1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "libdnssec/binary.h"
/*
* The ECDSA signatures in DNSSEC are encoded differently than in X.509
* (PKCS #1). The cryptographic libraries usually produce the signatures in
* X.509 format, which uses Dss-Sig-Value to encapsulate 'r' and 's' values
* of the signature.
*
* This module provides decoding and encoding of this format.
*
* The 'r' and 's' values are treated as unsigned values: The leading zeroes
* are stripped on decoding; an extra leading zero is added on encoding in case
* the value starts with a set bit.
*/
/*!
* Decode signature parameters from X.509 ECDSA signature.
*
* \param[in] der X.509 encoded signature.
* \param[out] s Value 's' of the signature, will point to the data in DER.
* \param[out] r Value 'r' of the signature, will point to the data in DER.
*
* \return Error code, DNSSEC_EOK if successful.
*/
int dss_sig_value_decode(const dnssec_binary_t *der,
dnssec_binary_t *r, dnssec_binary_t *s);
/*!
* Encode signature parameters from X.509 ECDSA signature.
*
* \param[in] s Value 's' of the signature.
* \param[in] r Value 'r' of the signature.
* \param[out] der X.509 signature, the content will be allocated.
*
* \return Error code, DNSSEC_EOK if successful.
*/
int dss_sig_value_encode(const dnssec_binary_t *r, const dnssec_binary_t *s,
dnssec_binary_t *der);
|
