77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
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// Copyright 2014 ISRG. All rights reserved
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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'use strict';
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var utils = {
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fromStandardB64: function(x) {
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return x.replace(/[+]/g, "-").replace(/\//g, "_").replace(/=/g,"");
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},
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toStandardB64: function(x) {
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var b64 = x.replace(/-/g, "+").replace(/_/g, "/").replace(/=/g, "");
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switch (b64.length % 4) {
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case 2: b64 += "=="; break;
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case 3: b64 += "="; break;
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}
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return b64;
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},
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b64enc: function(buffer) {
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return utils.fromStandardB64(buffer.toString("base64"));
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},
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b64dec: function(str) {
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return new Buffer(utils.toStandardB64(str), "base64");
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},
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isB64String: function(x) {
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return ("string" === typeof x) && !x.match(/[^a-zA-Z0-9_-]/);
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},
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fieldsPresent: function(fields, object) {
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for (var i in fields) {
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if (!(fields[i] in object)) {
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return false;
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}
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}
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return true;
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},
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validSignature: function(sig) {
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return (("object" === typeof sig) &&
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("alg" in sig) && ("string" === typeof sig.alg) &&
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("nonce" in sig) && utils.isB64String(sig.nonce) &&
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("sig" in sig) && utils.isB64String(sig.sig) &&
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("jwk" in sig) && utils.validJWK(sig.jwk));
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},
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validJWK: function(jwk) {
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return (("object" === typeof jwk) && ("kty" in jwk) && (
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((jwk.kty === "RSA")
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&& ("n" in jwk) && utils.isB64String(jwk.n)
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&& ("e" in jwk) && utils.isB64String(jwk.e)) ||
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((jwk.kty === "EC")
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&& ("crv" in jwk)
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&& ("x" in jwk) && utils.isB64String(jwk.x)
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&& ("y" in jwk) && utils.isB64String(jwk.y))
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) && !("d" in jwk));
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},
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// A simple, non-standard fingerprint for a JWK,
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// just so that we don't have to store objects
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keyFingerprint: function(jwk) {
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switch (jwk.kty) {
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case "RSA": return jwk.n;
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case "EC": return jwk.crv + jwk.x + jwk.y;
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}
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throw "Unrecognized key type";
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}
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};
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module.exports = utils;
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