X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/432c4e184d44704511a5991b80224a87cb1d4613..02d7884df1f33c9c7dc3a14c4b1a5f520ebe090a:/ec.h

diff --git a/ec.h b/ec.h
index 79e3654..24bd6b2 100644
--- a/ec.h
+++ b/ec.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: ec.h,v 1.8 2004/03/27 17:54:11 mdw Exp $
+ * $Id: ec.h,v 1.10 2004/04/03 03:32:05 mdw Exp $
  *
  * Elliptic curve definitions
  *
@@ -30,6 +30,16 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: ec.h,v $
+ * Revision 1.10  2004/04/03 03:32:05  mdw
+ * General robustification.
+ *
+ * Revision 1.9  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 1.8  2004/03/27 17:54:11  mdw
  * Standard curves and curve checking.
  *
@@ -126,6 +136,7 @@ typedef struct ec_mulfactor {
 
 typedef struct ec_ops {
   void (*destroy)(ec_curve */*c*/);
+  int (*samep)(ec_curve */*c*/, ec_curve */*d*/);
   ec *(*in)(ec_curve */*c*/, ec */*d*/, const ec */*p*/);
   ec *(*out)(ec_curve */*c*/, ec */*d*/, const ec */*p*/);
   ec *(*fix)(ec_curve */*c*/, ec */*d*/, const ec */*p*/);
@@ -137,6 +148,7 @@ typedef struct ec_ops {
   int (*check)(ec_curve */*c*/, const ec */*p*/);
 } ec_ops;
 
+#define EC_SAMEP(c, d)		(c)->ops->samep((c), (d))
 #define EC_IN(c, d, p)		(c)->ops->in((c), (d), (p))
 #define EC_OUT(c, d, p)		(c)->ops->out((c), (d), (p))
 #define EC_FIX(c, d, p)		(c)->ops->fix((c), (d), (p))
@@ -278,6 +290,19 @@ extern int ec_eq(const ec *p, const ec *q);
 
 /*----- Interesting arithmetic --------------------------------------------*/
 
+/* --- @ec_samep@ --- *
+ *
+ * Arguments:	@ec_curve *c, *d@ = two elliptic curves
+ *
+ * Returns:	Nonzero if the curves are identical (not just isomorphic).
+ *
+ * Use:		Checks for sameness of curves.  This function does the full
+ *		check, not just the curve-type-specific check done by the
+ *		@sampep@ field operation.
+ */
+
+extern int ec_samep(ec_curve */*c*/, ec_curve */*d*/);
+
 /* --- @ec_find@ --- *
  *
  * Arguments:	@ec_curve *c@ = pointer to an elliptic curve
@@ -410,6 +435,17 @@ extern ec *ec_immul(ec_curve */*c*/, ec */*d*/,
 
 /*----- Standard curve operations -----------------------------------------*/
 
+/* --- @ec_stdsamep@ --- *
+ *
+ * Arguments:	@ec_curve *c, *d@ = two elliptic curves
+ *
+ * Returns:	Nonzero if the curves are identical (not just isomorphic).
+ *
+ * Use:		Simple sameness check on @a@ and @b@ curve members.
+ */
+
+extern int ec_stdsamep(ec_curve */*c*/, ec_curve */*d*/);
+
 /* --- @ec_idin@, @ec_idout@, @ec_idfix@ --- *
  *
  * Arguments:	@ec_curve *c@ = pointer to an elliptic curve
@@ -477,7 +513,7 @@ extern void ec_destroycurve(ec_curve */*c*/);
  * Arguments:	@field *f@ = the underlying field for this elliptic curve
  *		@mp *a, *b@ = the coefficients for this curve
  *
- * Returns:	A pointer to the curve.
+ * Returns:	A pointer to the curve, or null.
  *
  * Use:		Creates a curve structure for an elliptic curve defined over
  *		a prime field.  The @primeproj@ variant uses projective
@@ -492,7 +528,7 @@ extern ec_curve *ec_primeproj(field */*f*/, mp */*a*/, mp */*b*/);
  * Arguments:	@field *f@ = the underlying field for this elliptic curve
  *		@mp *a, *b@ = the coefficients for this curve
  *
- * Returns:	A pointer to the curve.
+ * Returns:	A pointer to the curve, or null.
  *
  * Use:		Creates a curve structure for an elliptic curve defined over
  *		a binary field.  The @binproj@ variant uses projective
@@ -574,6 +610,17 @@ extern int ec_infoparse(qd_parse */*qd*/, ec_info */*ei*/);
 
 extern const char *ec_getinfo(ec_info */*ei*/, const char */*p*/);
 
+/* --- @ec_sameinfop@ --- *
+ *
+ * Arguments:	@ec_info *ei, *ej@ = two elliptic curve parameter sets
+ *
+ * Returns:	Nonzero if the curves are identical (not just isomorphic).
+ *
+ * Use:		Checks for sameness of curve parameters.
+ */
+
+extern int ec_sameinfop(ec_info */*ei*/, ec_info */*ej*/);
+
 /* --- @ec_freeinfo@ --- *
  *
  * Arguments:	@ec_info *ei@ = elliptic curve information block to free