/* -*-c-*-
*
- * $Id: ec-info.c,v 1.6 2004/04/08 16:17:32 mdw Exp $
+ * $Id: ec-info.c,v 1.7 2004/04/17 09:58:37 mdw Exp $
*
* Elliptic curve information management
*
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);