91 lines
2.8 KiB
C#
91 lines
2.8 KiB
C#
//
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// System.Guid.cs
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//
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// Authors:
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// Duco Fijma (duco@lorentz.xs4all.nl)
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// Sebastien Pouliot (sebastien@ximian.com)
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// Jb Evain (jbevain@novell.com)
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// Marek Safar (marek.safar@gmail.com)
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//
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// (C) 2002 Duco Fijma
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// Copyright (C) 2004-2010 Novell, Inc (http://www.novell.com)
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// Copyright 2012, 2014 Xamarin, Inc (http://www.xamarin.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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#if !(MONOTOUCH && FULL_AOT_RUNTIME)
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using System.Security.Cryptography;
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namespace System
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{
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partial struct Guid
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{
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private static object _rngAccess = new object ();
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private static RandomNumberGenerator _rng;
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private static RandomNumberGenerator _fastRng;
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public static Guid NewGuid ()
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{
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byte[] b = new byte [16];
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// thread-safe access to the prng
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lock (_rngAccess) {
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if (_rng == null)
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_rng = RandomNumberGenerator.Create ();
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_rng.GetBytes (b);
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}
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Guid res = new Guid (b);
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// Mask in Variant 1-0 in Bit[7..6]
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res._d = (byte) ((res._d & 0x3fu) | 0x80u);
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// Mask in Version 4 (random based Guid) in Bits[15..13]
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res._c = (short) ((res._c & 0x0fffu) | 0x4000u);
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return res;
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}
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// used in ModuleBuilder so mcs doesn't need to invoke
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// CryptoConfig for simple assemblies.
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internal static byte[] FastNewGuidArray ()
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{
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byte[] guid = new byte [16];
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// thread-safe access to the prng
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lock (_rngAccess) {
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// if known, use preferred RNG
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if (_rng != null)
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_fastRng = _rng;
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// else use hardcoded default RNG (bypassing CryptoConfig)
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if (_fastRng == null)
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_fastRng = new RNGCryptoServiceProvider ();
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_fastRng.GetBytes (guid);
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}
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// Mask in Variant 1-0 in Bit[7..6]
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guid [8] = (byte) ((guid [8] & 0x3f) | 0x80);
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// Mask in Version 4 (random based Guid) in Bits[15..13]
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guid [7] = (byte) ((guid [7] & 0x0f) | 0x40);
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return guid;
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}
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}
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}
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#endif |