Detailed example of des encryption and decryption between Java and asp.net

Recently there is a new project made in Java. The old project is asp.net. The interface transmission requires DES encryption and decryption. I checked some information online and found that most of them cannot be used immediately. I debugged and processed it myself. The specific code As follows:

The key must be 8 digits

        /// <summary>   
        /// 利用DES加密算法加密字符串（可解密）   
        /// </summary>   
        /// <param name="pToEncrypt">被加密的字符串</param>   
        /// <param name="key">密钥（只支持8个字节的密钥）</param>   
        /// <returns>加密后的字符串</returns>   
        public static string DESEnCode(string pToEncrypt, string key)
        {
            try
            {
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(pToEncrypt);
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
                stream2.Write(bytes, 0, bytes.Length);
                stream2.FlushFinalBlock();
                StringBuilder builder = new StringBuilder();
                foreach (byte num in stream.ToArray())
                {
                    builder.AppendFormat("{0:X2}", num);
                }
                stream.Close();
                return builder.ToString();
            }
            catch (Exception) { return "xxxx"; }
        }
         /// <summary>   
        /// 解密  
        /// </summary>   
        /// <param name="plaintext">加密后的字符串</param>   
        /// <param name="key">密钥（只支持8个字节的密钥）</param>   
        /// <returns>解密后的字符串</returns>   
        public static string Decode(string str, string key, string encLangue)
        {
            try
            {
                //str=Ruijie.Pcfg.Utils.DESEncrypt.HexTostring(str);
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                byte[] buffer = new byte[str.Length / 2];
                for (int i = 0; i < (str.Length / 2); i++)
                {
                    int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
                    buffer[i] = (byte)num2;
                }
                
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
                stream2.Write(buffer, 0, buffer.Length);
                stream2.FlushFinalBlock();
                stream.Close();
                if (encLangue == "java")
                {
                    return Encoding.GetEncoding("utf-8").GetString(stream.ToArray());
                }
                else
                {
                    return Encoding.GetEncoding("gb2312").GetString(stream.ToArray());
                }
                
            }
            catch (Exception) { return ""; }
        }

The corresponding java method is as follows:

package com.testspring;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
public class DesHelper {
/**
    * 加密
    *
    *
    * **/
   public String encrypt(String message,String key)
   {
       return toHexString(encryptByte(message,key)).toUpperCase();
   }
   /**
    * 明文加密后的数组
    *
    *
    * **/
   public byte[] encryptByte(String message, String key) {
       byte[] s={};
       try
       {
           Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
           DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
           SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
           SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
           IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
           cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
           return cipher.doFinal(message.getBytes("UTF-8"));
       }
       catch (Exception ex) {
}
       return s;
   }
   /**
    * 数组转化成16进制
    *
    *
    * **/
   public static String toHexString(byte b[]) {
       StringBuffer hexString = new StringBuffer();
       for (int i = 0; i < b.length; i++) {
           String plainText = Integer.toHexString(0xff & b[i]);
           if (plainText.length() < 2)
               plainText = "0" + plainText;
           hexString.append(plainText);
       }
       return hexString.toString();
   }
   /**
    * 解密
    *ciphertext 加密字符串，key 密钥，encLangue 加密语言
    *
    * **/
   public String decrypt(String ciphertext, String key,String encLangue) {
       try {
           byte[] bytesrc = convertHexString(ciphertext);
           Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
           DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
           SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
           SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
           IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
           cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
           byte[] retByte = cipher.doFinal(bytesrc);
           if(encLangue=="java")
           {
               return new String(retByte,"utf-8");
           }
           else
           {
               return new String(retByte);
           }
       }
       catch (Exception ex)
       {
}
       return "";
   }
   /**
    * 转化16进制字符串为byte数组
    *
    * **/
   public static byte[] convertHexString(String ss) {
       byte digest[] = new byte[ss.length() / 2];
       for (int i = 0; i < digest.length; i++) {
           String byteString = ss.substring(2 * i, 2 * i + 2);
           int byteValue = Integer.parseInt(byteString, 16);
           digest[i] = (byte) byteValue;
       }
       return digest;
   }
}

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