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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 1.8 and up.

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package org.bouncycastle.pqc.crypto.falcon;

import org.bouncycastle.util.Arrays;

public class FalconPrivateKeyParameters
    extends FalconKeyParameters
{
    private final byte[] pk;
    private final byte[] f;
    private final byte[] g;
    private final byte[] F;

    public FalconPrivateKeyParameters(FalconParameters parameters, byte[] f, byte[] g, byte[] F, byte[] pk_encoded)
    {
        super(true, parameters);
        this.f = Arrays.clone(f);
        this.g = Arrays.clone(g);
        this.F = Arrays.clone(F);
        this.pk = Arrays.clone(pk_encoded);
    }

    public byte[] getEncoded()
    {
        return Arrays.concatenate(f, g, F);
    }

    public byte[] getPublicKey()
    {
        return Arrays.clone(pk);
    }

    public byte[] getSpolyf()
    {
        return Arrays.clone(f);
    }

    public byte[] getG()
    {
        return Arrays.clone(g);
    }

    public byte[] getSpolyF()
    {
        return Arrays.clone(F);
    }
}