using System;
using System.Security.Cryptography;
using System.Text;
namespace ConsoleDemo
{
    public class EncryptDes
    {
     
     /**
      * aStrString   加密内容
      * aStrKey      加密秘钥
      */
    public static String Encrypt3Des(String aStrString, String aStrKey, CipherMode mode = CipherMode.ECB, String iv = "12345678")
        {
            
                
            try
            {
                var des = new TripleDESCryptoServiceProvider
                {
                    Key = Encoding.UTF8.GetBytes(aStrKey),
                    Mode = mode
                };
                if (mode == CipherMode.CBC)
                {
                    des.IV = Encoding.UTF8.GetBytes(iv);
                }
                var desEncrypt = des.CreateEncryptor();
                byte[] buffer = Encoding.UTF8.GetBytes(aStrString);
                return Convert.ToBase64String(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));
            }
            catch (Exception e)
            {
                return string.Empty;
            }
        }
        public static string Decrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")
        {
            try
            {
                var des = new TripleDESCryptoServiceProvider
                {
                    Key = Encoding.UTF8.GetBytes(aStrKey),
                    Mode = mode,
                    Padding = PaddingMode.PKCS7
                };
                if (mode == CipherMode.CBC)
                {
                    des.IV = Encoding.UTF8.GetBytes(iv);
                }
                var desDecrypt = des.CreateDecryptor();
                var result = "";
                byte[] buffer = Convert.FromBase64String(aStrString);
                result = Encoding.UTF8.GetString(desDecrypt.TransformFinalBlock(buffer, 0, buffer.Length));
                return result;
            }
            catch (Exception e)
            {
                return string.Empty;
            }
        }
       
    
    }
}