/* -*-c-*-
*
- * $Id: ec-info.c,v 1.4 2004/04/03 03:32:05 mdw Exp $
+ * $Id: ec-info.c,v 1.7 2004/04/17 09:58:37 mdw Exp $
*
* Elliptic curve information management
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: ec-info.c,v $
- * Revision 1.4 2004/04/03 03:32:05 mdw
- * General robustification.
- *
- * Revision 1.3 2004/04/01 21:28:41 mdw
- * Normal basis support (translates to poly basis internally). Rewrite
- * EC and prime group table generators in awk, so that they can reuse data
- * for repeated constants.
- *
- * Revision 1.2 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 1.1 2004/03/27 17:54:11 mdw
- * Standard curves and curve checking.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "ec.h"
if (!pgen_primep(ei->r, gr)) return ("generator order not prime");
- /* --- Check %$0 < h \le 4$% --- */
-
- if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
- return ("cofactor out of range");
-
/* --- Check %$h = \lfloor (\sqrt{p} + 1)^2/r \rlfoor$% --- *
*
* This seems to work with the approximate-sqrt in the library, but might
MP_DROP(x);
if (i) return ("curve is weak");
+ /* --- Check %$0 < h \le 4$% --- */
+
+ if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
+ return ("cofactor out of range");
+
/* --- Done --- */
return (0);
if (!pgen_primep(ei->r, gr)) return ("generator order not prime");
- /* --- Check %$0 < h \le 4$% --- */
-
- if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
- return ("cofactor out of range");
-
/* --- Check %$h = \lfloor (\sqrt{2^m} + 1)^2/r \rlfoor$% --- *
*
* This seems to work with the approximate-sqrt in the library, but might
MP_DROP(x);
if (i) return ("curve is weak");
+ /* --- Check %$0 < h \le 4$% --- */
+
+ if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
+ return ("cofactor out of range");
+
/* --- Done --- */
return (0);
#include "fibrand.h"
-int main(void)
+int main(int argc, char *argv[])
{
const ecentry *ee;
const char *e;
int ok = 1;
+ int i;
grand *gr;
gr = fibrand_create(0);
- fputs("checking standard curves: ", stdout);
- for (ee = ectab; ee->name; ee++) {
- ec_info ei;
- getinfo(&ei, ee->data);
- e = ec_checkinfo(&ei, gr);
- ec_freeinfo(&ei);
- if (e) {
- fprintf(stderr, "\n*** curve %s fails: %s\n", ee->name, e);
- ok = 0;
+ if (argc > 1) {
+ for (i = 1; i < argc; i++) {
+ ec_info ei;
+ if ((e = ec_getinfo(&ei, argv[i])) != 0)
+ fprintf(stderr, "bad curve spec `%s': %s", argv[i], e);
+ else {
+ e = ec_checkinfo(&ei, gr);
+ ec_freeinfo(&ei);
+ if (!e)
+ printf("OK %s\n", argv[i]);
+ else {
+ printf("BAD %s: %s\n", argv[i], e);
+ ok = 0;
+ }
+ }
+ }
+ } else {
+ fputs("checking standard curves: ", stdout);
+ for (ee = ectab; ee->name; ee++) {
+ ec_info ei;
+ getinfo(&ei, ee->data);
+ e = ec_checkinfo(&ei, gr);
+ ec_freeinfo(&ei);
+ if (e) {
+ fprintf(stderr, "\n*** curve %s fails: %s\n", ee->name, e);
+ ok = 0;
+ }
+ putchar('.');
+ fflush(stdout);
}
- putchar('.');
- fflush(stdout);
+ fputs(ok ? " ok\n" : " failed\n", stdout);
}
gr->ops->destroy(gr);
- fputs(ok ? " ok\n" : " failed\n", stdout);
return (!ok);
}