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*/

#ifndef SHA3_H
#define SHA3_H

#include <stdint.h>
#include "options.h"

#ifdef __cplusplus
extern "C" {
#endif

#define sha3_224_hash_size 28
#define sha3_256_hash_size 32
#define sha3_384_hash_size 48
#define sha3_512_hash_size 64
#define sha3_max_permutation_size 25
#define sha3_max_rate_in_qwords 24

/**

• SHA3 Algorithm context.
  /
  typedef struct SHA3_CTX
  {
  / 1600 bits algorithm hashing state /
  uint64_t hash[sha3_max_permutation_size];
  / 1536-bit buffer for leftovers /
  uint64_t message[sha3_max_rate_in_qwords];
  / count of bytes in the message[] buffer /
  unsigned rest;
  / size of a message block processed at once */
  unsigned block_size;
  } SHA3_CTX;

/* methods for calculating the hash function */

void sha3_224_Init(SHA3_CTX *ctx);
void sha3_256_Init(SHA3_CTX *ctx);
void sha3_384_Init(SHA3_CTX *ctx);
void sha3_512_Init(SHA3_CTX *ctx);
void sha3_Update(SHA3_CTX ctx, const unsigned char msg, size_t size);
void sha3_Final(SHA3_CTX ctx, unsigned char result);

#if USE_KECCAK
#define keccak_224_Init sha3_224_Init
#define keccak_256_Init sha3_256_Init
#define keccak_384_Init sha3_384_Init
#define keccak_512_Init sha3_512_Init
#define keccak_Update sha3_Update
void keccak_Final(SHA3_CTX ctx, unsigned char result);
#endif

#ifdef __cplusplus
} /* extern "C" /
#endif / __cplusplus */

#endif /* SHA3_H */