// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////

import com.code_intelligence.jazzer.api.FuzzedDataProvider;
import com.code_intelligence.jazzer.api.FuzzerSecurityIssueHigh;
import org.springframework.security.crypto.bcrypt.BCrypt;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

public class BCryptPasswordEncoderFuzzer {
    public static void fuzzerTestOneInput(FuzzedDataProvider data) {
        BCryptPasswordEncoder.BCryptVersion bCryptVersion = data.pickValue(new BCryptPasswordEncoder.BCryptVersion[]
                {BCryptPasswordEncoder.BCryptVersion.$2A, BCryptPasswordEncoder.BCryptVersion.$2B, BCryptPasswordEncoder.BCryptVersion.$2Y});

        BCryptPasswordEncoder encoder;
        try {
            if (data.consumeBoolean()) {
                encoder = new BCryptPasswordEncoder(bCryptVersion);
            } else {
                // using MAX_LOG_ROUNDS will slow down the fuzz test
                encoder = new BCryptPasswordEncoder(bCryptVersion, data.consumeInt(-1, 10));
            }
        } catch (IllegalArgumentException ignored) {
            return;
        }

        String password = data.consumeRemainingAsString();
        if (password.isEmpty()) {
            return;
        }

        String result = encoder.encode(password);
        if (!encoder.matches(password, result)) {
            throw new FuzzerSecurityIssueHigh("Password `" + password + "` does not match encoded one `" + result + "`");
        }
    }
}