http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.jcajce.spec;


import javax.crypto.SecretKey;


A simple object to indicate that a symmetric cipher should reuse the
last key provided.

/**
 * A simple object to indicate that a symmetric cipher should reuse the
 * last key provided.
 */
public class RepeatedSecretKeySpec
    implements SecretKey
{
    private String algorithm;

    public RepeatedSecretKeySpec(String algorithm)
    {
        this.algorithm = algorithm;
    }

    public String getAlgorithm()
    {
        return algorithm;
    }

    public String getFormat()
    {
        return null;
    }

    public byte[] getEncoded()
    {
        return null;
    }
}