/**
 * Copyright (c) 2017 Saleem Rashid
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef __HASHER_H__
#define __HASHER_H__

#include <stddef.h>
#include <stdint.h>

#include "sha2.h"
#include "blake256.h"
#include "groestl.h"
#include "blake2b.h"

#define HASHER_DIGEST_LENGTH 32

typedef enum {
    HASHER_SHA2,
    HASHER_BLAKE,

    HASHER_SHA2D,
    HASHER_BLAKED,

    HASHER_GROESTLD_TRUNC, /* Double Groestl512 hasher truncated to 256 bits */

    HASHER_OVERWINTER_PREVOUTS,
    HASHER_OVERWINTER_SEQUENCE,
    HASHER_OVERWINTER_OUTPUTS,
    HASHER_OVERWINTER_PREIMAGE,
} HasherType;

typedef struct {
    HasherType type;

    union {
        SHA256_CTX sha2;
        BLAKE256_CTX blake;
        GROESTL512_CTX groestl;
        BLAKE2B_CTX blake2b;
    } ctx;
} Hasher;

void hasher_Init(Hasher *hasher, HasherType type);
void hasher_Reset(Hasher *hasher);
void hasher_Update(Hasher *hasher, const uint8_t *data, size_t length);
void hasher_Final(Hasher *hasher, uint8_t hash[HASHER_DIGEST_LENGTH]);

void hasher_Raw(HasherType type, const uint8_t *data, size_t length, uint8_t hash[HASHER_DIGEST_LENGTH]);

#endif