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/*
* Copyright (c) 2017, [Ribose Inc](https://www.ribose.com).
* All rights reserved.
*
* This code is originally derived from software contributed to
* The NetBSD Foundation by Alistair Crooks (agc@netbsd.org), and
* carried further by Ribose Inc (https://www.ribose.com).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RNP_S2K_H_
#define RNP_S2K_H_
#include <cstdint>
#include "repgp/repgp_def.h"
typedef struct pgp_s2k_t pgp_s2k_t;
int pgp_s2k_iterated(pgp_hash_alg_t alg,
uint8_t * out,
size_t output_len,
const char * password,
const uint8_t *salt,
size_t iterations);
size_t pgp_s2k_decode_iterations(uint8_t encoded_iter);
uint8_t pgp_s2k_encode_iterations(size_t iterations);
// Round iterations to nearest representable value
size_t pgp_s2k_round_iterations(size_t iterations);
size_t pgp_s2k_compute_iters(pgp_hash_alg_t alg, size_t desired_msec, size_t trial_msec);
/** @brief Derive key from password using the information stored in s2k structure
* @param s2k pointer to s2k structure, filled according to RFC 4880.
* Iterations field may contain encoded ( < 256) or decoded ( > 256) value.
* @param password NULL-terminated password
* @param key buffer to store the derived key, must have at least keysize bytes
* @param keysize number of bytes in the key.
* @return true on success or false otherwise
*/
bool pgp_s2k_derive_key(pgp_s2k_t *s2k, const char *password, uint8_t *key, int keysize);
#endif
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