/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
/**
@file ocb3_int_ntz.c
OCB implementation, INTERNAL ONLY helper, by Tom St Denis
*/
#include "tomcrypt_private.h"
#ifdef LTC_OCB3_MODE
/**
Returns the number of leading zero bits [from lsb up] (internal function)
@param x The 32-bit value to observe
@return The number of bits [from the lsb up] that are zero
*/
int ocb3_int_ntz(unsigned long x)
{
int c;
x &= 0xFFFFFFFFUL;
c = 0;
while ((x & 1) == 0) {
++c;
x >>= 1;
}
return c;
}
#endif