e467. listing all available message authentication code (mac) key generators.txt

这里面包含了一百多个JAVA源文件

Retrieving the list of available MAC algorithms requires checking the services provided by all registered providers. 
    // This method is implemented in e194 Listing All Available Cryptographic Services
    String[] names = getCryptoImpls("Mac");

An example of the output: 
    HmacSHA1
    HmacMD5