1 /* ====================================================================
2 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
55 #include <openssl/crypto.h>
58 BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
59 const EC_POINT *point,
60 point_conversion_form_t form,
61 BIGNUM *ret, BN_CTX *ctx)
66 buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
71 ret = BN_bin2bn(buf, buf_len, ret);
78 EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
79 const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
85 if ((buf_len = BN_num_bytes(bn)) == 0)
87 buf = OPENSSL_malloc(buf_len);
91 if (!BN_bn2bin(bn, buf)) {
97 if ((ret = EC_POINT_new(group)) == NULL) {
104 if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
106 EC_POINT_clear_free(ret);
115 static const char *HEX_DIGITS = "0123456789ABCDEF";
117 /* the return value must be freed (using OPENSSL_free()) */
118 char *EC_POINT_point2hex(const EC_GROUP *group,
119 const EC_POINT *point,
120 point_conversion_form_t form, BN_CTX *ctx)
123 size_t buf_len = 0, i;
124 unsigned char *buf = NULL, *pbuf;
126 buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
131 ret = OPENSSL_malloc(buf_len * 2 + 2);
138 for (i = buf_len; i > 0; i--) {
139 int v = (int)*(pbuf++);
140 *(p++) = HEX_DIGITS[v >> 4];
141 *(p++) = HEX_DIGITS[v & 0x0F];
150 EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
151 const char *buf, EC_POINT *point, BN_CTX *ctx)
153 EC_POINT *ret = NULL;
154 BIGNUM *tmp_bn = NULL;
156 if (!BN_hex2bn(&tmp_bn, buf))
159 ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
161 BN_clear_free(tmp_bn);