// NOTE!! In future probably would be best to delete the "RawEncrypt / RawDecrypt"
// methods and use these Stream based alogrithms instead.
public static void Encrypt(this Stream readStream, Stream writeStreamEncryptDest,
byte[] privateKey, bool useDeflateCompression)
{
if (readStream == null)
{
throw new ArgumentNullException(nameof(readStream));
}
if (writeStreamEncryptDest == null)
{
throw new ArgumentNullException(nameof(writeStreamEncryptDest));
}
if (privateKey == null)
{
throw new ArgumentNullException(nameof(privateKey));
}
byte[] initVector = GetIVFromEncryptionKey(privateKey);
if (initVector == null)
{
throw new ArgumentNullException(nameof(initVector));
}
CryptoStream cryptS = null;
DeflateStream compressS = null;
try {
// what, no usings? no Dispose (in finally)?! See notes on Decrypt, STINKING CryptoStream disposes base stream
SymmetricAlgorithm aesAlgorithm = Rijndael.Create();
ICryptoTransform aesEncryptor = aesAlgorithm.CreateEncryptor(privateKey, initVector);
cryptS = new CryptoStream(writeStreamEncryptDest, aesEncryptor, CryptoStreamMode.Write);
{
if (useDeflateCompression)
{
using (compressS = new DeflateStream(cryptS, CompressionMode.Compress, true))
XStream.Write(compressS, readStream);
}
else
{
XStream.Write(cryptS, readStream);
}
}
}
finally {
if (cryptS != null)
{
cryptS.FlushFinalBlock(); //
}
}
}
public static void Decrypt(this Stream readStreamEncrypted, Stream writeStream,
byte[] privateKey, bool useDeflateCompression)
{
if (readStreamEncrypted == null)
{
throw new ArgumentNullException(nameof(readStreamEncrypted));
}
if (writeStream == null)
{
throw new ArgumentNullException(nameof(writeStream));
}
if (privateKey == null)
{
throw new ArgumentNullException(nameof(privateKey));
}
byte[] initVector = GetIVFromEncryptionKey(privateKey);
if (initVector == null)
{
throw new ArgumentNullException(nameof(initVector));
}
try {
SymmetricAlgorithm aesAlgorithm = Rijndael.Create();
ICryptoTransform aesDecryptor = aesAlgorithm.CreateDecryptor(privateKey, initVector);
CryptoStream cryptS;
if (!useDeflateCompression)
{
using (cryptS = new CryptoStream(writeStream, aesDecryptor, CryptoStreamMode.Write))
XStream.Write(cryptS, readStreamEncrypted);
}
else
{
cryptS = new CryptoStream(readStreamEncrypted, aesDecryptor, CryptoStreamMode.Read);
using (DeflateStream deflS = new DeflateStream(cryptS, CompressionMode.Decompress, true))
XStream.Write(writeStream, deflS);
}
}
finally {
// do NOT call flush or flushxyz on CryptoStream, bec here, DeflStrm wraps it
// and already calls it. CryptStrm is AMAZINGLY STUPIDLY designed, breaking ALL
// contracts usually expected, like Flush should not throw errors. OH NO, IT DOES.
// No wonder so many by pass .NET's version with couple open source options. TOTAL EMBARRASSMENT.
}
}
// NEW, later, use these newer stream zip/unzip versions (perhaps)
#region === Streams ===
/// <summary>
/// Compresses and writes the input stream to the output stream using DeflateStream.
/// The input stream is only read from and is not altered as such, but rather, it is the
/// output stream that is written to with a compressed version of the input
/// stream. The input stream will be read from its current position to its end.
/// </summary>
/// <param name="readStream">The input stream which must be readable.</param>
/// <param name="writeStream">The output stream that will contain the
/// compressed data of <i>inputStream</i>. This stream must be writable.</param>
/// <param name="compressionType">The compression type: DeflateStream or GZip.</param>
public static void Compress(this Stream readStream, Stream writeStream, CompressionType compressionType)
{
if (readStream == null)
{
throw new ArgumentNullException("readStream");
}
if (writeStream == null)
{
throw new ArgumentNullException("writeStream");
}
Stream deflS = null;
try
{
// writeStream NOT be closed when its decorator stream (deflS) is Disposed with 'true'
if (compressionType == CompressionType.DeflateStream)
{
deflS = new DeflateStream(writeStream, CompressionMode.Compress, true);
}
else
{
deflS = new GZipStream(writeStream, CompressionMode.Compress, true);
}
XStream.Write(deflS, readStream);
}
finally
{
if (deflS != null)
{
deflS.Flush();
deflS.Dispose(); // This flushes the stream!! Flush() does NOT work.
}
}
/* OLD
* private static void __Zip(this Stream inputStream, Stream outputZippedStream, CompressionType compressionType)
* {
* if (inputStream == null) throw new ArgumentNullException("inputStream");
* if (outputZippedStream == null) throw new ArgumentNullException("outputZippedStream");
*
* Stream deflS;
*
* // we set the output stream to NOT be closed when its decorator stream (deflS) is Disposed with 'true' param
* // note that inputStream is never decorated, so no such action need be taken
* if (compressionType == CompressionType.DeflateStream)
* deflS = new DeflateStream(outputZippedStream, CompressionMode.Compress, true);
* else
* deflS = new GZipStream(outputZippedStream, CompressionMode.Compress, true);
*
* try
* {
* int bufferLen = SetBufferSize(inputStream.Length);
* byte[] buffer = new byte[bufferLen];
* int bytesRead = 0;
*
* do
* {
* bytesRead = inputStream.Read(buffer, 0, bufferLen);
* deflS.Write(buffer, 0, bytesRead);
* } while (bytesRead != 0);
*
* deflS.Dispose(); // This flushes the stream!! Flush() does NOT work.
* }
* finally { if (deflS != null) deflS.Dispose(); }
* }
*/
}
/// <summary>
/// Decompresses and writes the input stream to the output stream using DeflateStream.
/// The input stream is only read from and is not altered as such, but rather, it is the
/// output stream that is written to with a decompressed version of the input
/// stream. The input stream will be read from its current position to its end.
/// </summary>
/// <param name="readStream">The input stream which is expected to contain
/// data that was compressed with DeflateStream or with a compatible compression type.
/// This stream must be readable.</param>
/// <param name="writeStream">The output stream that will contain the
/// decompressed data of <i>inputStream</i>. This stream must be writable.</param>
/// <param name="compressionType">The compression type to use: DeflateStream or GZip.</param>
public static void Decompress(this Stream readStream, Stream writeStream, CompressionType compressionType)
{
if (readStream == null)
{
throw new ArgumentNullException("readStream");
}
if (writeStream == null)
{
throw new ArgumentNullException("writeStream");
}
Stream deflS = null;
try
{
if (compressionType == CompressionType.DeflateStream)
{
deflS = new DeflateStream(readStream, CompressionMode.Decompress, true);
}
else
{
deflS = new GZipStream(readStream, CompressionMode.Decompress, true);
}
XStream.Write(writeStream, deflS);
}
finally
{
if (deflS != null)
{
deflS.Flush();
deflS.Dispose(); // This flushes the stream!! Flush() does NOT work.
}
}
/*
* private static void __Unzip(this Stream inputStream, Stream outputUnzippedStream, CompressionType compressionType)
* {
* if (inputStream == null) throw new ArgumentNullException("inputStream");
* if (outputUnzippedStream == null) throw new ArgumentNullException("outputUnzippedStream");
*
* Stream deflS = null;
*
* if (compressionType == CompressionType.DeflateStream)
* deflS = new DeflateStream(inputStream, CompressionMode.Decompress, true);
* else
* deflS = new GZipStream(inputStream, CompressionMode.Decompress, true);
*
* try
* {
* int bufferSize = SetBufferSize(inputStream.Length);
* byte[] buffer = new byte[bufferSize];
* int bytesRead = 0;
*
* do
* {
* bytesRead = deflS.Read(buffer, 0, bufferSize);
* outputUnzippedStream.Write(buffer, 0, bytesRead);
* } while (bytesRead != 0);
*
* outputUnzippedStream.Flush();
* deflS.Dispose();
* }
* finally { if (deflS != null) deflS.Dispose(); }
* }
*/
}
