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/*
* Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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 <string.h> /* strlen */
#include <openssl/crypto.h>
#include "ec_local.h"
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 *hex, EC_POINT *point, BN_CTX *ctx)
{
int ok = 0;
unsigned char *oct_buf = NULL;
size_t len, oct_buf_len = 0;
EC_POINT *pt = NULL;
if (group == NULL || hex == NULL)
return NULL;
if (point == NULL) {
pt = EC_POINT_new(group);
if (pt == NULL)
goto err;
} else {
pt = point;
}
len = strlen(hex) / 2;
oct_buf = OPENSSL_malloc(len);
if (oct_buf == NULL)
goto err;
if (!OPENSSL_hexstr2buf_ex(oct_buf, len, &oct_buf_len, hex, '\0')
|| !EC_POINT_oct2point(group, pt, oct_buf, oct_buf_len, ctx))
goto err;
ok = 1;
err:
OPENSSL_clear_free(oct_buf, oct_buf_len);
if (!ok) {
if (pt != point)
EC_POINT_clear_free(pt);
pt = NULL;
}
return pt;
}
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