diff libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c @ 382:0cbe8f6dbf9e

propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f) to branch 'au.asn.ucc.matt.dropbear' (head 02c413252c90e9de8e03d91e9939dde3029f5c0a)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:41:05 +0000
parents
children f849a5ca2efc
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c	Thu Jan 11 02:41:05 2007 +0000
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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtomcrypt.com
+ */
+
+/* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
+ *
+ * All curves taken from NIST recommendation paper of July 1999
+ * Available at http://csrc.nist.gov/cryptval/dss.htm
+ */
+#include "tomcrypt.h"
+
+/**
+  @file ltc_ecc_is_valid_idx.c
+  ECC Crypto, Tom St Denis
+*/  
+
+#ifdef MECC
+
+/** Returns whether an ECC idx is valid or not
+  @param n   The idx number to check
+  @return 1 if valid, 0 if not
+*/  
+int ltc_ecc_is_valid_idx(int n)
+{
+   int x;
+
+   for (x = 0; ltc_ecc_sets[x].size != 0; x++);
+   /* -1 is a valid index --- indicating that the domain params were supplied by the user */
+   if ((n >= -1) || (n < x)) {
+      return 1;
+   }
+   return 0;
+}
+
+#endif
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2006/11/21 00:10:18 $ */
+