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/* Copyright (c) 2023, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#ifndef OPENSSL_HEADER_CRYPTO_KECCAK_INTERNAL_H
#define OPENSSL_HEADER_CRYPTO_KECCAK_INTERNAL_H
#include <openssl/base.h>
#if defined(__cplusplus)
extern "C" {
#endif
enum boringssl_keccak_config_t {
boringssl_sha3_256,
boringssl_sha3_512,
boringssl_shake128,
boringssl_shake256,
};
enum boringssl_keccak_phase_t {
boringssl_keccak_phase_absorb,
boringssl_keccak_phase_squeeze,
};
struct BORINGSSL_keccak_st {
enum boringssl_keccak_config_t config;
enum boringssl_keccak_phase_t phase;
uint64_t state[25];
size_t rate_bytes;
size_t absorb_offset;
size_t squeeze_offset;
};
// BORINGSSL_keccak hashes |in_len| bytes from |in| and writes |out_len| bytes
// of output to |out|. If the |config| specifies a fixed-output function, like
// SHA3-256, then |out_len| must be the correct length for that function.
OPENSSL_EXPORT void BORINGSSL_keccak(uint8_t *out, size_t out_len,
const uint8_t *in, size_t in_len,
enum boringssl_keccak_config_t config);
// BORINGSSL_keccak_init prepares |ctx| for absorbing. The |config| must specify
// a SHAKE variant, otherwise callers should use |BORINGSSL_keccak|.
OPENSSL_EXPORT void BORINGSSL_keccak_init(
struct BORINGSSL_keccak_st *ctx, enum boringssl_keccak_config_t config);
// BORINGSSL_keccak_absorb absorbs |in_len| bytes from |in|.
OPENSSL_EXPORT void BORINGSSL_keccak_absorb(struct BORINGSSL_keccak_st *ctx,
const uint8_t *in, size_t in_len);
// BORINGSSL_keccak_squeeze writes |out_len| bytes to |out| from |ctx|.
OPENSSL_EXPORT void BORINGSSL_keccak_squeeze(struct BORINGSSL_keccak_st *ctx,
uint8_t *out, size_t out_len);
#if defined(__cplusplus)
}
#endif
#endif // OPENSSL_HEADER_CRYPTO_KECCAK_INTERNAL_H