/* S is NOT an MPINT. "The value for 'rsa_signature_blob' is encoded as a string
* containing s (which is an integer, without lengths or padding, unsigned and in
* network byte order)." See also below.
*/
byte[] s = tr.readByteString();
if (s.length == 0)
throw new IOException("Error in RSA signature, S is empty.");
if (log.isEnabled())