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Use an optblocker in crypto_verify_n()

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This commit is contained in:
Frank Denis
2024-10-23 22:34:15 +02:00
parent c1fc74e690
commit 42f4e42b06
1 changed files with 11 additions and 3 deletions
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src/libsodium/crypto_verify/verify.c
+11 -3
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@@ -57,6 +57,8 @@ crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
#else
static volatile uint16_t optblocker_u16;
static inline int
crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
const int n)
@@ -65,13 +67,19 @@ crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
(const volatile unsigned char *volatile) x_;
const volatile unsigned char *volatile y =
(const volatile unsigned char *volatile) y_;
volatile uint_fast16_t d = 0U;
int i;
volatile uint16_t d = 0U;
int i;
for (i = 0; i < n; i++) {
d |= x[i] ^ y[i];
}
return (1 & ((d - 1) >> 8)) - 1;
# ifdef HAVE_INLINE_ASM
__asm__ __volatile__("" : "+r"(d) :);
# endif
d--;
d = ((d >> 13) ^ optblocker_u16) >> 2;
return (int) d - 1;
}
#endif