bitcoin core ipc fuzz coverage

// Copyright (c) 2022-present 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 <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

#include <test/util/setup_common.h>

#include <wallet/crypter.h>

namespace wallet {

namespace {

void initialize_crypter()

{

    static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();

}

FUZZ_TARGET(crypter, .init = initialize_crypter)

{

    SeedRandomStateForTest(SeedRand::ZEROS);

    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());

    bool good_data{true};

    CCrypter crypt;

    // These values are regularly updated within `CallOneOf`

    std::vector<unsigned char> cipher_text_ed;

    CKeyingMaterial plain_text_ed;

    const std::vector<unsigned char> random_key = ConsumeFixedLengthByteVector(fuzzed_data_provider, WALLET_CRYPTO_KEY_SIZE);

    if (fuzzed_data_provider.ConsumeBool()) {

        const std::string random_string = fuzzed_data_provider.ConsumeRandomLengthString(100);

        SecureString secure_string(random_string.begin(), random_string.end());

        const unsigned int derivation_method = fuzzed_data_provider.ConsumeBool() ? 0 : fuzzed_data_provider.ConsumeIntegral<unsigned int>();

        // Limiting the value of rounds since it is otherwise uselessly expensive and causes a timeout when fuzzing.

        crypt.SetKeyFromPassphrase(/*key_data=*/secure_string,

                                   /*salt=*/ConsumeFixedLengthByteVector(fuzzed_data_provider, WALLET_CRYPTO_SALT_SIZE),

                                   /*rounds=*/fuzzed_data_provider.ConsumeIntegralInRange<unsigned int>(0, CMasterKey::DEFAULT_DERIVE_ITERATIONS),

                                   /*derivation_method=*/derivation_method);

    }

    CKey random_ckey;

    random_ckey.Set(random_key.begin(), random_key.end(), /*fCompressedIn=*/fuzzed_data_provider.ConsumeBool());

    if (!random_ckey.IsValid()) return;

    CPubKey pubkey{random_ckey.GetPubKey()};

    LIMITED_WHILE (good_data && fuzzed_data_provider.ConsumeBool(), 100) {

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    for (unsigned _count{limit}; (condition) && _count; --_count)

        CallOneOf(

            fuzzed_data_provider,

            [&] {

                const std::vector<unsigned char> random_vector = ConsumeFixedLengthByteVector(fuzzed_data_provider, WALLET_CRYPTO_KEY_SIZE);

                plain_text_ed = CKeyingMaterial(random_vector.begin(), random_vector.end());

            },

            [&] {

                cipher_text_ed = ConsumeRandomLengthByteVector(fuzzed_data_provider, 64);

            },

            [&] {

                (void)crypt.Encrypt(plain_text_ed, cipher_text_ed);

            },

            [&] {

                (void)crypt.Decrypt(cipher_text_ed, plain_text_ed);

            },

            [&] {

                const CKeyingMaterial master_key(random_key.begin(), random_key.end());

                (void)EncryptSecret(master_key, plain_text_ed, pubkey.GetHash(), cipher_text_ed);

            },

            [&] {

                std::optional<CPubKey> random_pub_key{ConsumeDeserializable<CPubKey>(fuzzed_data_provider)};

                if (!random_pub_key) {

                    good_data = false;

                    return;

                }

                pubkey = *random_pub_key;

            },

            [&] {

                const CKeyingMaterial master_key(random_key.begin(), random_key.end());

                CKey key;

                (void)DecryptKey(master_key, cipher_text_ed, pubkey, key);

            });

    }

}

} // namespace

} // namespace wallet