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41 lines
880 B
C
41 lines
880 B
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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/**
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@file ocb_ntz.c
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OCB implementation, internal function, by Tom St Denis
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*/
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#include "tomcrypt.h"
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#ifdef LTC_OCB_MODE
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/**
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Returns the number of leading zero bits [from lsb up]
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@param x The 32-bit value to observe
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@return The number of bits [from the lsb up] that are zero
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*/
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int ocb_ntz(unsigned long x)
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{
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int c;
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x &= 0xFFFFFFFFUL;
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c = 0;
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while ((x & 1) == 0) {
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++c;
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x >>= 1;
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}
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return c;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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