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.digests;


 Encodable digests allow you to download an encoded copy of their internal state. This is useful for the situation where
 you need to generate a signature on an external device and it allows for "sign with last round", so a copy of the
 internal state of the digest, plus the last few blocks of the message are all that needs to be sent, rather than the
 entire message.

/**
 *  Encodable digests allow you to download an encoded copy of their internal state. This is useful for the situation where
 *  you need to generate a signature on an external device and it allows for "sign with last round", so a copy of the
 *  internal state of the digest, plus the last few blocks of the message are all that needs to be sent, rather than the
 *  entire message.
 */
public interface EncodableDigest
{
    
Return an encoded byte array for the digest's internal state

Returns:an encoding of the digests internal state.
/**
     * Return an encoded byte array for the digest's internal state
     *
     * @return an encoding of the digests internal state.
     */
    byte[] getEncodedState();
}