haskell/cryptonite
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Merge pull request #291 from ocheron/p256-point-add

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Faster P256.pointAdd
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Olivier Chéron 2019-08-25 08:51:58 +02:00
commit 262252a5c4
1 changed files with 3 additions and 6 deletions
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cbits/p256/p256_ec.c
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@ -1287,19 +1287,16 @@ void cryptonite_p256e_point_add(
const cryptonite_p256_int *in_x2, const cryptonite_p256_int *in_y2, const cryptonite_p256_int *in_x2, const cryptonite_p256_int *in_y2,
cryptonite_p256_int *out_x, cryptonite_p256_int *out_y) cryptonite_p256_int *out_x, cryptonite_p256_int *out_y)
{ {
felem x1, y1, z1, x2, y2, z2, px1, py1, px2, py2; felem x, y, z, px1, py1, px2, py2;
const cryptonite_p256_int one = P256_ONE;
to_montgomery(px1, in_x1); to_montgomery(px1, in_x1);
to_montgomery(py1, in_y1); to_montgomery(py1, in_y1);
to_montgomery(px2, in_x2); to_montgomery(px2, in_x2);
to_montgomery(py2, in_y2); to_montgomery(py2, in_y2);
scalar_mult(x1, y1, z1, px1, py1, &one); point_add_or_double_vartime(x, y, z, px1, py1, kOne, px2, py2, kOne);
scalar_mult(x2, y2, z2, px2, py2, &one);
point_add_or_double_vartime(x1, y1, z1, x1, y1, z1, x2, y2, z2);
point_to_affine(px1, py1, x1, y1, z1); point_to_affine(px1, py1, x, y, z);
from_montgomery(out_x, px1); from_montgomery(out_x, px1);
from_montgomery(out_y, py1); from_montgomery(out_y, py1);
} }