2 // System.Security.Cryptography.RNGCryptoServiceProvider
5 // Mark Crichton (crichton@gimp.org)
6 // Sebastien Pouliot (sebastien@ximian.com)
9 // Copyright (C) 2004 Novell (http://www.novell.com)
13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
15 // Permission is hereby granted, free of charge, to any person obtaining
16 // a copy of this software and associated documentation files (the
17 // "Software"), to deal in the Software without restriction, including
18 // without limitation the rights to use, copy, modify, merge, publish,
19 // distribute, sublicense, and/or sell copies of the Software, and to
20 // permit persons to whom the Software is furnished to do so, subject to
21 // the following conditions:
23 // The above copyright notice and this permission notice shall be
24 // included in all copies or substantial portions of the Software.
26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 // "In the beginning there was Chaos,
36 // and within this Chaos was Power,
37 // Great Power without form."
38 // -- The Verrah Rubicon of Verena, Book One
41 using System.Globalization;
42 using System.Runtime.CompilerServices;
45 namespace System.Security.Cryptography {
48 public class RNGCryptoServiceProvider : RandomNumberGenerator {
50 public sealed class RNGCryptoServiceProvider : RandomNumberGenerator {
52 private IntPtr _handle;
54 public RNGCryptoServiceProvider ()
56 _handle = RngInitialize (null);
60 public RNGCryptoServiceProvider (byte[] rgb)
62 _handle = RngInitialize (rgb);
66 public RNGCryptoServiceProvider (CspParameters cspParams)
68 // CSP selection isn't supported but we still return
69 // random data (no exception) for compatibility
70 _handle = RngInitialize (null);
74 public RNGCryptoServiceProvider (string str)
77 _handle = RngInitialize (null);
79 _handle = RngInitialize (Encoding.UTF8.GetBytes (str));
85 if (_handle == IntPtr.Zero) {
86 throw new CryptographicException (
87 Locale.GetText ("Couldn't access random source."));
91 [MethodImplAttribute(MethodImplOptions.InternalCall)]
92 private static extern IntPtr RngInitialize (byte[] seed);
94 [MethodImplAttribute(MethodImplOptions.InternalCall)]
95 private static extern IntPtr RngGetBytes (IntPtr handle, byte[] data);
97 [MethodImplAttribute(MethodImplOptions.InternalCall)]
98 private static extern void RngClose (IntPtr handle);
100 public override void GetBytes (byte[] data)
103 throw new ArgumentNullException ("data");
105 _handle = RngGetBytes (_handle, data);
109 public override void GetNonZeroBytes (byte[] data)
112 throw new ArgumentNullException ("data");
114 byte[] random = new byte [data.Length * 2];
116 // one pass should be enough but hey this is random ;-)
117 while (i < data.Length) {
118 _handle = RngGetBytes (_handle, random);
120 for (int j=0; j < random.Length; j++) {
121 if (i == data.Length)
124 data [i++] = random [j];
129 ~RNGCryptoServiceProvider ()
131 if (_handle != IntPtr.Zero) {
133 _handle = IntPtr.Zero;