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var srp_N = null;
var srp_Nstr = "115b8b692e0e045692cf280b436735c77a5a9e8a9e7ed56c965f87db5b2a2ece3";
var srp_g = null;
var srp_k = null;
var srp_a = null;
var srp_A = null;
var srp_Astr = null;
var srp_b = null;
var srp_B = null;
var srp_Bstr = null;
var srp_I = null;
var srp_u = null;
var srp_p = null;
var srp_x = null;
var srp_S = null;
var srp_K = null;
var srp_M = null;
var srp_M2 = null;
var xhr;
var rng;
var srp_url = window.location.protocol+"//"+window.location.host+"/srp/";
function srp_register()
{
srp_N = new BigInteger(srp_Nstr, 16);
srp_g = new BigInteger("2");
srp_k = new BigInteger("c46d46600d87fef149bd79b81119842f3c20241fda67d06ef412d8f6d9479c58", 16);
srp_I = document.getElementById("srp_username").value;
srp_register_salt(srp_I);
return false;
};
function srp_register_salt(I)
{
if( window.XMLHttpRequest)
xhr = new XMLHttpRequest();
else if (window.ActiveXObject){
try{
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){}
}
else
{
srp_error_message("Ajax not supported.");
return;
}
if(xhr){
var srp_handshake_url = srp_url + "register/salt/";
var srp_params = "I="+I;
xhr.onreadystatechange = srp_register_receive_salt;
xhr.open("POST", srp_handshake_url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.setRequestHeader("Content-length", srp_params.length);
xhr.setRequestHeader("Connection", "close");
xhr.send(srp_params);
}
else
{
srp_error_message("Ajax failed.");
}
};
function srp_register_receive_salt()
{
if(xhr.readyState == 4 && xhr.status == 200) {
if(xhr.responseXML.getElementsByTagName("salt").length > 0)
{
s = innerxml(xhr.responseXML.getElementsByTagName("salt")[0]);
srp_x = srp_calculate_x(s);
v = srp_g.modPow(srp_x, srp_N);
srp_register_send_verifier(v.toString(16));
}
else if(xhr.responseXML.getElementsByTagName("error").length > 0)
{
srp_error_message(innerxml(xhr.responseXML.getElementsByTagName("error")[0]));
}
}
};
function srp_register_send_verifier(v)
{
if( window.XMLHttpRequest)
xhr = new XMLHttpRequest();
else if (window.ActiveXObject){
try{
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){}
}
else
{
srp_error_message("Ajax not supported.");
return;
}
if(xhr){
var srp_params = "v="+v;
var srp_auth_url = srp_url+ "register/user/";
xhr.onreadystatechange = srp_register_user;
xhr.open("POST", srp_auth_url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.setRequestHeader("Content-length", srp_params.length);
xhr.setRequestHeader("Connection", "close");
xhr.send(srp_params);
}
else
{
srp_error_message("Ajax failed.");
}
};
function srp_register_user()
{
if(xhr.readyState == 4 && xhr.status == 200) {
if(xhr.responseXML.getElementsByTagName("ok").length > 0)
{
srp_identify();
}
}
};
function srp_identify()
{
srp_N = new BigInteger(srp_Nstr, 16);
srp_g = new BigInteger("2");
srp_k = new BigInteger("c46d46600d87fef149bd79b81119842f3c20241fda67d06ef412d8f6d9479c58", 16);
rng = new SecureRandom();
srp_a = new BigInteger(32, rng);
// A = g**a % N
srp_A = srp_g.modPow(srp_a, srp_N);
srp_I = document.getElementById("srp_username").value;
srp_Astr = srp_A.toString(16);
// C -> S: A | I
srp_send_identity(srp_Astr, srp_I);
return false;
};
function srp_send_identity(Astr, I)
{
if( window.XMLHttpRequest)
xhr = new XMLHttpRequest();
else if (window.ActiveXObject){
try{
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){}
}
else
{
srp_error_message("Ajax not supported.");
return;
}
if(xhr){
var srp_handshake_url = srp_url + "handshake/";
var srp_params = "I="+I+"&A="+Astr;
xhr.onreadystatechange = srp_receive_salts;
xhr.open("POST", srp_handshake_url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.setRequestHeader("Content-length", srp_params.length);
xhr.setRequestHeader("Connection", "close");
xhr.send(srp_params);
}
else
{
srp_error_message("Ajax failed.");
}
};
function srp_receive_salts()
{
if(xhr.readyState == 4 && xhr.status == 200) {
if(xhr.responseXML.getElementsByTagName("r").length > 0)
{
response = xhr.responseXML.getElementsByTagName("r")[0];
srp_calculations(response.getAttribute("s"), response.getAttribute("B"));
}
else if(xhr.responseXML.getElementsByTagName("error").length > 0)
{
// This probably means A % N == 0, which means we need to generate
// a new A and reidentify.
srp_identify();
}
}
};
function srp_calculate_x(s)
{
var p = document.getElementById("srp_password").value;
return new BigInteger(SHA256(s + SHA256(srp_I + ":" + p)), 16);
};
function srp_calculations(s, B)
{
//S -> C: s | B
srp_B = new BigInteger(B, 16);
srp_Bstr = B;
// u = H(A,B)
srp_u = new BigInteger(SHA256(srp_Astr + srp_Bstr), 16);
// x = H(s, H(I:p))
srp_x = srp_calculate_x(s);
//S = (B - kg^x) ^ (a + ux)
var kgx = srp_k.multiply(srp_g.modPow(srp_x, srp_N));
var aux = srp_a.add(srp_u.multiply(srp_x));
srp_S = srp_B.subtract(kgx).modPow(aux, srp_N);
// M = H(H(N) xor H(g), H(I), s, A, B, K)
var Mstr = srp_A.toString(16) + srp_B.toString(16) + srp_S.toString(16);
srp_M = SHA256(Mstr);
srp_send_hash(srp_M);
//M2 = H(A, M, K)
srp_M2 = SHA256(srp_A.toString(16) + srp_M + srp_S.toString(16));
};
function srp_send_hash(M)
{
if( window.XMLHttpRequest)
xhr = new XMLHttpRequest();
else if (window.ActiveXObject){
try{
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){}
}
else
{
srp_error_message("Ajax not supported.");
return;
}
if(xhr){
var srp_params = "M="+M;
var srp_auth_url = srp_url+ "authenticate/";
xhr.onreadystatechange = srp_confirm_authentication;
xhr.open("POST", srp_auth_url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.setRequestHeader("Content-length", srp_params.length);
xhr.setRequestHeader("Connection", "close");
xhr.send(srp_params);
}
else
{
srp_error_message("Ajax failed.");
}
};
function srp_confirm_authentication()
{
if(xhr.readyState == 4 && xhr.status == 200) {
if(xhr.responseXML.getElementsByTagName("M").length > 0)
{
if(innerxml(xhr.responseXML.getElementsByTagName("M")[0]) == srp_M2)
srp_success();
else
srp_error_message("Server key does not match");
}
else if (xhr.responseXML.getElementsByTagName("error").length > 0)
{
srp_error_message(innerxml(xhr.responseXML.getElementsByTagName("error")[0]));
}
}
};
function innerxml (node)
{
return node.firstChild.nodeValue;
};
function srp_error_message(t)
{
alert(t);
};
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