sha1cryptoserviceprovider.cs

本源码为OpenNETCF源代码

//==========================================================================================
//
//		OpenNETCF.Windows.Forms.SHA1CryptoServiceProvider
//		Copyright (c) 2003, OpenNETCF.org
//
//		This library is free software; you can redistribute it and/or modify it under 
//		the terms of the OpenNETCF.org Shared Source License.
//
//		This library is distributed in the hope that it will be useful, but 
//		WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
//		FITNESS FOR A PARTICULAR PURPOSE. See the OpenNETCF.org Shared Source License 
//		for more details.
//
//		You should have received a copy of the OpenNETCF.org Shared Source License 
//		along with this library; if not, email [e-mail] to request a copy.
//
//		If you wish to contact the OpenNETCF Advisory Board to discuss licensing, please 
//		email [e-mail].
//
//		For general enquiries, email [e-mail] or visit our website at:
//		http://www.opennetcf.org
//
//		!!! A HUGE thank-you goes out to Casey Chesnut for supplying this class library !!!
//      !!! You can contact Casey at http://www.brains-n-brawn.com                      !!!
//
//==========================================================================================
using System;
using OpenNETCF.Security.Cryptography.NativeMethods;

namespace OpenNETCF.Security.Cryptography
{
	public sealed class SHA1CryptoServiceProvider : SHA1
	{
		public SHA1CryptoServiceProvider()
		{

		}

		private byte [] hash = null;
		public override byte[] Hash 
		{ 
			get{return hash;}
		}

		public override int HashSize 
		{ 
			get{return 160;}
		}

		public override byte [] ComputeHash(byte [] buffer)
		{
			byte [] retBa = OpenNETCF.Security.Cryptography.NativeMethods.Hash.ComputeHash(CalgHash.SHA1, buffer);
			if(retBa.Length != 20)
				throw new Exception("Sha1 hash value is not 160 bits");
			return retBa;
		}
	}
}