問題描述
MessageDigest.getInstance("SHA") 似乎工作并給了我一個 MessageDigest，但我不知道它給了我什么算法.
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 還是 SHA-0 還是 ..?
Is it SHA-1 or SHA-0 or ..?
我對我的機(jī)器上發(fā)生的事情不感興趣.我想知道它是否會為所有有效的 Java 實現(xiàn)返回 sha0 或 sha1(或者它是未定義的).
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).
推薦答案
JCE 規(guī)范 列出了實現(xiàn)應(yīng)該支持的標(biāo)準(zhǔn)名稱.指定了SHA-1"，以及 SHA-256、SHA-384 和 SHA-512.SHA"、SHA-0"和SHA-2"不是標(biāo)準(zhǔn)名稱，因此可能根本不受支持.您不能保證SHA"會返回什么，如果有的話，因為它不在標(biāo)準(zhǔn)中.
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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