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Decrement and shift in separate steps

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Frank Denis 2024-10-23 19:44:58 +02:00
parent 409b3a70ad
commit 96d115cf29
1 changed files with 3 additions and 2 deletions
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5
src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
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@ -566,9 +566,10 @@ static unsigned char
equal(signed char b, signed char c) equal(signed char b, signed char c)
{ {
const unsigned char x = (unsigned char) b ^ (unsigned char) c; /* 0: yes; 1..255: no */ const unsigned char x = (unsigned char) b ^ (unsigned char) c; /* 0: yes; 1..255: no */
const uint32_t y = (uint32_t) x; /* 0: yes; 1..255: no */ uint32_t y = (uint32_t) x; /* 0: yes; 1..255: no */
return (((y - 1) >> 29) ^ optblocker_u8) >> 2; /* 1: yes; 0: no */ y--;
return ((y >> 29) ^ optblocker_u8) >> 2; /* 1: yes; 0: no */
} }
static unsigned char static unsigned char