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/*
* Copyright (C) 2016 Andreas Steffen
* HSR Hochschule fuer Technik Rapperswil
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
n */
/**
* @defgroup sha3_keccak sha3_keccak
* @{ @ingroup sha3_p
*/
#ifndef SHA3_KECCAK_H_
#define SHA3_KECCAK_H_
typedef struct sha3_keccak_t sha3_keccak_t;
#include <crypto/hashers/hasher.h>
/**
* Implements the Keccak-f[1600] sponge function as defined by FIPS-202.
*/
struct sha3_keccak_t {
/**
* Get the available rate in bytes
*
* @return rate in bytes
*/
u_int (*get_rate)(sha3_keccak_t *this);
/**
* Resets the internal Keccak state
*/
void (*reset)(sha3_keccak_t *this);
/**
* Absorbs data into the Keccak state
*
* @param data data to be absorbed
*/
void (*absorb)(sha3_keccak_t *this, chunk_t data);
/**
* Finalize the absorption phase and switch to the squeeze phase
*/
void (*finalize)(sha3_keccak_t *this);
/**
* Squeeze the Keccak state to get output data
* Can be called multiple times
*
* @param out_len number of output bytes requested
* @param out output buffer, must comprise at least out_len bytes
*/
void (*squeeze)(sha3_keccak_t *this, size_t out_len, uint8_t *out);
/**
* Destroy the sha3_keccak_t object
*/
void (*destroy)(sha3_keccak_t *this);
};
/**
* Creates a new sha3_keccak_t.
*
* @param capacity required capacity to achieve a given security level
* @param delimited_suffix bits delimiting the input message
* @return sha3_keccak_t object, NULL if capacity too big
*/
sha3_keccak_t *sha3_keccak_create(u_int capacity, uint8_t delimited_suffix);
#endif /** SHA3_KECCAK_H_ @}*/
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