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/* $OpenBSD: ec_print.c,v 1.12 2023/06/23 10:34:16 tb Exp $ */
/* ====================================================================
* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <openssl/crypto.h>
#include "ec_local.h"
BIGNUM *
EC_POINT_point2bn(const EC_GROUP *group, const EC_POINT *point,
point_conversion_form_t form, BIGNUM *ret, BN_CTX *ctx)
{
size_t buf_len = 0;
unsigned char *buf;
buf_len = EC_POINT_point2oct(group, point, form,
NULL, 0, ctx);
if (buf_len == 0)
return NULL;
if ((buf = malloc(buf_len)) == NULL)
return NULL;
if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {
free(buf);
return NULL;
}
ret = BN_bin2bn(buf, buf_len, ret);
free(buf);
return ret;
}
EC_POINT *
EC_POINT_bn2point(const EC_GROUP *group,
const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
{
size_t buf_len = 0;
unsigned char *buf;
EC_POINT *ret;
if ((buf_len = BN_num_bytes(bn)) == 0)
return NULL;
buf = malloc(buf_len);
if (buf == NULL)
return NULL;
if (!BN_bn2bin(bn, buf)) {
free(buf);
return NULL;
}
if (point == NULL) {
if ((ret = EC_POINT_new(group)) == NULL) {
free(buf);
return NULL;
}
} else
ret = point;
if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
if (point == NULL)
EC_POINT_free(ret);
free(buf);
return NULL;
}
free(buf);
return ret;
}
static const char *HEX_DIGITS = "0123456789ABCDEF";
/* the return value must be freed (using free()) */
char *
EC_POINT_point2hex(const EC_GROUP *group, const EC_POINT *point,
point_conversion_form_t form, BN_CTX *ctx)
{
char *ret, *p;
size_t buf_len = 0, i;
unsigned char *buf, *pbuf;
buf_len = EC_POINT_point2oct(group, point, form,
NULL, 0, ctx);
if (buf_len == 0 || buf_len + 1 == 0)
return NULL;
if ((buf = malloc(buf_len)) == NULL)
return NULL;
if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {
free(buf);
return NULL;
}
ret = reallocarray(NULL, buf_len + 1, 2);
if (ret == NULL) {
free(buf);
return NULL;
}
p = ret;
pbuf = buf;
for (i = buf_len; i > 0; i--) {
int v = (int) *(pbuf++);
*(p++) = HEX_DIGITS[v >> 4];
*(p++) = HEX_DIGITS[v & 0x0F];
}
*p = '\0';
free(buf);
return ret;
}
EC_POINT *
EC_POINT_hex2point(const EC_GROUP *group, const char *buf,
EC_POINT *point, BN_CTX *ctx)
{
EC_POINT *ret = NULL;
BIGNUM *tmp_bn = NULL;
if (BN_hex2bn(&tmp_bn, buf) == 0)
return NULL;
ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
BN_free(tmp_bn);
return ret;
}
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