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improve a bit

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NIIBE Yutaka
2014-03-26 18:37:38 +09:00
parent fc53d507ce
commit 1920c5fc69
3 changed files with 42 additions and 42 deletions
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15
src/ecc-edwards.c
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@@ -219,20 +219,9 @@ ptc_to_ac_25519 (ac *X, const ptc *A)
/*
* A->z may be bigger than p25519, or two times bigger than p25519.
* We try to subtract p25519 twice.
* But this is no problem for computation of mod_inv.
*/
borrow = bn256_sub (z_inv, A->z, p25519);
if (borrow)
memcpy (z_inv, A->z, sizeof (bn256));
else
memcpy (z, A->z, sizeof (bn256)); /* dumy copy */
borrow = bn256_sub (z, z_inv, p25519);
if (borrow)
memcpy (z, z_inv, sizeof (bn256));
else
memcpy (z_inv, z, sizeof (bn256)); /* dumy copy */
mod_inv (z_inv, z, p25519);
mod_inv (z_inv, A->z, p25519);
mod25638_mul (X->x, A->x, z_inv);
borrow = bn256_sub (z, X->x, p25519);