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 }
/** * <a href="http://tools.ietf.org/html/rfc5084">RFC 5084</a>: GCMParameters object. * <p> * <pre> GCMParameters ::= SEQUENCE { aes-nonce OCTET STRING, -- recommended size is 12 octets aes-ICVlen AES-GCM-ICVlen DEFAULT 12 } * </pre> */
public class GCMParameters extends ASN1Object { private byte[] nonce; private int icvLen;
Return an GCMParameters object from the given object.

Accepted inputs:

Params:
  • obj – the object we want converted.
Throws:
/** * Return an GCMParameters object from the given object. * <p> * Accepted inputs: * <ul> * <li> null &rarr; null * <li> {@link org.bouncycastle.asn1.cms.GCMParameters} object * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(Object) ASN1Sequence} input formats with GCMParameters structure inside * </ul> * * @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)).getValue().intValue(); } 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(); v.add(new DEROctetString(nonce)); if (icvLen != 12) { v.add(new ASN1Integer(icvLen)); } return new DERSequence(v); } }