RE: Subtract betwen two EC_POINT

2008-07-04 Thread Bill Colvin
Pietro: OpenSSL seems to provide add, double, invert and multiply routines for EC points. There does not seem to be an explicit routine for subtract in the include files. The book Implementing Eliptic Curve Cryptography by Michael Rosing has routines esub and poly_esub for doing a subtraction

RE: Subtract betwen two EC_POINT

2008-07-04 Thread Pietro Albano
Thanks for the interest, i resolved with EC_POINT_invert(). EC-Elgamal work fine :) Il giorno ven, 04/07/2008 alle 11.56 -0600, Bill Colvin ha scritto: Pietro: OpenSSL seems to provide add, double, invert and multiply routines for EC points. There does not seem to be an explicit routine for