31 lines
881 B
C
31 lines
881 B
C
/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#pragma once
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#include "lib/defines.h"
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/* RFC7873 Appendix B.2 mentions an algorithm using two values before the
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* actual server cookie hash. */
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/** Nonce value length. */
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#define KR_NONCE_LEN 8
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/** Input data to generate nonce from. */
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struct kr_nonce_input {
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uint32_t rand; /**< some random value */
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uint32_t time; /**< time stamp */
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};
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/**
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* @brief Writes server cookie nonce value into given buffer.
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*
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* @param buf buffer to write nonce data in wire format into
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* @param buf_len buffer size
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* @param input data to generate wire data from
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* @return non-zero size of written data on success, 0 on failure
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*/
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KR_EXPORT
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uint16_t kr_nonce_write_wire(uint8_t *buf, uint16_t buf_len,
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const struct kr_nonce_input *input);
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