The project will be built by the country's National e-Governance Division, and the file access solution from the Germany-based open-source file syncing and sharing software company ownCloud will play a central role.
DigiLocker is a key project under the Digital India Initiative.
India has a national system for authentication called Aadhaar and people have a unique ID for registering, after which all official documents issued — such as birth certificates, driver's licences and educational certificates — are automatically issued as digitally signed PDFs.
The documents can be accessed over virtually any Web-enabled device and there is an Android app available for this purpose.
More than two million people have connected to DigiLocker and the database holds nearly 42 million documents. The government wants 50 million Indians to use the repository within three years of going live.
India has the world's second largest population with about 1.1 billion legal residents. There are also a large number of illegals, both from neighbouring countries and further afield. There are also many people who have overstayed their visas and simply merged into the background.
The release quoted DigiLocker director Debabrata Nayak as saying: "Regardless of their education and status, DigiLocker lets every Indian citizen securely and centrally store documents that are essential to their life. By combining DigiLocker with our Aadhaar system, we have created a model for paperless delivery of eGovernance services.
"ownCloud forms a key component of this, because it allows you to add existing documents, thus transforming DigiLocker into a single comprehensive collection point for personal documents."
Registered users have automatic access to ownCloud and can upload documents themselves, updating on an ongoing basis.
ownCloud's chief operating officer Holger Dryoff said: "The DigiLocker project illustrates clearly how scalable and powerful our platform is. And more than anything else, it is very easy to use.
"Some 150 usable and customisable ownCloud apps are available directly for download. By deciding to rely on open source and focus on strong in-house development, the government of India has set the course for a project with a long-term focus, which, in my view, could also be a model for other countries."