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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 1.4.

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package org.bouncycastle.asn1.cms;

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.util.Arrays;

/**
 * RFC 5084: GCMParameters object.
 * 
 *  
 GCMParameters ::= SEQUENCE {
   aes-nonce        OCTET STRING, -- recommended size is 12 octets
   aes-ICVlen       AES-GCM-ICVlen DEFAULT 12 }
 *


 */
public class GCMParameters
    extends ASN1Object
{
    private byte[] nonce;
    private int icvLen;

    /**
     * Return an GCMParameters object from the given object.
     *

* Accepted inputs: * * null → null * {@link org.bouncycastle.asn1.cms.GCMParameters} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(Object) ASN1Sequence} input formats with GCMParameters structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static GCMParameters getInstance( Object obj) { if (obj instanceof GCMParameters) { return (GCMParameters)obj; } else if (obj != null) { return new GCMParameters(ASN1Sequence.getInstance(obj)); } return null; } private GCMParameters( ASN1Sequence seq) { this.nonce = ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets(); if (seq.size() == 2) { this.icvLen = ASN1Integer.getInstance(seq.getObjectAt(1)).intValueExact(); } else { this.icvLen = 12; } } public GCMParameters( byte[] nonce, int icvLen) { this.nonce = Arrays.clone(nonce); this.icvLen = icvLen; } public byte[] getNonce() { return Arrays.clone(nonce); } public int getIcvLen() { return icvLen; } public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(2); v.add(new DEROctetString(nonce)); if (icvLen != 12) { v.add(new ASN1Integer(icvLen)); } return new DERSequence(v); } }