/// <summary>
/// Writes a sequence of bytes to the current stream. The data is encrypted first before sending out.
/// </summary>
/// <param name="buffer">The buffer to be sent.</param>
/// <param name="offset">The offset in buffer at which to begin writing to the stream.</param>
/// <param name="count">The number of bytes to be written.</param>
/// <exception cref="IOException">Raised when attempting to read from/write to a remote connection which
/// has been closed</exception>
/// <exception cref="ArgumentOutOfRangeException">Raised when the offset incremented by count exceeds
/// the length of buffer</exception>
public override void Write(byte[] buffer, int offset, int count)
{
if (offset > buffer.Length - 1)
{
throw new ArgumentOutOfRangeException("offset");
}
if (offset + count > buffer.Length)
{
throw new ArgumentOutOfRangeException("count");
}
byte[] outBuffer = new byte[count];
Array.Copy(buffer, offset, outBuffer, 0, count);
// Encrypt message
SecurityPackageContextStreamSizes streamSizes =
(SecurityPackageContextStreamSizes)context.QueryContextAttributes("SECPKG_ATTR_STREAM_SIZES");
SecurityBuffer messageBuffer = new SecurityBuffer(SecurityBufferType.Data, buffer);
SecurityBuffer headerBuffer = new SecurityBuffer(
SecurityBufferType.StreamHeader,
new byte[streamSizes.Header]);
SecurityBuffer trailerBuffer = new SecurityBuffer(
SecurityBufferType.StreamTrailer,
new byte[streamSizes.Trailer]);
SecurityBuffer emptyBuffer = new SecurityBuffer(SecurityBufferType.Empty, null);
context.Encrypt(headerBuffer, messageBuffer, trailerBuffer, emptyBuffer);
byte[] encryptedMsg = ArrayUtility.ConcatenateArrays(
headerBuffer.Buffer,
messageBuffer.Buffer,
trailerBuffer.Buffer);
serverStream.Write(encryptedMsg, 0, encryptedMsg.Length);
}
/// <summary>
/// Writes a sequence of bytes to the current stream. The data is encrypted first before sending out.
/// </summary>
/// <param name="buffer">The buffer to be sent.</param>
/// <param name="offset">The offset in buffer at which to begin writing to the stream.</param>
/// <param name="count">The number of bytes to be written.</param>
/// <exception cref="IOException">Raised when attempting to read from/write to a remote connection which
/// has been closed</exception>
/// <exception cref="ArgumentOutOfRangeException">Raised when the offset incremented by count exceeds
/// the length of buffer</exception>
public override void Write(byte[] buffer, int offset, int count)
{
if (offset > buffer.Length - 1)
{
throw new ArgumentOutOfRangeException("offset");
}
if (offset + count > buffer.Length)
{
throw new ArgumentOutOfRangeException("count");
}
// Get stream attribute
SecurityPackageContextStreamSizes streamSizes =
(SecurityPackageContextStreamSizes)context.QueryContextAttributes("SECPKG_ATTR_STREAM_SIZES");
int chunckSize = (int)streamSizes.MaximumMessage;
List <byte> byteList = new List <byte>();
while (count > 0)
{
int bufferSize = count;
if (bufferSize > chunckSize)
{
bufferSize = chunckSize;
}
byte[] outBuffer = new byte[bufferSize];
Array.Copy(buffer, offset, outBuffer, 0, bufferSize);
count -= bufferSize;
offset += bufferSize;
// Encrypt Chunck
SecurityBuffer messageBuffer = new SecurityBuffer(SecurityBufferType.Data, outBuffer);
SecurityBuffer headerBuffer = new SecurityBuffer(
SecurityBufferType.StreamHeader,
new byte[streamSizes.Header]);
SecurityBuffer trailerBuffer = new SecurityBuffer(
SecurityBufferType.StreamTrailer,
new byte[streamSizes.Trailer]);
SecurityBuffer emptyBuffer = new SecurityBuffer(SecurityBufferType.Empty, null);
context.Encrypt(headerBuffer, messageBuffer, trailerBuffer, emptyBuffer);
byte[] encryptedChunck = ArrayUtility.ConcatenateArrays(
headerBuffer.Buffer,
messageBuffer.Buffer,
trailerBuffer.Buffer);
byteList.AddRange(encryptedChunck);
}
byte[] encryptedMsg = byteList.ToArray();
serverStream.Write(encryptedMsg, 0, encryptedMsg.Length);
}
