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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 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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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: CCMParameters object.
 * 

*

 CCMParameters ::= SEQUENCE {
   aes-nonce        OCTET STRING, -- recommended size is 12 octets
   aes-ICVlen       AES-CCM-ICVlen DEFAULT 12 }
 * 
*/ public class CCMParameters extends ASN1Object { private byte[] nonce; private int icvLen; /** * Return an CCMParameters object from the given object. *

* Accepted inputs: *

    *
  • null → null *
  • {@link org.bouncycastle.asn1.cms.CCMParameters} object *
  • {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(Object) ASN1Sequence} input formats with CCMParameters structure inside *
* * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static CCMParameters getInstance( Object obj) { if (obj instanceof CCMParameters) { return (CCMParameters)obj; } else if (obj != null) { return new CCMParameters(ASN1Sequence.getInstance(obj)); } return null; } private CCMParameters( 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 CCMParameters( 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); } }




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