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Fix documentation comments.

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Aiden Fox Ivey 2025-06-21 00:12:09 -04:00 committed by Jonathan Bennett
parent 98d010761e
commit 1378657206
1 changed files with 4 additions and 3 deletions
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7
src/mesh/aes-ccm.cpp
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@ -16,22 +16,23 @@
* @param a First byte array to compare * @param a First byte array to compare
* @param b Second byte array to compare * @param b Second byte array to compare
* @param len Number of bytes to compare * @param len Number of bytes to compare
* @return 0 if arrays are equal, 1 if different or if inputs are invalid * @return 0 if arrays are equal, -1 if different or if inputs are invalid
*/ */
static int constant_time_compare(const void *a_, const void *b_, size_t len) static int constant_time_compare(const void *a_, const void *b_, size_t len)
{ {
// Cast to volatile to prevent the compiler from optimizing out their comparison. /* Cast to volatile to prevent the compiler from optimizing out their comparison. */
const volatile uint8_t *volatile a = (const volatile uint8_t *volatile) a_; const volatile uint8_t *volatile a = (const volatile uint8_t *volatile) a_;
const volatile uint8_t *volatile b = (const volatile uint8_t *volatile) b_; const volatile uint8_t *volatile b = (const volatile uint8_t *volatile) b_;
if (len == 0) if (len == 0)
return 0; return 0;
if (a == NULL || b == NULL) if (a == NULL || b == NULL)
return 1; return -1;
size_t i; size_t i;
volatile uint8_t d = 0U; volatile uint8_t d = 0U;
for (i = 0U; i < len; i++) { for (i = 0U; i < len; i++) {
d |= (a[i] ^ b[i]); d |= (a[i] ^ b[i]);
} }
/* Constant time bit arithmetic to convert d > 0 to -1 and d = 0 to 0. */
return (1 & ((d - 1) >> 8)) - 1; return (1 & ((d - 1) >> 8)) - 1;
} }