key.java

bytes = null;
 // look for the Base64 encoded part of the line to decode
 // both ssh-rsa and ssh-dss begin with "AAAA" due to the length bytes
 for (String part : keyLine.split(" ")) {
   if (part.startsWith("AAAA")) {
     bytes = Base64.decodeBase64(part);
     break;
   }
}
if (bytes == null) throw new IllegalArgumentException("no Base64 part to decode");