WARNING - DEPRECATED - Use SHA256Generator.getDigestInstance() to get a MessageDigest that will be faster in almost all cases.

This is the old GNU SHA-256 Hash implementation. It is deprecated and mostly unused, unless the java.security.MessageDigest implementation for SHA-256 is not available in the JVM. And it always should be, right? Do not instantiate this directly - use I2PAppContext.sha(). See net.i2p.crypto.SHA256Generator for more information and test results.