mcs/class/corlib/System/Guid.cs

   1 //
   2 // System.Guid.cs
   3 //
   4 // Authors:
   5 //      Duco Fijma (duco@lorentz.xs4all.nl)
   6 //      Sebastien Pouliot (sebastien@ximian.com)
   7 //      Jb Evain (jbevain@novell.com)
   8 //      Marek Safar (marek.safar@gmail.com)
   9 //
  10 // (C) 2002 Duco Fijma
  11 // Copyright (C) 2004-2010 Novell, Inc (http://www.novell.com)
  12 // Copyright 2012, 2014 Xamarin, Inc (http://www.xamarin.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33 #if !(MONOTOUCH && FULL_AOT_RUNTIME)
  34
  35 using System.Security.Cryptography;
  36
  37 namespace System
  38 {
  39         partial struct Guid
  40         {
  41                 // used in ModuleBuilder so mcs doesn't need to invoke
  42                 // CryptoConfig for simple assemblies.
  43                 internal static unsafe byte[] FastNewGuidArray ()
  44                 {
  45                         byte[] guid = new byte [16];
  46                         fixed (byte *ptr = guid) {
  47                                 Interop.GetRandomBytes(ptr, 16);
  48                         }
  49
  50                         // Mask in Variant 1-0 in Bit[7..6]
  51                         guid [8] = (byte) ((guid [8] & 0x3f) | 0x80);
  52                         // Mask in Version 4 (random based Guid) in Bits[15..13]
  53                         guid [7] = (byte) ((guid [7] & 0x0f) | 0x40);
  54
  55                         return guid;
  56                 }
  57         }
  58 }
  59
  60 #endif