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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 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.pqc.crypto;

import org.bouncycastle.crypto.CipherParameters;

/**
 * Base interface for a PQC signing algorithm.
 */
public interface MessageSigner
{
    /**
     * initialise the signer for signature generation or signature
     * verification.
     *
     * @param forSigning true if we are generating a signature, false
     *                   otherwise.
     * @param param      key parameters for signature generation.
     */
    public void init(boolean forSigning, CipherParameters param);

    /**
     * sign the passed in message (usually the output of a hash function).
     *
     * @param message the message to be signed.
     * @return the signature of the message
     */
    public byte[] generateSignature(byte[] message);

    /**
     * verify the message message against the signature value.
     *
     * @param message the message that was supposed to have been signed.
     * @param signature the signature of the message
     */
    public boolean verifySignature(byte[] message, byte[] signature);
}




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