确定散列算法 [英] Determine Hash Algorithm

问题描述

如果我有两个初始密钥和创建的哈希值，有没有办法来确定哈希算法？

If I have both the initial key and the hash that was created, is there any way to determine the hash algorithm?

例如：
重点：高
哈希：df072c8afcf2385b8d34aab3362020d0
算法=？

For example:
Key: higher
Hash: df072c8afcf2385b8d34aab3362020d0
Algorithm = ?

推荐答案

好了，因为有流行的散列算法是有限的，也许你提出什么不是太荒谬了。

Well, given that there are a finite number of popular hash algorithms, maybe what you propose is not so ridiculous.

但是假设我问你：

如果我有一个输入和输出，可   我确定函数？

If I have an input and an output, can I determine the function?

一般来说的不，你不能简单地从知道一个输入和一个输出，没有任何额外的信息来确定内部工作的任何功能。

Generally speaking, no, you cannot determine the inner-workings of any function simply from knowing one input and one output, without any additional information.

// very, very basic illustration
if (unknownFunction(2) == 4) {
    // what does unknownFunction do?
    // return x + 2?
    // or return x * 2?
    // or return Math.Pow(x, 2)?
    // or return Math.Pow(x, 3) - 4?
    // etc.
}

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