Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |