/*

 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/* TODO(3.0) Move this header into provider when dependencies are removed */

#ifndef OSSL_INTERNAL_SHA3_H

# define OSSL_INTERNAL_SHA3_H

# include <openssl/e_os2.h>

# include <stddef.h>

# define KECCAK1600_WIDTH 1600

# define SHA3_MDSIZE(bitlen)    (bitlen / 8)

# define KMAC_MDSIZE(bitlen)    2 * (bitlen / 8)

# define SHA3_BLOCKSIZE(bitlen) (KECCAK1600_WIDTH - bitlen * 2) / 8

typedef struct keccak_st KECCAK1600_CTX;

typedef size_t (sha3_absorb_fn)(void *vctx, const void *inp, size_t len);

typedef int (sha3_final_fn)(unsigned char *md, void *vctx);

typedef struct prov_sha3_meth_st

{

    sha3_absorb_fn *absorb;

    sha3_final_fn *final;

} PROV_SHA3_METHOD;

struct keccak_st {

    uint64_t A[5][5];

    size_t block_size;          /* cached ctx->digest->block_size */

    size_t md_size;             /* output length, variable in XOF */

    size_t bufsz;               /* used bytes in below buffer */

    unsigned char buf[KECCAK1600_WIDTH / 8 - 32];

    unsigned char pad;

    PROV_SHA3_METHOD meth;

};

void sha3_reset(KECCAK1600_CTX *ctx);

int sha3_init(KECCAK1600_CTX *ctx, unsigned char pad, size_t bitlen);

int keccak_kmac_init(KECCAK1600_CTX *ctx, unsigned char pad, size_t bitlen);

int sha3_update(KECCAK1600_CTX *ctx, const void *_inp, size_t len);

int sha3_final(unsigned char *md, KECCAK1600_CTX *ctx);

size_t SHA3_absorb(uint64_t A[5][5], const unsigned char *inp, size_t len,

                   size_t r);

#endif /* OSSL_INTERNAL_SHA3_H */