Initial Commit

iTechSharp/srcbc/crypto/prng/CryptoApiRandomGenerator.cs

@@ -0,0 +1,61 @@
+#if !NETCF_1_0
+
+using System;
+using System.Security.Cryptography;
+
+namespace Org.BouncyCastle.Crypto.Prng
+{
+	/// <summary>
+	/// Uses Microsoft's RNGCryptoServiceProvider
+	/// </summary>
+	public class CryptoApiRandomGenerator
+		: IRandomGenerator
+	{
+		private readonly RNGCryptoServiceProvider rndProv;
+
+		public CryptoApiRandomGenerator()
+		{
+			rndProv = new RNGCryptoServiceProvider();
+		}
+
+		#region IRandomGenerator Members
+
+		public virtual void AddSeedMaterial(byte[] seed)
+		{
+			// We don't care about the seed
+		}
+
+		public virtual void AddSeedMaterial(long seed)
+		{
+			// We don't care about the seed
+		}
+
+		public virtual void NextBytes(byte[] bytes)
+		{
+			rndProv.GetBytes(bytes);
+		}
+
+		public virtual void NextBytes(byte[] bytes, int start, int len)
+		{
+			if (start < 0)
+				throw new ArgumentException("Start offset cannot be negative", "start");
+			if (bytes.Length < (start + len))
+				throw new ArgumentException("Byte array too small for requested offset and length");
+
+			if (bytes.Length == len && start == 0) 
+			{
+				NextBytes(bytes);
+			}
+			else 
+			{
+				byte[] tmpBuf = new byte[len];
+				rndProv.GetBytes(tmpBuf);
+				Array.Copy(tmpBuf, 0, bytes, start, len);
+			}
+		}
+
+		#endregion
+	}
+}
+
+#endif