/// <summary> /// 加密请求参数 /// 加密规则如下: /// 1. AES128/CBC/PKCS7Padding 加密 /// 2. 对AES加密数据进行一次base64编码 /// iv 向量必须是16位。如果为空字符串则取秘钥key的值 /// </summary> /// <returns>加密后的数据(base64编码)</returns> private static string EncryptReqData(string value, string key, string iv = "") { if (string.IsNullOrEmpty(value)) return string.Empty; if (key == null) throw new Exception("未将对象引用设置到对象的实例。"); if (key.Length < 16) throw new Exception("指定的密钥长度不能少于16位。"); if (key.Length > 32) throw new Exception("指定的密钥长度不能多于32位。"); if (key.Length != 16 && key.Length != 24 && key.Length != 32) throw new Exception("指定的密钥长度不明确。"); if (!string.IsNullOrEmpty(iv)) { if (iv.Length < 16) throw new Exception("指定的向量长度不能少于16位。"); } var _keyByte = Encoding.UTF8.GetBytes(key); var _valueByte = Encoding.UTF8.GetBytes(value); using (var aes = new RijndaelManaged()) { aes.IV = !string.IsNullOrEmpty(iv) ? Encoding.UTF8.GetBytes(iv) : Encoding.UTF8.GetBytes(key.Substring(0, 16)); aes.Key = _keyByte; aes.Mode = CipherMode.CBC; aes.Padding = PaddingMode.PKCS7; var cryptoTransform = aes.CreateEncryptor(); var resultArray = cryptoTransform.TransformFinalBlock(_valueByte, 0, _valueByte.Length); return Convert.ToBase64String(resultArray, 0, resultArray.Length); } } /// <summary> /// AES解密 /// </summary> /// <param name="value"></param> /// <param name="key"></param> /// <param name="iv"></param> /// <returns></returns> private static string AesDecrypt(string value, string key, string iv = "") { if (string.IsNullOrEmpty(value)) return string.Empty; if (key == null) throw new Exception("未将对象引用设置到对象的实例。"); if (key.Length < 16) throw new Exception("指定的密钥长度不能少于16位。"); if (key.Length > 32) throw new Exception("指定的密钥长度不能多于32位。"); if (key.Length != 16 && key.Length != 24 && key.Length != 32) throw new Exception("指定的密钥长度不明确。"); if (!string.IsNullOrEmpty(iv)) { if (iv.Length < 16) throw new Exception("指定的向量长度不能少于16位。"); } var _keyByte = Encoding.UTF8.GetBytes(key); var _valueByte = Convert.FromBase64String(value); using (var aes = new RijndaelManaged()) { aes.IV = !string.IsNullOrEmpty(iv) ? Encoding.UTF8.GetBytes(iv) : Encoding.UTF8.GetBytes(key.Substring(0, 16)); aes.Key = _keyByte; aes.Mode = CipherMode.CBC; aes.Padding = PaddingMode.PKCS7; var cryptoTransform = aes.CreateDecryptor(); var resultArray = cryptoTransform.TransformFinalBlock(_valueByte, 0, _valueByte.Length); return Encoding.UTF8.GetString(resultArray); } }