96 lines
2.7 KiB
C#
96 lines
2.7 KiB
C#
//
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// KeyedHashAlgorithm.cs: Handles keyed hash and MAC classes.
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//
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// Author:
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// Sebastien Pouliot (sebastien@ximian.com)
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//
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// (C) 2002 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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using System.Runtime.InteropServices;
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namespace System.Security.Cryptography {
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[ComVisible (true)]
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public abstract class KeyedHashAlgorithm : HashAlgorithm {
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protected byte[] KeyValue;
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protected KeyedHashAlgorithm () : base ()
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{
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// create a random 64 bits key
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}
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public virtual byte[] Key {
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get {
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return (byte[]) KeyValue.Clone ();
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}
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set {
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// can't change the key during a hashing ops
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if (State != 0) {
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throw new CryptographicException (
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Locale.GetText ("Key can't be changed at this state."));
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}
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// zeroize current key material for security
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ZeroizeKey ();
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// copy new key
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KeyValue = (byte[]) value.Clone ();
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}
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}
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protected override void Dispose (bool disposing)
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{
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// zeroize key material for security
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ZeroizeKey();
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// dispose managed resources
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// none so far
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// dispose unmanaged resources
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// none so far
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// calling base class HashAlgorithm
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base.Dispose (disposing);
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}
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private void ZeroizeKey()
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{
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if (KeyValue != null)
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Array.Clear (KeyValue, 0, KeyValue.Length);
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}
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public static new KeyedHashAlgorithm Create ()
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{
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#if FULL_AOT_RUNTIME
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return new System.Security.Cryptography.HMACSHA1 ();
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#else
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return Create ("System.Security.Cryptography.KeyedHashAlgorithm");
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#endif
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}
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public static new KeyedHashAlgorithm Create (string algName)
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{
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return (KeyedHashAlgorithm) CryptoConfig.CreateFromName (algName);
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}
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}
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}
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