DES加密解密

/// /// 加密類

/// date:2012-04-23 pm.
/// 
public class encrypt
;private encrypt() 
/// /// 建立加密類物件.
/// 
public static encrypt createcryptoserviceprovider()
/// /// des加密.
/// 
/// 待加密字串.
/// 加密金鑰. 8位
/// 
public string desencrypt(string _encryptstr,string _encryptkey)
catch (exception)
}/// /// des解密.
/// 
/// 等解密的字串.
/// 解密金鑰. 8位
/// 
public string desdecrypt(string _decryptstr, string _decryptkey)
des rogerdes = new descryptoserviceprovider();
memorystream rogerms = new memorystream();
cryptostream rogercs = new cryptostream(rogerms, rogerdes.createdecryptor(rogerkey, rogeriv), cryptostreammode.write);
rogercs.write(encryptbytedata, 0, encryptbytedata.length);
rogercs.flushfinalblock();
string result = encoding.default.getstring(rogerms.toarray());
return result;
}catch (exception)
}}

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