| /* 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_shift_xor.c |
| OCB implementation, internal function, by Tom St Denis |
| */ |
| #include "tomcrypt.h" |
| |
| #ifdef OCB_MODE |
| |
| /** |
| Compute the shift/xor for OCB (internal function) |
| @param ocb The OCB state |
| @param Z The destination of the shift |
| */ |
| void ocb_shift_xor(ocb_state *ocb, unsigned char *Z) |
| { |
| int x, y; |
| y = ocb_ntz(ocb->block_index++); |
| for (x = 0; x < ocb->block_len; x++) { |
| ocb->Li[x] ^= ocb->Ls[y][x]; |
| Z[x] = ocb->Li[x] ^ ocb->R[x]; |
| } |
| } |
| |
| #endif |
| |
| /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c,v $ */ |
| /* $Revision: 1.4 $ */ |
| /* $Date: 2006/03/31 14:15:35 $ */ |