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ban all-zero curve25519 keys as recommended by latest
 CFRG curves draft; ok markus
This commit is contained in:
djm@openbsd.org 2015-03-26 07:00:04 +00:00 committed by Damien Miller
parent b8afbe2c1a
commit f9b7885237
1 changed files with 6 additions and 1 deletions
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7
kexc25519.c
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@ -1,4 +1,4 @@
/* $OpenBSD: kexc25519.c,v 1.8 2015/01/19 20:16:15 markus Exp $ */
/* $OpenBSD: kexc25519.c,v 1.9 2015/03/26 07:00:04 djm Exp $ */
/*
* Copyright (c) 2001, 2013 Markus Friedl. All rights reserved.
* Copyright (c) 2010 Damien Miller. All rights reserved.
@ -66,6 +66,11 @@ kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
u_char shared_key[CURVE25519_SIZE];
int r;
/* Check for all-zero public key */
explicit_bzero(shared_key, CURVE25519_SIZE);
if (timingsafe_bcmp(pub, shared_key, CURVE25519_SIZE) == 0)
return SSH_ERR_KEY_INVALID_EC_VALUE;
crypto_scalarmult_curve25519(shared_key, key, pub);
#ifdef DEBUG_KEXECDH
dump_digest("shared secret", shared_key, CURVE25519_SIZE);