//
// System.Security.Cryptography.RNGCryptoServiceProvider
//
-// Author: Mark Crichton (crichton@gimp.org)
+// Authors:
+// Mark Crichton (crichton@gimp.org)
+// Sebastien Pouliot (sebastien@ximian.com)
//
// (C) 2002
+// 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.
//
// "In the beginning there was Chaos,
// Great Power without form."
// -- The Verrah Rubicon of Verena, Book One
-using System;
+using System.Globalization;
using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
namespace System.Security.Cryptography {
- public class RNGCryptoServiceProvider : RandomNumberGenerator {
-
- [MonoTODO]
- public RNGCryptoServiceProvider () {
- // This will get some meaning when I figure out what the other
- // three constructors do.
+#if !NET_2_1
+ [ComVisible (true)]
+#endif
+ public sealed class RNGCryptoServiceProvider : RandomNumberGenerator {
+ private static object _lock;
+ private IntPtr _handle;
+
+ static RNGCryptoServiceProvider ()
+ {
+ if (RngOpen ())
+ _lock = new object ();
}
-
- [MonoTODO]
- public RNGCryptoServiceProvider (byte[] rgb) {
- // Ok, not called by app code... someone must call it, though.
+
+ public RNGCryptoServiceProvider ()
+ {
+ _handle = RngInitialize (null);
+ Check ();
}
-
- [MonoTODO]
- public RNGCryptoServiceProvider (CspParameters cspParams) {
- // Why do I have this feeling this is the MS CryptAPI...
+#if !NET_2_1
+ public RNGCryptoServiceProvider (byte[] rgb)
+ {
+ _handle = RngInitialize (rgb);
+ Check ();
}
- [MonoTODO]
- public RNGCryptoServiceProvider (string str) {
- // More !application code. Interesting...
+ public RNGCryptoServiceProvider (CspParameters cspParams)
+ {
+ // CSP selection isn't supported but we still return
+ // random data (no exception) for compatibility
+ _handle = RngInitialize (null);
+ Check ();
}
+ public RNGCryptoServiceProvider (string str)
+ {
+ if (str == null)
+ _handle = RngInitialize (null);
+ else
+ _handle = RngInitialize (Encoding.UTF8.GetBytes (str));
+ Check ();
+ }
+#endif
+ private void Check ()
+ {
+ if (_handle == IntPtr.Zero) {
+ throw new CryptographicException (
+ Locale.GetText ("Couldn't access random source."));
+ }
+ }
+
[MethodImplAttribute(MethodImplOptions.InternalCall)]
- public extern override void GetBytes (byte[] data);
+ private static extern bool RngOpen ();
[MethodImplAttribute(MethodImplOptions.InternalCall)]
- public extern override void GetNonZeroBytes (byte[] data);
+ private static extern IntPtr RngInitialize (byte[] seed);
+
+ [MethodImplAttribute(MethodImplOptions.InternalCall)]
+ private static extern IntPtr RngGetBytes (IntPtr handle, byte[] data);
+
+ [MethodImplAttribute(MethodImplOptions.InternalCall)]
+ private static extern void RngClose (IntPtr handle);
+
+ public override void GetBytes (byte[] data)
+ {
+ if (data == null)
+ throw new ArgumentNullException ("data");
+
+ if (_lock == null) {
+ _handle = RngGetBytes (_handle, data);
+ } else {
+ // using a global handle for randomness
+ lock (_lock) {
+ _handle = RngGetBytes (_handle, data);
+ }
+ }
+ Check ();
+ }
- ~RNGCryptoServiceProvider () {
- // FIN?
+ public override void GetNonZeroBytes (byte[] data)
+ {
+ if (data == null)
+ throw new ArgumentNullException ("data");
+
+ byte[] random = new byte [data.Length * 2];
+ int i = 0;
+ // one pass should be enough but hey this is random ;-)
+ while (i < data.Length) {
+ _handle = RngGetBytes (_handle, random);
+ Check ();
+ for (int j=0; j < random.Length; j++) {
+ if (i == data.Length)
+ break;
+ if (random [j] != 0)
+ data [i++] = random [j];
+ }
+ }
+ }
+
+ ~RNGCryptoServiceProvider ()
+ {
+ if (_handle != IntPtr.Zero) {
+ RngClose (_handle);
+ _handle = IntPtr.Zero;
+ }
+ }
+
+#if NET_4_0 || MOONLIGHT
+ protected override void Dispose (bool disposing)
+ {
+ base.Dispose (disposing);
}
+#endif
}
}
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