using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace JwKdsV.Core.Utils
{
    public static class DesUtils
    {
        //默认密钥向量
        private static byte[] Keys = { 1 , 5 , 6 , 3 ,8 , 5 ,9 , 0 };
        // 密钥
        private static String KEY_STR = "$QBOSSY$";

        public static string Encrypt(string data)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(KEY_STR.Substring(0 , 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(data);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream , dCSP.CreateEncryptor(rgbKey , rgbIV) , CryptoStreamMode.Write);
                cStream.Write(inputByteArray , 0 , inputByteArray.Length);
                cStream.FlushFinalBlock();
                return SafeBase64Utils.ToBase64(mStream.ToArray());
            }
            catch
            {
                return data;
            }
        }

        public static string Decrypt(string data)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(KEY_STR);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(SafeBase64Utils.SafeBase64ToBase64(data));
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream , DCSP.CreateDecryptor(rgbKey , rgbIV) , CryptoStreamMode.Write);
                cStream.Write(inputByteArray , 0 , inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return data;
            }
        }

        /// <summary>
        ///3DES加密
        /// </summary>
        /// <param name="originalValue">加密数据</param>
        /// <param name="key">24位字符的密钥字符串</param>
        /// <param name="IV">8位字符的初始化向量字符串</param>
        /// <returns></returns>
        public static string DES3Encrypt(string originalValue, string key, string IV)
        {

            SymmetricAlgorithm sa;
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;
            sa = new TripleDESCryptoServiceProvider();
            sa.Key = Encoding.UTF8.GetBytes(key);
            sa.IV = Encoding.UTF8.GetBytes(IV);
            ct = sa.CreateEncryptor();
            byt = Encoding.UTF8.GetBytes(originalValue);
            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();
            return Convert.ToBase64String(ms.ToArray());
        }

        /// <summary>
        /// 3DES解密
        /// </summary>
        /// <param name="data">解密数据</param>
        /// <param name="key">24位字符的密钥字符串(需要和加密时相同)</param>
        /// <param name="iv">8位字符的初始化向量字符串(需要和加密时相同)</param>
        /// <returns></returns>
        public static string DES3Decrypst(string data, string key, string IV)
        {
            SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
            mCSP.Key = Encoding.UTF8.GetBytes(key);
            mCSP.IV = Encoding.UTF8.GetBytes(IV);
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;
            ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);
            byt = Convert.FromBase64String(data);
            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();
            return Encoding.UTF8.GetString(ms.ToArray());

        }


    }
}