/* -*-c-*-
*
- * $Id: mpbarrett-mexp.c,v 1.2 2004/04/01 12:50:09 mdw Exp $
+ * $Id$
*
* Multiple simultaneous exponentiations
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: mpbarrett-mexp.c,v $
- * Revision 1.2 2004/04/01 12:50:09 mdw
- * Add cyclic group abstraction, with test code. Separate off exponentation
- * functions for better static linking. Fix a buttload of bugs on the way.
- * Generally ensure that negative exponents do inversion correctly. Add
- * table of standard prime-field subgroups. (Binary field subgroups are
- * currently unimplemented but easy to add if anyone ever finds a good one.)
- *
- * Revision 1.1 2001/06/16 12:58:34 mdw
- * Added simultaneous exponentiation with Barrett reduction.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "mp.h"
for (i = 0; i < n; i++) {
if (f[i].exp->f & MP_BURN)
spare = MP_NEWSEC;
- if (!(f[i].exp->f & MP_NEG))
+ if (MP_NEGP(f[i].exp))
+ ff[i].base = mp_modinv(MP_NEW, f[i].base, mb->m);
+ else
ff[i].base = MP_COPY(f[i].base);
- else {
- ff[i].base = MP_NEW;
- mp_gcd(&g, 0, &ff[i].base, mb->m, f[i].base);
- assert(MP_EQ(g, MP_ONE));
- }
ff[i].exp = f[i].exp;
}
mp_drop(g);