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Diffstat (limited to 'src/srp.js')
| -rw-r--r-- | src/srp.js | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/src/srp.js b/src/srp.js deleted file mode 100644 index 6af54ea..0000000 --- a/src/srp.js +++ /dev/null @@ -1,386 +0,0 @@ -function SRP() -{ - // Variables that will be used in the SRP protocol - var Nstr = "115b8b692e0e045692cf280b436735c77a5a9e8a9e7ed56c965f87db5b2a2ece3"; - var N = new BigInteger(Nstr, 16); - var g = new BigInteger("2"); - var k = new BigInteger("c46d46600d87fef149bd79b81119842f3c20241fda67d06ef412d8f6d9479c58", 16); - var rng = new SecureRandom(); - var a = new BigInteger(32, rng); - var A = g.modPow(a, N); - while(A.mod(N) == 0) - { - a = new BigInteger(32, rng); - A = g.modPow(a, N); - } - var Astr = A.toString(16); - var S = null; - var K = null; - var M = null; - var M2 = null; - var url = document.getElementById("srp_url").value; - var server = document.getElementById("srp_server").value; - var that = this; - var authenticated = false; - var I = document.getElementById("srp_username").value; - var p = document.getElementById("srp_password").value; - var xhr = null; - - // *** Accessor methods *** - - // allows setting the random number A for testing - - this.calculateAndSetA = function(_a) - { - a = new BigInteger(_a, 16); - A = g.modPow(a, N); - Astr = A.toString(16); - return Astr; - }; - - // Returns the user's identity - this.getI = function() - { - return I; - }; - - // Returns the XMLHttpRequest object - this.getxhr = function() - { - return xhr; - }; - - // Returns the base URL - this.geturl = function() - { - return url; - }; - // Returns the BigInteger, g - this.getg = function() - { - return g; - }; - - // Returns the BigInteger, N - this.getN = function() - { - return N; - }; - - // Calculates the X value and return it as a BigInteger - this.calcX = function(s) - { - return new BigInteger(SHA256(s + SHA256(I + ":" + p)), 16); - }; - - // Translates the django path to PHP and ASP.NET paths - this.paths = function(str) - { - // For now, str will be the django path - // This function will translate for other backends. - if(server == "django") - { - return str; - } - }; - - // Check whether or not a variable is defined - function isdefined ( variable) - { - return (typeof(window[variable]) != "undefined"); - }; - - // *** Actions *** - - // Perform ajax requests at the specified url, with the specified parameters - // Calling back the specified function. - this.ajaxRequest = function(full_url, params, callback) - { - if( window.XMLHttpRequest) - xhr = new XMLHttpRequest(); - else if (window.ActiveXObject){ - try{ - xhr = new ActiveXObject("Microsoft.XMLHTTP"); - }catch (e){} - } - else - { - that.error_message("Ajax not supported."); - return; - } - if(xhr){ - xhr.onreadystatechange = function() { - if(xhr.readyState == 4 && xhr.status == 200) { - callback(parseResponse()); - } - }; - xhr.open("POST", full_url, true); - xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); - xhr.setRequestHeader("Content-length", params.length); - xhr.send(params); - } - else - { - that.error_message("Ajax failed."); - } - }; - - function parseResponse() { - if (responseIsXML()) { - return parseXML(xhr.responseXML); - } else if (responseIsJSON()) { - return JSON.parse(xhr.responseText); - } - }; - - function responseIsXML() { - return (xhr.responseType == 'document') || - (xhr.getResponseHeader("Content-Type").indexOf('application/xml') >= 0) - } - - function responseIsJSON() { - return (xhr.responseType == 'json') || - (xhr.getResponseHeader("Content-Type").indexOf('application/json') >= 0) - } - - function parseXML(xml) { - if (xml.getElementsByTagName("r").length > 0) { - return parseAttributesOfElement(xml.getElementsByTagName("r")[0]); - } else { - return parseNodes(xml.childNodes); - } - }; - - function parseAttributesOfElement(elem) { - var response = {}; - for (var i = 0; i < elem.attributes.length; i++) { - var attrib = elem.attributes[i]; - if (attrib.specified) { - response[attrib.name] = attrib.value; - } - } - return response; - }; - - function parseNodes(nodes) { - var response = {}; - for (var i = 0; i < nodes.length; i++) { - var node = nodes[i]; - response[node.tagName] = node.textContent || true; - } - return response; - }; - - // Start the login process by identifying the user - this.identify = function() - { - var handshake_url = url + that.paths("handshake/"); - var params = "I="+I+"&A="+Astr; - that.ajaxRequest(handshake_url, params, receive_salts); - }; - - // Receive login salts from the server, start calculations - function receive_salts(response) - { - if(response.error) { - that.error_message(response.error); - } - // B = 0 will make the algorithm always succeed - refuse such a server - // answer - else if(response.B == 0) { - that.error_message("Server send random number 0 - this is not allowed"); - } - // If there is no algorithm specified, calculate M given s, B, and P - else if(!response.a) - { - calculations(response.s, response.B, p); - that.ajaxRequest(url+that.paths("authenticate/"), "M="+M, confirm_authentication); - } - // If there is an algorithm specified, start the login process - else { - upgrade(response.s, response.B, response.a, response.d); - } - }; - // Calculate S, M, and M2 - // This is the client side of the SRP specification - function calculations(s, ephemeral, pass) - { - //S -> C: s | B - var B = new BigInteger(ephemeral, 16); - var Bstr = ephemeral; - // u = H(A,B) - var u = new BigInteger(SHA256(Astr + Bstr), 16); - // x = H(s, H(I:p)) - var x = new BigInteger(SHA256(s + SHA256(I + ":" + pass)), 16); - //S = (B - kg^x) ^ (a + ux) - var kgx = k.multiply(g.modPow(x, N)); - var aux = a.add(u.multiply(x)); - S = B.subtract(kgx).modPow(aux, N); - // M = H(H(N) xor H(g), H(I), s, A, B, K) - var Mstr = A.toString(16) + B.toString(16) + S.toString(16); - M = SHA256(Mstr); - M2 = SHA256(A.toString(16) + M + S.toString(16)); - //M2 = H(A, M, K) - }; - - // Receive M2 from the server and verify it - function confirm_authentication(response) - { - if(response.M) - { - if(response.M == M2) - { - authenticated = true; - that.success(); - } - else - that.error_message("Server key does not match"); - } - else if (response.error) - that.error_message(response.error); - }; - - // *** Upgrades *** - - // Start the process to upgrade the user's account - function upgrade(s,ephemeral,algo,dsalt) - { - // First we need to import the hash functions - import_hashes(); - - // Once the hash functions are imported, do the calculations using the hashpass as the password - function do_upgrade() - { - // If sha1 and md5 are still undefined, sleep again - if(!isdefined("SHA1") || !isdefined("MD5")) - { - window.setTimeout(do_upgrade, 10); - return; - } - if(algo == "sha1") - hashfun = SHA1; - else if(algo == "md5") - hashfun = MD5; - //alert(hashfun(dsalt+p)); - calculations(s, ephemeral, hashfun(dsalt+p)); - that.ajaxRequest(url+that.paths("upgrade/authenticate/"), "M="+M, confirm_upgrade); - }; - window.setTimeout(do_upgrade,10); - }; - - // Encrypt plaintext using slowAES - function encrypt(plaintext) - { - var key = cryptoHelpers.toNumbers(that.key()); - var byteMessage = cryptoHelpers.convertStringToByteArray(plaintext); - var iv = new Array(16); - rng.nextBytes(iv); - var paddedByteMessage = slowAES.getPaddedBlock(byteMessage, 0, byteMessage.length, slowAES.modeOfOperation.CFB); - var ciphertext = slowAES.encrypt(paddedByteMessage, slowAES.modeOfOperation.CFB, key, key.length, iv).cipher; - var retstring = cryptoHelpers.base64.encode(iv.concat(ciphertext)); - while(retstring.indexOf("+",0) > -1) - retstring = retstring.replace("+", "_"); - return retstring; - }; - - // Receive the server's M, confirming that the server has HASH(p) - // Next, send P in plaintext (this is the **only** time it should ever be sent plain text) - function confirm_upgrade(response) - { - if(response.M) - { - if(response.M == M2) - { - K = SHA256(S.toString(16)); - var auth_url = url + that.paths("upgrade/verifier/"); - that.ajaxRequest(auth_url, "p="+encrypt(p)+"&l="+p.length, confirm_verifier); - } - else - that.error_message("Server key does not match"); - } - else if (response.error) - { - that.error_message(response.error); - } - }; - - // After sending the password, check that the response is OK, then reidentify - function confirm_verifier(response) - { - K = null; - if(response.ok) - that.identify(); - else - that.error_message("Verifier could not be confirmed"); - }; - - // This loads javascript libraries. Fname is the path to the library to be imported - function import_file(fname) - { - var scriptElt = document.createElement('script'); - scriptElt.type = 'text/javascript'; - scriptElt.src = fname; - document.getElementsByTagName('head')[0].appendChild(scriptElt); - }; - // If we need SHA1 or MD5, we need to load the javascript files - function import_hashes() - { - // First check that the functions aren't already loaded - if(isdefined("SHA1") && isdefined("MD5")) return; - // Get the directory that this javascript file was loaded from - var arr=that.srpPath.split("/"); - var path = arr.slice(0, arr.length-1).join("/"); - // If this file is called srp.min.js, we will load the packed hash file - if(arr[arr.length-1] == "srp.min.js") - import_file(path+"/crypto.min.js"); - // Otherwise, this file is presumably srp.js, and we will load individual hash files - else - { - import_file(path+"/MD5.js"); - import_file(path+"/SHA1.js"); - import_file(path+"/cryptoHelpers.js"); - import_file(path+"/aes.js"); - } - } - - // This function is called when authentication is successful. - // Developers can set this to other functions in specific implementations - // and change the functionality. - this.success = function() - { - var forward_url = document.getElementById("srp_forward").value; - if(forward_url.charAt(0) != "#") - window.location = forward_url; - else - { - window.location = forward_url; - alert("Login successful."); - } - }; - // If someone wants to use the session key for encrypting traffic, they can - // access the key with this function. - this.key = function() - { - if(K == null) - if(authenticated) - { - K = SHA256(S.toString(16)); - return K; - } - else - that.error_message("User has not been authenticated."); - else - return K; - }; - - // If an error occurs, raise it as an alert. - // Developers can set this to an alternative function to handle erros differently. - this.error_message = function(t) - { - alert(t); - }; - }; - // This line is run while the document is loading - // It gets a list of all <script> tags and finds the last instance. - // The path to this script is the "src" attribute of that tag. - SRP.prototype.srpPath = document.getElementsByTagName('script')[document.getElementsByTagName('script').length-1].getAttribute("src"); |