| /* 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 $ */ |