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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 1.6.

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package org.bouncycastle.crypto;

/**
 * Signer with message recovery.
 */
public interface SignerWithRecovery 
    extends Signer
{
    /**
     * Returns true if the signer has recovered the full message as
     * part of signature verification.
     * 
     * @return true if full message recovered.
     */
    public boolean hasFullMessage();
    
    /**
     * Returns a reference to what message was recovered (if any).
     * 
     * @return full/partial message, null if nothing.
     */
    public byte[] getRecoveredMessage();
}