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

namespace PoXiao
{
    internal class TextEncryptUtils
    {
        public static string AesEncrypt(string str, string key)//aes加密
        {
            if (string.IsNullOrEmpty(str)) return null;
            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);
        }

        public static string AesDecrypt(string str, string key)//aes解密
        {
            if (string.IsNullOrEmpty(str)) return null;
            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);
        }

        public static string Md532(string str)
        {
            var md5Csp = new MD5CryptoServiceProvider();
            byte[] md5Source = Encoding.UTF8.GetBytes(str);
            byte[] md5Out = md5Csp.ComputeHash(md5Source);
            string result = "";
            for (int i = 0; i < md5Out.Length; i++)
            {
                result += md5Out[i].ToString("x2");
            }
            return result;
        }
    }
}