1 /* crypto/ec/ec_print.c */ 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_lcl.h" 58 59 BIGNUM *EC_POINT_point2bn(const EC_GROUP *group, 60 const EC_POINT *point, 61 point_conversion_form_t form, 62 BIGNUM *ret, 63 BN_CTX *ctx) 64 { 65 size_t buf_len=0; 66 unsigned char *buf; 67 68 buf_len = EC_POINT_point2oct(group, point, form, 69 NULL, 0, ctx); 70 if (buf_len == 0) 71 return NULL; 72 73 if ((buf = OPENSSL_malloc(buf_len)) == NULL) 74 return NULL; 75 76 if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) 77 { 78 OPENSSL_free(buf); 79 return NULL; 80 } 81 82 ret = BN_bin2bn(buf, buf_len, ret); 83 84 OPENSSL_free(buf); 85 86 return ret; 87 } 88 89 EC_POINT *EC_POINT_bn2point(const EC_GROUP *group, 90 const BIGNUM *bn, 91 EC_POINT *point, 92 BN_CTX *ctx) 93 { 94 size_t buf_len=0; 95 unsigned char *buf; 96 EC_POINT *ret; 97 98 if ((buf_len = BN_num_bytes(bn)) == 0) return NULL; 99 buf = OPENSSL_malloc(buf_len); 100 if (buf == NULL) 101 return NULL; 102 103 if (!BN_bn2bin(bn, buf)) 104 { 105 OPENSSL_free(buf); 106 return NULL; 107 } 108 109 if (point == NULL) 110 { 111 if ((ret = EC_POINT_new(group)) == NULL) 112 { 113 OPENSSL_free(buf); 114 return NULL; 115 } 116 } 117 else 118 ret = point; 119 120 if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) 121 { 122 if (point == NULL) 123 EC_POINT_clear_free(ret); 124 OPENSSL_free(buf); 125 return NULL; 126 } 127 128 OPENSSL_free(buf); 129 return ret; 130 } 131 132 static const char *HEX_DIGITS = "0123456789ABCDEF"; 133 134 /* the return value must be freed (using OPENSSL_free()) */ 135 char *EC_POINT_point2hex(const EC_GROUP *group, 136 const EC_POINT *point, 137 point_conversion_form_t form, 138 BN_CTX *ctx) 139 { 140 char *ret, *p; 141 size_t buf_len=0,i; 142 unsigned char *buf, *pbuf; 143 144 buf_len = EC_POINT_point2oct(group, point, form, 145 NULL, 0, ctx); 146 if (buf_len == 0) 147 return NULL; 148 149 if ((buf = OPENSSL_malloc(buf_len)) == NULL) 150 return NULL; 151 152 if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) 153 { 154 OPENSSL_free(buf); 155 return NULL; 156 } 157 158 ret = (char *)OPENSSL_malloc(buf_len*2+2); 159 if (ret == NULL) 160 { 161 OPENSSL_free(buf); 162 return NULL; 163 } 164 p = ret; 165 pbuf = buf; 166 for (i=buf_len; i > 0; i--) 167 { 168 int v = (int) *(pbuf++); 169 *(p++)=HEX_DIGITS[v>>4]; 170 *(p++)=HEX_DIGITS[v&0x0F]; 171 } 172 *p='\0'; 173 174 OPENSSL_free(buf); 175 176 return ret; 177 } 178 179 EC_POINT *EC_POINT_hex2point(const EC_GROUP *group, 180 const char *buf, 181 EC_POINT *point, 182 BN_CTX *ctx) 183 { 184 EC_POINT *ret=NULL; 185 BIGNUM *tmp_bn=NULL; 186 187 if (!BN_hex2bn(&tmp_bn, buf)) 188 return NULL; 189 190 ret = EC_POINT_bn2point(group, tmp_bn, point, ctx); 191 192 BN_clear_free(tmp_bn); 193 194 return ret; 195 } 196