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Decrement and shift in separate steps

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This commit is contained in:
Frank Denis 2024-10-23 19:44:58 +02:00
parent d0eb23e532
commit 51d2455cd8
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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@ -621,9 +621,10 @@ equal(signed char b, signed char c)
return z;
#else
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 */
#endif
}