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comparison src/mac/pmac/pmac_shift_xor.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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143:5d99163f7e32 191:1c15b283127b
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 #include "tomcrypt.h"
12
13 /**
14 @file pmac_shift_xor.c
15 PMAC implementation, internal function, by Tom St Denis
16 */
17
18 #ifdef PMAC
19
20 /**
21 Internal function. Performs the state update (adding correct multiple)
22 @param pmac The PMAC state.
23 */
24 void pmac_shift_xor(pmac_state *pmac)
25 {
26 int x, y;
27 y = pmac_ntz(pmac->block_index++);
28 #ifdef LTC_FAST
29 for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) {
30 *((LTC_FAST_TYPE*)((unsigned char *)pmac->Li + x)) ^=
31 *((LTC_FAST_TYPE*)((unsigned char *)pmac->Ls[y] + x));
32 }
33 #else
34 for (x = 0; x < pmac->block_len; x++) {
35 pmac->Li[x] ^= pmac->Ls[y][x];
36 }
37 #endif
38 }
39
40 #endif