AES加解密（C#和JAVA互通）

对接接口中遇到一个棘手的问题：甲方使用java开发，通过AES加密数据，我方使用C#开发，Java的代码和C#的代码无法互通。

 1         /// <summary>
 2         /// AES加密（128位，密码模式ECB，填充类型PKCS5Padding或者PKCS7Padding。注：ECB模式不需要初始化向量iv。）
 3         /// </summary>
 4         /// <param name="str"></param>
 5         /// <param name="key"></param>
 6         /// <returns></returns>
 7         public static string AES_Encrypt(string str, string key)
 8         {
 9             if (string.IsNullOrEmpty(str)) return null;
10             Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);
11 
12             RijndaelManaged rm = new RijndaelManaged
13             {
14                 Key = Convert.FromBase64String(key),
15                 Mode = CipherMode.ECB,
16                 Padding = PaddingMode.PKCS7
17             };
18 
19             ICryptoTransform cTransform = rm.CreateEncryptor();
20             Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
21             StringBuilder ret = new StringBuilder();
22             foreach (byte b in resultArray.ToArray())
23             {
24                 ret.AppendFormat("{0:X2}", b);
25             }
26             return Convert.ToBase64String(resultArray, 0, resultArray.Length);
27         }

 1         /// <summary>
 2         /// AES解密（128位，密码模式ECB，填充类型PKCS5Padding或者PKCS7Padding。注：ECB模式不需要初始化向量iv。）
 3         /// </summary>
 4         /// <param name="toDecrypt"></param>
 5         /// <param name="key"></param>
 6         /// <returns></returns>
 7         public static string AES_Decrypt(string toDecrypt, string key)
 8         {
 9             byte[] keyArray = Convert.FromBase64String(key); //将TestGenAESByteKey类输出的字符串转为byte数组
10             byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
11             RijndaelManaged rDel = new RijndaelManaged();
12             rDel.Key = keyArray;
13             rDel.Mode = CipherMode.ECB;        //必须设置为ECB
14             rDel.Padding = PaddingMode.PKCS7;  //必须设置为PKCS7
15             ICryptoTransform cTransform = rDel.CreateDecryptor();
16             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
17             return UTF8Encoding.UTF8.GetString(resultArray);
18 
19         }