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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 1.6.

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package org.bouncycastle.jce;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.x509.KeyUsage;

/**
 * A holding class for constructing an X509 Key Usage extension.
 *
 * 
 *    id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
 *
 *    KeyUsage ::= BIT STRING {
 *         digitalSignature        (0),
 *         nonRepudiation          (1),
 *         keyEncipherment         (2),
 *         dataEncipherment        (3),
 *         keyAgreement            (4),
 *         keyCertSign             (5),
 *         cRLSign                 (6),
 *         encipherOnly            (7),
 *         decipherOnly            (8) }
 * 
*/ public class X509KeyUsage extends ASN1Encodable { public static final int digitalSignature = 1 << 7; public static final int nonRepudiation = 1 << 6; public static final int keyEncipherment = 1 << 5; public static final int dataEncipherment = 1 << 4; public static final int keyAgreement = 1 << 3; public static final int keyCertSign = 1 << 2; public static final int cRLSign = 1 << 1; public static final int encipherOnly = 1 << 0; public static final int decipherOnly = 1 << 15; private int usage = 0; /** * Basic constructor. * * @param usage - the bitwise OR of the Key Usage flags giving the * allowed uses for the key. * e.g. (X509KeyUsage.keyEncipherment | X509KeyUsage.dataEncipherment) */ public X509KeyUsage( int usage) { this.usage = usage; } public DERObject toASN1Object() { return new KeyUsage(usage); } }




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