Add cyclic group abstraction, with test code. Separate off exponentation

[u/mdw/catacomb] / f-prime.c

diff --git a/f-prime.c b/f-prime.c
index 5ab4204..473ba4c 100644 (file)
--- a/f-prime.c
+++ b/f-prime.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: f-prime.c,v 1.5 2004/03/23 12:08:26 mdw Exp $
+ * $Id: f-prime.c,v 1.8 2004/04/01 12:50:09 mdw Exp $
  *
  * Prime fields with Montgomery arithmetic
  *
@@ -30,6 +30,19 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: f-prime.c,v $
+ * Revision 1.8  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 1.7  2004/03/27 17:54:11  mdw
+ * Standard curves and curve checking.
+ *
+ * Revision 1.6  2004/03/23 15:19:32  mdw
+ * Test elliptic curves more thoroughly.
+ *
  * Revision 1.5  2004/03/23 12:08:26  mdw
  * Random field-element selection.
  *
@@ -218,7 +231,8 @@ static mp *fhlv(field *ff, mp *d, mp *x)
 /* --- Field operations table --- */
 
 static field_ops fops = {
-  fdestroy, frand,
+  FTY_PRIME, "prime",
+  fdestroy, frand, field_stdsamep,
   fin, fout,
   fzerop, fneg, fadd, fsub, fmul, fsqr, finv, freduce, fsqrt,
   0,
@@ -242,6 +256,9 @@ field *field_prime(mp *p)
   mpmont_create(&f->mm, p);
   f->f.zero = MP_ZERO;
   f->f.one = f->mm.r;
+  f->f.m = f->mm.m;
+  f->f.nbits = mp_bits(p);
+  f->f.noctets = (f->f.nbits + 7) >> 3;
   return (&f->f);
 }