MessageDigest.getInstance（“SHA”）返回什么特定的哈希算法？ [英] What specific hash algorithm does MessageDigest.getInstance("SHA") return?

问题描述

MessageDigest.getInstance（SHA）似乎工作，并给我一个 MessageDigest

MessageDigest.getInstance("SHA") seems to work and gives me a MessageDigest, but I can't tell what algorithm it's giving me.

是SHA-1还是SHA-0或..？

Is it SHA-1 or SHA-0 or ..?

我对我的机器上发生的事情不感兴趣。我想知道它是否会返回sha0或sha1的所有有效的Java实现（或它的未定义）。

I'm not interested in what happens on my machine. I want to know whether it will return sha0 or sha1 for all valid implementations of Java (or it's undefined).

推荐答案

a href =http://docs.oracle.com/javase/1.5.0/docs/guide/security/CryptoSpec.html#AppA> JCE规范列出了实施预期支持的标准名称。指定了SHA-1，SHA-256，SHA-384和SHA-512也被指定。 SHA，SHA-0和SHA-2不是标准名称，因此可能不被支持。你不能保证什么SHA将返回，如果有什么，因为它不在标准。

The JCE Specification lists standard names that an implementation is expected to support. "SHA-1" is specified, as are SHA-256, SHA-384, and SHA-512. "SHA", "SHA-0" and SHA-2" are not standard names and therefore may not be supported at all. You cannot guarantee what "SHA" will return, if anything at all, because it is not in the standard.

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