Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_ntz.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
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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12 /**
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13 @file ocb_ntz.c
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14 OCB implementation, internal function, by Tom St Denis
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15 */
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17 #include "tomcrypt.h"
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19 #ifdef OCB_MODE
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21 /**
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22 Returns the number of leading zero bits [from lsb up]
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23 @param x The 32-bit value to observe
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24 @return The number of bits [from the lsb up] that are zero
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25 */
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26 int ocb_ntz(unsigned long x)
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27 {
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28 int c;
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29 x &= 0xFFFFFFFFUL;
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30 c = 0;
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31 while ((x & 1) == 0) {
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32 ++c;
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33 x >>= 1;
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34 }
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35 return c;
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36 }
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38 #endif
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40 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_ntz.c,v $ */
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41 /* $Revision: 1.4 $ */
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42 /* $Date: 2006/03/31 14:15:35 $ */