Why can't I use an OpenSSL key pair with ecryptfs?

According to documentation, I simply create a public/private keypair for ecryptfs using ecryptfs-manager. But there is nothing to select.

$ sudo ecryptfs-manager
eCryptfs key management menu
-------------------------------
    1. Add passphrase key to keyring
    2. Add public key to keyring
    3. Generate new public/private keypair
    4. Exit

Make selection: 3
Select key type to use for newly created files: 
Selection: 

There should at least one option for me to select, sorta like this:

Make selection: 3
Select key type to use for newly created files: 
    1. OpenSSL
    2. Probably some other option here
Selection: 

I am using Ubuntu 11.10 (with Xubuntu-desktop). I have all relevant packages AFAIK like ecryptfs-utils, openssl, keyutils. What am I missing?

Although I can create a key pair using openssl like so (I am not sure this is right for use with ecryptfs):

$ openssl genrsa -out rsakey.pem -aes256 2048
Generating RSA private key, 2048 bit long modulus
(...)
Enter pass phrase for rs-efs-rsakey.pem:
Verifying - Enter pass phrase for rs-efs-rsakey.pem:
$ openssl rsa -in rsakey.pem -out rsapub.pem -pubout
Enter pass phrase for rsakey.pem:
writing RSA key

There is still a problem with ecryptfs because just like ecryptfs-manager, mount -t ecryptfs also misses the option to choose for keys.

When I mount something random, I get:

$ sudo mount -t ecryptfs ~/temp ~/temp
[sudo] password for redsandro: 
Passphrase:

It immediately assumes I want to use password encryption. What I should have gotten is something like this:

$ sudo mount -t ecryptfs ~/temp ~/temp
[sudo] password for redsandro: 
Select key type to use for newly created files:
    1) openssl
    2) passphrase
    3) tspi
Selection:

I am guessing the same [something] is missing for ecryptfs-manager and mount, because the same question is present in documentation. What am I missing?