2 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/crypto.h>
11 #include <openssl/err.h>
14 BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
15 const EC_POINT *point,
16 point_conversion_form_t form,
17 BIGNUM *ret, BN_CTX *ctx)
22 buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
27 ret = BN_bin2bn(buf, buf_len, ret);
34 EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
35 const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
41 if ((buf_len = BN_num_bytes(bn)) == 0)
43 if ((buf = OPENSSL_malloc(buf_len)) == NULL) {
44 ECerr(EC_F_EC_POINT_BN2POINT, ERR_R_MALLOC_FAILURE);
48 if (!BN_bn2bin(bn, buf)) {
54 if ((ret = EC_POINT_new(group)) == NULL) {
61 if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
63 EC_POINT_clear_free(ret);
72 static const char *HEX_DIGITS = "0123456789ABCDEF";
74 /* the return value must be freed (using OPENSSL_free()) */
75 char *EC_POINT_point2hex(const EC_GROUP *group,
76 const EC_POINT *point,
77 point_conversion_form_t form, BN_CTX *ctx)
80 size_t buf_len = 0, i;
81 unsigned char *buf = NULL, *pbuf;
83 buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
88 ret = OPENSSL_malloc(buf_len * 2 + 2);
95 for (i = buf_len; i > 0; i--) {
96 int v = (int)*(pbuf++);
97 *(p++) = HEX_DIGITS[v >> 4];
98 *(p++) = HEX_DIGITS[v & 0x0F];
107 EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
108 const char *buf, EC_POINT *point, BN_CTX *ctx)
110 EC_POINT *ret = NULL;
111 BIGNUM *tmp_bn = NULL;
113 if (!BN_hex2bn(&tmp_bn, buf))
116 ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
118 BN_clear_free(tmp_bn);