Issue #3247358: Add support for security key backed SSH key types

sshkey.module

@@ -490,6 +490,7 @@ function sshkey_parse($key_raw) {
     'ssh-rsa',
     'ssh-dss',
     'ssh-ed25519',
+    'sk-ssh-ed25519',
   ]);
   if (!in_array($parsed['algorithm'], $algorithms)) {
     // Produces a string like "ssh-rsa, ssh-dss, or ssh-ed25519".
@@ -596,8 +597,10 @@ function sshkey_clean_whitespace($key_raw) {
     'ssh-dss' => 5,
     // https://tools.ietf.org/html/draft-bjh21-ssh-ed25519-02#section-4
     'ssh-ed25519' => 2,
+    'sk-ssh-ed25519' => 2,
     // https://tools.ietf.org/html/rfc5656#section-3.1
     'ecdsa-sha2-nistp256' => 3,
+    'sk-ecdsa-sha2-nistp256' => 3,
     'ecdsa-sha2-nistp384' => 3,
     'ecdsa-sha2-nistp521' => 3,
   ];