/* -*-c-*-
*
- * $Id: f-binpoly.c,v 1.1.2.1 2004/03/21 22:39:46 mdw Exp $
+ * $Id: f-binpoly.c,v 1.6 2004/04/01 12:50:09 mdw Exp $
*
* Binary fields with polynomial basis representation
*
/*----- Revision history --------------------------------------------------*
*
* $Log: f-binpoly.c,v $
+ * Revision 1.6 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 1.5 2004/03/27 17:54:11 mdw
+ * Standard curves and curve checking.
+ *
+ * Revision 1.4 2004/03/23 15:19:32 mdw
+ * Test elliptic curves more thoroughly.
+ *
+ * Revision 1.3 2004/03/23 12:08:26 mdw
+ * Random field-element selection.
+ *
+ * Revision 1.2 2004/03/21 22:52:06 mdw
+ * Merge and close elliptic curve branch.
+ *
* Revision 1.1.2.1 2004/03/21 22:39:46 mdw
* Elliptic curves on binary fields work.
*
#include "field.h"
#include "gf.h"
#include "gfreduce.h"
+#include "mprand.h"
/*----- Data structures ---------------------------------------------------*/
DESTROY(f);
}
+static mp *frand(field *f, mp *d, grand *r)
+{
+ return (mprand(d, f->nbits, r, 0));
+}
+
static int fzerop(field *ff, mp *x)
{
return (!MP_LEN(x));
/* --- Field operations table --- */
static field_ops fops = {
- fdestroy,
+ FTY_BINARY, "binpoly",
+ fdestroy, frand, field_stdsamep,
freduce, field_id,
fzerop, field_id, fadd, fadd, fmul, fsqr, finv, freduce, fsqrt,
fquadsolve,
f->f.ops = &fops;
f->f.zero = MP_ZERO;
f->f.one = MP_ONE;
+ f->f.nbits = mp_bits(p) - 1;
+ f->f.noctets = (f->f.nbits + 7) >> 3;
gfreduce_create(&f->r, p);
+ f->f.m = f->r.p;
return (&f->f);
}