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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.6 for Java 8 and later.

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package org.bouncycastle.crypto.engines;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.ExceptionMessages;
import org.bouncycastle.crypto.PacketCipher;
import org.bouncycastle.crypto.PacketCipherException;
import org.bouncycastle.crypto.modes.AESCBCModePacketCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;

public class AESNativeCBCPacketCipher
        implements PacketCipher, AESCBCModePacketCipher
{

    public AESNativeCBCPacketCipher()
    {
    }

    @Override
    public int getOutputSize(boolean encryption, CipherParameters parameters, int len)
    {
        try
        {
            checkParameters(parameters);
        }
        catch (PacketCipherException e)
        {
            e.throwCauseAsRuntimeException();
        }
        return getOutputSize(len);
    }

    @Override
    public int processPacket(boolean encryption, CipherParameters parameters, byte[] input, int inOff, int len,
                             byte[] output, int outOff)
    throws PacketCipherException
    {
        byte[] iv;
        byte[] key;
        try
        {
            if (parameters instanceof ParametersWithIV)
            {
                ParametersWithIV ivParam = (ParametersWithIV) parameters;
                iv = ivParam.getIV().clone();
                KeyParameter params = (KeyParameter) ivParam.getParameters();
                // if null it's an IV changed only.
                if (params != null)
                {
                    key = params.getKey();
                }
                else
                {
                    throw new IllegalArgumentException(ExceptionMessages.CBC_CIPHER_UNITIALIZED);
                }
            }
            else
            {
                throw new IllegalArgumentException(ExceptionMessages.INVALID_PARAM_TYPE);
            }
        }
        catch (IllegalArgumentException e)
        {
            throw PacketCipherException.from(e);
        }

        int outLen = output != null ? output.length - outOff : 0;
        int result;
        try
        {
            result = processPacket(encryption, key, iv, input, inOff, len, output, outOff,
                    outLen);
        }
        catch (Exception e)
        {
            throw PacketCipherException.from(e);
        }
        return result;
    }

    static native int getOutputSize(int len);

    static native int processPacket(boolean encryption, byte[] key, byte[] nonce, byte[] in,
                                    int inOff, int inLen, byte[] out, int outOff, int outLen);

    @Override
    public String toString()
    {
        return "CBC-PS[Native](AES[Native])";
    }
}