http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.crypto;

public interface ExtendedDigest 
    extends Digest
{
    
Return the size in bytes of the internal buffer the digest applies it's compression
function to.

Returns:byte length of the digests internal buffer.
/**
     * Return the size in bytes of the internal buffer the digest applies it's compression
     * function to.
     * 
     * @return byte length of the digests internal buffer.
     */
    public int getByteLength();
}