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annotate libtomcrypt/src/encauth/ocb3/ocb3_int_xor_blocks.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 /**
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11 @file ocb3_int_xor_blocks.c
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12 OCB implementation, INTERNAL ONLY helper, by Karel Miko
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_OCB3_MODE
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17
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18 /**
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19 Compute xor for two blocks of bytes 'out = block_a XOR block_b' (internal function)
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20 @param out The block of bytes (output)
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21 @param block_a The block of bytes (input)
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22 @param block_b The block of bytes (input)
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23 @param block_len The size of block_a, block_b, out
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24 */
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25 void ocb3_int_xor_blocks(unsigned char *out, const unsigned char *block_a, const unsigned char *block_b, unsigned long block_len)
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26 {
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27 int x;
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28 if (out == block_a) {
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29 for (x = 0; x < (int)block_len; x++) out[x] ^= block_b[x];
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30 }
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31 else {
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32 for (x = 0; x < (int)block_len; x++) out[x] = block_a[x] ^ block_b[x];
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33 }
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34 }
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35
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36 #endif
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37
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38 /* ref: $Format:%D$ */
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39 /* git commit: $Format:%H$ */
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40 /* commit time: $Format:%ai$ */