296 lines
11 KiB
JavaScript
296 lines
11 KiB
JavaScript
;(function (exports) {
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'use strict';
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var OAUTH3 = exports.OAUTH3 = exports.OAUTH3 || require('./oauth3.core.js').OAUTH3;
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OAUTH3.crypto = {};
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try {
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OAUTH3.crypto.core = require('./oauth3.node.crypto');
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} catch (error) {
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OAUTH3.crypto.core = {};
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// We don't currently have a fallback method for this function, so we assign
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// it directly to the core object instead of the webCrypto object.
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OAUTH3.crypto.core.randomBytes = function (size) {
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var buf = OAUTH3._browser.window.crypto.getRandomValues(new Uint8Array(size));
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return OAUTH3.PromiseA.resolve(buf);
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};
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var webCrypto = {};
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webCrypto.sha256 = function (buf) {
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return OAUTH3._browser.window.crypto.subtle.digest({name: 'SHA-256'}, buf);
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};
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webCrypto.pbkdf2 = function (password, salt) {
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return OAUTH3._browser.window.crypto.subtle.importKey('raw', OAUTH3._binStr.binStrToBuffer(password), {name: 'PBKDF2'}, false, ['deriveKey'])
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.then(function (key) {
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var opts = {name: 'PBKDF2', salt: salt, iterations: 8192, hash: {name: 'SHA-256'}};
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return OAUTH3._browser.window.crypto.subtle.deriveKey(opts, key, {name: 'AES-GCM', length: 128}, true, ['encrypt', 'decrypt']);
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})
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.then(function (key) {
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return OAUTH3._browser.window.crypto.subtle.exportKey('raw', key);
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});
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};
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webCrypto.encrypt = function (rawKey, iv, data) {
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return OAUTH3._browser.window.crypto.subtle.importKey('raw', rawKey, {name: 'AES-GCM'}, false, ['encrypt'])
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.then(function (key) {
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return OAUTH3._browser.window.crypto.subtle.encrypt({name: 'AES-GCM', iv: iv}, key, data);
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});
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};
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webCrypto.decrypt = function (rawKey, iv, data) {
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return OAUTH3._browser.window.crypto.subtle.importKey('raw', rawKey, {name: 'AES-GCM'}, false, ['decrypt'])
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.then(function (key) {
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return OAUTH3._browser.window.crypto.subtle.decrypt({name: 'AES-GCM', iv: iv}, key, data);
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});
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};
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webCrypto.genEcdsaKeyPair = function () {
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return OAUTH3._browser.window.crypto.subtle.generateKey({name: 'ECDSA', namedCurve: 'P-256'}, true, ['sign', 'verify'])
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.then(function (keyPair) {
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return OAUTH3.PromiseA.all([
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OAUTH3._browser.window.crypto.subtle.exportKey('jwk', keyPair.privateKey)
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, OAUTH3._browser.window.crypto.subtle.exportKey('jwk', keyPair.publicKey)
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]);
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}).then(function (jwkPair) {
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return { privateKey: jwkPair[0], publicKey: jwkPair[1] };
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});
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};
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webCrypto.sign = function (jwk, msg) {
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return OAUTH3._browser.window.crypto.subtle.importKey('jwk', jwk, {name: 'ECDSA', namedCurve: jwk.crv}, false, ['sign'])
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.then(function (key) {
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return OAUTH3._browser.window.crypto.subtle.sign({name: 'ECDSA', hash: {name: 'SHA-256'}}, key, msg);
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})
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.then(function (sig) {
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return new Uint8Array(sig);
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});
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};
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webCrypto.verify = function (jwk, msg, signature) {
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// If the JWK has properties that should only exist on the private key or is missing
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// "verify" in the key_ops, importing in as a public key won't work.
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if (jwk.hasOwnProperty('d') || jwk.hasOwnProperty('key_ops')) {
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jwk = JSON.parse(JSON.stringify(jwk));
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delete jwk.d;
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delete jwk.key_ops;
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}
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return OAUTH3._browser.window.crypto.subtle.importKey('jwk', jwk, {name: 'ECDSA', namedCurve: jwk.crv}, false, ['verify'])
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.then(function (key) {
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return OAUTH3._browser.window.crypto.subtle.verify({name: 'ECDSA', hash: {name: 'SHA-256'}}, key, signature, msg);
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});
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};
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function checkWebCrypto() {
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var loadFallback = function() {
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var prom;
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loadFallback = function () { return prom; };
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prom = new OAUTH3.PromiseA(function (resolve) {
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var body = document.getElementsByTagName('body')[0];
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var script = document.createElement('script');
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script.type = 'text/javascript';
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script.onload = resolve;
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script.onreadystatechange = function () {
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if (this.readyState === 'complete' || this.readyState === 'loaded') {
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resolve();
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}
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};
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script.src = '/assets/org.oauth3/oauth3.crypto.fallback.js';
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body.appendChild(script);
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});
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return prom;
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};
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function checkException(name, func) {
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new OAUTH3.PromiseA(function (resolve) { resolve(func()); })
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.then(function () {
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OAUTH3.crypto.core[name] = webCrypto[name];
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})
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.catch(function (err) {
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console.warn('error with WebCrypto', name, '- using fallback', err);
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loadFallback().then(function () {
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OAUTH3.crypto.core[name] = OAUTH3_crypto_fallback[name];
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});
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});
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}
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function checkResult(name, expected, func) {
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checkException(name, function () {
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return func()
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.then(function (result) {
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if (typeof expected === typeof result) {
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return result;
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}
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return OAUTH3._base64.bufferToUrlSafe(result);
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})
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.then(function (result) {
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if (result !== expected) {
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throw new Error("result ("+result+") doesn't match expectation ("+expected+")");
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}
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});
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});
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}
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var zeroBuf = new Uint8Array([0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]);
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var dataBuf = OAUTH3._base64.urlSafeToBuffer('1234567890abcdefghijklmn');
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var keyBuf = OAUTH3._base64.urlSafeToBuffer('l_Aeoqk6ePjwjCYrlHrgrg');
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var encBuf = OAUTH3._base64.urlSafeToBuffer('Ji_gEtcNElUONSR4Mf9S75davXjh_6-oQN9AgO5UF8rERw');
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checkResult('sha256', 'BwMveUm2V1axuERvUoxM4dScgNl9yKhER9a6p80GXj4', function () {
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return webCrypto.sha256(dataBuf);
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});
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checkResult('pbkdf2', OAUTH3._base64.bufferToUrlSafe(keyBuf), function () {
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return webCrypto.pbkdf2('password', zeroBuf);
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});
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checkResult('encrypt', OAUTH3._base64.bufferToUrlSafe(encBuf), function () {
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return webCrypto.encrypt(keyBuf, zeroBuf.slice(0, 12), dataBuf);
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});
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checkResult('decrypt', OAUTH3._base64.bufferToUrlSafe(dataBuf), function () {
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return webCrypto.decrypt(keyBuf, zeroBuf.slice(0, 12), encBuf);
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});
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var jwk = {
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kty: "EC"
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, crv: "P-256"
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, d: "ChXx7ea5YtEltCufA8CVb0lQv3glcCfcSpEgdedgIP0"
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, x: "Akt5ZDbytcKS5UQMURvGb_UIMS4qFctDwrX8bX22ato"
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, y: "cV7nhpWNT1FeRIbdold4jLtgsEpZBFcNy3p2E5mqvto"
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};
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var sig = OAUTH3._base64.urlSafeToBuffer('nc3F8qeP8OXpfqPD9tTcFQg0Wfp37RTAppLPIKE1ZupR_8Aba64hNExwd1dOk802OFQxaECPDZCkKe7WA9RXAg');
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checkResult('verify', true, function() {
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return webCrypto.verify(jwk, dataBuf, sig);
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});
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// The results of these functions are less predictable, so we can't check their return value.
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checkException('genEcdsaKeyPair', function () {
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return webCrypto.genEcdsaKeyPair();
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});
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checkException('sign', function () {
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return webCrypto.sign(jwk, dataBuf);
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});
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}
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checkWebCrypto();
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}
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OAUTH3.crypto.thumbprintJwk = function (jwk) {
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var keys;
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if (jwk.kty === 'EC') {
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keys = ['crv', 'x', 'y'];
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} else if (jwk.kty === 'RSA') {
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keys = ['e', 'n'];
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} else if (jwk.kty === 'oct') {
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keys = ['k'];
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} else {
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return OAUTH3.PromiseA.reject(new Error('invalid JWK key type ' + jwk.kty));
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}
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keys.push('kty');
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keys.sort();
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var missing = keys.filter(function (name) { return !jwk.hasOwnProperty(name); });
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if (missing.length > 0) {
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return OAUTH3.PromiseA.reject(new Error('JWK of type '+jwk.kty+' missing fields ' + missing));
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}
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// I'm not actually 100% sure this behavior is guaranteed, but when we use an array as the
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// replacer argument the keys are always in the order they appeared in the array.
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var jwkStr = JSON.stringify(jwk, keys);
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return OAUTH3.crypto.core.sha256(OAUTH3._binStr.binStrToBuffer(jwkStr))
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.then(OAUTH3._base64.bufferToUrlSafe);
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};
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OAUTH3.crypto._createKey = function (ppid) {
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var saltProm = OAUTH3.crypto.core.randomBytes(16);
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var kekProm = saltProm.then(function (salt) {
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return OAUTH3.crypto.core.pbkdf2(ppid, salt);
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});
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var ecdsaProm = OAUTH3.crypto.core.genEcdsaKeyPair()
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.then(function (keyPair) {
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return OAUTH3.crypto.thumbprintJwk(keyPair.publicKey).then(function (kid) {
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keyPair.privateKey.alg = keyPair.publicKey.alg = 'ES256';
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keyPair.privateKey.kid = keyPair.publicKey.kid = kid;
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return keyPair;
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});
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});
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return OAUTH3.PromiseA.all([
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kekProm
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, ecdsaProm
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, saltProm
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, OAUTH3.crypto.core.randomBytes(16)
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, OAUTH3.crypto.core.randomBytes(12)
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, OAUTH3.crypto.core.randomBytes(12)
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]).then(function (results) {
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var kek = results[0];
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var keyPair = results[1];
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var salt = results[2];
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var userSecret = results[3];
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var ecdsaIv = results[4];
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var secretIv = results[5];
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return OAUTH3.PromiseA.all([
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OAUTH3.crypto.core.encrypt(kek, ecdsaIv, OAUTH3._binStr.binStrToBuffer(JSON.stringify(keyPair.privateKey)))
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, OAUTH3.crypto.core.encrypt(kek, secretIv, userSecret)
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])
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.then(function (encrypted) {
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return {
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publicKey: keyPair.publicKey
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, privateKey: OAUTH3._base64.bufferToUrlSafe(encrypted[0])
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, userSecret: OAUTH3._base64.bufferToUrlSafe(encrypted[1])
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, salt: OAUTH3._base64.bufferToUrlSafe(salt)
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, ecdsaIv: OAUTH3._base64.bufferToUrlSafe(ecdsaIv)
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, secretIv: OAUTH3._base64.bufferToUrlSafe(secretIv)
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};
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});
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});
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};
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OAUTH3.crypto._decryptKey = function (ppid, storedObj) {
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var salt = OAUTH3._base64.urlSafeToBuffer(storedObj.salt);
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var encJwk = OAUTH3._base64.urlSafeToBuffer(storedObj.privateKey);
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var iv = OAUTH3._base64.urlSafeToBuffer(storedObj.ecdsaIv);
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return OAUTH3.crypto.core.pbkdf2(ppid, salt)
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.then(function (key) {
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return OAUTH3.crypto.core.decrypt(key, iv, encJwk);
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})
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.then(OAUTH3._binStr.bufferToBinStr)
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.then(JSON.parse);
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};
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OAUTH3.crypto._getKey = function (ppid) {
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return OAUTH3.crypto.core.sha256(OAUTH3._binStr.binStrToBuffer(ppid))
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.then(function (hash) {
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var name = 'kek-' + OAUTH3._base64.bufferToUrlSafe(hash);
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var promise;
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if (window.localStorage.getItem(name) === null) {
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promise = OAUTH3.crypto._createKey(ppid).then(function (key) {
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window.localStorage.setItem(name, JSON.stringify(key));
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return key;
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});
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} else {
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promise = OAUTH3.PromiseA.resolve(JSON.parse(window.localStorage.getItem(name)));
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}
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return promise.then(function (storedObj) {
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return OAUTH3.crypto._decryptKey(ppid, storedObj);
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});
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});
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};
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OAUTH3.crypto._signPayload = function (payload) {
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return OAUTH3.crypto._getKey('some PPID').then(function (key) {
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var header = {type: 'JWT', alg: key.alg, kid: key.kid};
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var input = [
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OAUTH3._base64.encodeUrlSafe(JSON.stringify(header, null))
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, OAUTH3._base64.encodeUrlSafe(JSON.stringify(payload, null))
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].join('.');
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return OAUTH3.crypto.core.sign(key, OAUTH3._binStr.binStrToBuffer(input))
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.then(OAUTH3._base64.bufferToUrlSafe)
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.then(function (signature) {
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return input + '.' + signature;
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});
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});
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};
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}('undefined' !== typeof exports ? exports : window));
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