CngAlgorithm.cs :  » 2.6.4-mono-.net-core » System.Security » System » Security » Cryptography » C# / CSharp Open Source

//
// System.Security.Cryptography.CngAlgorithm
//
// Authors:
//  Sebastien Pouliot  <sebastien@ximian.com>
//
// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;

namespace System.Security.Cryptography{

  // note: CNG stands for "Cryptography API: Next Generation"

  [Serializable]
  public sealed class CngAlgorithm : IEquatable<CngAlgorithm> {

    private string algo;

    public CngAlgorithm (string algorithm)
    {
      if (algorithm == null)
        throw new ArgumentNullException ("algorithm");
      if (algorithm.Length == 0)
        throw new ArgumentException ("algorithm");

      algo = algorithm;
    }

    public string Algorithm {
      get { return algo; }
    }

    public bool Equals (CngAlgorithm other)
    {
      if (other == null)
        return false;
      return algo == other.algo;
    }

    public override bool Equals (object obj)
    {
      return Equals (obj as CngAlgorithm);
    }

    public override int GetHashCode ()
    {
      return algo.GetHashCode ();
    }

    public override string ToString ()
    {
      return algo;
    }

    // static

    static CngAlgorithm dh256;
    static CngAlgorithm dh384;
    static CngAlgorithm dh521;
    static CngAlgorithm dsa256;
    static CngAlgorithm dsa384;
    static CngAlgorithm dsa521;
    static CngAlgorithm md5;
    static CngAlgorithm sha1;
    static CngAlgorithm sha256;
    static CngAlgorithm sha384;
    static CngAlgorithm sha512;

    public static CngAlgorithm ECDiffieHellmanP256 {
      get {
        if (dh256 == null)
          dh256 = new CngAlgorithm ("ECDH_P256");
        return dh256;
      }
    }

    public static CngAlgorithm ECDiffieHellmanP384 {
      get {
        if (dh384 == null)
          dh384 = new CngAlgorithm ("ECDH_P384");
        return dh384;
      }
    }

    public static CngAlgorithm ECDiffieHellmanP521 {
      get {
        if (dh521 == null)
          dh521 = new CngAlgorithm ("ECDH_P521");
        return dh521;
      }
    }

    public static CngAlgorithm ECDsaP256 {
      get {
        if (dsa256 == null)
          dsa256 = new CngAlgorithm ("ECDSA_P256");
        return dsa256;
      }
    }

    public static CngAlgorithm ECDsaP384 {
      get {
        if (dsa384 == null)
          dsa384 = new CngAlgorithm ("ECDSA_P384");
        return dsa384;
      }
    }

    public static CngAlgorithm ECDsaP521 {
      get {
        if (dsa521 == null)
          dsa521 = new CngAlgorithm ("ECDSA_P521");
        return dsa521;
      }
    }

    public static CngAlgorithm MD5 {
      get {
        if (md5 == null)
          md5 = new CngAlgorithm ("MD5");
        return md5;
      }
    }

    public static CngAlgorithm Sha1 {
      get {
        if (sha1 == null)
          sha1 = new CngAlgorithm ("SHA1");
        return sha1;
      }
    }

    public static CngAlgorithm Sha256 {
      get {
        if (sha256 == null)
          sha256 = new CngAlgorithm ("SHA256");
        return sha256;
      }
    }

    public static CngAlgorithm Sha384 {
      get {
        if (sha384 == null)
          sha384 = new CngAlgorithm ("SHA384");
        return sha384;
      }
    }

    public static CngAlgorithm Sha512 {
      get {
        if (sha512 == null)
          sha512 = new CngAlgorithm ("SHA512");
        return sha512;
      }
    }

    public static bool operator == (CngAlgorithm left, CngAlgorithm right)
    {
      if ((object)left == null)
        return ((object)right == null);
      if ((object)right == null)
        return false;
      return left.algo == right.algo;
    }

    public static bool operator != (CngAlgorithm left, CngAlgorithm right)
    {
      if ((object)left == null)
        return ((object)right != null);
      if ((object)right == null)
        return true;
      return left.algo != right.algo;
    }
  }
}