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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.asn1.cryptopro;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.util.Arrays;

/**
 *  * Gost28147-89-EncryptedKey ::=   SEQUENCE {
 *       encryptedKey         Gost28147-89-Key,
 *       maskKey              [0] IMPLICIT Gost28147-89-Key
 *                                 OPTIONAL,
 *       macKey               Gost28147-89-MAC
 * }
 * 
 */
public class Gost2814789EncryptedKey
    extends ASN1Object
{
    private final byte[] encryptedKey;
    private final byte[] maskKey;
    private final byte[] macKey;

    private Gost2814789EncryptedKey(ASN1Sequence seq)
    {
        if (seq.size() == 2)
        {
            encryptedKey = Arrays.clone(ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets());
            macKey = Arrays.clone(ASN1OctetString.getInstance(seq.getObjectAt(1)).getOctets());
            maskKey = null;
        }
        else if (seq.size() == 3)
        {
            encryptedKey = Arrays.clone(ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets());
            maskKey = Arrays.clone(ASN1OctetString.getInstance(ASN1TaggedObject.getInstance(seq.getObjectAt(1)), false).getOctets());
            macKey = Arrays.clone(ASN1OctetString.getInstance(seq.getObjectAt(2)).getOctets());
        }
        else
        {
            throw new IllegalArgumentException("unknown sequence length: " + seq.size());
        }
    }

    public static Gost2814789EncryptedKey getInstance(
        Object obj)
    {
        if (obj instanceof Gost2814789EncryptedKey)
        {
            return (Gost2814789EncryptedKey)obj;
        }

        if (obj != null)
        {
            return new Gost2814789EncryptedKey(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public Gost2814789EncryptedKey(byte[] encryptedKey, byte[] macKey)
    {
        this(encryptedKey, null, macKey);
    }

    public Gost2814789EncryptedKey(byte[] encryptedKey, byte[] maskKey, byte[] macKey)
    {
        this.encryptedKey = Arrays.clone(encryptedKey);
        this.maskKey = Arrays.clone(maskKey);
        this.macKey = Arrays.clone(macKey);
    }

    public byte[] getEncryptedKey()
    {
        return Arrays.clone(encryptedKey);
    }

    public byte[] getMaskKey()
    {
        return Arrays.clone(maskKey);
    }

    public byte[] getMacKey()
    {
        return Arrays.clone(macKey);
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(new DEROctetString(encryptedKey));
        if (maskKey != null)
        {
            v.add(new DERTaggedObject(false, 0, new DEROctetString(encryptedKey)));
        }
        v.add(new DEROctetString(macKey));
        
        return new DERSequence(v);
    }
}