/* -*-c-*-
*
- * $Id: ec.h,v 1.8 2004/03/27 17:54:11 mdw Exp $
+ * $Id: ec.h,v 1.9 2004/04/01 12:50:09 mdw Exp $
*
* Elliptic curve definitions
*
/*----- Revision history --------------------------------------------------*
*
* $Log: ec.h,v $
+ * 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.
*
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*/);
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))
/*----- 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
/*----- 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
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