org.bouncycastle.asn1.cms.GCMParameters Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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/***************************************************************/
/******    DO NOT EDIT THIS CLASS bc-java SOURCE FILE     ******/
/***************************************************************/
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)).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);
    }
}