diff options
Diffstat (limited to 'libtomcrypt/src/encauth/ocb/ocb_shift_xor.c')
| -rw-r--r-- | libtomcrypt/src/encauth/ocb/ocb_shift_xor.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c b/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c new file mode 100644 index 0000000..dea43ee --- /dev/null +++ b/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c @@ -0,0 +1,39 @@ +/* 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 $ */ |