/* -*-c-*-
*
- * $Id: pfilt.c,v 1.5 2004/04/01 12:50:09 mdw Exp $
+ * $Id: pfilt.c,v 1.6 2004/04/08 01:36:15 mdw Exp $
*
* Finding and testing prime numbers
*
* (c) 1999 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Catacomb.
*
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
- *
+ *
* Catacomb is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
- *
+ *
* You should have received a copy of the GNU Library General Public
* License along with Catacomb; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: pfilt.c,v $
- * Revision 1.5 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 1.4 2000/10/08 12:14:57 mdw
- * Remove vestiges of @primorial@.
- *
- * Revision 1.3 2000/08/15 21:44:27 mdw
- * (pfilt_smallfactor): New function for doing trial division the hard
- * way.
- *
- * (pfilt_create): Use @mpx_udivn@ for computing residues, for improved
- * performance.
- *
- * Pull the `small prime' test into a separate function, and do it
- * properly.
- *
- * Revision 1.2 2000/06/17 11:54:27 mdw
- * Use new MP memory management functions.
- *
- * Revision 1.1 1999/12/22 15:49:39 mdw
- * Renamed from `pgen'. Reworking for new prime-search system.
- *
- * Revision 1.3 1999/12/10 23:28:35 mdw
- * Track suggested destination changes.
- *
- * Revision 1.2 1999/11/20 22:23:05 mdw
- * Add multiply-and-add function for Diffie-Hellman safe prime generation.
- *
- * Revision 1.1 1999/11/19 13:17:57 mdw
- * Prime number generator and tester.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "mp.h"
max = mp_sqr(max, max);
max->a->n--; /* Permanent allocation */
}
- if (MP_CMP(m, <, max))
+ if (MP_CMP(m, <=, MP_ONE))
+ rc = PGEN_FAIL;
+ else if (MP_CMP(m, <, max))
rc = PGEN_DONE;
return (rc);
}
rc = PGEN_DONE;
else
rc = PGEN_FAIL;
+ break;
}
}
}
/* --- Gallivant through the residue table --- */
-
+
for (i = 0; i < NPRIME; i++) {
p->r[i] = (q->r[i] * m + a) % primetab[i];
if (!p->r[i] && rc == PGEN_TRY) {