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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 2.73.7 for Java 8 and later.

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package org.bouncycastle.crypto.params;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.util.RadixConverter;
import org.bouncycastle.util.Arrays;

public final class FPEParameters
    implements CipherParameters
{
    private final KeyParameter key;
    private final RadixConverter radixConverter;
    private final byte[] tweak;
    private final boolean useInverse;

    public FPEParameters(KeyParameter key, int radix, byte[] tweak)
    {
        this(key, radix, tweak, false);
    }

    public FPEParameters(KeyParameter key, int radix, byte[] tweak, boolean useInverse)
    {
        this(key, new RadixConverter(radix), tweak, useInverse);
    }

    public FPEParameters(KeyParameter key, RadixConverter radixConverter, byte[] tweak, boolean useInverse)
    {
        this.key = key;
        this.radixConverter = radixConverter;
        this.tweak = Arrays.clone(tweak);
        this.useInverse = useInverse;
    }

    public KeyParameter getKey()
    {
        return key;
    }

    public int getRadix()
    {
        return radixConverter.getRadix();
    }

    public RadixConverter getRadixConverter()
    {
        return radixConverter;
    }

    public byte[] getTweak()
    {
        return Arrays.clone(tweak);
    }

    public boolean isUsingInverseFunction()
    {
        return useInverse;
    }
}