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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.pqc.math.linearalgebra.GF2Matrix;

public class McElieceCCA2PublicKey
    extends ASN1Object
{
    private final int n;
    private final int t;
    private final GF2Matrix g;
    private final AlgorithmIdentifier digest;

    public McElieceCCA2PublicKey(int n, int t, GF2Matrix g, AlgorithmIdentifier digest)
    {
        this.n = n;
        this.t = t;
        this.g = new GF2Matrix(g.getEncoded());
        this.digest = digest;
    }

    private McElieceCCA2PublicKey(ASN1Sequence seq)
    {
        n = ((ASN1Integer)seq.getObjectAt(0)).intValueExact();

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

        g = new GF2Matrix(((ASN1OctetString)seq.getObjectAt(2)).getOctets());

        digest = AlgorithmIdentifier.getInstance(seq.getObjectAt(3));
    }

    public int getN()
    {
        return n;
    }

    public int getT()
    {
        return t;
    }

    public GF2Matrix getG()
    {
        return g;
    }

    public AlgorithmIdentifier getDigest()
    {
        return digest;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

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

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

        // encode 
        v.add(new DEROctetString(g.getEncoded()));

        v.add(digest);

        return new DERSequence(v);
    }

    public static McElieceCCA2PublicKey getInstance(Object o)
    {
        if (o instanceof McElieceCCA2PublicKey)
        {
            return (McElieceCCA2PublicKey)o;
        }
        else if (o != null)
        {
            return new McElieceCCA2PublicKey(ASN1Sequence.getInstance(o));
        }

        return null;
    }
}