const EC_GROUP *group, const char *buf, 168 EC_POINT *point, BN_CTX *ctx) 169{ 170 EC_POINT *ret = NULL; 171 BIGNUM *tmp_bn = NULL; 172 173 if (BN_hex2bn(&tmp_bn, buf) == 0) 174 return NULL; 175 176 ret = EC_POINT_bn2point(group, tmp_bn, point, ctx); 177 178 BN_free(tmp_bn); 179 180 return ret; 181} 182LCRYPTO_ALIAS(EC_POINT_hex2point); 183