mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
|
|
* 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;
|
|
}
|