問(wèn)題描述
MessageDigest.getInstance("SHA") 似乎工作并給了我一個(gè) 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(duì)我的機(jī)器上發(fā)生的事情不感興趣.我想知道它是否會(huì)為所有有效的 Java 實(shí)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(shí)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(huì)返回什么，如果有的話，因?yàn)樗辉跇?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.
這篇關(guān)于MessageDigest.getInstance(“SHA") 返回什么特定的哈希算法?的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！