using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Ragdoll
{
    public class EnUtil
    {
        public static string En(string source)
        {
            const string key = "M6MoLC88bDjDE0qtoi4hlXNHfZ2Aa6bS";
            const string IV = "UjLbdUwyqdhp5pGf";
            return AesEncryptedString(source, key, IV);
        }

        public static string AesEncryptedString(string encryptStr, string key, string vector)
        {
            byte[] aesBytes = Encoding.UTF8.GetBytes(encryptStr);

            byte[] aesKey = new byte[32];
            Array.Copy(Encoding.UTF8.GetBytes(key), aesKey, aesKey.Length);
            byte[] aesVector = new byte[16];
            Array.Copy(Encoding.UTF8.GetBytes(vector), aesVector, aesVector.Length);

            Rijndael Aes = Rijndael.Create();
            //或者采用下方生成Aes
            //RijndaelManaged Aes = new();

            // 开辟一块内存流  
            MemoryStream memoryStream = new MemoryStream();
            // 把内存流对象包装成加密流对象  
            CryptoStream cryptoStream = new CryptoStream(memoryStream, Aes.CreateEncryptor(aesKey, aesVector),
                CryptoStreamMode.Write);
            // 明文数据写入加密流  
            cryptoStream.Write(aesBytes, 0, aesBytes.Length);
            cryptoStream.FlushFinalBlock();

            string result = Convert.ToBase64String(memoryStream.ToArray());
            return result;
        }


        public static string Sha256Encrypt(string palinData, string salt = "cxhy")
        {
            if (string.IsNullOrWhiteSpace(palinData)) return null;
            using (SHA256 sha256 = new SHA256CryptoServiceProvider())
            {
                byte[] bytes = Encoding.UTF8.GetBytes(palinData + salt);
                byte[] sha256Bytes = sha256.ComputeHash(bytes);
                return Convert.ToBase64String(sha256Bytes);
            }
        }

        public static string AesAndSha256(string content)
        {
            return Sha256Encrypt(En(content));
        }
    }
}