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This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).

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