/// <summary>
/// Decrypts message
/// </summary>
public byte[] DecryptMessage(SecurityContext context, byte[] encBuffer)
{
// parameters validation
if (context == null)
{
throw new ArgumentNullException("context");
}
if (encBuffer == null)
{
throw new ArgumentNullException("encMessage");
}
// parse encrypted buffer
byte[] encrypted;
byte[] trailer;
ParseEncryptedBuffer(encBuffer, out encrypted, out trailer);
// prepare buffers
SecurityBuffers inputBuffers = new SecurityBuffers(2);
inputBuffers.SetBuffer(0, (int)SSPINative.SECBUFFER_DATA, encrypted);
inputBuffers.SetBuffer(1, (int)SSPINative.SECBUFFER_TOKEN, trailer);
// encrypt message
Int64 contextHandle = context.Handle;
int error = SSPINative.DecryptMessage(
ref contextHandle,
inputBuffers,
0,
0);
if (error < 0)
{
throw new SSPIException(error, "Could not decrypt message");
}
// get decrypted message
byte[] message = inputBuffers.GetBuffer(0);
inputBuffers.Dispose();
return(message);
}
