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comparison libtomcrypt/src/encauth/ocb/ocb_shift_xor.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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281:997e6f7dc01e 285:1b9e69c058d2
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11
12 /**
13 @file ocb_shift_xor.c
14 OCB implementation, internal function, by Tom St Denis
15 */
16 #include "tomcrypt.h"
17
18 #ifdef OCB_MODE
19
20 /**
21 Compute the shift/xor for OCB (internal function)
22 @param ocb The OCB state
23 @param Z The destination of the shift
24 */
25 void ocb_shift_xor(ocb_state *ocb, unsigned char *Z)
26 {
27 int x, y;
28 y = ocb_ntz(ocb->block_index++);
29 for (x = 0; x < ocb->block_len; x++) {
30 ocb->Li[x] ^= ocb->Ls[y][x];
31 Z[x] = ocb->Li[x] ^ ocb->R[x];
32 }
33 }
34
35 #endif
36
37 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_shift_xor.c,v $ */
38 /* $Revision: 1.3 $ */
39 /* $Date: 2005/05/05 14:35:58 $ */