148 lines
3.3 KiB
JavaScript
148 lines
3.3 KiB
JavaScript
(function(exports) {
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'use strict';
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if (!exports.ASN1) {
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exports.ASN1 = {};
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}
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if (!exports.Enc) {
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exports.Enc = {};
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}
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if (!exports.PEM) {
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exports.PEM = {};
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}
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var ASN1 = exports.ASN1;
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var Enc = exports.Enc;
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var PEM = exports.PEM;
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//
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// Packer
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//
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// Almost every ASN.1 type that's important for CSR
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// can be represented generically with only a few rules.
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exports.ASN1 = function ASN1(/*type, hexstrings...*/) {
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var args = Array.prototype.slice.call(arguments);
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var typ = args.shift();
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var str = args
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.join('')
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.replace(/\s+/g, '')
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.toLowerCase();
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var len = str.length / 2;
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var lenlen = 0;
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var hex = typ;
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// We can't have an odd number of hex chars
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if (len !== Math.round(len)) {
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throw new Error('invalid hex');
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}
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// The first byte of any ASN.1 sequence is the type (Sequence, Integer, etc)
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// The second byte is either the size of the value, or the size of its size
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// 1. If the second byte is < 0x80 (128) it is considered the size
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// 2. If it is > 0x80 then it describes the number of bytes of the size
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// ex: 0x82 means the next 2 bytes describe the size of the value
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// 3. The special case of exactly 0x80 is "indefinite" length (to end-of-file)
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if (len > 127) {
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lenlen += 1;
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while (len > 255) {
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lenlen += 1;
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len = len >> 8;
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}
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}
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if (lenlen) {
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hex += Enc.numToHex(0x80 + lenlen);
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}
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return hex + Enc.numToHex(str.length / 2) + str;
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};
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// The Integer type has some special rules
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ASN1.UInt = function UINT() {
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var str = Array.prototype.slice.call(arguments).join('');
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var first = parseInt(str.slice(0, 2), 16);
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// If the first byte is 0x80 or greater, the number is considered negative
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// Therefore we add a '00' prefix if the 0x80 bit is set
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if (0x80 & first) {
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str = '00' + str;
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}
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return ASN1('02', str);
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};
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// The Bit String type also has a special rule
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ASN1.BitStr = function BITSTR() {
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var str = Array.prototype.slice.call(arguments).join('');
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// '00' is a mask of how many bits of the next byte to ignore
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return ASN1('03', '00' + str);
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};
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ASN1.pack = function(arr) {
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var typ = Enc.numToHex(arr[0]);
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var str = '';
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if (Array.isArray(arr[1])) {
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arr[1].forEach(function(a) {
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str += ASN1.pack(a);
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});
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} else if ('string' === typeof arr[1]) {
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str = arr[1];
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} else {
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throw new Error('unexpected array');
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}
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if ('03' === typ) {
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return ASN1.BitStr(str);
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} else if ('02' === typ) {
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return ASN1.UInt(str);
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} else {
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return ASN1(typ, str);
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}
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};
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Object.keys(ASN1).forEach(function(k) {
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exports.ASN1[k] = ASN1[k];
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});
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ASN1 = exports.ASN1;
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PEM.packBlock = function(opts) {
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// TODO allow for headers?
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return (
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'-----BEGIN ' +
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opts.type +
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'-----\n' +
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Enc.bufToBase64(opts.bytes)
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.match(/.{1,64}/g)
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.join('\n') +
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'\n' +
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'-----END ' +
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opts.type +
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'-----'
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);
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};
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Enc.bufToBase64 = function(u8) {
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var bin = '';
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u8.forEach(function(i) {
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bin += String.fromCharCode(i);
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});
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return btoa(bin);
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};
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Enc.hexToBuf = function(hex) {
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var arr = [];
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hex.match(/.{2}/g).forEach(function(h) {
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arr.push(parseInt(h, 16));
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});
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return 'undefined' !== typeof Uint8Array ? new Uint8Array(arr) : arr;
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};
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Enc.numToHex = function(d) {
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d = d.toString(16);
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if (d.length % 2) {
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return '0' + d;
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}
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return d;
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};
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})('undefined' !== typeof window ? window : module.exports);
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