加到300分，求在JAVA下的“PBEWithMD5AndDES”加密算法，到C#下怎么实现？(二）

//07import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.PBEKeySpec;import javax.crypto.spec.PBEParameterSpec;//09import java.security.MessageDigest;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;//BASE64import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;public class pubwin2009{    // key1 姓名身份证加解密 07/09      public static String Rcode(String message,int type)throws Exception        {            //String Key="123!@#qweQWE/.,?><abc";    //07            String Key="[email protected]#we>WacE/.Q,?<b";        //09            byte _fldint[] = { -87, -101, -56, 50, 86, 53, -29, 3};            byte bytesrc[];             if (type==1)            bytesrc =message.getBytes("UTF8");            else            bytesrc =(new BASE64Decoder()).decodeBuffer(message);            PBEParameterSpec pbeparameterspec = new PBEParameterSpec(_fldint,19);            PBEKeySpec pbekeyspec = new PBEKeySpec(Key.toCharArray());            SecretKeyFactory secretkeyfactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");            javax.crypto.SecretKey secretkey = secretkeyfactory.generateSecret(pbekeyspec);            Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");            cipher.init(type, secretkey, pbeparameterspec);            byte[] retByte = cipher.doFinal(bytesrc);             if (type==1)            return new BASE64Encoder().encode(retByte);            else            return new String(retByte,"UTF8");               }    //09会员密码 db.properties 加解密    public static String decrypt(String message,int type) throws Exception {               String keye = "hi%$so78"; //MD5            String keyb = "12up56^&"; //IvParameterSpec            byte bytesrc[];             if (type==1)            bytesrc =message.getBytes();            else            bytesrc =(new BASE64Decoder()).decodeBuffer(message);            MessageDigest md5 = MessageDigest.getInstance("MD5");            md5.update(keye.getBytes());            DESKeySpec desKeySpec = new DESKeySpec(md5.digest());             SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");                  SecretKey secretKey = keyFactory.generateSecret(desKeySpec);               IvParameterSpec iv  = new IvParameterSpec(keyb.getBytes("UTF-8"));            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");              cipher.init(type, secretKey, iv);                     byte[] retByte = cipher.doFinal(bytesrc);             if (type==1)            return new BASE64Encoder().encode(retByte);            else            return new String(retByte);    }             public static void main(String args[]) throws Exception         {            System.out.println( "\n姓名身份证加密:这是一个测试 -> " +Rcode("这是一个测试",1));            System.out.println( "姓名身份证解密:09IdjpQQAPgniEaO/skp9gy8+LkD42fZ -> " +Rcode("09IdjpQQAPgniEaO/skp9gy8+LkD42fZ",2)+"\n");            System.out.println( "09会员密码加解:123456 -> " +decrypt("123456",1));            System.out.println( "09会员密码解密:OEnU8DEcgsE= -> " +decrypt("OEnU8DEcgsE=",2));            System.exit(0);        }}