X509KeyUsage.cs :  » PDF » iTextSharp » Org » BouncyCastle » X509 » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.X509{
  /**
   * A holding class for constructing an X509 Key Usage extension.
   *
   * <pre>
   *    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) }
   * </pre>
   */
  public class X509KeyUsage
    : Asn1Encodable
  {
    public const int DigitalSignature = 1 << 7;
    public const int NonRepudiation   = 1 << 6;
    public const int KeyEncipherment  = 1 << 5;
    public const int DataEncipherment = 1 << 4;
    public const int KeyAgreement     = 1 << 3;
    public const int KeyCertSign      = 1 << 2;
    public const int CrlSign          = 1 << 1;
    public const int EncipherOnly     = 1 << 0;
    public const int DecipherOnly     = 1 << 15;

    private readonly int usage;

    /**
     * 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 override Asn1Object ToAsn1Object()
    {
      return new KeyUsage(usage);
    }
  }
}