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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;
import org.bouncycastle.crypto.InvalidCipherTextException;

/**
 * Base interface for a PQC encryption algorithm.
 */
public interface MessageEncryptor
{

    /**
     *
     * @param forEncrypting true if we are encrypting a signature, false
     * otherwise.
     * @param param key parameters for encryption or decryption.
     */
    public void init(boolean forEncrypting, CipherParameters param);

    /**
     *
     * @param message the message to be signed.
     * @throws Exception 
     */
    public byte[] messageEncrypt(byte[] message);

    /**
     *
     * @param cipher the cipher text of the message
     * @throws Exception 
     */
    public byte[] messageDecrypt(byte[] cipher)
        throws InvalidCipherTextException;
}