DrawingTestHelper.NetDrawingTest.CalculateSHA1 C# (CSharp) Method

		public override string CalculateSHA1() {
			Rectangle r = new Rectangle(0, 0, _bitmap.Width, _bitmap.Height);
			
			BitmapData data = _bitmap.LockBits (r, ImageLockMode.ReadOnly,
				_bitmap.PixelFormat);
			int dataSize = data.Stride * data.Height;
			byte [] bdata = new byte [dataSize];
			Marshal.Copy (data.Scan0, bdata, 0, dataSize);
			_bitmap.UnlockBits (data);

			SHA1 sha1 = new SHA1CryptoServiceProvider ();
			byte [] resdata = sha1.ComputeHash (bdata);
			return Convert.ToBase64String (resdata);
		}