89 lines
2.7 KiB
C#
89 lines
2.7 KiB
C#
//
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// RngCryptoServiceProvider.cryptor.cs: based on Mono's System.Security.Cryptography.RNGCryptoServiceProvider
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//
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// Authors:
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// Mark Crichton (crichton@gimp.org)
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// Sebastien Pouliot (sebastien@xamarun.com)
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//
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// (C) 2002
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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// Copyright (C) 2012-2014 Xamarin Inc.
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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 Crimson.CommonCrypto;
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// http://developer.apple.com/library/ios/#DOCUMENTATION/Security/Reference/RandomizationReference/Reference/reference.html
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// we need to use the CommonCrypto implementation instead of the runtime-supported RNGCryptoServiceProvider
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// since we have no guarantee (on iOS) about /dev/[u]random availability or quality
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#if MONOTOUCH || XAMMAC
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namespace System.Security.Cryptography {
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public class RNGCryptoServiceProvider : RandomNumberGenerator {
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public RNGCryptoServiceProvider ()
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{
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}
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public RNGCryptoServiceProvider (byte[] rgb)
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{
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}
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public RNGCryptoServiceProvider (CspParameters cspParams)
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{
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}
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public RNGCryptoServiceProvider (string str)
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{
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}
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~RNGCryptoServiceProvider ()
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{
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}
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public override void GetBytes (byte[] data)
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{
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if (data == null)
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throw new ArgumentNullException ("data");
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Cryptor.GetRandom (data);
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}
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public override void GetNonZeroBytes (byte[] data)
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{
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if (data == null)
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throw new ArgumentNullException ("data");
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byte[] random = new byte [data.Length * 2];
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int i = 0;
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// one pass should be enough but hey this is random ;-)
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while (i < data.Length) {
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Cryptor.GetRandom (random);
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for (int j=0; j < random.Length; j++) {
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if (i == data.Length)
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break;
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if (random [j] != 0)
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data [i++] = random [j];
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}
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}
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}
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}
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}
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#endif
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