Fatal error: Call to undefined function openssl_random_pseudo_bytes()

Your version of PHP wasn't compiled with the openssl module. If you are building from source, add the module like so:

cd /path/to/php-5.4/
./configure --with-openssl

Your php installation either does not have openssl enabled, or you could be running a version of php < 5.3.

To enable openssl, you must re-compile and install php with the "–with-openssl" flag. See php installation documentation