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Use an optblocker in crypto_verify_n()

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Frank Denis 2024-10-23 19:58:33 +02:00
parent 51d2455cd8
commit 0c1a25e9d1
1 changed files with 11 additions and 3 deletions
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14
src/libsodium/crypto_verify/verify.c
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@ -58,6 +58,8 @@ crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
#else #else
static volatile uint16_t optblocker_u16;
static inline int static inline int
crypto_verify_n(const unsigned char *x_, const unsigned char *y_, crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
const int n) const int n)
@ -66,13 +68,19 @@ crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
(const volatile unsigned char *volatile) x_; (const volatile unsigned char *volatile) x_;
const volatile unsigned char *volatile y = const volatile unsigned char *volatile y =
(const volatile unsigned char *volatile) y_; (const volatile unsigned char *volatile) y_;
volatile uint_fast16_t d = 0U; volatile uint16_t d = 0U;
int i; int i;
for (i = 0; i < n; i++) { for (i = 0; i < n; i++) {
d |= x[i] ^ y[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 #endif