I believe you need one of the following licenses packages to activate crypto functionality:
◦ Cisco ASR 1000 Advanced IP Services license
◦ Cisco ASR 1000 Advanced Services license
If you have purchases one of these packages, you can activate the PAK on and install the license on the router.
There should also be a license that can enable only the ipsec feature set on the ASR if you do not want all the Security features.
The information of the licenses is present in the ASR ordering guide:
http://www.cisco.com/c/en/us/products/collateral/routers/asr-1000-series-aggregation-services-routers/guide-c07-731639.html#_Toc462044517
The guide is super confusing for someone reading it for the first time :)
This datasheet may be more useful:
http://www.cisco.com/c/dam/en/us/products/collateral/routers/asr-1000-series-aggregation-services-routers/q-and-a-c67-452124.pdf