1/*
2 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/* TODO(3.0) Move this header into provider when dependencies are removed */
11#ifndef OSSL_INTERNAL_SHA3_H
12# define OSSL_INTERNAL_SHA3_H
13
14# include <openssl/e_os2.h>
15# include <stddef.h>
16
17# define KECCAK1600_WIDTH 1600
18# define SHA3_MDSIZE(bitlen) (bitlen / 8)
19# define KMAC_MDSIZE(bitlen) 2 * (bitlen / 8)
20# define SHA3_BLOCKSIZE(bitlen) (KECCAK1600_WIDTH - bitlen * 2) / 8
21
22typedef struct keccak_st KECCAK1600_CTX;
23
24typedef size_t (sha3_absorb_fn)(void *vctx, const void *inp, size_t len);
25typedef int (sha3_final_fn)(unsigned char *md, void *vctx);
26
27typedef struct prov_sha3_meth_st
28{
29 sha3_absorb_fn *absorb;
30 sha3_final_fn *final;
31} PROV_SHA3_METHOD;
32
33struct keccak_st {
34 uint64_t A[5][5];
35 size_t block_size; /* cached ctx->digest->block_size */
36 size_t md_size; /* output length, variable in XOF */
37 size_t bufsz; /* used bytes in below buffer */
38 unsigned char buf[KECCAK1600_WIDTH / 8 - 32];
39 unsigned char pad;
40 PROV_SHA3_METHOD meth;
41};
42
43void sha3_reset(KECCAK1600_CTX *ctx);
44int sha3_init(KECCAK1600_CTX *ctx, unsigned char pad, size_t bitlen);
45int keccak_kmac_init(KECCAK1600_CTX *ctx, unsigned char pad, size_t bitlen);
46int sha3_update(KECCAK1600_CTX *ctx, const void *_inp, size_t len);
47int sha3_final(unsigned char *md, KECCAK1600_CTX *ctx);
48
49size_t SHA3_absorb(uint64_t A[5][5], const unsigned char *inp, size_t len,
50 size_t r);
51
52#endif /* OSSL_INTERNAL_SHA3_H */
53