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Add another optblocker

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This commit is contained in:
Frank Denis 2024-08-01 14:32:16 +02:00
parent 92611e300d
commit 6edcd85169
1 changed files with 3 additions and 1 deletions
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4
src/libsodium/crypto_onetimeauth/poly1305/sse2/poly1305_sse2.c
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@ -194,6 +194,8 @@ poly1305_init_ext(poly1305_state_internal_t *st, const unsigned char key[32],
st->leftover = 0U;
}
static volatile uint64_t optblocker_u64;
static POLY1305_NOINLINE void
poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m,
unsigned long long bytes)
@ -745,7 +747,7 @@ poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m,
g1 &= 0xfffffffffff;
g2 = h2 + c - ((uint64_t) 1 << 42);
c = (g2 >> 63) - 1;
c = (((g2 >> 61) ^ optblocker_u64) >> 2) - 1;
nc = ~c;
h0 = (h0 & nc) | (g0 & c);
h1 = (h1 & nc) | (g1 & c);