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| author | Niels Möller <nisse@lysator.liu.se> | 2020-11-01 10:22:48 +0100 |
|---|---|---|
| committer | Niels Möller <nisse@lysator.liu.se> | 2020-11-01 10:22:48 +0100 |
| commit | 172448b05931e791ce3470b45afe8de4cdffaaad (patch) | |
| tree | cd7d238a5ba07568c71619a9bb7819e107cfe205 /ecc-j-to-a.c | |
| parent | 98402b3b32b346a568c0d0d8e56a64f27116250c (diff) | |
| download | nettle-172448b05931e791ce3470b45afe8de4cdffaaad.tar.gz | |
Separate result area for ecc_mod_mul and ecc_mod_sqr.
* ecc-mod-arith.c (ecc_mod_mul, ecc_mod_sqr): Separate argument
for scratch area, reducing required size of result area. Update
all callers to naïvely keep using result in scratch area.
(ecc_mod_pow_2k, ecc_mod_pow_2k_mul): Simplified, also reducing
required size of result area.
Diffstat (limited to 'ecc-j-to-a.c')
| -rw-r--r-- | ecc-j-to-a.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/ecc-j-to-a.c b/ecc-j-to-a.c index 915c056b..882830c4 100644 --- a/ecc-j-to-a.c +++ b/ecc-j-to-a.c @@ -52,7 +52,7 @@ ecc_j_to_a (const struct ecc_curve *ecc, mp_limb_t cy; ecc->p.invert (&ecc->p, izp, p+2*ecc->p.size, izp + 2 * ecc->p.size); - ecc_mod_sqr (&ecc->p, iz2p, izp); + ecc_mod_sqr (&ecc->p, iz2p, izp, iz2p); if (ecc->use_redc) { @@ -63,7 +63,7 @@ ecc_j_to_a (const struct ecc_curve *ecc, } /* r_x <-- x / z^2 */ - ecc_mod_mul (&ecc->p, iz3p, iz2p, p); + ecc_mod_mul (&ecc->p, iz3p, iz2p, p, iz3p); /* ecc_mod (and ecc_mod_mul) may return a value up to 2p - 1, so do a conditional subtraction. */ cy = mpn_sub_n (r, iz3p, ecc->p.m, ecc->p.size); @@ -82,8 +82,8 @@ ecc_j_to_a (const struct ecc_curve *ecc, } return; } - ecc_mod_mul (&ecc->p, iz3p, iz2p, izp); - ecc_mod_mul (&ecc->p, tp, iz3p, p + ecc->p.size); + ecc_mod_mul (&ecc->p, iz3p, iz2p, izp, iz3p); + ecc_mod_mul (&ecc->p, tp, iz3p, p + ecc->p.size, tp); /* And a similar subtraction. */ cy = mpn_sub_n (r + ecc->p.size, tp, ecc->p.m, ecc->p.size); cnd_copy (cy, r + ecc->p.size, tp, ecc->p.size); |