// Copyright (c) 2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <crypto/hmac_sha256.h>
#include <crypto/hmac_sha512.h>
#include <crypto/ripemd160.h>
#include <crypto/sha1.h>
#include <crypto/sha256.h>
#include <crypto/sha512.h>
#include <hash.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>

#include <cstdint>
#include <vector>

void test_one_input(const std::vector<uint8_t>& buffer)
{
    FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
    std::vector<uint8_t> data = ConsumeRandomLengthByteVector(fuzzed_data_provider);
    if (data.empty()) {
        data.resize(fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 4096), fuzzed_data_provider.ConsumeIntegral<uint8_t>());
    }

    CHash160 hash160;
    CHash256 hash256;
    CHMAC_SHA256 hmac_sha256{data.data(), data.size()};
    CHMAC_SHA512 hmac_sha512{data.data(), data.size()};
    CRIPEMD160 ripemd160;
    CSHA1 sha1;
    CSHA256 sha256;
    CSHA512 sha512;
    CSipHasher sip_hasher{fuzzed_data_provider.ConsumeIntegral<uint64_t>(), fuzzed_data_provider.ConsumeIntegral<uint64_t>()};

    while (fuzzed_data_provider.ConsumeBool()) {
        switch (fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 2)) {
        case 0: {
            if (fuzzed_data_provider.ConsumeBool()) {
                data = ConsumeRandomLengthByteVector(fuzzed_data_provider);
                if (data.empty()) {
                    data.resize(fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 4096), fuzzed_data_provider.ConsumeIntegral<uint8_t>());
                }
            }

            (void)hash160.Write(data);
            (void)hash256.Write(data);
            (void)hmac_sha256.Write(data.data(), data.size());
            (void)hmac_sha512.Write(data.data(), data.size());
            (void)ripemd160.Write(data.data(), data.size());
            (void)sha1.Write(data.data(), data.size());
            (void)sha256.Write(data.data(), data.size());
            (void)sha512.Write(data.data(), data.size());
            (void)sip_hasher.Write(data.data(), data.size());

            (void)Hash(data.begin(), data.end());
            (void)Hash160(data);
            (void)Hash160(data.begin(), data.end());
            (void)sha512.Size();
            break;
        }
        case 1: {
            (void)hash160.Reset();
            (void)hash256.Reset();
            (void)ripemd160.Reset();
            (void)sha1.Reset();
            (void)sha256.Reset();
            (void)sha512.Reset();
            break;
        }
        case 2: {
            switch (fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 8)) {
            case 0: {
                data.resize(CHash160::OUTPUT_SIZE);
                hash160.Finalize(data);
                break;
            }
            case 1: {
                data.resize(CHash256::OUTPUT_SIZE);
                hash256.Finalize(data);
                break;
            }
            case 2: {
                data.resize(CHMAC_SHA256::OUTPUT_SIZE);
                hmac_sha256.Finalize(data.data());
                break;
            }
            case 3: {
                data.resize(CHMAC_SHA512::OUTPUT_SIZE);
                hmac_sha512.Finalize(data.data());
                break;
            }
            case 4: {
                data.resize(CRIPEMD160::OUTPUT_SIZE);
                ripemd160.Finalize(data.data());
                break;
            }
            case 5: {
                data.resize(CSHA1::OUTPUT_SIZE);
                sha1.Finalize(data.data());
                break;
            }
            case 6: {
                data.resize(CSHA256::OUTPUT_SIZE);
                sha256.Finalize(data.data());
                break;
            }
            case 7: {
                data.resize(CSHA512::OUTPUT_SIZE);
                sha512.Finalize(data.data());
                break;
            }
            case 8: {
                data.resize(1);
                data[0] = sip_hasher.Finalize() % 256;
                break;
            }
            }
            break;
        }
        }
    }
}