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HMAC-SHA256 example for verifying both the data integrity and the authentication of a request in Node.js and web browsers.
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>HMAC-SHA256 Example</title> | |
| </head> | |
| <body> | |
| <script src="http://crypto.stanford.edu/sjcl/sjcl.js"></script> | |
| <script> | |
| var sharedSecret, query, signature, hmac, xhr; | |
| // No longer secret shared secret ;-) | |
| sharedSecret = "super-secret"; | |
| query = "key=value"; | |
| hmac = new sjcl.misc.hmac(sjcl.codec.utf8String.toBits(sharedSecret), sjcl.hash.sha256); | |
| signature = sjcl.codec.hex.fromBits(hmac.encrypt(query)); | |
| xhr = new XMLHttpRequest(); | |
| xhr.open("GET", "http://localhost:1337/?" + query); | |
| xhr.setRequestHeader("X-Signature", signature); | |
| xhr.onload = function () { | |
| console.log(xhr.status, xhr.responseText); | |
| } | |
| xhr.send(null); | |
| </script> | |
| </body> | |
| </html> |
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| var http, crypto, sharedSecret, query, signature; | |
| http = require("http"); | |
| crypto = require("crypto"); | |
| sharedSecret = "super-secret"; | |
| query = "key=value"; | |
| signature = crypto.createHmac("sha256", sharedSecret).update(query).digest("hex"); | |
| http.get({ | |
| port: 1337, | |
| path: "/?" + query, | |
| headers: { | |
| "X-Signature": signature | |
| } | |
| }, function (res) { | |
| console.log(res.statusCode); | |
| }); |
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| var http, url, crypto, sharedSecret; | |
| http = require("http"); | |
| url = require("url"); | |
| crypto = require("crypto"); | |
| sharedSecret = "super-secret"; | |
| http.createServer(function (req, res) { | |
| var retrievedSignature, parsedUrl, computedSignature; | |
| // Deal with CORS. | |
| res.setHeader("Access-Control-Allow-Origin", "*"); | |
| if (req.method === "OPTIONS") { | |
| res.setHeader("Access-Control-Allow-Headers", "X-Signature"); | |
| res.writeHead(204); | |
| res.end(); | |
| } else { | |
| // Get signature. | |
| retrievedSignature = req.headers["x-signature"]; | |
| // Recalculate signature. | |
| parsedUrl = url.parse(req.url); | |
| computedSignature = crypto.createHmac("sha256", sharedSecret).update(parsedUrl.query).digest("hex"); | |
| // Compare signatures. | |
| if (computedSignature === retrievedSignature) { | |
| res.writeHead(200, { | |
| "Content-Type": "text/plain" | |
| }); | |
| res.end("Hello World\n"); | |
| } else { | |
| res.writeHead(403, { | |
| "Content-Type": "text/plain" | |
| }); | |
| res.end("Get Out\n"); | |
| } | |
| } | |
| }).listen(1337); | |
| console.log("Server running on port 1337"); |
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