Mercurial > dropbear
view libtomcrypt/src/encauth/ocb/ocb_ntz.c @ 1294:56aba7dedbea
options for disabling "normal" DH
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 02 May 2016 23:48:16 +0200 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, [email protected], http://libtomcrypt.com */ /** @file ocb_ntz.c OCB implementation, internal function, by Tom St Denis */ #include "tomcrypt.h" #ifdef OCB_MODE /** Returns the number of leading zero bits [from lsb up] @param x The 32-bit value to observe @return The number of bits [from the lsb up] that are zero */ int ocb_ntz(unsigned long x) { int c; x &= 0xFFFFFFFFUL; c = 0; while ((x & 1) == 0) { ++c; x >>= 1; } return c; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_ntz.c,v $ */ /* $Revision: 1.4 $ */ /* $Date: 2006/03/31 14:15:35 $ */