Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/Mono.Security.Win32/Mono.Security.Cryptography/MD4CryptoServiceProvider.cs

@@ -0,0 +1,70 @@
+//
+// Mono.Security.Cryptography.MD4CryptoServiceProvider
+//
+// Authors:
+//	Sebastien Pouliot (spouliot@motus.com)
+//
+// Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
+//
+
+using System;
+using System.Security.Cryptography;
+
+namespace Mono.Security.Cryptography {
+
+public class MD4CryptoServiceProvider : MD4 {
+
+	private CapiHash hash;
+
+	public MD4CryptoServiceProvider () 
+	{
+		hash = null;
+	}
+
+	~MD4CryptoServiceProvider () 
+	{
+		Dispose (true);
+	}
+
+	// 2 cases:
+	// a. we were calculing a hash and want to abort
+	// b. we haven't started yet
+	public override void Initialize () 
+	{
+		State = 0;
+		if (hash == null) {
+			hash = new CapiHash (CryptoAPI.CALG_MD4);
+		}
+	}
+
+	protected override void Dispose (bool disposing) 
+	{
+		if (hash != null) {
+			hash.Dispose ();
+			hash = null;
+			// there's no unmanaged resources (so disposing isn't used)
+		}
+	}
+
+	protected override void HashCore (byte[] rgb, int ibStart, int cbSize) 
+	{
+		if (State == 0)
+			Initialize ();
+		if (hash == null)
+			throw new ObjectDisposedException ("MD4CryptoServiceProvider");
+		State = 1;
+		hash.HashCore (rgb, ibStart, cbSize);
+	}
+
+	protected override byte[] HashFinal () 
+	{
+		if (hash == null)
+			throw new ObjectDisposedException ("MD4CryptoServiceProvider");
+		State = 0;
+		byte[] result = hash.HashFinal ();
+		Dispose (false);
+		return result;
+	}
+}
+
+}