Installation fails with PHP error message

Hello!

I’m trying to install Revolution 2.1.1 and the installation fails with PHP error message:

Fatal error: Call to undefined function hash() in /home/****/docs/core/model/modx/hashing/modpbkdf2.class.php on line 34

Does anybody know, what is it and how to fix it?

PHP 5.2.10

Looks as though you have no inbuilt hash function, but looking at your PHP version you should, from the manual :-

The Hash extension requires no external libraries and is enabled by default as of PHP 5.1.2. It may be explicitly disabled by using the --disable-hash switch to configure. Earlier versions of PHP may incorporate the Hash extension by installing the » PECL module.

What switches does your PHP info list? You may have to install it from PECL.

Thank you!