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wg: encoding: be more paranoid

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Needless, but overkill can be fun.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2017-10-15 21:29:01 +02:00
parent eb68ad0722
commit 7fe7f81088
1 changed files with 2 additions and 2 deletions
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4
src/encoding.c
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@ -102,10 +102,10 @@ bool key_from_hex(uint8_t key[static WG_KEY_LEN], const char *hex)
bool key_is_zero(const uint8_t key[static WG_KEY_LEN]) bool key_is_zero(const uint8_t key[static WG_KEY_LEN])
{ {
uint8_t acc = 0; volatile uint8_t acc = 0;
for (unsigned int i = 0; i < WG_KEY_LEN; ++i) { for (unsigned int i = 0; i < WG_KEY_LEN; ++i) {
acc |= key[i]; acc |= key[i];
__asm__ ("" : "=r" (acc) : "0" (acc)); __asm__ ("" : "=r" (acc) : "0" (acc));
} }
return acc == 0; return 1 & ((acc - 1) >> 8);
} }