Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_ntz.c @ 1307:ad9c40aca3bc

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add length checks for ecc too
author Matt Johnston <matt@ucc.asn.au>
date Tue, 12 Jul 2016 23:28:42 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 #include "tomcrypt.h"
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13 /**
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14 @file pmac_ntz.c
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15 PMAC implementation, internal function, by Tom St Denis
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16 */
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17
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18 #ifdef LTC_PMAC
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20 /**
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21 Internal PMAC function
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22 */
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23 int pmac_ntz(unsigned long x)
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24 {
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25 int c;
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26 x &= 0xFFFFFFFFUL;
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27 c = 0;
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28 while ((x & 1) == 0) {
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29 ++c;
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30 x >>= 1;
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31 }
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32 return c;
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33 }
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35 #endif
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37 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_ntz.c,v $ */
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38 /* $Revision: 1.5 $ */
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39 /* $Date: 2006/11/03 00:39:49 $ */