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@ -1,6 +1,6 @@
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# Bluecrypt ASN.1 Parser
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An ASN.1 parser in less than 100 lines of Vanilla JavaScript,
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An ASN.1 decoder in less than 100 lines of Vanilla JavaScript,
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part of the Bluecrypt suite.
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<br>
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<small>(< 150 with newlines and comments)</small>
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@ -17,6 +17,10 @@ part of the Bluecrypt suite.
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* [x] Online [Demo](https://coolaj86.com/demos/asn1-parser/)
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* [ ] Node.js (built, publishing soon)
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### Need an ASN.1 Builder too?
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Check out https://git.coolaj86.com/coolaj86/asn1-packer.js/
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# Demo
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<https://coolaj86.com/demos/asn1-parser/>
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@ -1,3 +1,7 @@
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// Copyright 2018 AJ ONeal. 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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;(function (exports) {
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'use strict';
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@ -13,8 +17,13 @@ var PEM = exports.PEM;
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// Parser
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//
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ASN1.ELOOP = "uASN1.js Error: iterated over 15+ elements (probably a malformed file)";
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ASN1.EDEEP = "uASN1.js Error: element nested 20+ layers deep (probably a malformed file)";
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// Although I've only seen 9 max in https certificates themselves,
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// but each domain list could have up to 100
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ASN1.ELOOPN = 102;
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ASN1.ELOOP = "uASN1.js Error: iterated over " + ASN1.ELOOPN + "+ elements (probably a malformed file)";
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// I've seen https certificates go 29 deep
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ASN1.EDEEPN = 60;
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ASN1.EDEEP = "uASN1.js Error: element nested " + ASN1.EDEEPN + "+ layers deep (probably a malformed file)";
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// Container Types are Sequence 0x30, Container Array? (0xA0, 0xA1)
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// Value Types are Boolean 0x01, Integer 0x02, Null 0x05, Object ID 0x06, String 0x0C, 0x16, 0x13, 0x1e Value Array? (0x82)
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// Bit String (0x03) and Octet String (0x04) may be values or containers
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@ -23,8 +32,8 @@ ASN1.CTYPES = [ 0x30, 0x31, 0xa0, 0xa1 ];
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ASN1.VTYPES = [ 0x01, 0x02, 0x05, 0x06, 0x0c, 0x82 ];
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ASN1.parse = function parseAsn1Helper(buf) {
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//var ws = ' ';
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function parseAsn1(buf, depth) {
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if (depth.length >= 20) { throw new Error(ASN1.EDEEP); }
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function parseAsn1(buf, depth, eager) {
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if (depth.length >= ASN1.EDEEPN) { throw new Error(ASN1.EDEEP); }
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var index = 2; // we know, at minimum, data starts after type (0) and lengthSize (1)
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var asn1 = { type: buf[0], lengthSize: 0, length: buf[1] };
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@ -57,10 +66,11 @@ ASN1.parse = function parseAsn1Helper(buf) {
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function parseChildren(eager) {
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asn1.children = [];
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//console.warn('1 len:', (2 + asn1.lengthSize + asn1.length), 'idx:', index, 'clen:', 0);
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while (iters < 15 && index < (2 + asn1.length + asn1.lengthSize)) {
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while (iters < ASN1.ELOOPN && index < (2 + asn1.length + asn1.lengthSize)) {
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iters += 1;
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depth.length += 1;
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child = parseAsn1(buf.slice(index, index + adjustedLen), depth);
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child = parseAsn1(buf.slice(index, index + adjustedLen), depth, eager);
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depth.length -= 1;
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// The numbers don't match up exactly and I don't remember why...
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// probably something with adjustedLen or some such, but the tests pass
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index += (2 + child.lengthSize + child.length);
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@ -78,14 +88,14 @@ ASN1.parse = function parseAsn1Helper(buf) {
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//console.warn('index:', index, 'length:', (2 + asn1.lengthSize + asn1.length));
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throw new Error("premature end-of-file");
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}
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if (iters >= 15) { throw new Error(ASN1.ELOOP); }
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if (iters >= ASN1.ELOOPN) { throw new Error(ASN1.ELOOP); }
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delete asn1.value;
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return asn1;
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}
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// Recurse into types that are _always_ containers
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if (-1 !== ASN1.CTYPES.indexOf(asn1.type)) { return parseChildren(); }
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if (-1 !== ASN1.CTYPES.indexOf(asn1.type)) { return parseChildren(eager); }
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// Return types that are _always_ values
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asn1.value = buf.slice(index, index + adjustedLen);
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20
index.html
20
index.html
@ -12,22 +12,38 @@
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<body>
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<h1>Bluecrypt ASN.1 Parser</h1>
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<h2>PEM (base64-encoded DER)</h2>
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<textarea class="js-input" placeholder="Paste a PEM here">-----BEGIN PUBLIC KEY-----
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MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEIT1SWLxsacPiE5Z16jkopAn8/+85
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rMjgyCokrnjDft6Y/YnA4A50yZe7CnFsqeDcpnPbubP6cpYiVcnevNIYyg==
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-----END PUBLIC KEY-----</textarea>
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<h2>Hex</h2>
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<pre><code class="js-hex"> </code></pre>
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<h2>ASN.1 Array</h2>
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<pre><code class="js-array"> </code></pre>
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<h2>ASN.1 Object</h2>
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<pre><code class="js-json"> </code></pre>
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<br>
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<p>Made with <a href="https://git.coolaj86.com/coolaj86/asn1-parser/">asn1-parser.js</a></p>
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<p>Made with <a href="https://git.coolaj86.com/coolaj86/asn1-parser.js/">asn1-parser.js</a></p>
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<script src="./asn1-parser.js"></script>
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<script>
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var $input = document.querySelector('.js-input');
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function toArray(next) {
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console.log(next);
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if (next.value) {
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return [next.type, Enc.bufToHex(next.value)];
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}
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return [next.type, next.children.map(function (child) {
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return toArray(child);
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})];
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}
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function convert() {
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console.log('keyup');
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var json;
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@ -35,6 +51,7 @@ rMjgyCokrnjDft6Y/YnA4A50yZe7CnFsqeDcpnPbubP6cpYiVcnevNIYyg==
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try {
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var pem = PEM.parseBlock(document.querySelector('.js-input').value);
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var hex = Enc.bufToHex(pem.der);
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var arr = [];
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document.querySelector('.js-hex').innerText = hex
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.match(/.{2}/g).join(' ').match(/.{1,24}/g).join(' ').match(/.{1,50}/g).join('\n');
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json = ASN1.parse(pem.der);
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@ -43,6 +60,7 @@ rMjgyCokrnjDft6Y/YnA4A50yZe7CnFsqeDcpnPbubP6cpYiVcnevNIYyg==
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}
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document.querySelector('.js-json').innerText = JSON.stringify(json, ASN1._replacer, 2);
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document.querySelector('.js-array').innerText = JSON.stringify(toArray(json), null, 2);
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}
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$input.addEventListener('keyup', convert);
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@ -1,6 +1,6 @@
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{
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"name": "asn1-parser",
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"version": "1.1.3",
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"version": "1.1.8",
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"description": "An ASN.1 parser in less than 100 lines of Vanilla JavaScript, part of the Bluecrypt suite.",
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"homepage": "https://git.coolaj86.com/coolaj86/asn1-parser.js",
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"main": "asn1-parser.js",
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