diff options
author | Matt Johnston <matt@ucc.asn.au> | 2007-01-11 03:14:55 +0000 |
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committer | Matt Johnston <matt@ucc.asn.au> | 2007-01-11 03:14:55 +0000 |
commit | 9d5ed350a749368c84254c11e7616ce3c891193a (patch) | |
tree | 6dacbff2e9f5c60a1568382db55c72dd6d2ce925 /libtomcrypt/src/encauth/ocb/ocb_ntz.c | |
parent | ca52f070aecf91e75f6ae6c87d4ae1a2189ccb14 (diff) | |
parent | 5ea605d8de5b4438deb4fa86c5231710dd09f934 (diff) |
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
to branch 'au.asn.ucc.matt.dropbear' (head ecd779509ef23a8cdf64888904fc9b31d78aa933)
--HG--
extra : convert_revision : d26d5eb2837f46b56a33fb0e7573aa0201abd4d5
Diffstat (limited to 'libtomcrypt/src/encauth/ocb/ocb_ntz.c')
-rw-r--r-- | libtomcrypt/src/encauth/ocb/ocb_ntz.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/libtomcrypt/src/encauth/ocb/ocb_ntz.c b/libtomcrypt/src/encauth/ocb/ocb_ntz.c new file mode 100644 index 0000000..8100ec0 --- /dev/null +++ b/libtomcrypt/src/encauth/ocb/ocb_ntz.c @@ -0,0 +1,42 @@ +/* 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, tomstdenis@gmail.com, 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 $ */ |