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41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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/**
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@file ocb3_int_xor_blocks.c
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OCB implementation, INTERNAL ONLY helper, by Karel Miko
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*/
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#include "tomcrypt.h"
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#ifdef LTC_OCB3_MODE
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/**
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Compute xor for two blocks of bytes 'out = block_a XOR block_b' (internal function)
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@param out The block of bytes (output)
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@param block_a The block of bytes (input)
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@param block_b The block of bytes (input)
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@param block_len The size of block_a, block_b, out
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*/
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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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{
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int x;
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if (out == block_a) {
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for (x = 0; x < (int)block_len; x++) out[x] ^= block_b[x];
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}
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else {
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for (x = 0; x < (int)block_len; x++) out[x] = block_a[x] ^ block_b[x];
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}
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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