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comparison src/pk/ecc/ltc_ecc_is_valid_idx.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
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280:59400faa4b44 380:d5faf4814ddb
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */
11
12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
13 *
14 * All curves taken from NIST recommendation paper of July 1999
15 * Available at http://csrc.nist.gov/cryptval/dss.htm
16 */
17 #include "tomcrypt.h"
18
19 /**
20 @file ltc_ecc_is_valid_idx.c
21 ECC Crypto, Tom St Denis
22 */
23
24 #ifdef MECC
25
26 /** Returns whether an ECC idx is valid or not
27 @param n The idx number to check
28 @return 1 if valid, 0 if not
29 */
30 int ltc_ecc_is_valid_idx(int n)
31 {
32 int x;
33
34 for (x = 0; ltc_ecc_sets[x].size != 0; x++);
35 /* -1 is a valid index --- indicating that the domain params were supplied by the user */
36 if ((n >= -1) || (n < x)) {
37 return 1;
38 }
39 return 0;
40 }
41
42 #endif
43 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c,v $ */
44 /* $Revision: 1.4 $ */
45 /* $Date: 2006/11/21 00:10:18 $ */
46