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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.tls.crypto;

import java.io.IOException;

import org.spongycastle.util.Arrays;

/**
 * The cipher for TLS_NULL_WITH_NULL_NULL.
 */
public class TlsNullNullCipher
    implements TlsCipher
{
    public int getPlaintextLimit(int ciphertextLimit)
    {
        return ciphertextLimit;
    }

    public byte[] encodePlaintext(long seqNo, short type, byte[] plaintext, int offset, int len)
        throws IOException
    {
        return Arrays.copyOfRange(plaintext, offset, offset + len);
    }

    public byte[] decodeCiphertext(long seqNo, short type, byte[] ciphertext, int offset, int len)
        throws IOException
    {
        return Arrays.copyOfRange(ciphertext, offset, offset + len);
    }
}