ExampleFuzzerHooks.java

// Copyright 2021 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 com.code_intelligence.jazzer.api.HookType;
import com.code_intelligence.jazzer.api.MethodHook;
import java.lang.invoke.MethodHandle;

public class ExampleFuzzerHooks {
  @MethodHook(
      type = HookType.REPLACE,
      targetClassName = "java.security.SecureRandom",
      targetMethod = "nextLong",
      targetMethodDescriptor = "()J")
  public static long getRandomNumber(
      MethodHandle handle, Object thisObject, Object[] args, int hookId) {
    return 4; // chosen by fair dice roll.
    // guaranteed to be random.
    // https://xkcd.com/221/
  }
}