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/**
* libkeccak – Keccak-family hashing library
*
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LIBKECCAK_DIGEST_H
#define LIBKECCAK_DIGEST_H 1
#include "state.h"
/**
* Absorb more of the message to the Keccak sponge
*
* @param state The hashing state
* @param msg The partial message
* @param msglen The length of the partial message
* @return Zero on success, -1 on error
*/
__attribute__((nonnull))
int libkeccak_update(libkeccak_state_t* restrict state, const char* restrict msg, size_t msglen);
/**
* Absorb the last part of the message and squeeze the Keccak sponge
*
* @param state The hashing state
* @param msg The rest of the message, may be `NULL`
* @param msglen The length of the partial message
* @param bits The number of bits at the end of the message not covered by `msglen`
* @param suffix The suffix concatenate to the message, only '1':s and '0':s, and NUL-termination
* @param hashsum Output paramter for the hashsum, may be `NULL`
* @return Zero on success, -1 on error
*/
__attribute__((nonnull(1)))
int libkeccak_digest(libkeccak_state_t* restrict state, const char* restrict msg, size_t msglen,
size_t bits, const char* restrict suffix, char* restrict hashsum);
/**
* Force some rounds of Keccak-f
*
* @param state The hashing state
* @param times The number of rounds
*/
inline __attribute__((nonnull, nothrow, artificial, gnu_inline))
void libkeccak_simple_squeeze(libkeccak_state_t* restrict state, long times);
/**
* Squeeze as much as is needed to get a digest a number of times
*
* @param state The hashing state
* @param times The number of digests
*/
inline __attribute__((nonnull, nothrow, artificial, gnu_inline))
void libkeccak_fast_squeeze(libkeccak_state_t* restrict state, long times);
/**
* Squeeze out another digest
*
* @param state The hashing state
* @param hashsum Output paramter for the hashsum
*/
__attribute__((nonnull, nothrow))
void libkeccak_squeeze(libkeccak_state_t* restrict state, char* restrict hashsum);
#undef
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