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/*
* Copyright 2019-2021 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
*/
/* This header can move into provider when legacy support is removed */
#ifndef OSSL_INTERNAL_SHA3_H
# define OSSL_INTERNAL_SHA3_H
# pragma once
# 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 ossl_sha3_reset(KECCAK1600_CTX *ctx);
int ossl_sha3_init(KECCAK1600_CTX *ctx, unsigned char pad, size_t bitlen);
int ossl_keccak_kmac_init(KECCAK1600_CTX *ctx, unsigned char pad,
size_t bitlen);
int ossl_sha3_update(KECCAK1600_CTX *ctx, const void *_inp, size_t len);
int ossl_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 */
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