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/* Copyright (C) 2016-2017 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 "lib/defines.h"
/* RFC7873 Appendix B.2 mentions an algorithm using two values before the
* actual server cookie hash. */
/** Nonce value length. */
#define KR_NONCE_LEN 8
/** Input data to generate nonce from. */
struct kr_nonce_input {
uint32_t rand; /**< some random value */
uint32_t time; /**< time stamp */
};
/**
* @brief Writes server cookie nonce value into given buffer.
*
* @param buf buffer to write nonce data in wire format into
* @param buf_len buffer size
* @param input data to generate wire data from
* @return non-zero size of written data on success, 0 on failure
*/
KR_EXPORT
uint16_t kr_nonce_write_wire(uint8_t *buf, uint16_t buf_len,
const struct kr_nonce_input *input);
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