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-rw-r--r--javascript/srp.js262
1 files changed, 262 insertions, 0 deletions
diff --git a/javascript/srp.js b/javascript/srp.js
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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 srp_url = window.location.protocol+"//"+window.location.host+"/srp/";
+function srp_register()
+{
+ srp_N = str2bigInt(srp_Nstr, 16, 0);
+ srp_g = str2bigInt("2", 10, 0);
+ srp_k = str2bigInt("c46d46600d87fef149bd79b81119842f3c20241fda67d06ef412d8f6d9479c58", 16, 0);
+ 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 = powMod(srp_g, srp_x, srp_N);
+ srp_register_send_verifier(bigInt2str(v, 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 = str2bigInt(srp_Nstr, 16, 0);
+ srp_g = str2bigInt("2", 10, 0);
+ srp_k = str2bigInt("c46d46600d87fef149bd79b81119842f3c20241fda67d06ef412d8f6d9479c58", 16, 0);
+ srp_a = randBigInt(32, 1);
+ // A = g**a % N
+ srp_A = powMod(srp_g,srp_a,srp_N);
+ srp_I = document.getElementById("srp_username").value;
+
+ srp_Astr = bigInt2str(srp_A, 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 str2bigInt(SHA256(s + SHA256(srp_I + ":" + p)), 16, 0);
+};
+
+function srp_calculations(s, B)
+{
+
+ //S -> C: s | B
+ srp_B = str2bigInt(B, 16, 0);
+ srp_Bstr = B;
+ // u = H(A,B)
+ srp_u = str2bigInt(SHA256(srp_Astr + srp_Bstr), 16, 0);
+ // x = H(s, H(I:p))
+ srp_x = srp_calculate_x(s);
+ //S = (B - kg^x) ^ (a + ux)
+ var kgx = mult(srp_k, powMod(srp_g, srp_x, srp_N));
+ var aux = add(srp_a, mult(srp_u, srp_x));
+ srp_S = powMod(sub(srp_B, kgx), aux, srp_N);
+ // M = H(H(N) xor H(g), H(I), s, A, B, K)
+ var Mstr = bigInt2str(srp_A, 16) + bigInt2str(srp_B,16) + bigInt2str(srp_S,16);
+ srp_M = SHA256(Mstr);
+ srp_send_hash(srp_M);
+ //M2 = H(A, M, K)
+ srp_M2 = SHA256(bigInt2str(srp_A, 16)+srp_M+bigInt2str(srp_S, 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);
+};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-06 10:41:16 +0000