Yes, we support the pgcrypto module, which provides cryptographic functions for PostgreSQL. It is not installed by default, but we can install it for you on shared, reseller, and managed dedicated servers by request. To do this, please open a support ticket with our Guru Crew at https://my.a2hosting.com. Please include in your ticket the names of the PostgreSQL databases that you want to use with the pgcrypto module.
Of course, you can install the pgcrypto module yourself on our unmanaged products.
For more information about the pgcrypto module for PostgreSQL, please visit http://www.postgresql.org/docs/9.1/static/pgcrypto.html.