Author: Daniel Baumann <daniel.baumann@progress-linux.org>
Description: Setting KexAlgorithms in ssh_config to Curve25519 and Diffie-Hellman.

diff -Naurp openssh.orig/ssh_config openssh/ssh_config
--- openssh.orig/ssh_config
+++ openssh/ssh_config
@@ -42,6 +42,7 @@ Host *
 #   Protocol 2
     CASignatureAlgorithms ssh-ed25519,rsa-sha2-512,rsa-sha2-256
     Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
+    KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group18-sha512,diffie-hellman-group16-sha512,diffie-hellman-group14-sha256,diffie-hellman-group-exchange-sha256
 #   MACs hmac-md5,hmac-sha1,umac-64@openssh.com
 #   EscapeChar ~
 #   Tunnel no