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/*
* Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/crypto.h>
#include "ec_lcl.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_point2buf(group, point, form, &buf, ctx);
if (buf_len == 0)
return NULL;
ret = BN_bin2bn(buf, buf_len, ret);
OPENSSL_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 = OPENSSL_malloc(buf_len);
if (buf == NULL)
return NULL;
if (!BN_bn2bin(bn, buf)) {
OPENSSL_free(buf);
return NULL;
}
if (point == NULL) {
if ((ret = EC_POINT_new(group)) == NULL) {
OPENSSL_free(buf);
return NULL;
}
} else
ret = point;
if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
if (ret != point)
EC_POINT_clear_free(ret);
OPENSSL_free(buf);
return NULL;
}
OPENSSL_free(buf);
return ret;
}
static const char *HEX_DIGITS = "0123456789ABCDEF";
/* the return value must be freed (using OPENSSL_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 = NULL, *pbuf;
buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
if (buf_len == 0)
return NULL;
ret = OPENSSL_malloc(buf_len * 2 + 2);
if (ret == NULL) {
OPENSSL_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';
OPENSSL_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))
return NULL;
ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
BN_clear_free(tmp_bn);
return ret;
}
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