Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c @ 701:20dafc77322e

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link to Dropbear webpage
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Mar 2013 19:43:47 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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382
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11
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12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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13 *
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14 * All curves taken from NIST recommendation paper of July 1999
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15 * Available at http://csrc.nist.gov/cryptval/dss.htm
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16 */
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17 #include "tomcrypt.h"
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18
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19 /**
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20 @file ltc_ecc_is_valid_idx.c
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21 ECC Crypto, Tom St Denis
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22 */
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23
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24 #ifdef MECC
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25
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26 /** Returns whether an ECC idx is valid or not
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27 @param n The idx number to check
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28 @return 1 if valid, 0 if not
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29 */
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30 int ltc_ecc_is_valid_idx(int n)
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31 {
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32 int x;
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33
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34 for (x = 0; ltc_ecc_sets[x].size != 0; x++);
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35 /* -1 is a valid index --- indicating that the domain params were supplied by the user */
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36 if ((n >= -1) || (n < x)) {
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37 return 1;
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38 }
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39 return 0;
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40 }
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41
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42 #endif
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43 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c,v $ */
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44 /* $Revision: 1.4 $ */
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45 /* $Date: 2006/11/21 00:10:18 $ */
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46