From 0a56c2c6984cf62cb6408c002a2ff1ab7b542138 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20P=C3=A9gouri=C3=A9-Gonnard?= <mpg@elzevir.fr>
Date: Fri, 17 Jan 2014 21:24:04 +0100
Subject: [PATCH] Fix bug in ecdh_calc_secret()

Only affects curves with nbits != pbits (currently only secp224k1)
---
 library/ecdh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/ecdh.c b/library/ecdh.c
index 302531db8..ebc167674 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -246,7 +246,7 @@ int ecdh_calc_secret( ecdh_context *ctx, size_t *olen,
     if( mpi_size( &ctx->z ) > blen )
         return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
 
-    *olen = ctx->grp.nbits / 8 + ( ( ctx->grp.nbits % 8 ) != 0 );
+    *olen = ctx->grp.pbits / 8 + ( ( ctx->grp.pbits % 8 ) != 0 );
     return mpi_write_binary( &ctx->z, buf, *olen );
 }