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      1 /*
      2  * Copyright 2019-2021 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 /* This header can move into provider when legacy support is removed */
     11 #ifndef OSSL_INTERNAL_SHA3_H
     12 # define OSSL_INTERNAL_SHA3_H
     13 # pragma once
     14 
     15 # include <openssl/e_os2.h>
     16 # include <stddef.h>
     17 
     18 # define KECCAK1600_WIDTH 1600
     19 # define SHA3_MDSIZE(bitlen)    (bitlen / 8)
     20 # define KMAC_MDSIZE(bitlen)    2 * (bitlen / 8)
     21 # define SHA3_BLOCKSIZE(bitlen) (KECCAK1600_WIDTH - bitlen * 2) / 8
     22 
     23 typedef struct keccak_st KECCAK1600_CTX;
     24 
     25 typedef size_t (sha3_absorb_fn)(void *vctx, const void *inp, size_t len);
     26 typedef int (sha3_final_fn)(unsigned char *md, void *vctx);
     27 
     28 typedef struct prov_sha3_meth_st
     29 {
     30     sha3_absorb_fn *absorb;
     31     sha3_final_fn *final;
     32 } PROV_SHA3_METHOD;
     33 
     34 struct keccak_st {
     35     uint64_t A[5][5];
     36     size_t block_size;          /* cached ctx->digest->block_size */
     37     size_t md_size;             /* output length, variable in XOF */
     38     size_t bufsz;               /* used bytes in below buffer */
     39     unsigned char buf[KECCAK1600_WIDTH / 8 - 32];
     40     unsigned char pad;
     41     PROV_SHA3_METHOD meth;
     42 };
     43 
     44 void ossl_sha3_reset(KECCAK1600_CTX *ctx);
     45 int ossl_sha3_init(KECCAK1600_CTX *ctx, unsigned char pad, size_t bitlen);
     46 int ossl_keccak_kmac_init(KECCAK1600_CTX *ctx, unsigned char pad,
     47                           size_t bitlen);
     48 int ossl_sha3_update(KECCAK1600_CTX *ctx, const void *_inp, size_t len);
     49 int ossl_sha3_final(unsigned char *md, KECCAK1600_CTX *ctx);
     50 
     51 size_t SHA3_absorb(uint64_t A[5][5], const unsigned char *inp, size_t len,
     52                    size_t r);
     53 
     54 #endif /* OSSL_INTERNAL_SHA3_H */
     55