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btstack_crypto: spell out min operation for c-stat

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This commit is contained in:
Matthias Ringwald 2019-11-15 17:06:18 +01:00
parent 9ad0dd7c75
commit a512579c63
1 changed files with 7 additions and 6 deletions

13
src/btstack_crypto.c

@ -524,8 +524,6 @@ static void btstack_crypto_ccm_calc_x1(btstack_crypto_ccm_t * btstack_crypto_ccm
}
static void btstack_crypto_ccm_calc_xn(btstack_crypto_ccm_t * btstack_crypto_ccm, const uint8_t * plaintext){
int i;
int bytes_to_decrypt;
uint8_t btstack_crypto_ccm_buffer[16];
btstack_crypto_ccm->state = CCM_W4_XN;
@ -533,11 +531,14 @@ static void btstack_crypto_ccm_calc_xn(btstack_crypto_ccm_t * btstack_crypto_ccm
printf("%16s: ", "bn");
printf_hexdump(plaintext, 16);
#endif
bytes_to_decrypt = btstack_min(btstack_crypto_ccm->block_len, 16);
i = 0;
while (i < bytes_to_decrypt){
uint8_t i;
uint8_t bytes_to_decrypt = btstack_crypto_ccm->block_len;
// use explicit min implementation as c-stat worried about out-of-bounds-reads
if (bytes_to_decrypt > 16) {
bytes_to_decrypt = 16;
}
for (i = 0; i < bytes_to_decrypt ; i++){
btstack_crypto_ccm_buffer[i] = btstack_crypto_ccm->x_i[i] ^ plaintext[i];
i++;
}
memcpy(&btstack_crypto_ccm_buffer[i], &btstack_crypto_ccm->x_i[i], 16 - bytes_to_decrypt);
#ifdef DEBUG_CCM