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

namespace TradeManageNew
{
    public static class EncryptionHelp
    {
        public static string EncryptString(string plainText, string key)
        {
            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Encoding.UTF8.GetBytes(key);
                aesAlg.IV = new byte[16]; // 使用默认IV

                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

                byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);

                byte[] encryptedBytes;

                using (var msEncrypt = new System.IO.MemoryStream())
                {
                    using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        csEncrypt.Write(plainBytes, 0, plainBytes.Length);
                        csEncrypt.FlushFinalBlock();
                        encryptedBytes = msEncrypt.ToArray();
                    }
                }

                return Convert.ToBase64String(encryptedBytes);
            }
        }

        public static string GetMD5(string input)
        {
            // 将输入字符串转换为字节数组
            byte[] inputBytes = Encoding.UTF8.GetBytes(input);

            // 创建一个MD5实例
            MD5 md5 = MD5.Create();

            // 计算输入数据的MD5哈希值
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            // 将计算得到的哈希值转换为字符串表示
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hashBytes.Length; i++)
            {
                sb.Append(hashBytes[i].ToString("x2"));
            }

            return sb.ToString();
        }
    }
}