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annotate ocb_shift_xor.c @ 162:bc4e3ac2dd5a libtomcrypt

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make data pointers volatile so that memory zeroing won't get optimised away
author Matt Johnston <matt@ucc.asn.au>
date Sun, 02 Jan 2005 17:09:05 +0000
parents d7da3b1e1540
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11
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12 /* OCB Implementation by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef OCB_MODE
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16
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17 void ocb_shift_xor(ocb_state *ocb, unsigned char *Z)
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18 {
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19 int x, y;
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20 y = ocb_ntz(ocb->block_index++);
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21 for (x = 0; x < ocb->block_len; x++) {
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22 ocb->Li[x] ^= ocb->Ls[y][x];
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23 Z[x] = ocb->Li[x] ^ ocb->R[x];
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24 }
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25 }
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27 #endif