/// <summary>
/// Verifies the signature of a message
/// </summary>
public void VerifySignature(SecurityContext context, byte[] message, byte[] signature)
{
// parameters validation
if (context == null)
{
throw new ArgumentNullException("context");
}
if (message == null)
{
throw new ArgumentNullException("message");
}
if (signature == null)
{
throw new ArgumentNullException("signature");
}
// prepare buffers
SecurityBuffers inputBuffers = new SecurityBuffers(2);
inputBuffers.SetBuffer(0, (int)SSPINative.SECBUFFER_DATA, message);
inputBuffers.SetBuffer(1, (int)SSPINative.SECBUFFER_TOKEN, signature);
// verify signature
Int64 contextHandle = context.Handle;
int error = SSPINative.VerifySignature(
ref contextHandle,
inputBuffers,
0,
0);
if (error < 0)
{
switch (error)
{
case SSPINative.SEC_E_MESSAGE_ALTERED:
throw new SSPIException(error, "The message or signature supplied for verification has been altered");
case SSPINative.SEC_E_OUT_OF_SEQUENCE:
throw new SSPIException(error, "The message supplied for verification is out of sequence");
default:
throw new SSPIException(error, "Could not verify message signature");
}
;
}
}