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/*
* Keccak implementation.
*
* Copyright (c) 2012 Marko Kreen
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/** @file
* Simple API to Keccak1600 permutation + sponge.
*/
#ifndef _USUAL_CRYPTO_KECCAK_H_
#define _USUAL_CRYPTO_KECCAK_H_
#include <usual/base.h>
/**
* Keccak state structure for all modes.
*/
struct KeccakContext {
/* 5*5*64 bit state */
union {
uint64_t state64[25];
uint32_t state32[2*25];
} u;
uint32_t pos; /* current byte position in buffer */
uint32_t rbytes; /* rate (= block size) in bytes */
};
/**
* Set up state with specified capacity.
*
* Returns 1 if successful, 0 if invalid capacity.
*/
int keccak_init(struct KeccakContext *ctx, unsigned int capacity);
/**
* Hash additional data.
*/
void keccak_absorb(struct KeccakContext *ctx, const void *data, size_t len);
/**
* Extract bytes from state.
*/
void keccak_squeeze(struct KeccakContext *ctx, uint8_t *dst, size_t len);
/**
* Extract bytes from state, XOR into data.
*/
void keccak_squeeze_xor(struct KeccakContext *ctx, uint8_t *dst, const void *src, size_t len);
/**
* XOR data into state and return it.
*/
void keccak_encrypt(struct KeccakContext *ctx, uint8_t *dst, const void *src, size_t len);
/**
* XOR state with data and return it.
*/
void keccak_decrypt(struct KeccakContext *ctx, uint8_t *dst, const void *src, size_t len);
/**
* Hash pad suffix.
*/
void keccak_pad(struct KeccakContext *ctx, const void *data, size_t len);
/**
* Move internal position to start of buffer.
*
* Useful for PRNG/duplex modes.
*/
void keccak_rewind(struct KeccakContext *ctx);
/**
* Clear rate bits.
*/
void keccak_forget(struct KeccakContext *ctx);
#endif
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