How to install mcrypt for PHP 5.3.3 on CentOS

I installed php 5.3 and some modules using

yum install php53-{module-name} 

But mcrypt did not work.

I searched like this:

yum list php* | grep mcry 

The only package that came up was

php-mcrypt.x86-64 5.1.6-15.e15.centos.1 extras 

I have the same exact problem with mhash. The results for php are even more confusing.

I know this is probably a dumb question, but any help would be appreciated. I am used to Ubuntu's simple "apt-get install" and everything works. CentOS seems to be a lot more detail oriented.

Thanks.

EDIT: Here's what I tried:

yum install php53-mcrypt 

Result:

No package php53-mcrypt available 

And trying this:

yum install php-mcrypt 

Results in:

Error: php53-common conflicts with php-common 

Because php-mcrypt tries to get php-common as a dependency (?) and I am trying to use php 5.3 rather than the default php 5.1 on CentOS 5.7.