A320 Air carrier First Officer aircraft reported Hydraulic System Malfunction on descent.

Narrative

We were in our initial descent into ZZZ when we received an ECAM for a GRN HYD ENG 1 LO PR. We had fault lights illuminated on the GEN ENG 1 and PTU (Power Transfer Unit) switch. We ran the ECAM which directed us to switch both the GRN ENG 1 and PTU off. The status page listed all the inoperative systems. It also stated that we should attempt to restore GRN ENG 1 to extend the gear and if unable a gravity extension would be required. We then referenced the FM non-normals for review; reviewed the gravity extension and computed the landing distance required. The Captain [advised] Center and requested direct ZZZ. We had XXX [passengers and crew] and around 1:45 minutes of [fuel]. Next the Captain made contact with my Dispatcher through ARINC. He explained the situation and his intentions to land at ZZZ1. We set the aircraft up for a 20 nm final; turned the GRN ENG 1 pump back on and selected gear down. The gear extension was slower than normal but we did receive a 3 GREEN and locked indication. The GRN ENG 1 was switched back off. We touched down in the first 1000 ft. of XXL and came to a stop with 1500 ft. remaining. We ran an after landing flow; then referenced the FM Supplementary section for Tow-in procedures. After shutting down the engines the Fire department informed us we were leaking hydraulic fluid out of the nose wheel area. End of incident; the Captain notified all required authorities.