2 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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_bn2binpad(bn
, buf
, buf_len
)) {
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
);