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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.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.ASN1TaggedObject;
import org.spongycastle.asn1.DERSequence;

public class GOST3410PublicKeyAlgParameters
    extends ASN1Object
{
    private ASN1ObjectIdentifier  publicKeyParamSet;
    private ASN1ObjectIdentifier  digestParamSet;
    private ASN1ObjectIdentifier  encryptionParamSet;
    
    public static GOST3410PublicKeyAlgParameters getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static GOST3410PublicKeyAlgParameters getInstance(
        Object obj)
    {
        if (obj instanceof GOST3410PublicKeyAlgParameters)
        {
            return (GOST3410PublicKeyAlgParameters)obj;
        }

        if(obj != null)
        {
            return new GOST3410PublicKeyAlgParameters(ASN1Sequence.getInstance(obj));
        }

        return null;
    }
    
    public GOST3410PublicKeyAlgParameters(
        ASN1ObjectIdentifier  publicKeyParamSet,
        ASN1ObjectIdentifier  digestParamSet)
    {
        this.publicKeyParamSet = publicKeyParamSet;
        this.digestParamSet = digestParamSet;
        this.encryptionParamSet = null;
    }

    public GOST3410PublicKeyAlgParameters(
        ASN1ObjectIdentifier  publicKeyParamSet,
        ASN1ObjectIdentifier  digestParamSet,
        ASN1ObjectIdentifier  encryptionParamSet)
    {
        this.publicKeyParamSet = publicKeyParamSet;
        this.digestParamSet = digestParamSet;
        this.encryptionParamSet = encryptionParamSet;
    }

    /**
     * @deprecated use getInstance()
     */
    public GOST3410PublicKeyAlgParameters(
        ASN1Sequence  seq)
    {
        this.publicKeyParamSet = (ASN1ObjectIdentifier)seq.getObjectAt(0);
        this.digestParamSet = (ASN1ObjectIdentifier)seq.getObjectAt(1);
        
        if (seq.size() > 2)
        {
            this.encryptionParamSet = (ASN1ObjectIdentifier)seq.getObjectAt(2);
        }
    }

    public ASN1ObjectIdentifier getPublicKeyParamSet()
    {
        return publicKeyParamSet;
    }

    public ASN1ObjectIdentifier getDigestParamSet()
    {
        return digestParamSet;
    }

    public ASN1ObjectIdentifier getEncryptionParamSet()
    {
        return encryptionParamSet;
    }

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

        v.add(publicKeyParamSet);
        v.add(digestParamSet);
        
        if (encryptionParamSet != null)
        {
            v.add(encryptionParamSet);
        }

        return new DERSequence(v);
    }
}