Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_ntz.c @ 1683:41bf8f216644

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merge rsa-sha256
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 00:24:02 +0800
parents 6dba84798cd5
children
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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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10 /**
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11 @file ocb_ntz.c
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12 OCB implementation, internal function, by Tom St Denis
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13 */
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15 #include "tomcrypt.h"
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16
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17 #ifdef LTC_OCB_MODE
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19 /**
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20 Returns the number of leading zero bits [from lsb up]
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21 @param x The 32-bit value to observe
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22 @return The number of bits [from the lsb up] that are zero
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23 */
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24 int ocb_ntz(unsigned long x)
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25 {
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26 int c;
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27 x &= 0xFFFFFFFFUL;
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28 c = 0;
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29 while ((x & 1) == 0) {
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30 ++c;
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31 x >>= 1;
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32 }
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33 return c;
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34 }
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36 #endif
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37
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38 /* ref: $Format:%D$ */
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39 /* git commit: $Format:%H$ */
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40 /* commit time: $Format:%ai$ */