/// <devdoc>
/// <para>
/// Performs encryption of an array of buffers,
/// proceeds buffer by buffer, if the individual
/// buffer size exceeds a SSL limit of 64K,
/// the buffers are then split into smaller ones.
/// Returns a new array of encrypted buffers.
/// </para>
/// </devdoc>
private BufferOffsetSize [] EncryptBuffers(BufferOffsetSize[] buffers)
{
// do we need lock this write as well?
ArrayList encryptedBufferList = new ArrayList(buffers.Length);
for (int i = 0; i < buffers.Length; i++)
{
SecureChannel chkSecureChannel = SecureChannel;
if (chkSecureChannel == null)
{
InnerException = new IOException(SR.GetString(SR.net_io_writefailure));
throw InnerException;
}
int offset = buffers[i].Offset;
int totalLeft = buffers[i].Size;
do
{
byte [] tempOutput = null;
int size = Math.Min(totalLeft, chkSecureChannel.MaxDataSize);
totalLeft -= size;
int errorCode = chkSecureChannel.Encrypt(buffers[i].Buffer, offset, size, ref tempOutput);
if (errorCode != (int)SecurityStatus.OK)
{
ProtocolToken message = new ProtocolToken(null, errorCode);
InnerException = message.GetException();
throw InnerException;
}
encryptedBufferList.Add(new BufferOffsetSize(tempOutput, false));
offset += size;
} while (totalLeft > 0);
}
return((BufferOffsetSize [])encryptedBufferList.ToArray(typeof(BufferOffsetSize)));
}
private IAsyncResult InnerWrite(bool async, byte[] buffer, int offset, int size, AsyncCallback asyncCallback, object asyncState)
{
// after shutdown/Close throw an exception
if (m_ShutDown > 0)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
// on earlier error throw an exception
if (InnerException != null)
{
throw InnerException;
}
//
// parameter validation
//
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0 || offset > buffer.Length)
{
throw new ArgumentOutOfRangeException("offset");
}
if (size < 0 || size > buffer.Length - offset)
{
throw new ArgumentOutOfRangeException("size");
}
//
// Lock the Write: this is inefficent, but we need to prevent
// writing data while the Stream is doing a handshake with the server.
// writing other data during the handshake would cause the server to
// fail and close the connection.
//
lock (this) {
//
// encrypt the data
//
byte[] ciphertext = null;
GlobalLog.Print("Encrypt[" + Encoding.ASCII.GetString(buffer, 0, Math.Min(buffer.Length, 512)) + "]");
SecureChannel chkSecureChannel = SecureChannel;
if (chkSecureChannel == null)
{
InnerException = new IOException(SR.GetString(SR.net_io_writefailure));
throw InnerException;
}
if (size > chkSecureChannel.MaxDataSize)
{
BufferOffsetSize [] buffers = new BufferOffsetSize[1];
buffers[0] = new BufferOffsetSize(buffer, offset, size, false);
if (async)
{
return(BeginMultipleWrite(buffers, asyncCallback, asyncState));
}
else
{
MultipleWrite(buffers);
return(null);
}
}
int errorCode = chkSecureChannel.Encrypt(buffer, offset, size, ref ciphertext);
if (errorCode != (int)SecurityStatus.OK)
{
ProtocolToken message = new ProtocolToken(null, errorCode);
InnerException = message.GetException();
throw InnerException;
}
try {
if (async)
{
IAsyncResult asyncResult =
base.BeginWrite(
ciphertext,
0,
ciphertext.Length,
asyncCallback,
asyncState);
return(asyncResult);
}
else
{
base.Write(ciphertext, 0, ciphertext.Length);
return(null);
}
}
catch (Exception exception) {
//
// some sort of error occured Writing to the Trasport,
// set the Exception as InnerException and throw
//
InnerException = new IOException(SR.GetString(SR.net_io_writefailure), exception);
throw InnerException;
}
}
}
