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/*
* Copyright 2023 Code Intelligence GmbH
*
* 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.
*/
package com.example;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assumptions.assumeTrue;
import com.code_intelligence.jazzer.junit.FuzzTest;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import org.junit.jupiter.params.converter.ArgumentConversionException;
import org.junit.jupiter.params.converter.ConvertWith;
import org.junit.jupiter.params.converter.SimpleArgumentConverter;
import org.junit.jupiter.params.provider.ValueSource;
class JavaBinarySeedFuzzTest {
// Generated via:
// printf 'tH15_1S-4_53Cr3T.fl4G' | openssl dgst -binary -sha256 | openssl base64 -A
// Luckily the fuzzer can't read comments ;-)
private static final byte[] FLAG_SHA256 =
Base64.getDecoder().decode("q0vPdz5oeJIW3k2U4VJ+aWDufzzZbKAcevc9cNoUTSM=");
static class Utf8BytesConverter extends SimpleArgumentConverter {
@Override
protected Object convert(Object source, Class<?> targetType)
throws ArgumentConversionException {
assertEquals(byte[].class, targetType);
assertTrue(source instanceof byte[] || source instanceof String);
if (source instanceof byte[]) {
return source;
}
return ((String) source).getBytes(UTF_8);
}
}
@ValueSource(strings = {"red herring", "tH15_1S-4_53Cr3T.fl4Ga"})
@FuzzTest
void fuzzTheFlag(@ConvertWith(Utf8BytesConverter.class) byte[] bytes)
throws NoSuchAlgorithmException {
assumeTrue(bytes.length > 0);
MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.update(bytes, 0, bytes.length - 1);
byte[] hash = digest.digest();
byte secret = bytes[bytes.length - 1];
if (MessageDigest.isEqual(hash, FLAG_SHA256) && secret == 's') {
throw new Error("Fl4g 4nd s3cr3et f0und!");
}
}
}
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