c# 大文件rsa aes 混合加密

       private static void Main(string[] args)
        {
            var keyList = RsaKeyGenerator.Pkcs1Key(2048, true);
            var privateKey = keyList[0];
            var publicKey = keyList[1];
            var filePath = "C:\\Users\\admin\\Downloads\\1.zip";

            EncryptFile(filePath,"tttt",publicKey);
            DecryptFile("tttt","",publicKey,privateKey);




            Environment.Exit(0);
        }
        private static byte[] GetByteArray(int byteSize)
        {
            Random rnd = new Random();
            byte[] b = new byte[byteSize]; 
            rnd.NextBytes(b);
            return b;
        }
        public static void EncryptFile(string filePath, string encryptFilePath, string publicKey)
        {
            var obj = new Class1();
            obj.AESKey = GetByteArray(32);
            obj.AESIV = GetByteArray(16);
            obj.FileName = Path.GetFileName(filePath);
            var transform = Aes.Create().CreateEncryptor(obj.AESKey, obj.AESIV);
            RsaPkcs1Util util = new RsaPkcs1Util(Encoding.UTF8, publicKey);
            EncryptObject(obj, util);
            var res = MessagePackSerializer.Serialize(obj);
            var outFs = new FileStream(encryptFilePath, FileMode.OpenOrCreate);
            outFs.Write(res, 0, res.Length);
            var outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write);
            var inFs = new FileStream(filePath, FileMode.Open);
            var blockSizeBytes = 128 / 8;
            var data = new byte[blockSizeBytes];
            while (inFs.Read(data, 0, blockSizeBytes) is int count && count > 0)
                outStreamEncrypted.Write(data, 0, count);
            outStreamEncrypted.FlushFinalBlock();
            inFs.Dispose();
            outFs.Dispose();
        }
        public static void DecryptFile(string filePath, string decryptFileDirectory, string publicKey,string privateKey)
        {
            var inFs = new FileStream(filePath, FileMode.Open);
            var streamReader = new MessagePackStreamReader(inFs);
            var msg = streamReader.ReadAsync(default).GetAwaiter().GetResult();
            if (msg is null) return;
            var headerLength = msg.Value.Length;
            var obj = MessagePackSerializer.Deserialize<Class1>((ReadOnlySequence<byte>)msg);
            streamReader.Dispose();
            inFs.Dispose();
            RsaPkcs1Util util = new RsaPkcs1Util(Encoding.UTF8, publicKey,privateKey);
            DecryptObject(obj,util);
            var transform = Aes.Create().CreateDecryptor(obj.AESKey, obj.AESIV);
            inFs = new FileStream(filePath, FileMode.Open);
            inFs.Seek(headerLength, SeekOrigin.Begin);
            var worker = new IdWorker(1, 1);
            var outFilePath = Path.Combine(decryptFileDirectory, obj.FileName);
            while (File.Exists(outFilePath)) 
                outFilePath = Path.Combine(decryptFileDirectory, worker.NextId() + "_" + obj.FileName);

            var outFs = new FileStream(outFilePath, FileMode.Create);
            var blockSizeBytes = 128 / 8;
            var data = new byte[blockSizeBytes];
            
            var outStreamDecrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write);

            while (inFs.Read(data, 0, blockSizeBytes) is int count && count > 0) outStreamDecrypted.Write(data, 0, count);
            outStreamDecrypted.FlushFinalBlock();

            inFs.Dispose();
            outFs.Dispose();
            
        }
        public static void EncryptObject(object obj, RSAUtilBase util)
        {
            var properties = obj.GetType().GetProperties();
            foreach (var property in properties)
            {
                switch (property.PropertyType.Name)
                {
                    case "String":
                        var temp1 = property.GetValue(obj) as string;
                        temp1 = util.Encrypt(temp1, RSAEncryptionPadding.Pkcs1);
                        property.SetValue(obj, temp1);
                        break;
                    case "Byte[]":
                        var temp2 = property.GetValue(obj) as byte[];
                        temp2 = util.PublicRsa.Encrypt(temp2, RSAEncryptionPadding.Pkcs1);
                        property.SetValue(obj, temp2);
                        break;
                }
            }
        }
        public static void DecryptObject(object obj, RSAUtilBase util)
        {
            var properties = obj.GetType().GetProperties();
            foreach (var property in properties)
            {
                switch (property.PropertyType.Name)
                {
                    case "String":
                        var temp1 = property.GetValue(obj) as string;
                        temp1 = util.Decrypt(temp1, RSAEncryptionPadding.Pkcs1);
                        property.SetValue(obj, temp1);
                        break;
                    case "Byte[]":
                        var temp2 = property.GetValue(obj) as byte[];
                        temp2 = util.PrivateRsa.Decrypt(temp2, RSAEncryptionPadding.Pkcs1);
                        property.SetValue(obj, temp2);
                        break;
                }
            }
        }

    [MessagePackObject]
    public class Class1
    {
        [Key(0)] public string FileName { get; set; }
        [Key(1)] public byte[] AESKey { get; set; }
        [Key(2)] public byte[] AESIV { get; set; }
    }