4a67c19118
This adds the OpenSSH HMACs that do encrypt then mac. This is a more secure mode than the original HMAC. Newer AEAD ciphers like chacha20 and AES-GCM are already encrypt-then-mac, but this also adds it for older legacy clients that don't support those ciphers yet. Signed-off-by: Dirkjan Bussink <d.bussink@gmail.com> Reviewed-by: Jon Simons <jon@jonsimons.org> Reviewed-by: Jakub Jelen <jjelen@redhat.com>