using System;
using System.Data;
using System.Text;
using System.Security.Cryptography;
using Microsoft.Extensions.Caching.Memory;
using System.IO;

namespace Common
{
    public class Dbconn
    {        
        public static void InsertCache(string key, object val)
        {
            new MemoryCache(new MemoryCacheOptions()).Set(key, val, new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromMinutes(10)));
        }

        public static void InsertCache(string key, object val, int minutes)
        {
            new MemoryCache(new MemoryCacheOptions()).Set(key, val, new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromMinutes(minutes)));
        }

        public static void InsertCache(string key, object val, DateTime endtime)
        {
            new MemoryCache(new MemoryCacheOptions()).Set(key, val);
        }

        /// <summary>
        /// des解密
        /// </summary>
        /// <param name="content"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string DesDecrypt(string content, string key = "yun1mu23")
        {
            try
            {
                content = content.Replace(" ", "+");
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = Convert.FromBase64String(content);
                des.Key = ASCIIEncoding.ASCII.GetBytes(key);
                des.IV = ASCIIEncoding.ASCII.GetBytes(key);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return System.Text.Encoding.Default.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                Utils.WriteLog(DateTime.Now.ToString() + "\r\n" + content + "\r\n" + ex.ToString(), "des解密异常");
                return "{}";
            }
        }

        public static string DesEncrypt(string content, string key = "yun1mu23")
        {
            try
            {
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = System.Text.Encoding.Default.GetBytes(content);
                des.Key = ASCIIEncoding.ASCII.GetBytes(key);
                des.IV = ASCIIEncoding.ASCII.GetBytes(key);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                Utils.WriteLog(DateTime.Now.ToString() + "\r\n" + content + "\r\n" + ex.ToString(), "des加密异常");
                return "{}";
            }
        }

        public static string Encrypt3DES(string a_strString, string Key3des = "yun1mu23")
        {
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            DES.Key = Encoding.UTF8.GetBytes(Key3des);
            DES.Mode = CipherMode.ECB;
            DES.Padding = PaddingMode.PKCS7;
            ICryptoTransform DESEncrypt = DES.CreateEncryptor();
            byte[] Buffer = Encoding.UTF8.GetBytes(a_strString);
            return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
        }

        public static string Decrypt3DES(string a_strString, string Key3des = "yun1mu23")
        {
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            DES.Key = Encoding.UTF8.GetBytes(Key3des);
            DES.Mode = CipherMode.ECB;
            DES.Padding = PaddingMode.Zeros;
            ICryptoTransform DESDecrypt = DES.CreateDecryptor();
            byte[] Buffer = Convert.FromBase64String(a_strString);
            return UTF8Encoding.UTF8.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
        }


        public static string AesEncrypt(string str, string key, string iv)
        {
            if (string.IsNullOrEmpty(str)) return null;
            Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);

            RijndaelManaged rm = new RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                IV = Encoding.UTF8.GetBytes(iv),
                Mode = CipherMode.CBC,
                Padding = PaddingMode.PKCS7
            };
            ICryptoTransform cTransform = rm.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        public static string AesDecrypt(string str, string key, string iv, string mode = "CBC", string padding = "PKCS7")
        {
            if (string.IsNullOrEmpty(str)) return null;
            Byte[] toEncryptArray = Convert.FromBase64String(str);

            CipherMode cipherMode = CipherMode.CBC;
            PaddingMode paddingMode = PaddingMode.PKCS7;
            if(mode == "CBC") cipherMode = CipherMode.CBC;
            if(mode == "ECB") cipherMode = CipherMode.ECB;
            if(mode == "CFB") cipherMode = CipherMode.CFB;
            if(mode == "CTS") cipherMode = CipherMode.CTS;
            if(padding == "PKCS7") paddingMode = PaddingMode.PKCS7;
            if(padding == "None") paddingMode = PaddingMode.None;
            if(padding == "Zeros") paddingMode = PaddingMode.Zeros;
            if(padding == "ISO10126") paddingMode = PaddingMode.ISO10126;
            if(padding == "ANSIX923") paddingMode = PaddingMode.ANSIX923;

            RijndaelManaged rm = new RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                IV = Encoding.UTF8.GetBytes(iv),
                Mode = cipherMode,
                Padding = paddingMode
            };

            ICryptoTransform cTransform = rm.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Encoding.UTF8.GetString(resultArray);
        }
    }
}