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

namespace DG.Tool
{
    public static class SecurityHelper
    {
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="ciphertext"></param>
        /// <param name="accessKey"></param>
        /// <returns></returns>
        public static string EncyptData(string ciphertext, string accessKey)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] iv = { 0x75, 0x70, 0x63, 0x68, 0x69, 0x6e, 0x61, 0x31 };
            ICryptoTransform encryptor = des.CreateEncryptor(key, iv);
            byte[] data = utf.GetBytes(ciphertext);
            byte[] encData = encryptor.TransformFinalBlock(data, 0, data.Length);
            return Convert.ToBase64String(encData);
        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="cryptograph"></param>
        /// <param name="accessKey"></param>
        /// <returns></returns>
        public static string DecyptData(string cryptograph, string accessKey)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] iv = { 0x75, 0x70, 0x63, 0x68, 0x69, 0x6e, 0x61, 0x31 };
            ICryptoTransform decryptor = des.CreateDecryptor(key, iv);
            byte[] encData = Convert.FromBase64String(cryptograph);
            byte[] data = decryptor.TransformFinalBlock(encData, 0, encData.Length);
            return utf.GetString(data);
        }

        public static string SignData(string ciphertext, string accessKey)
        {
            Encoding utf = new UTF8Encoding();
            HMACMD5 hmac = new HMACMD5(utf.GetBytes(accessKey));
            byte[] hashValue = hmac.ComputeHash(utf.GetBytes(ciphertext));
            return Convert.ToBase64String(hashValue);
        }

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="ciphertext"></param>
        /// <param name="accessKey"></param>
        /// <param name="iv"></param>
        /// <returns></returns>
        public static string EncyptDataNew(string ciphertext, string accessKey, string iv)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] ivbt = utf.GetBytes(iv);
            ICryptoTransform encryptor = des.CreateEncryptor(key, ivbt);
            byte[] data = utf.GetBytes(ciphertext);
            byte[] encData = encryptor.TransformFinalBlock(data, 0, data.Length);
            return Convert.ToBase64String(encData);
        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="cryptograph"></param>
        /// <param name="accessKey"></param>
        /// <param name="iv"></param>
        /// <returns></returns>
        public static string DecyptDataNew(string cryptograph, string accessKey, string iv)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] ivbt = utf.GetBytes(iv);
            ICryptoTransform decryptor = des.CreateDecryptor(key, ivbt);
            byte[] encData = Convert.FromBase64String(cryptograph);
            byte[] data = decryptor.TransformFinalBlock(encData, 0, encData.Length);
            return utf.GetString(data);
        }

        public static string CreateSignEncodingStr(string json, string clientid, string accessKey)
        {
            if (string.IsNullOrWhiteSpace(clientid))
            {
                clientid = "UPWEBSITE";
            }
            string key = "content={0}&clientid=" + clientid + "&sign={1}";
            string jiami = EncyptData(json, accessKey);
            string jiami1 = HttpUtility.UrlEncode(jiami, Encoding.UTF8);
            string jiasuo = SignData(jiami, accessKey);
            string jiasuo1 = HttpUtility.UrlEncode(jiasuo, Encoding.UTF8);
            key = string.Format(key, jiami1, jiasuo1);
            return key;
        }

        public static object CreateSignEncodingJsonStr(string json, string clientid, string accessKey)
        {
            //if (string.IsNullOrWhiteSpace(clientid))
            //{
            //    clientid = "UPWEBSITE";
            //}
            //string key = "content={0}&clientid=" + clientid + "&sign={1}";
            //string jiami = EncyptData(json, accessKey);
            //string jiami1 = HttpUtility.UrlEncode(jiami, Encoding.UTF8);
            //string jiasuo = SignData(jiami, accessKey);
            //string jiasuo1 = HttpUtility.UrlEncode(jiasuo, Encoding.UTF8);
            //key = string.Format(key, jiami1, jiasuo1);
            //return key;

            if (string.IsNullOrWhiteSpace(clientid))
            {
                clientid = "UPWEBSITE";
            }
            string content = EncyptData(json, accessKey);
            string sign = SignData(content, accessKey);
            var maxjson = new
            {
                content = content,
                clientId = clientid,
                sign = sign
            };
            return maxjson;
        }
    }
}