让每一个算法消息摘要可以使用吗？ [英] Get every algorithm MessageDigest can use?

问题描述

消息摘要需要一个字符串，当你即将哈希使用哪种算法。 我用了一些code这里积聚我的Andr​​oid设备上的220算法，而大名单。用它们作为一种算法，消息摘要和极少数人我迭代通过所有这些实际产生的哈希值。

MessageDigest takes a string for what algorithm to use when you're about to hash. I've used some of the code here to accumulate a rather large list of 220 "algorithms" on my android device. I iterated through all of them using them as an algorithm in MessageDigest and very few of them actually produce a hash.

我怎样才能在运行时，确定散列消息摘要将产生一个输出，但不尝试每一个？

How can I, at runtime, determine what hashes MessageDigest will produce an output for without trying every one?

推荐答案

列出的服务，然后调用的getType（）方法。如果是消息摘要，那么这是一个散列算法。是这样的：

List the Services of each provider, then call the getType() method. If it is MessageDigest, then this is a hash algorithm. Something like:

Provider[] providers = Security.getProviders();
for (Provider p : providers) {
  String providerStr = String.format("%s/%s/%f\n", p.getName(),
                    p.getInfo(), p.getVersion());
  Set<Service> services = p.getServices();
  for (Service s : services) {
    if ("MessageDigest".equals(s.getType())) {
       System.out.printf("\t%s/%s/%s", s.getType(),
                            s.getAlgorithm(), s.getClassName());
    }
  }
}

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