From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date: Wed, 11 Jan 2012 02:01:43 +0000 (+0100)
Subject: corrected issue in ECDH key generation.
X-Git-Tag: gnutls-3_0_12~50
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=388524a37dbc278a697e543bd24260679ff3858f;p=thirdparty%2Fgnutls.git

corrected issue in ECDH key generation.
This issue prevented an ECDH key that was smaller than the
prime from being correctly aligned.
---

diff --git a/lib/nettle/ecc_shared_secret.c b/lib/nettle/ecc_shared_secret.c
index 46a0793bc8..4e3ef358e1 100644
--- a/lib/nettle/ecc_shared_secret.c
+++ b/lib/nettle/ecc_shared_secret.c
@@ -76,8 +76,7 @@ ecc_shared_secret (ecc_key * private_key, ecc_key * public_key,
       err = -1;
       goto done;
     }
-  memset (out, 0, x);
-  nettle_mpz_get_str_256(x, out + (x - nettle_mpz_sizeinbase_256_u (result->x)), result->x);
+  nettle_mpz_get_str_256(x, out, result->x);
 
   err = 0;
   *outlen = x;