/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
/**
@file ocb3_int_xor_blocks.c
OCB implementation, INTERNAL ONLY helper, by Karel Miko
*/
#include "tomcrypt_private.h"
#ifdef LTC_OCB3_MODE
/**
Compute xor for two blocks of bytes 'out = block_a XOR block_b' (internal function)
@param out The block of bytes (output)
@param block_a The block of bytes (input)
@param block_b The block of bytes (input)
@param block_len The size of block_a, block_b, out
*/
void ocb3_int_xor_blocks(unsigned char *out, const unsigned char *block_a, const unsigned char *block_b, unsigned long block_len)
{
int x;
if (out == block_a) {
for (x = 0; x < (int)block_len; x++) out[x] ^= block_b[x];
}
else {
for (x = 0; x < (int)block_len; x++) out[x] = block_a[x] ^ block_b[x];
}
}
#endif