srp.js

// Register on client side
var verifier = srp.computeVerifier(params, salt, identity, password);
createAccount(identity, verifier);

// Login
// Generate A on client side
srp.genKey(function(secret1) {
    var c = new srp.Client(params, salt, identity, password, secret1);
    var srpA = c.computeA();
    sendToServer(srpA);
});

// Generate B on server side 
srp.genKey(function(secret2) {
    var s = new srp.Server(params, verifier, secret2);
    var srpB = s.computeB();
    sendToClient(srpB);
});

// Generate session key K & send M1 to server on client side
c.setB(srpB);
var M1 = c.computeM1();
sendToServer(M1);
var K = c.computeK();

// Generate session key K & verify client on server side
s.setA(srpA)
s.checkM1(M1); // throws error if wrong
var K = s.computeK();