/*
 * FIPS 180-2 SHA-224/256/384/512 implementation
 * Last update: 02/02/2007
 * Issue date:  04/30/2005
 *
 * Copyright (C) 2022, The Radiant Blockchain Developers <radiantblockchain@protonmail.com>
 * Copyright (C) 2013, Con Kolivas <kernel@kolivas.org>
 * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
 * All rights reserved.
 *
 * 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.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
 */

#include <stdint.h>

#ifndef SHA2_H
#define SHA2_H

#define SHA512_BLOCK_SIZE  (1024 / 8)

#define SHFR(x, n)    (x >> n)
#define ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
#define CH(x, y, z)  ((x & y) ^ (~x & z))
#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))

//#ifndef SHA2_TYPES
//#define SHA2_TYPES
//typedef unsigned char uint8_t;
//typedef unsigned int  uint32_t;
//typedef unsigned long long uint64_t;
//#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    unsigned int tot_len;
    unsigned int len;
    unsigned char block[2 * SHA512_BLOCK_SIZE];
    uint64_t h[8];
} sha512_ctx;

typedef sha512_ctx sha512_256_ctx;

void sha512_256_init(sha512_ctx *ctx);
void sha512_256_update(sha512_ctx *ctx, const unsigned char *message,
                   unsigned int len);
void sha512_256_final(sha512_ctx *ctx, unsigned char *digest);
void sha512_256(const unsigned char *message, unsigned int len,
            unsigned char *digest);

void sha512_256_hash(const char* input, char* output, uint32_t len);
void sha512_256_double_hash(const char* input, char* output, uint32_t len);

#ifdef __cplusplus
}
#endif

#endif /* !SHA2_H */