C#des加密算法指定鍵的大小對於此算法無效
阿新 • • 發佈:2018-01-22
adding str sub man 指定 bst coder created instance
api接口調用的時候,需要和java的進行加密通信,通信過程中用到DES加密,java那邊DES的key為64位字符串,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:因為要網絡傳輸,把+號全部轉為%2B
private static final String KEY ="xxxJE234D";//64個字符串 public static String encryptString(String plaintext) throwsException{ 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(); //實例化加/解密類對象 descsp.Mode = CipherMode.CBC; descsp.Padding = PaddingMode.PKCS7; byte[] key = Encoding.UTF8.GetBytes(encryptKey); //定義字節數組,用來存儲密鑰 byte[] data = Encoding.UTF8.GetBytes(str);//定義字節數組,用來存儲要加密的字符串 MemoryStream MStream = new MemoryStream(); //實例化內存流對象 //使用內存流實例化加密流對象 CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write); CStream.Write(data, 0, data.Length); //向加密流中寫入數據 CStream.FlushFinalBlock(); //釋放加密流 return Convert.ToBase64String(MStream.ToArray()).Replace("+", "%2B");//返回加密後的字符串 }
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>已解密的字符串</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加密算法指定鍵的大小對於此算法無效