文件解密后无法解压

Question

我正在压缩然后加密一个文件。这没问题。当我尝试解密文件时出现问题，最后，我尝试解压缩解密的文件。在那一刻，我在 ReadEndOfCentralDirectory 中得到一个例外：（更新）

Offset to Central Directory cannot be held in an Int64.
en System.IO.Compression.ZipArchive.ReadEndOfCentralDirectory()
en System.IO.Compression.ZipArchive.Init(Stream stream, ZipArchiveMode mode, Boolean leaveOpen)
en System.IO.Compression.ZipArchive..ctor(Stream stream, ZipArchiveMode mode, Boolean leaveOpen, Encoding entryNameEncoding)
en System.IO.Compression.ZipFile.Open(String archiveFileName, ZipArchiveMode mode, Encoding entryNameEncoding)
en System.IO.Compression.ZipFile.ExtractToDirectory(String sourceArchiveFileName, String destinationDirectoryName, Encoding entryNameEncoding)
en System.IO.Compression.ZipFile.ExtractToDirectory(String sourceArchiveFileName, String destinationDirectoryName)`

为了压缩我正在使用的文件夹

 ZipFile.CreateFromDirectory(sourcePath, pathZipFile, CompressionLevel.Fastest, false);

用于加密：

            RijndaelManaged key = new RijndaelManaged();

            key.KeySize = 256;
            key.BlockSize = 256;
            key.Padding = System.Security.Cryptography.PaddingMode.ISO10126;
            key.Key = Convert.FromBase64String(aes);
            key.IV = Convert.FromBase64String(aes);

            ICryptoTransform encryptor = key.CreateEncryptor();
            using (FileStream InputFile = new FileStream(sourcePath, FileMode.Open, FileAccess.Read))
            using (FileStream OutputFile = new FileStream(targetPath, FileMode.Create, FileAccess.Write))
            {
                using (CryptoStream csEncrypt = new CryptoStream(OutputFile, encryptor, CryptoStreamMode.Write))
                {

                    long total = InputFile.Length;
                    var buffer = new byte[total];
                    var read = InputFile.Read(buffer, 0, buffer.Length);
                    csEncrypt.Write(buffer, 0, read);
                }
            }

解密：

            RijndaelManaged key = new RijndaelManaged();

            key.KeySize = 256;
            key.BlockSize = 256;
            key.Padding = System.Security.Cryptography.PaddingMode.ISO10126;
            key.Key = Convert.FromBase64String(aes);
            key.IV = Convert.FromBase64String(aes);
            ICryptoTransform cryptor = key.CreateDecryptor();
            using (FileStream InputFile = new FileStream(sourcePath, FileMode.Open, FileAccess.Read))
            {
                CryptoStream csEncrypt = new CryptoStream(InputFile, cryptor, CryptoStreamMode.Read);
                StreamWriter fsDecrypted = new StreamWriter(targetPath);
                fsDecrypted.Write(new StreamReader(csEncrypt).ReadToEnd());
                fsDecrypted.Close();
            }

解压：

ZipFile.ExtractToDirectory(zipPath, extractPath);

如果我改变整个过程，首先我加密文件，然后压缩它，我可以解压它，最后解密它没有问题。可能是 encryption/decryption 阶段的问题（可能与编码、字节或类似...有关）？提前致谢。

Answer 1

StreamWriter 您正在写文字。你应该写字节。转换不是无损的。使用 FileStream.

文件解密后无法解压

Unable to decompress file after decrypt it

c#

encryption

unzip

.net-4.5.2