从 SecureRandom 获取确定性值? [英] Get deterministic values from SecureRandom?

问题描述

出于基准测试目的，我希望 SecureRandom 产生确定性输出.这是否可以通过使用种子(或算法规范)来实现?

For benchmarking purposes, I'd like to have a SecureRandom produce deterministic output. Is this possible through the use of a seed (or maybe specification of an algorithm)?

import java.security.SecureRandom;
class TestSecureRandom {
    public static void main(String [] args) {
        SecureRandom rnd = new SecureRandom();
        rnd.setSeed(1);
        System.out.println(rnd.nextInt());
    }
}

对我来说，即使指定了种子，上述程序也会产生不同的值.

For me, the above program produces different values even though the seed is specified.

推荐答案

最简单的方法可能是让你的大部分代码只依赖于 Random，并注入一个实例(例如通过将其传递给构造函数).这样，出于测试目的，您可以传入一个带有固定种子的简单 Random - 但对于需要安全性的 real 运行，您可以传入一个 实例>SecureRandom.

The simplest way of doing this is probably to make most of your code only depend on Random, with an instance being injected (e.g. by passing it into a constructor). That way, for testing purposes you can pass in a simple Random with a fixed seed - but for real runs where security is required, you can pass in an instance of SecureRandom.

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