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//
// MACTripleDES.cs: Handles MAC with TripleDES
//
// Author:
// Sebastien Pouliot (sebastien@ximian.com)
//
// (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005 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.
//
#if !NET_2_1 || MONOTOUCH
using System.Runtime.InteropServices;
using Mono.Security.Cryptography;
namespace System.Security.Cryptography {
// References:
// a. FIPS PUB 81: DES MODES OF OPERATION
// MAC: Appendix F (MACDES not MACTripleDES but close enough ;-)
// http://www.itl.nist.gov/fipspubs/fip81.htm
// LAMESPEC: MACTripleDES == MAC-CBC using TripleDES (not MAC-CFB).
#if NET_2_0
[ComVisible (true)]
#endif
public class MACTripleDES: KeyedHashAlgorithm {
private TripleDES tdes;
private MACAlgorithm mac;
private bool m_disposed;
public MACTripleDES ()
{
Setup ("TripleDES", null);
}
public MACTripleDES (byte[] rgbKey)
{
if (rgbKey == null)
throw new ArgumentNullException ("rgbKey");
Setup ("TripleDES", rgbKey);
}
public MACTripleDES (string strTripleDES, byte[] rgbKey)
{
if (rgbKey == null)
throw new ArgumentNullException ("rgbKey");
if (strTripleDES == null)
Setup ("TripleDES", rgbKey);
else
Setup (strTripleDES, rgbKey);
}
private void Setup (string strTripleDES, byte[] rgbKey)
{
tdes = TripleDES.Create (strTripleDES);
// default padding (as using in Fx 1.0 and 1.1)
tdes.Padding = PaddingMode.Zeros;
// if rgbKey is null we keep the randomly generated key
if (rgbKey != null) {
// this way we get the TripleDES key validation (like weak
// and semi-weak keys)
tdes.Key = rgbKey;
}
HashSizeValue = tdes.BlockSize;
// we use Key property to get the additional validations
// (from KeyedHashAlgorithm ancestor)
Key = tdes.Key;
mac = new MACAlgorithm (tdes);
m_disposed = false;
}
~MACTripleDES ()
{
Dispose (false);
}
#if NET_2_0
[ComVisible (false)]
public PaddingMode Padding {
get { return tdes.Padding; }
set { tdes.Padding = value; }
}
#endif
protected override void Dispose (bool disposing)
{
if (!m_disposed) {
// note: we ALWAYS zeroize keys (disposing or not)
// clear our copy of the secret key
if (KeyValue != null)
Array.Clear (KeyValue, 0, KeyValue.Length);
// clear the secret key (inside TripleDES)
if (tdes != null)
tdes.Clear ();
if (disposing) {
// disposed managed stuff
KeyValue = null;
tdes = null;
}
// ancestor
base.Dispose (disposing);
m_disposed = true;
}
}
public override void Initialize ()
{
if (m_disposed)
throw new ObjectDisposedException ("MACTripleDES");
State = 0;
mac.Initialize (KeyValue);
}
protected override void HashCore (byte[] rgbData, int ibStart, int cbSize)
{
if (m_disposed)
throw new ObjectDisposedException ("MACTripleDES");
if (State == 0) {
Initialize ();
State = 1;
}
mac.Core (rgbData, ibStart, cbSize);
}
protected override byte[] HashFinal ()
{
if (m_disposed)
throw new ObjectDisposedException ("MACTripleDES");
State = 0;
return mac.Final ();
}
}
}
#endif
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