//引用命名空间 using System.Security.Cryptography; /// <summary> /// AES 加密 /// </summary> /// <param name="str">明文(待加密)</param> /// <param name="key">密文 注意:密文长度有 16,24,32,不能用其它长度的密文</param> /// <returns></returns> public string AesEncrypt(string str, string key) { if (string.IsNullOrEmpty(str)) return null; try { Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str); RijndaelManaged rm = new RijndaelManaged { Key = Encoding.UTF8.GetBytes(key), Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 }; ICryptoTransform cTransform = rm.CreateEncryptor(); Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return Convert.ToBase64String(resultArray); } catch (Exception ex) { string s = ex.Message; return null; } } /// <summary> /// AES 解密 /// </summary> /// <param name="str">明文(待解密)</param> /// <param name="key">密文 注意:密文长度有 16,24,32,不能用其它长度的密文</param> /// <returns></returns> public string AesDecrypt(string str, string key) { if (string.IsNullOrEmpty(str)) return null; try { Byte[] toEncryptArray = Convert.FromBase64String(str); RijndaelManaged rm = new RijndaelManaged { Key = Encoding.UTF8.GetBytes(key), Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 }; ICryptoTransform cTransform = rm.CreateDecryptor(); Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return Encoding.UTF8.GetString(resultArray); } catch (Exception ex) { string s = ex.Message; return null; } }