diff options
Diffstat (limited to 'src/mac/pmac/pmac_shift_xor.c')
| -rw-r--r-- | src/mac/pmac/pmac_shift_xor.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/mac/pmac/pmac_shift_xor.c b/src/mac/pmac/pmac_shift_xor.c new file mode 100644 index 0000000..f24c22b --- /dev/null +++ b/src/mac/pmac/pmac_shift_xor.c @@ -0,0 +1,44 @@ +/* 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.org + */ +#include "tomcrypt.h" + +/** + @file pmac_shift_xor.c + PMAC implementation, internal function, by Tom St Denis +*/ + +#ifdef PMAC + +/** + Internal function. Performs the state update (adding correct multiple) + @param pmac The PMAC state. +*/ +void pmac_shift_xor(pmac_state *pmac) +{ + int x, y; + y = pmac_ntz(pmac->block_index++); +#ifdef LTC_FAST + for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) { + *((LTC_FAST_TYPE*)((unsigned char *)pmac->Li + x)) ^= + *((LTC_FAST_TYPE*)((unsigned char *)pmac->Ls[y] + x)); + } +#else + for (x = 0; x < pmac->block_len; x++) { + pmac->Li[x] ^= pmac->Ls[y][x]; + } +#endif +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_shift_xor.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ |