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/* 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 <https://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);
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