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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.asn1.cryptopro;

import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.util.Arrays;

public class Gost2814789KeyWrapParameters
    extends ASN1Object
{
    private final ASN1ObjectIdentifier encryptionParamSet;
    private final byte[] ukm;

    private Gost2814789KeyWrapParameters(ASN1Sequence seq)
    {
        if (seq.size() == 2)
        {
            this.encryptionParamSet = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(0));
            this.ukm = ASN1OctetString.getInstance(seq.getObjectAt(1)).getOctets();
        }
        else if (seq.size() == 1)
        {
            this.encryptionParamSet = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(0));
            this.ukm = null;
        }
        else
        {
            throw new IllegalArgumentException("unknown sequence length: " + seq.size());
        }
    }

    public static Gost2814789KeyWrapParameters getInstance(
        Object obj)
    {
        if (obj instanceof Gost2814789KeyWrapParameters)
        {
            return (Gost2814789KeyWrapParameters)obj;
        }

        if (obj != null)
        {
            return new Gost2814789KeyWrapParameters(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public Gost2814789KeyWrapParameters(ASN1ObjectIdentifier encryptionParamSet)
    {
        this(encryptionParamSet, null);
    }

    public Gost2814789KeyWrapParameters(ASN1ObjectIdentifier encryptionParamSet, byte[] ukm)
    {
        this.encryptionParamSet = encryptionParamSet;
        this.ukm = Arrays.clone(ukm);
    }

    public ASN1ObjectIdentifier getEncryptionParamSet()
    {
        return encryptionParamSet;
    }

    public byte[] getUkm()
    {
        return ukm;
    }

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

        v.add(encryptionParamSet);
        if (ukm != null)
        {
            v.add(new DEROctetString(ukm));
        }

        return new DERSequence(v);
    }
}