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JavaScript generic ASN.1 parser (mirror)
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615// ASN.1 JavaScript decoder// Copyright (c) 2008-2023 Lapo Luchini <lapo@lapo.it>
// Permission to use, copy, modify, and/or distribute this software for any// purpose with or without fee is hereby granted, provided that the above// copyright notice and this permission notice appear in all copies.// // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
(typeof define != 'undefined' ? define : function (factory) { 'use strict'; if (typeof module == 'object') module.exports = factory(function (name) { return require(name); }); else window.asn1 = factory(function (name) { return window[name.substring(2)]; });})(function (require) {'use strict';
const Int10 = require('./int10'), oids = require('./oids'), ellipsis = '\u2026', reTimeS = /^(\d\d)(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])([01]\d|2[0-3])(?:([0-5]\d)(?:([0-5]\d)(?:[.,](\d{1,3}))?)?)?(Z|(-(?:0\d|1[0-2])|[+](?:0\d|1[0-4]))([0-5]\d)?)?$/, reTimeL = /^(\d\d\d\d)(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])([01]\d|2[0-3])(?:([0-5]\d)(?:([0-5]\d)(?:[.,](\d{1,3}))?)?)?(Z|(-(?:0\d|1[0-2])|[+](?:0\d|1[0-4]))([0-5]\d)?)?$/, hexDigits = '0123456789ABCDEF', b64Safe = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_', tableT61 = [ ['', ''], ['AEIOUaeiou', 'ÀÈÌÒÙàèìòù'], // Grave ['ACEILNORSUYZacegilnorsuyz', 'ÁĆÉÍĹŃÓŔŚÚÝŹáćéģíĺńóŕśúýź'], // Acute ['ACEGHIJOSUWYaceghijosuwy', 'ÂĈÊĜĤÎĴÔŜÛŴŶâĉêĝĥîĵôŝûŵŷ'], // Circumflex ['AINOUainou', 'ÃĨÑÕŨãĩñõũ'], // Tilde ['AEIOUaeiou', 'ĀĒĪŌŪāēīōū'], // Macron ['AGUagu', 'ĂĞŬăğŭ'], // Breve ['CEGIZcegz', 'ĊĖĠİŻċėġż'], // Dot ['AEIOUYaeiouy', 'ÄËÏÖÜŸäëïöüÿ'], // Umlaut or diæresis ['', ''], ['AUau', 'ÅŮåů'], // Ring ['CGKLNRSTcklnrst', 'ÇĢĶĻŅŖŞŢçķļņŗşţ'], // Cedilla ['', ''], ['OUou', 'ŐŰőű'], // Double Acute ['AEIUaeiu', 'ĄĘĮŲąęįų'], // Ogonek ['CDELNRSTZcdelnrstz', 'ČĎĚĽŇŘŠŤŽčďěľňřšťž'] // Caron ];
function stringCut(str, len) { if (str.length > len) str = str.substring(0, len) + ellipsis; return str;}
function checkPrintable(s) { let i, v; for (i = 0; i < s.length; ++i) { v = s.charCodeAt(i); if (v < 32 && v != 9 && v != 10 && v != 13) // [\t\r\n] are (kinda) printable throw new Error('Unprintable character at index ' + i + ' (code ' + s.str.charCodeAt(i) + ')'); }}
class Stream {
constructor(enc, pos) { if (enc instanceof Stream) { this.enc = enc.enc; this.pos = enc.pos; } else { // enc should be an array or a binary string this.enc = enc; this.pos = pos; } } get(pos) { if (pos === undefined) pos = this.pos++; if (pos >= this.enc.length) throw 'Requesting byte offset ' + pos + ' on a stream of length ' + this.enc.length; return (typeof this.enc == 'string') ? this.enc.charCodeAt(pos) : this.enc[pos]; } hexByte(b) { return hexDigits.charAt((b >> 4) & 0xF) + hexDigits.charAt(b & 0xF); } hexDump(start, end, raw) { let s = ''; for (let i = start; i < end; ++i) { s += this.hexByte(this.get(i)); if (raw !== true) switch (i & 0xF) { case 0x7: s += ' '; break; case 0xF: s += '\n'; break; default: s += ' '; } } return s; } b64Dump(start, end) { let extra = (end - start) % 3, s = '', i, c; for (i = start; i + 2 < end; i += 3) { c = this.get(i) << 16 | this.get(i + 1) << 8 | this.get(i + 2); s += b64Safe.charAt(c >> 18 & 0x3F); s += b64Safe.charAt(c >> 12 & 0x3F); s += b64Safe.charAt(c >> 6 & 0x3F); s += b64Safe.charAt(c & 0x3F); } if (extra > 0) { c = this.get(i) << 16; if (extra > 1) c |= this.get(i + 1) << 8; s += b64Safe.charAt(c >> 18 & 0x3F); s += b64Safe.charAt(c >> 12 & 0x3F); if (extra == 2) s += b64Safe.charAt(c >> 6 & 0x3F); } return s; } isASCII(start, end) { for (let i = start; i < end; ++i) { let c = this.get(i); if (c < 32 || c > 176) return false; } return true; } parseStringISO(start, end, maxLength) { let s = ''; for (let i = start; i < end; ++i) s += String.fromCharCode(this.get(i)); return { size: s.length, str: stringCut(s, maxLength) }; } parseStringT61(start, end, maxLength) { // warning: this code is not very well tested so far function merge(c, d) { let t = tableT61[c - 0xC0]; let i = t[0].indexOf(String.fromCharCode(d)); return (i < 0) ? '\0' : t[1].charAt(i); } let s = '', c; for (let i = start; i < end; ++i) { c = this.get(i); if (c >= 0xA4 && c <= 0xBF) s += '$¥#§¤\0\0«\0\0\0\0°±²³×µ¶·÷\0\0»¼½¾¿'.charAt(c - 0xA4); else if (c >= 0xE0 && c <= 0xFF) s += 'ΩÆЪĦ\0IJĿŁØŒºÞŦŊʼnĸæđðħıijŀłøœßþŧŋ\0'.charAt(c - 0xE0); else if (c >= 0xC0 && c <= 0xCF) s += merge(c, this.get(++i)); else // using ISO 8859-1 for characters undefined (or equal) in T.61 s += String.fromCharCode(c); } return { size: s.length, str: stringCut(s, maxLength) }; } parseStringUTF(start, end, maxLength) { function ex(c) { // must be 10xxxxxx if ((c < 0x80) || (c >= 0xC0)) throw new Error('Invalid UTF-8 continuation byte: ' + c); return (c & 0x3F); } function surrogate(cp) { if (cp < 0x10000) throw new Error('UTF-8 overlong encoding, codepoint encoded in 4 bytes: ' + cp); // we could use String.fromCodePoint(cp) but let's be nice to older browsers and use surrogate pairs cp -= 0x10000; return String.fromCharCode((cp >> 10) + 0xD800, (cp & 0x3FF) + 0xDC00); } let s = ''; for (let i = start; i < end; ) { let c = this.get(i++); if (c < 0x80) // 0xxxxxxx (7 bit) s += String.fromCharCode(c); else if (c < 0xC0) throw new Error('Invalid UTF-8 starting byte: ' + c); else if (c < 0xE0) // 110xxxxx 10xxxxxx (11 bit) s += String.fromCharCode(((c & 0x1F) << 6) | ex(this.get(i++))); else if (c < 0xF0) // 1110xxxx 10xxxxxx 10xxxxxx (16 bit) s += String.fromCharCode(((c & 0x0F) << 12) | (ex(this.get(i++)) << 6) | ex(this.get(i++))); else if (c < 0xF8) // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx (21 bit) s += surrogate(((c & 0x07) << 18) | (ex(this.get(i++)) << 12) | (ex(this.get(i++)) << 6) | ex(this.get(i++))); else throw new Error('Invalid UTF-8 starting byte (since 2003 it is restricted to 4 bytes): ' + c); } return { size: s.length, str: stringCut(s, maxLength) }; } parseStringBMP(start, end, maxLength) { let s = '', hi, lo; for (let i = start; i < end; ) { hi = this.get(i++); lo = this.get(i++); s += String.fromCharCode((hi << 8) | lo); } return { size: s.length, str: stringCut(s, maxLength) }; } parseTime(start, end, shortYear) { let s = this.parseStringISO(start, end).str, m = (shortYear ? reTimeS : reTimeL).exec(s); if (!m) return 'Unrecognized time: ' + s; if (shortYear) { // to avoid querying the timer, use the fixed range [1970, 2069] // it will conform with ITU X.400 [-10, +40] sliding window until 2030 m[1] = +m[1]; m[1] += (m[1] < 70) ? 2000 : 1900; } s = m[1] + '-' + m[2] + '-' + m[3] + ' ' + m[4]; if (m[5]) { s += ':' + m[5]; if (m[6]) { s += ':' + m[6]; if (m[7]) s += '.' + m[7]; } } if (m[8]) { s += ' UTC'; if (m[9]) s += m[9] + ':' + (m[10] || '00'); } return s; } parseInteger(start, end) { let v = this.get(start), neg = (v > 127), pad = neg ? 255 : 0, len, s = ''; // skip unuseful bits (not allowed in DER) while (v == pad && ++start < end) v = this.get(start); len = end - start; if (len === 0) return neg ? '-1' : '0'; // show bit length of huge integers if (len > 4) { s = v; len <<= 3; while (((s ^ pad) & 0x80) == 0) { s <<= 1; --len; } s = '(' + len + ' bit)\n'; } // decode the integer if (neg) v = v - 256; let n = new Int10(v); for (let i = start + 1; i < end; ++i) n.mulAdd(256, this.get(i)); return s + n.toString(); } parseBitString(start, end, maxLength) { let unusedBits = this.get(start); if (unusedBits > 7) throw 'Invalid BitString with unusedBits=' + unusedBits; let lenBit = ((end - start - 1) << 3) - unusedBits, s = ''; for (let i = start + 1; i < end; ++i) { let b = this.get(i), skip = (i == end - 1) ? unusedBits : 0; for (let j = 7; j >= skip; --j) s += (b >> j) & 1 ? '1' : '0'; if (s.length > maxLength) s = stringCut(s, maxLength); } return { size: lenBit, str: s }; } parseOctetString(start, end, maxLength) { let len = end - start, s; try { s = this.parseStringUTF(start, end, maxLength); checkPrintable(s.str); return { size: end - start, str: s.str }; } catch (e) { // ignore } maxLength /= 2; // we work in bytes if (len > maxLength) end = start + maxLength; s = ''; for (let i = start; i < end; ++i) s += this.hexByte(this.get(i)); if (len > maxLength) s += ellipsis; return { size: len, str: s }; } parseOID(start, end, maxLength, isRelative) { let s = '', n = new Int10(), bits = 0; for (let i = start; i < end; ++i) { let v = this.get(i); n.mulAdd(128, v & 0x7F); bits += 7; if (!(v & 0x80)) { // finished if (s === '') { n = n.simplify(); if (isRelative) { s = (n instanceof Int10) ? n.toString() : '' + n; } else if (n instanceof Int10) { n.sub(80); s = '2.' + n.toString(); } else { let m = n < 80 ? n < 40 ? 0 : 1 : 2; s = m + '.' + (n - m * 40); } } else s += '.' + n.toString(); if (s.length > maxLength) return stringCut(s, maxLength); n = new Int10(); bits = 0; } } if (bits > 0) s += '.incomplete'; if (typeof oids === 'object' && !isRelative) { let oid = oids[s]; if (oid) { if (oid.d) s += '\n' + oid.d; if (oid.c) s += '\n' + oid.c; if (oid.w) s += '\n(warning!)'; } } return s; } parseRelativeOID(start, end, maxLength) { return this.parseOID(start, end, maxLength, true); }}
function recurse(el, parser, maxLength) { let avoidRecurse = true; if (el.tag.tagConstructed && el.sub) { avoidRecurse = false; el.sub.forEach(function (e1) { if (e1.tag.tagClass != el.tag.tagClass || e1.tag.tagNumber != el.tag.tagNumber) avoidRecurse = true; }); } if (avoidRecurse) return el.stream[parser](el.posContent(), el.posContent() + Math.abs(el.length), maxLength); let d = { size: 0, str: '' }; el.sub.forEach(function (el) { let d1 = recurse(el, parser, maxLength - d.str.length); d.size += d1.size; d.str += d1.str; }); return d;}
class ASN1Tag { constructor(stream) { let buf = stream.get(); this.tagClass = buf >> 6; this.tagConstructed = ((buf & 0x20) !== 0); this.tagNumber = buf & 0x1F; if (this.tagNumber == 0x1F) { // long tag let n = new Int10(); do { buf = stream.get(); n.mulAdd(128, buf & 0x7F); } while (buf & 0x80); this.tagNumber = n.simplify(); } } isUniversal() { return this.tagClass === 0x00; } isEOC() { return this.tagClass === 0x00 && this.tagNumber === 0x00; }}
class ASN1 { constructor(stream, header, length, tag, tagLen, sub) { if (!(tag instanceof ASN1Tag)) throw 'Invalid tag value.'; this.stream = stream; this.header = header; this.length = length; this.tag = tag; this.tagLen = tagLen; this.sub = sub; } typeName() { switch (this.tag.tagClass) { case 0: // universal switch (this.tag.tagNumber) { case 0x00: return 'EOC'; case 0x01: return 'BOOLEAN'; case 0x02: return 'INTEGER'; case 0x03: return 'BIT_STRING'; case 0x04: return 'OCTET_STRING'; case 0x05: return 'NULL'; case 0x06: return 'OBJECT_IDENTIFIER'; case 0x07: return 'ObjectDescriptor'; case 0x08: return 'EXTERNAL'; case 0x09: return 'REAL'; case 0x0A: return 'ENUMERATED'; case 0x0B: return 'EMBEDDED_PDV'; case 0x0C: return 'UTF8String'; case 0x0D: return 'RELATIVE_OID'; case 0x10: return 'SEQUENCE'; case 0x11: return 'SET'; case 0x12: return 'NumericString'; case 0x13: return 'PrintableString'; // ASCII subset case 0x14: return 'TeletexString'; // aka T61String case 0x15: return 'VideotexString'; case 0x16: return 'IA5String'; // ASCII case 0x17: return 'UTCTime'; case 0x18: return 'GeneralizedTime'; case 0x19: return 'GraphicString'; case 0x1A: return 'VisibleString'; // ASCII subset case 0x1B: return 'GeneralString'; case 0x1C: return 'UniversalString'; case 0x1E: return 'BMPString'; } return 'Universal_' + this.tag.tagNumber.toString(); case 1: return 'Application_' + this.tag.tagNumber.toString(); case 2: return '[' + this.tag.tagNumber.toString() + ']'; // Context case 3: return 'Private_' + this.tag.tagNumber.toString(); } } /** A string preview of the content (intended for humans). */ content(maxLength) { if (this.tag === undefined) return null; if (maxLength === undefined) maxLength = Infinity; let content = this.posContent(), len = Math.abs(this.length); if (!this.tag.isUniversal()) { if (this.sub !== null) return '(' + this.sub.length + ' elem)'; let d1 = this.stream.parseOctetString(content, content + len, maxLength); return '(' + d1.size + ' byte)\n' + d1.str; } switch (this.tag.tagNumber) { case 0x01: // BOOLEAN return (this.stream.get(content) === 0) ? 'false' : 'true'; case 0x02: // INTEGER return this.stream.parseInteger(content, content + len); case 0x03: { // BIT_STRING let d = recurse(this, 'parseBitString', maxLength); return '(' + d.size + ' bit)\n' + d.str; } case 0x04: { // OCTET_STRING let d = recurse(this, 'parseOctetString', maxLength); return '(' + d.size + ' byte)\n' + d.str; } //case 0x05: // NULL case 0x06: // OBJECT_IDENTIFIER return this.stream.parseOID(content, content + len, maxLength); //case 0x07: // ObjectDescriptor //case 0x08: // EXTERNAL //case 0x09: // REAL case 0x0A: // ENUMERATED return this.stream.parseInteger(content, content + len); //case 0x0B: // EMBEDDED_PDV case 0x0D: // RELATIVE-OID return this.stream.parseRelativeOID(content, content + len, maxLength); case 0x10: // SEQUENCE case 0x11: // SET if (this.sub !== null) return '(' + this.sub.length + ' elem)'; else return '(no elem)'; case 0x0C: // UTF8String return recurse(this, 'parseStringUTF', maxLength).str; case 0x14: // TeletexString return recurse(this, 'parseStringT61', maxLength).str; case 0x12: // NumericString case 0x13: // PrintableString case 0x15: // VideotexString case 0x16: // IA5String case 0x1A: // VisibleString case 0x1B: // GeneralString //case 0x19: // GraphicString //case 0x1C: // UniversalString return recurse(this, 'parseStringISO', maxLength).str; case 0x1E: // BMPString return recurse(this, 'parseStringBMP', maxLength).str; case 0x17: // UTCTime case 0x18: // GeneralizedTime return this.stream.parseTime(content, content + len, (this.tag.tagNumber == 0x17)); } return null; } toString() { return this.typeName() + '@' + this.stream.pos + '[header:' + this.header + ',length:' + this.length + ',sub:' + ((this.sub === null) ? 'null' : this.sub.length) + ']'; } toPrettyString(indent) { if (indent === undefined) indent = ''; let s = indent + this.typeName() + ' @' + this.stream.pos; if (this.length >= 0) s += '+'; s += this.length; if (this.tag.tagConstructed) s += ' (constructed)'; else if ((this.tag.isUniversal() && ((this.tag.tagNumber == 0x03) || (this.tag.tagNumber == 0x04))) && (this.sub !== null)) s += ' (encapsulates)'; let content = this.content(); if (content) s += ': ' + content.replace(/\n/g, '|'); s += '\n'; if (this.sub !== null) { indent += ' '; for (let i = 0, max = this.sub.length; i < max; ++i) s += this.sub[i].toPrettyString(indent); } return s; } posStart() { return this.stream.pos; } posContent() { return this.stream.pos + this.header; } posEnd() { return this.stream.pos + this.header + Math.abs(this.length); } /** Position of the length. */ posLen() { return this.stream.pos + this.tagLen; } toHexString() { return this.stream.hexDump(this.posStart(), this.posEnd(), true); } toB64String() { return this.stream.b64Dump(this.posStart(), this.posEnd()); } static decodeLength(stream) { let buf = stream.get(), len = buf & 0x7F; if (len == buf) // first bit was 0, short form return len; if (len === 0) // long form with length 0 is a special case return null; // undefined length if (len > 6) // no reason to use Int10, as it would be a huge buffer anyways throw 'Length over 48 bits not supported at position ' + (stream.pos - 1); buf = 0; for (let i = 0; i < len; ++i) buf = (buf * 256) + stream.get(); return buf; } static decode(stream, offset, type = ASN1) { if (!(type == ASN1 || type.prototype instanceof ASN1)) throw 'Must pass a class that extends ASN1'; if (!(stream instanceof Stream)) stream = new Stream(stream, offset || 0); let streamStart = new Stream(stream), tag = new ASN1Tag(stream), tagLen = stream.pos - streamStart.pos, len = ASN1.decodeLength(stream), start = stream.pos, header = start - streamStart.pos, sub = null, getSub = function () { sub = []; if (len !== null) { // definite length let end = start + len; if (end > stream.enc.length) throw 'Container at offset ' + start + ' has a length of ' + len + ', which is past the end of the stream'; while (stream.pos < end) sub[sub.length] = type.decode(stream); if (stream.pos != end) throw 'Content size is not correct for container at offset ' + start; } else { // undefined length try { for (;;) { let s = type.decode(stream); if (s.tag.isEOC()) break; sub[sub.length] = s; } len = start - stream.pos; // undefined lengths are represented as negative values } catch (e) { throw 'Exception while decoding undefined length content at offset ' + start + ': ' + e; } } }; if (tag.tagConstructed) { // must have valid content getSub(); } else if (tag.isUniversal() && ((tag.tagNumber == 0x03) || (tag.tagNumber == 0x04))) { // sometimes BitString and OctetString are used to encapsulate ASN.1 try { if (tag.tagNumber == 0x03) if (stream.get() != 0) throw 'BIT STRINGs with unused bits cannot encapsulate.'; getSub(); for (let i = 0; i < sub.length; ++i) if (sub[i].tag.isEOC()) throw 'EOC is not supposed to be actual content.'; } catch (e) { // but silently ignore when they don't sub = null; //DEBUG console.log('Could not decode structure at ' + start + ':', e); } } if (sub === null) { if (len === null) throw "We can't skip over an invalid tag with undefined length at offset " + start; stream.pos = start + Math.abs(len); } return new type(streamStart, header, len, tag, tagLen, sub); }
}
return ASN1;
});