using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace LB_SmartVisionCommon
{
    /// <summary>
    /// AES加密/解密
    /// </summary>
    public class AESHelper
    {
        private static readonly byte[] Key = Encoding.UTF8.GetBytes("SHANGHAILANBAOSHANGHAILANBAO1234"); // 32字节
        private static readonly byte[] IV = Encoding.UTF8.GetBytes("LANBAO1234567890"); // 16字节
        /// <summary>
        /// AES加密
        /// </summary>
        /// <param name="plainText">待加密文字</param>
        /// <returns>加密后文字</returns>
        public static string Encrypt(string plainText)
        {
            using (Aes aes = Aes.Create())
            {
                aes.Key = Key;
                aes.IV = IV;
                ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
                using (MemoryStream ms = new MemoryStream())
                using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter sw = new StreamWriter(cs))
                    {
                        sw.Write(plainText);
                    }
                    return Convert.ToBase64String(ms.ToArray());
                }
            }
        }

        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="cipherText">待解密文字</param>
        /// <returns>解密后文字</returns>
        public static string Decrypt(string cipherText)
        {
            using (Aes aes = Aes.Create())
            {
                aes.Key = Key;
                aes.IV = IV;
                ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
                using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(cipherText)))
                using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
                using (StreamReader sr = new StreamReader(cs))
                {
                    return sr.ReadToEnd();
                }
            }
        }
    }
}