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Fix for constant time (step 2)

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NIIBE Yutaka
2014-01-21 13:31:23 +09:00
parent 007eada502
commit 80d935d913
1 changed files with 9 additions and 5 deletions
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14
src/mod.c
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@@ -116,11 +116,15 @@ mod_reduce (bn256 *X, const bn512 *A, const bn256 *B, const bn256 *MU_lower)
q_big->word[8] -= tmp->word[8];
carry = q_big->word[8];
while (carry)
{
borrow_next = bn256_sub (X, X, B);
carry -= borrow_next;
}
if (carry)
carry -= bn256_sub (X, X, B);
else
bn256_sub (q, X, B);
if (carry)
carry -= bn256_sub (X, X, B);
else
bn256_sub (q, X, B);
borrow = bn256_sub (q, X, B);
if (borrow)