C#des密碼編譯演算法指定鍵的大小對於此演算法無效

標籤：演算法   inpu   ext   col   decrypt   ade   close   private   oar   

api介面調用的時候，需要和java的進行加密通訊，通訊過程中用到DES加密，java那邊DES的key為64位字串，而之前c#的DES加密是key為8位

DESCryptoServiceProvider 中的密鑰是8位；
RijndaelManaged 中的密鑰是32位。

java中的的DES/CBC/PKCS5Padding對應c#中的DES/CBC/PKCS7

對應的javaDES加密函數：因為要網路傳輸，把+號全部轉為%2B

    private static final String KEY ="xxxJE234D";//64個字串    public static String encryptString(String plaintext) throws Exception{        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.substring(0, 8).getBytes("UTF-8"));        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);        byte[] bt = cipher.doFinal(plaintext.getBytes("UTF-8"));        String strs = new BASE64Encoder().encode(bt).replaceAll("[+]", "%2B");        return strs;    }

c#對應的DES加密函數：

    public static string ToEncrypt2(string str, string myKey)        {            string encryptKeyall = Convert.ToString(myKey);    //定義密鑰              if (encryptKeyall.Length < 9)            {                for (; ; )                {                    if (encryptKeyall.Length < 9)                        encryptKeyall += encryptKeyall;                    else                        break;                }            }            string encryptKey = encryptKeyall.Substring(0, 8);            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //執行個體化加/解密類對象               descsp.Mode = CipherMode.CBC;            descsp.Padding = PaddingMode.PKCS7;            byte[] key = Encoding.UTF8.GetBytes(encryptKey); //定義位元組數組，用來儲存體金鑰                byte[] data = Encoding.UTF8.GetBytes(str);//定義位元組數組，用來儲存要加密的字串              MemoryStream MStream = new MemoryStream(); //執行個體化記憶體流對象                  //使用記憶體流執行個體化加密流對象               CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);            CStream.Write(data, 0, data.Length);  //向加密流中寫入資料                  CStream.FlushFinalBlock();              //釋放加密流                  return Convert.ToBase64String(MStream.ToArray()).Replace("+", "%2B");//返回加密後的字串          }

c#中key為8位的情況:

  public static string Encrypt(string pToEncrypt, string sKey)        {            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())            {                byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);                System.IO.MemoryStream ms = new System.IO.MemoryStream();                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))                {                    cs.Write(inputByteArray, 0, inputByteArray.Length);                    cs.FlushFinalBlock();                    cs.Close();                }                string str = Convert.ToBase64String(ms.ToArray());                ms.Close();                return str;            }        }//解密    /// <summary>        /// 進行DES解密        /// </summary>        /// <param name="pToDecrypt">要解密的以Base64</param>        /// <param name="sKey">密鑰，且必須為8位</param>        /// <returns>已解密的字串</returns>        public static string Decrypt(string pToDecrypt, string sKey)        {            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())            {                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);                System.IO.MemoryStream ms = new System.IO.MemoryStream();                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))                {                    cs.Write(inputByteArray, 0, inputByteArray.Length);                    cs.FlushFinalBlock();                    cs.Close();                }                string str = Encoding.UTF8.GetString(ms.ToArray());                ms.Close();                return str;            }        }

 

C#des密碼編譯演算法指定鍵的大小對於此演算法無效