TEAMModelOS/TEAMModelOS.Extension/IES.Exam/IES.ExamServer/Helpers/AESHelper.cs

using IES.ExamServer.Helper;
using System;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;

namespace IES.ExamServer.Helpers
{
    public class AESHelper
    {
        private static readonly byte[] Key = Encoding.UTF8.GetBytes(Constant._MusicAIServerAESKey);
        private static readonly byte[] IV = Encoding.UTF8.GetBytes(Constant._MusicAIServerAESIv);

        // 解密方法
        public static string Decrypt(string encryptedText)
        {
            Console.WriteLine("解密前的内容：", encryptedText);
            if (string.IsNullOrEmpty(encryptedText))
            {
                return encryptedText;
            }

            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;
                aesAlg.Mode = CipherMode.CBC;
                aesAlg.Padding = PaddingMode.PKCS7;

                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

                byte[] encryptedBytes = Convert.FromBase64String(encryptedText);
                byte[] decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);

                string decryptedText = Encoding.UTF8.GetString(decryptedBytes);
                Console.WriteLine("解密后的内容：", decryptedText);

                if (decryptedText.StartsWith("{"))
                {
                    return JsonSerializer.Serialize(JsonSerializer.Deserialize<object>(decryptedText));
                }
                else
                {
                    return decryptedText;
                }
            }
        }

        // 加密方法
        public static string Encrypt(string plainText)
        {
            Console.WriteLine("加密前的内容：", plainText);
            if (string.IsNullOrEmpty(plainText))
            {
                return plainText;
            }

            using (Aes aesAlg = Aes.Create())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;
                aesAlg.Mode = CipherMode.CBC;
                aesAlg.Padding = PaddingMode.PKCS7;

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

                byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
                byte[] encryptedBytes = encryptor.TransformFinalBlock(plainTextBytes, 0, plainTextBytes.Length);

                string encryptedText = Convert.ToBase64String(encryptedBytes);
                Console.WriteLine("加密后的内容：", encryptedText);
                return encryptedText;
            }
        }
    }
}