e206. listing all available message digest algorithms.txt

这里面包含了一百多个JAVA源文件

Retrieving the list of available message digest algorithms requires checking the services provided by all registered providers. The retrieved list of names can be used in creating a MessageDigest object. 
    // This method is implemented in e194 Listing All Available Cryptographic Services
    String[] names = getCryptoImpls("MessageDigest");

An example of the output: 
    MD5
    SHA
    SHA1
    SHA-1