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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.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.
 */
public interface EncodableDigest
{
    /**
     * Return an encoded byte array for the digest's internal state
     *
     * @return an encoding of the digests internal state.
     */
    byte[] getEncodedState();
}