89 lines
1.8 KiB
C#
89 lines
1.8 KiB
C#
//
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// Mono.Security.Cryptography.RNGCryptoServiceProvider
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//
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// Authors:
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// Sebastien Pouliot (spouliot@motus.com)
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//
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// Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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//
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using System;
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using System.Security.Cryptography;
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using System.Text;
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namespace Mono.Security.Cryptography {
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public class RNGCryptoServiceProvider : RandomNumberGenerator {
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private CapiRandomNumberGenerator rng;
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private byte[] seed;
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public RNGCryptoServiceProvider ()
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{
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rng = new CapiRandomNumberGenerator ();
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seed = null;
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}
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public RNGCryptoServiceProvider (byte[] rgb)
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{
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rng = new CapiRandomNumberGenerator ();
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seed = rgb;
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}
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public RNGCryptoServiceProvider (CspParameters cspParams)
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{
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rng = new CapiRandomNumberGenerator (cspParams);
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seed = null;
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}
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public RNGCryptoServiceProvider (string str)
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{
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rng = new CapiRandomNumberGenerator ();
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seed = Encoding.Default.GetBytes (str);
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}
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~RNGCryptoServiceProvider ()
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{
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// zeroize seed
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if (seed != null)
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Array.Clear (seed, 0, seed.Length);
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// release unmanaged resources
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rng.Dispose ();
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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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// send the seed
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if (seed != null)
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rng.GenRandom (seed);
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// note: by doing this seed is modified each time
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rng.GenRandom (data);
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// generate random
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if (!rng.Result)
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throw new CryptographicException (rng.Error);
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}
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public override void GetNonZeroBytes (byte[] data)
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{
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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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GetBytes (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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