From 169e26ba4facb637831aaaa02d878b988a090ff0 Mon Sep 17 00:00:00 2001
From: Hans Nilsson <hans@erlang.org>
Date: Wed, 2 May 2018 14:44:52 +0200
Subject: ssh: Fix DH group exchange server bug for PuTTY and others following
 draft-draft-00 from 2001 and not the rfc4419

---
 lib/ssh/src/ssh_transport.erl | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index 975053d301..edc927e807 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -1839,9 +1839,10 @@ kex_alg_dependent({E, F, K}) ->
     %% diffie-hellman and ec diffie-hellman (with E = Q_c, F = Q_s)
     <<?Empint(E), ?Empint(F), ?Empint(K)>>;
 
-kex_alg_dependent({-1, _, -1, _, _, E, F, K}) ->
+kex_alg_dependent({-1, NBits, -1, Prime, Gen, E, F, K}) ->
     %% ssh_msg_kex_dh_gex_request_old
-    <<?Empint(E), ?Empint(F), ?Empint(K)>>;
+    <<?Euint32(NBits),
+      ?Empint(Prime), ?Empint(Gen), ?Empint(E), ?Empint(F), ?Empint(K)>>;
 
 kex_alg_dependent({Min, NBits, Max, Prime, Gen, E, F, K}) ->
     %% diffie-hellman group exchange
-- 
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