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Fix Curve25519 public key computation.

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-11-02 16:47:47 +09:00
parent 8afa5836ac
commit 5258389556
2 changed files with 9 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2021-11-02 NIIBE Yutaka <gniibe@shouwa2020.gniibe.org>
* src/ecc-mont.c (ecdh_compute_public_25519): Fix alignment
problem.
2021-11-02 NIIBE Yutaka <gniibe@fsij.org>
* tests/: Add tests for ECC curves. Support Yubikey.

6
src/ecc-mont.c
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@ -2,7 +2,7 @@
* ecc-mont.c - Elliptic curve computation for
* the Montgomery curve: y^2 = x^3 + 486662*x^2 + x.
*
* Copyright (C) 2014, 2015, 2017 Free Software Initiative of Japan
* Copyright (C) 2014, 2015, 2017, 2021 Free Software Initiative of Japan
* Author: NIIBE Yutaka <gniibe@fsij.org>
*
* This file is a part of Gnuk, a GnuPG USB Token implementation.
@ -202,12 +202,14 @@ ecdh_compute_public_25519 (const uint8_t *key_data, uint8_t *pubkey)
{
bn256 gx[1];
bn256 k[1];
bn256 pk[1];
memset (gx, 0, sizeof (bn256));
gx[0].word[0] = 9; /* Gx = 9 */
memcpy (k, key_data, sizeof (bn256));
compute_nQ ((bn256 *)pubkey, k, gx);
compute_nQ (pk, k, gx);
memcpy (pubkey, pk, sizeof (bn256));
}
int