The srptool is a very simple program that emulates the programs in the Stanford SRP libraries. It is intended for use in places where you don't expect SRP authentication to be the used for system users. Traditionally libsrp used two files. One called 'tpasswd' which holds usernames and verifiers, and 'tpasswd.conf' which holds generators and primes.
How to use srptool:
$ srptool --create-conf /etc/tpasswd.conf
$ srptool --passwd /etc/tpasswd \ --passwd-conf /etc/tpasswd.conf -u test
$ srptool --passwd /etc/tpasswd \ --passwd-conf /etc/tpasswd.conf --verify -u test