// ASN.1 JavaScript decoder
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// Copyright (c) 2008-2014 Lapo Luchini <lapo@lapo.it>
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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/*jshint browser: true, strict: true, immed: true, latedef: true, undef: true, regexdash: false */
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/*global oids */
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import { Int10 } from "./int10";
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var ellipsis = "\u2026";
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var 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])([0-5]\d)?)?$/;
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var reTimeL = /^(\d\d\d\d)(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])([01]\d|2[0-3])(?:([0-5]\d)(?:([0-5]\d)(?:[.,](\d{1,3}))?)?)?(Z|[-+](?:[0]\d|1[0-2])([0-5]\d)?)?$/;
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function stringCut(str, len) {
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if (str.length > len) {
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str = str.substring(0, len) + ellipsis;
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}
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return str;
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}
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var Stream = /** @class */ (function () {
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function Stream(enc, pos) {
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this.hexDigits = "0123456789ABCDEF";
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if (enc instanceof Stream) {
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this.enc = enc.enc;
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this.pos = enc.pos;
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}
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else {
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// enc should be an array or a binary string
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this.enc = enc;
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this.pos = pos;
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}
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}
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Stream.prototype.get = function (pos) {
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if (pos === undefined) {
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pos = this.pos++;
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}
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if (pos >= this.enc.length) {
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throw new Error("Requesting byte offset ".concat(pos, " on a stream of length ").concat(this.enc.length));
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}
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return ("string" === typeof this.enc) ? this.enc.charCodeAt(pos) : this.enc[pos];
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};
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Stream.prototype.hexByte = function (b) {
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return this.hexDigits.charAt((b >> 4) & 0xF) + this.hexDigits.charAt(b & 0xF);
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};
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Stream.prototype.hexDump = function (start, end, raw) {
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var s = "";
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for (var i = start; i < end; ++i) {
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s += this.hexByte(this.get(i));
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if (raw !== true) {
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switch (i & 0xF) {
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case 0x7:
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s += " ";
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break;
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case 0xF:
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s += "\n";
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break;
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default:
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s += " ";
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}
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}
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}
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return s;
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};
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Stream.prototype.isASCII = function (start, end) {
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for (var i = start; i < end; ++i) {
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var c = this.get(i);
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if (c < 32 || c > 176) {
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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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Stream.prototype.parseStringISO = function (start, end) {
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var s = "";
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for (var i = start; i < end; ++i) {
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s += String.fromCharCode(this.get(i));
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}
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return s;
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};
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Stream.prototype.parseStringUTF = function (start, end) {
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var s = "";
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for (var i = start; i < end;) {
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var c = this.get(i++);
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if (c < 128) {
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s += String.fromCharCode(c);
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}
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else if ((c > 191) && (c < 224)) {
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s += String.fromCharCode(((c & 0x1F) << 6) | (this.get(i++) & 0x3F));
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}
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else {
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s += String.fromCharCode(((c & 0x0F) << 12) | ((this.get(i++) & 0x3F) << 6) | (this.get(i++) & 0x3F));
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}
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}
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return s;
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};
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Stream.prototype.parseStringBMP = function (start, end) {
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var str = "";
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var hi;
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var lo;
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for (var i = start; i < end;) {
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hi = this.get(i++);
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lo = this.get(i++);
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str += String.fromCharCode((hi << 8) | lo);
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}
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return str;
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};
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Stream.prototype.parseTime = function (start, end, shortYear) {
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var s = this.parseStringISO(start, end);
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var m = (shortYear ? reTimeS : reTimeL).exec(s);
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if (!m) {
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return "Unrecognized time: " + s;
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}
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if (shortYear) {
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// to avoid querying the timer, use the fixed range [1970, 2069]
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// it will conform with ITU X.400 [-10, +40] sliding window until 2030
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m[1] = +m[1];
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m[1] += (+m[1] < 70) ? 2000 : 1900;
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}
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s = m[1] + "-" + m[2] + "-" + m[3] + " " + m[4];
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if (m[5]) {
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s += ":" + m[5];
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if (m[6]) {
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s += ":" + m[6];
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if (m[7]) {
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s += "." + m[7];
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}
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}
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}
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if (m[8]) {
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s += " UTC";
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if (m[8] != "Z") {
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s += m[8];
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if (m[9]) {
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s += ":" + m[9];
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}
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}
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}
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return s;
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};
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Stream.prototype.parseInteger = function (start, end) {
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var v = this.get(start);
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var neg = (v > 127);
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var pad = neg ? 255 : 0;
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var len;
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var s = "";
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// skip unuseful bits (not allowed in DER)
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while (v == pad && ++start < end) {
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v = this.get(start);
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}
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len = end - start;
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if (len === 0) {
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return neg ? -1 : 0;
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}
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// show bit length of huge integers
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if (len > 4) {
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s = v;
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len <<= 3;
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while (((+s ^ pad) & 0x80) == 0) {
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s = +s << 1;
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--len;
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}
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s = "(" + len + " bit)\n";
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}
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// decode the integer
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if (neg) {
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v = v - 256;
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}
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var n = new Int10(v);
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for (var i = start + 1; i < end; ++i) {
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n.mulAdd(256, this.get(i));
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}
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return s + n.toString();
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};
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Stream.prototype.parseBitString = function (start, end, maxLength) {
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var unusedBit = this.get(start);
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var lenBit = ((end - start - 1) << 3) - unusedBit;
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var intro = "(" + lenBit + " bit)\n";
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var s = "";
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for (var i = start + 1; i < end; ++i) {
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var b = this.get(i);
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var skip = (i == end - 1) ? unusedBit : 0;
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for (var j = 7; j >= skip; --j) {
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s += (b >> j) & 1 ? "1" : "0";
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}
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if (s.length > maxLength) {
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return intro + stringCut(s, maxLength);
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}
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}
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return intro + s;
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};
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Stream.prototype.parseOctetString = function (start, end, maxLength) {
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if (this.isASCII(start, end)) {
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return stringCut(this.parseStringISO(start, end), maxLength);
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}
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var len = end - start;
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var s = "(" + len + " byte)\n";
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maxLength /= 2; // we work in bytes
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if (len > maxLength) {
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end = start + maxLength;
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}
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for (var i = start; i < end; ++i) {
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s += this.hexByte(this.get(i));
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}
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if (len > maxLength) {
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s += ellipsis;
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}
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return s;
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};
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Stream.prototype.parseOID = function (start, end, maxLength) {
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var s = "";
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var n = new Int10();
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var bits = 0;
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for (var i = start; i < end; ++i) {
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var v = this.get(i);
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n.mulAdd(128, v & 0x7F);
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bits += 7;
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if (!(v & 0x80)) { // finished
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if (s === "") {
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n = n.simplify();
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if (n instanceof Int10) {
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n.sub(80);
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s = "2." + n.toString();
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}
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else {
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var m = n < 80 ? n < 40 ? 0 : 1 : 2;
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s = m + "." + (n - m * 40);
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}
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}
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else {
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s += "." + n.toString();
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}
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if (s.length > maxLength) {
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return stringCut(s, maxLength);
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}
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n = new Int10();
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bits = 0;
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}
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}
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if (bits > 0) {
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s += ".incomplete";
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}
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return s;
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};
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return Stream;
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}());
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export { Stream };
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var ASN1 = /** @class */ (function () {
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function ASN1(stream, header, length, tag, sub) {
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if (!(tag instanceof ASN1Tag)) {
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throw new Error("Invalid tag value.");
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}
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this.stream = stream;
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this.header = header;
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this.length = length;
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this.tag = tag;
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this.sub = sub;
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}
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ASN1.prototype.typeName = function () {
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switch (this.tag.tagClass) {
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case 0: // universal
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switch (this.tag.tagNumber) {
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case 0x00:
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return "EOC";
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case 0x01:
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return "BOOLEAN";
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case 0x02:
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return "INTEGER";
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case 0x03:
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return "BIT_STRING";
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case 0x04:
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return "OCTET_STRING";
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case 0x05:
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return "NULL";
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case 0x06:
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return "OBJECT_IDENTIFIER";
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case 0x07:
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return "ObjectDescriptor";
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case 0x08:
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return "EXTERNAL";
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case 0x09:
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return "REAL";
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case 0x0A:
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return "ENUMERATED";
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case 0x0B:
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return "EMBEDDED_PDV";
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case 0x0C:
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return "UTF8String";
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case 0x10:
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return "SEQUENCE";
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case 0x11:
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return "SET";
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case 0x12:
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return "NumericString";
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case 0x13:
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return "PrintableString"; // ASCII subset
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case 0x14:
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return "TeletexString"; // aka T61String
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case 0x15:
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return "VideotexString";
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case 0x16:
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return "IA5String"; // ASCII
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case 0x17:
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return "UTCTime";
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case 0x18:
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return "GeneralizedTime";
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case 0x19:
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return "GraphicString";
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case 0x1A:
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return "VisibleString"; // ASCII subset
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case 0x1B:
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return "GeneralString";
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case 0x1C:
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return "UniversalString";
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case 0x1E:
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return "BMPString";
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}
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return "Universal_" + this.tag.tagNumber.toString();
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case 1:
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return "Application_" + this.tag.tagNumber.toString();
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case 2:
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return "[" + this.tag.tagNumber.toString() + "]"; // Context
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case 3:
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return "Private_" + this.tag.tagNumber.toString();
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}
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};
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ASN1.prototype.content = function (maxLength) {
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if (this.tag === undefined) {
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return null;
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}
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if (maxLength === undefined) {
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maxLength = Infinity;
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}
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var content = this.posContent();
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var len = Math.abs(this.length);
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if (!this.tag.isUniversal()) {
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if (this.sub !== null) {
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return "(" + this.sub.length + " elem)";
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}
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return this.stream.parseOctetString(content, content + len, maxLength);
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}
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switch (this.tag.tagNumber) {
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case 0x01: // BOOLEAN
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return (this.stream.get(content) === 0) ? "false" : "true";
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case 0x02: // INTEGER
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return this.stream.parseInteger(content, content + len);
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case 0x03: // BIT_STRING
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return this.sub ? "(" + this.sub.length + " elem)" :
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this.stream.parseBitString(content, content + len, maxLength);
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case 0x04: // OCTET_STRING
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return this.sub ? "(" + this.sub.length + " elem)" :
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this.stream.parseOctetString(content, content + len, maxLength);
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// case 0x05: // NULL
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case 0x06: // OBJECT_IDENTIFIER
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return this.stream.parseOID(content, content + len, maxLength);
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// case 0x07: // ObjectDescriptor
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// case 0x08: // EXTERNAL
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// case 0x09: // REAL
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// case 0x0A: // ENUMERATED
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// case 0x0B: // EMBEDDED_PDV
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case 0x10: // SEQUENCE
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case 0x11: // SET
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if (this.sub !== null) {
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return "(" + this.sub.length + " elem)";
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}
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else {
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return "(no elem)";
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}
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case 0x0C: // UTF8String
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return stringCut(this.stream.parseStringUTF(content, content + len), maxLength);
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case 0x12: // NumericString
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case 0x13: // PrintableString
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case 0x14: // TeletexString
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case 0x15: // VideotexString
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case 0x16: // IA5String
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// case 0x19: // GraphicString
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case 0x1A: // VisibleString
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// case 0x1B: // GeneralString
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// case 0x1C: // UniversalString
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return stringCut(this.stream.parseStringISO(content, content + len), maxLength);
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case 0x1E: // BMPString
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return stringCut(this.stream.parseStringBMP(content, content + len), maxLength);
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case 0x17: // UTCTime
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case 0x18: // GeneralizedTime
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return this.stream.parseTime(content, content + len, (this.tag.tagNumber == 0x17));
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}
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return null;
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};
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ASN1.prototype.toString = function () {
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return this.typeName() + "@" + this.stream.pos + "[header:" + this.header + ",length:" + this.length + ",sub:" + ((this.sub === null) ? "null" : this.sub.length) + "]";
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};
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ASN1.prototype.toPrettyString = function (indent) {
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if (indent === undefined) {
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indent = "";
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}
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var s = indent + this.typeName() + " @" + this.stream.pos;
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if (this.length >= 0) {
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s += "+";
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}
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s += this.length;
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if (this.tag.tagConstructed) {
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s += " (constructed)";
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}
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else if ((this.tag.isUniversal() && ((this.tag.tagNumber == 0x03) || (this.tag.tagNumber == 0x04))) && (this.sub !== null)) {
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s += " (encapsulates)";
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}
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s += "\n";
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if (this.sub !== null) {
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indent += " ";
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for (var i = 0, max = this.sub.length; i < max; ++i) {
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s += this.sub[i].toPrettyString(indent);
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}
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}
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return s;
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};
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ASN1.prototype.posStart = function () {
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return this.stream.pos;
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};
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ASN1.prototype.posContent = function () {
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return this.stream.pos + this.header;
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};
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ASN1.prototype.posEnd = function () {
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return this.stream.pos + this.header + Math.abs(this.length);
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};
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ASN1.prototype.toHexString = function () {
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return this.stream.hexDump(this.posStart(), this.posEnd(), true);
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};
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ASN1.decodeLength = function (stream) {
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var buf = stream.get();
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var len = buf & 0x7F;
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if (len == buf) {
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return len;
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}
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// no reason to use Int10, as it would be a huge buffer anyways
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if (len > 6) {
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throw new Error("Length over 48 bits not supported at position " + (stream.pos - 1));
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}
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if (len === 0) {
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return null;
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} // undefined
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buf = 0;
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for (var i = 0; i < len; ++i) {
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buf = (buf * 256) + stream.get();
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}
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return buf;
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};
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/**
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* Retrieve the hexadecimal value (as a string) of the current ASN.1 element
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* @returns {string}
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* @public
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*/
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ASN1.prototype.getHexStringValue = function () {
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var hexString = this.toHexString();
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var offset = this.header * 2;
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var length = this.length * 2;
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return hexString.substr(offset, length);
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};
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ASN1.decode = function (str) {
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var stream;
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if (!(str instanceof Stream)) {
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stream = new Stream(str, 0);
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}
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else {
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stream = str;
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}
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var streamStart = new Stream(stream);
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var tag = new ASN1Tag(stream);
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var len = ASN1.decodeLength(stream);
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var start = stream.pos;
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var header = start - streamStart.pos;
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var sub = null;
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var getSub = function () {
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var ret = [];
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if (len !== null) {
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// definite length
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var end = start + len;
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while (stream.pos < end) {
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ret[ret.length] = ASN1.decode(stream);
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}
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if (stream.pos != end) {
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throw new Error("Content size is not correct for container starting at offset " + start);
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}
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}
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else {
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// undefined length
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try {
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for (;;) {
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var s = ASN1.decode(stream);
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if (s.tag.isEOC()) {
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break;
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}
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ret[ret.length] = s;
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}
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len = start - stream.pos; // undefined lengths are represented as negative values
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}
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catch (e) {
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throw new Error("Exception while decoding undefined length content: " + e);
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}
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}
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return ret;
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};
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if (tag.tagConstructed) {
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// must have valid content
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sub = getSub();
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}
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else if (tag.isUniversal() && ((tag.tagNumber == 0x03) || (tag.tagNumber == 0x04))) {
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// sometimes BitString and OctetString are used to encapsulate ASN.1
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try {
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if (tag.tagNumber == 0x03) {
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if (stream.get() != 0) {
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throw new Error("BIT STRINGs with unused bits cannot encapsulate.");
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}
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}
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sub = getSub();
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for (var i = 0; i < sub.length; ++i) {
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if (sub[i].tag.isEOC()) {
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throw new Error("EOC is not supposed to be actual content.");
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}
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}
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}
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catch (e) {
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// but silently ignore when they don't
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sub = null;
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}
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}
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if (sub === null) {
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if (len === null) {
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throw new Error("We can't skip over an invalid tag with undefined length at offset " + start);
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}
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stream.pos = start + Math.abs(len);
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}
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return new ASN1(streamStart, header, len, tag, sub);
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};
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return ASN1;
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}());
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export { ASN1 };
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var ASN1Tag = /** @class */ (function () {
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function ASN1Tag(stream) {
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var buf = stream.get();
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this.tagClass = buf >> 6;
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this.tagConstructed = ((buf & 0x20) !== 0);
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this.tagNumber = buf & 0x1F;
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if (this.tagNumber == 0x1F) { // long tag
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var n = new Int10();
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do {
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buf = stream.get();
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n.mulAdd(128, buf & 0x7F);
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} while (buf & 0x80);
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this.tagNumber = n.simplify();
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}
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}
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ASN1Tag.prototype.isUniversal = function () {
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return this.tagClass === 0x00;
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};
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ASN1Tag.prototype.isEOC = function () {
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return this.tagClass === 0x00 && this.tagNumber === 0x00;
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};
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return ASN1Tag;
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}());
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export { ASN1Tag };
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