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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 1.5 and up.

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package org.bouncycastle.pqc.asn1;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.pqc.math.linearalgebra.GF2Matrix;
import org.bouncycastle.pqc.math.linearalgebra.GF2mField;
import org.bouncycastle.pqc.math.linearalgebra.Permutation;
import org.bouncycastle.pqc.math.linearalgebra.PolynomialGF2mSmallM;

public class McEliecePrivateKey
    extends ASN1Object
{
    private int n;
    private int k;
    private byte[] encField;
    private byte[] encGp;
    private byte[] encSInv;
    private byte[] encP1;
    private byte[] encP2;

    public McEliecePrivateKey(int n, int k, GF2mField field, PolynomialGF2mSmallM goppaPoly, Permutation p1, Permutation p2, GF2Matrix sInv)
    {
        this.n = n;
        this.k = k;
        this.encField = field.getEncoded();
        this.encGp = goppaPoly.getEncoded();
        this.encSInv = sInv.getEncoded();
        this.encP1 = p1.getEncoded();
        this.encP2 = p2.getEncoded();
    }

    public static McEliecePrivateKey getInstance(Object o)
    {
        if (o instanceof McEliecePrivateKey)
        {
            return (McEliecePrivateKey)o;
        }
        else if (o != null)
        {
            return new McEliecePrivateKey(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    private McEliecePrivateKey(ASN1Sequence seq)
    {
        n = ((ASN1Integer)seq.getObjectAt(0)).intValueExact();

        k = ((ASN1Integer)seq.getObjectAt(1)).intValueExact();

        encField = ((ASN1OctetString)seq.getObjectAt(2)).getOctets();

        encGp = ((ASN1OctetString)seq.getObjectAt(3)).getOctets();

        encP1 = ((ASN1OctetString)seq.getObjectAt(4)).getOctets();

        encP2 = ((ASN1OctetString)seq.getObjectAt(5)).getOctets();

        encSInv = ((ASN1OctetString)seq.getObjectAt(6)).getOctets();
    }

    public int getN()
    {
        return n;
    }

    public int getK()
    {
        return k;
    }

    public GF2mField getField()
    {
        return new GF2mField(encField);
    }

    public PolynomialGF2mSmallM getGoppaPoly()
    {
        return new PolynomialGF2mSmallM(this.getField(), encGp);
    }

    public GF2Matrix getSInv()
    {
        return new GF2Matrix(encSInv);
    }

    public Permutation getP1()
    {
        return new Permutation(encP1);
    }

    public Permutation getP2()
    {
        return new Permutation(encP2);
    }


    public ASN1Primitive toASN1Primitive()
    {

        ASN1EncodableVector v = new ASN1EncodableVector();

        // encode 
        v.add(new ASN1Integer(n));

        // encode 
        v.add(new ASN1Integer(k));

        // encode 
        v.add(new DEROctetString(encField));

        // encode 
        v.add(new DEROctetString(encGp));

        // encode 
        v.add(new DEROctetString(encP1));

        // encode 
        v.add(new DEROctetString(encP2));

        // encode 
        v.add(new DEROctetString(encSInv));

        return new DERSequence(v);
    }
}