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comparison 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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1470:8bba51a55704 1471:6dba84798cd5
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
10 /**
11 @file ocb3_int_xor_blocks.c
12 OCB implementation, INTERNAL ONLY helper, by Karel Miko
13 */
14 #include "tomcrypt.h"
15
16 #ifdef LTC_OCB3_MODE
17
18 /**
19 Compute xor for two blocks of bytes 'out = block_a XOR block_b' (internal function)
20 @param out The block of bytes (output)
21 @param block_a The block of bytes (input)
22 @param block_b The block of bytes (input)
23 @param block_len The size of block_a, block_b, out
24 */
25 void ocb3_int_xor_blocks(unsigned char *out, const unsigned char *block_a, const unsigned char *block_b, unsigned long block_len)
26 {
27 int x;
28 if (out == block_a) {
29 for (x = 0; x < (int)block_len; x++) out[x] ^= block_b[x];
30 }
31 else {
32 for (x = 0; x < (int)block_len; x++) out[x] = block_a[x] ^ block_b[x];
33 }
34 }
35
36 #endif
37
38 /* ref: $Format:%D$ */
39 /* git commit: $Format:%H$ */
40 /* commit time: $Format:%ai$ */