mpc_hash.hpp

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// Copyright (c) 2015-2022 Clearmatics Technologies Ltd
//
// SPDX-License-Identifier: LGPL-3.0+
 
#ifndef __ZETH_MPC_GROTH16_MPC_HASH_HPP__
#define __ZETH_MPC_GROTH16_MPC_HASH_HPP__
 
#include "libzeth/core/hash_stream.hpp"
 
#include <sodium/crypto_generichash_blake2b.h>
#include <string>
 
namespace libzeth
{
 
// Hashing for MPC. Streaming and whole-buffer interfaces.
static const size_t MPC_HASH_SIZE_BYTES = 64;
static const size_t MPC_HASH_ARRAY_LENGTH =
    MPC_HASH_SIZE_BYTES / sizeof(size_t);
 
using mpc_hash_t = size_t[MPC_HASH_ARRAY_LENGTH];
using mpc_hash_state_t = crypto_generichash_blake2b_state;
 
void mpc_hash_init(mpc_hash_state_t &);
void mpc_hash_update(mpc_hash_state_t &, const void *, size_t);
void mpc_hash_final(mpc_hash_state_t &, mpc_hash_t);
void mpc_compute_hash(mpc_hash_t out_hash, const void *data, size_t data_size);
void mpc_compute_hash(mpc_hash_t out_hash, const std::string &data);
 
void mpc_hash_write(const mpc_hash_t hash, std::ostream &out);
 
bool mpc_hash_read(mpc_hash_t out_hash, std::istream &in);
 
class mpc_hash
{
private:
    mpc_hash_state_t state;
 
public:
    using OutBuffer = mpc_hash_t;
 
    mpc_hash();
    void update(const void *, size_t);
    void final(OutBuffer out_buffer);
};
 
using mpc_hash_ostream = hash_ostream<mpc_hash>;
using mpc_hash_ostream_wrapper = hash_ostream_wrapper<mpc_hash>;
using mpc_hash_istream_wrapper = hash_istream_wrapper<mpc_hash>;
 
} // namespace libzeth
 
#endif // __ZETH_MPC_GROTH16_MPC_HASH_HPP__