The RSA Keys path in asterisk.conf is wrong, now it is:
astkeydir => /etc/asterisk/keys 
A strange logic exists in the asterisk code so using the value above the directory expected will be /etc/asterisk/keys/keys... but key files are in the literal path.
So it must be:
astkeydir => /etc/asteriskUsers that needs RSA auth keys for any reason can
append this re-configuration piece to asterisk.conf via the developer panel:
[directories](+)
astkeydir => /etc/asteriskAlso a module needed for keys handling isn't loaded in the default configuration, until a future version that fixes that issue will be released you can append this to modules.conf if auth via rsa keys for iax providers is needed:
load => res_crypto.soA reboot is suggested, sometimes "keys init" or reloading asterisk won't work.
Both fixed in svn a few minutes ago.