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180 lines
5.4 KiB
C
180 lines
5.4 KiB
C
/* crypto/ec/ec_print.c */
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/* ====================================================================
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* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <openssl/crypto.h>
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#include "ec_lcl.h"
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BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
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const EC_POINT *point,
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point_conversion_form_t form,
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BIGNUM *ret, BN_CTX *ctx)
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{
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size_t buf_len = 0;
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unsigned char *buf;
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buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);
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if (buf_len == 0)
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return NULL;
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if ((buf = OPENSSL_malloc(buf_len)) == NULL)
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return NULL;
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if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {
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OPENSSL_free(buf);
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return NULL;
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}
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ret = BN_bin2bn(buf, buf_len, ret);
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OPENSSL_free(buf);
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return ret;
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}
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EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
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const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
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{
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size_t buf_len = 0;
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unsigned char *buf;
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EC_POINT *ret;
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if ((buf_len = BN_num_bytes(bn)) == 0)
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return NULL;
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buf = OPENSSL_malloc(buf_len);
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if (buf == NULL)
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return NULL;
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if (!BN_bn2bin(bn, buf)) {
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OPENSSL_free(buf);
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return NULL;
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}
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if (point == NULL) {
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if ((ret = EC_POINT_new(group)) == NULL) {
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OPENSSL_free(buf);
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return NULL;
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}
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} else
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ret = point;
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if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
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if (point == NULL)
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EC_POINT_clear_free(ret);
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OPENSSL_free(buf);
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return NULL;
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}
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OPENSSL_free(buf);
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return ret;
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}
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static const char *HEX_DIGITS = "0123456789ABCDEF";
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/* the return value must be freed (using OPENSSL_free()) */
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char *EC_POINT_point2hex(const EC_GROUP *group,
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const EC_POINT *point,
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point_conversion_form_t form, BN_CTX *ctx)
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{
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char *ret, *p;
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size_t buf_len = 0, i;
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unsigned char *buf, *pbuf;
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buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);
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if (buf_len == 0)
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return NULL;
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if ((buf = OPENSSL_malloc(buf_len)) == NULL)
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return NULL;
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if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {
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OPENSSL_free(buf);
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return NULL;
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}
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ret = (char *)OPENSSL_malloc(buf_len * 2 + 2);
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if (ret == NULL) {
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OPENSSL_free(buf);
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return NULL;
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}
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p = ret;
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pbuf = buf;
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for (i = buf_len; i > 0; i--) {
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int v = (int)*(pbuf++);
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*(p++) = HEX_DIGITS[v >> 4];
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*(p++) = HEX_DIGITS[v & 0x0F];
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}
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*p = '\0';
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OPENSSL_free(buf);
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return ret;
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}
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EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
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const char *buf, EC_POINT *point, BN_CTX *ctx)
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{
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EC_POINT *ret = NULL;
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BIGNUM *tmp_bn = NULL;
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if (!BN_hex2bn(&tmp_bn, buf))
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return NULL;
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ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
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BN_clear_free(tmp_bn);
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return ret;
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}
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