464 lines
15 KiB
JavaScript
464 lines
15 KiB
JavaScript
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'use strict';
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var crypto = require('crypto');
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// 1.2.840.10045.3.1.7
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// prime256v1 (ANSI X9.62 named elliptic curve)
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var OBJ_ID_EC = '06 08 2A8648CE3D030107'.replace(/\s+/g, '').toLowerCase();
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function fromBase64(b64) {
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var buf;
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var ab;
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if ('undefined' === typeof atob) {
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buf = Buffer.from(b64, 'base64');
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return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength);
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}
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buf = atob(b64);
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ab = new ArrayBuffer(buf.length);
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ab = new Uint8Array(ab);
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buf.split('').forEach(function (ch, i) {
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ab[i] = ch.charCodeAt(0);
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});
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return ab.buffer;
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}
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function parsePem(pem) {
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var typ;
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var pub;
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var crv;
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var der = fromBase64(pem.split(/\n/).filter(function (line, i) {
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if (0 === i) {
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if (/ PUBLIC /.test(line)) {
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pub = true;
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} else if (/ PRIVATE /.test(line)) {
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pub = false;
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}
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if (/ EC/.test(line)) {
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typ = 'EC';
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}
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}
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return !/---/.test(line);
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}).join(''));
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if (!typ || 'EC' === typ) {
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var hex = toHex(der).toLowerCase();
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if (-1 !== hex.indexOf(OBJ_ID_EC)) {
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typ = 'EC';
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crv = 'P-256';
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} else {
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// TODO more than just P-256
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console.warn("unsupported ec curve");
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}
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}
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return { typ: typ, pub: pub, der: der, crv: crv };
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}
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function toHex(ab) {
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var hex = [];
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var u8 = new Uint8Array(ab);
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var size = u8.byteLength;
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var i;
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var h;
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for (i = 0; i < size; i += 1) {
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h = u8[i].toString(16);
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if (2 === h.length) {
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hex.push(h);
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} else {
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hex.push('0' + h);
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}
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}
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return hex.join('');
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}
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function fromHex(hex) {
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if ('undefined' !== typeof Buffer) {
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return Buffer.from(hex, 'hex');
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}
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var ab = new ArrayBuffer(hex.length/2);
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var i;
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var j;
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ab = new Uint8Array(ab);
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for (i = 0, j = 0; i < (hex.length/2); i += 1) {
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ab[i] = parseInt(hex.slice(j, j+1), 16);
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j += 2;
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}
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return ab.buffer;
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}
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function readEcPubkey(der) {
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// the key is the last 520 bits of both the private key and the public key
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// he 3 bits prior identify the key as
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var x, y;
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var compressed;
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var keylen = 32;
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var offset = 64;
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var headerSize = 4;
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var header = toHex(der.slice(der.byteLength - (offset + headerSize), der.byteLength - offset));
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if ('03420004' !== header) {
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offset = 32;
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header = toHex(der.slice(der.byteLength - (offset + headerSize), der.byteLength - offset));
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if ('03420002' !== header) {
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throw new Error("not a valid EC P-256 key (expected 0x0342004 or 0x0342002 as pub key preamble, but found " + header + ")");
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}
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}
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// The one good thing that came from the b***kchain hysteria: good EC documentation
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// https://davidederosa.com/basic-blockchain-programming/elliptic-curve-keys/
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compressed = ('2' === header[header.byteLength -1]);
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x = der.slice(der.byteLength - offset, (der.byteLength - offset) + keylen);
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if (!compressed) {
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y = der.slice(der.byteLength - keylen, der.byteLength);
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}
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return {
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x: x
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, y: y || null
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};
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}
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function formatAsPem(str) {
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var finalString = '';
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while (str.length > 0) {
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finalString += str.substring(0, 64) + '\n';
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str = str.substring(64);
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}
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return finalString;
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}
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function toBase64(der) {
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if ('undefined' === typeof btoa) {
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return Buffer.from(der).toString('base64');
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}
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var chs = [];
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der.forEach(function (b) {
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chs.push(String.fromCharCode(b));
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});
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return btoa(chs.join(''));
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}
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// these are static ASN.1 segments
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// The head specifies that there will be 3 segments and a content length
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// (those segments will be content, signature header, and signature)
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var csrHead = '30 82 {0seq0len}'.replace(/\s+/g, '');
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// The tail specifies the ES256 signature header (and is followed by the signature
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var csrEcFoot =
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( '30 0A'
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// 1.2.840.10045.4.3.2 ecdsaWithSHA256
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// (ANSI X9.62 ECDSA algorithm with SHA256)
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+ '06 08 2A 86 48 CE 3D 04 03 02'
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+ '03 {len} 00' // bit stream (why??)
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+ '30 {rslen}' // sequence
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+ '02 {rlen} {r}' // integer r
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+ '02 {slen} {s}' // integer s
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).replace(/\s+/g, '');
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var csrDomains = '82 {dlen} {domain.tld}'; // 2+n bytes (type 82?)
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function strToHex(str) {
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return str.split('').map(function (ch) {
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var h = ch.charCodeAt(0).toString(16);
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if (2 === h.length) {
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return h;
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}
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return '0' + h;
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}).join('');
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}
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function numToHex(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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function fromHex(hex) {
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if ('undefined' !== typeof Buffer) {
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return Buffer.from(hex, 'hex');
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}
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var ab = new ArrayBuffer(hex.length/2);
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var i;
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var j;
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ab = new Uint8Array(ab);
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for (i = 0, j = 0; i < (hex.length/2); i += 1) {
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ab[i] = parseInt(hex.slice(j, j+1), 16);
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j += 2;
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}
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return ab.buffer;
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}
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function createCsrBodyEc(domains, xy) {
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var altnames = domains.map(function (d) {
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return csrDomains.replace(/{dlen}/, numToHex(d.length)).replace(/{domain\.tld}/, strToHex(d));
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}).join('').replace(/\s+/g, '');
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var sublen = domains[0].length;
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var sanlen = (altnames.length/2);
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var publen = xy.x.byteLength;
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var compression = '04';
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var hxy = '';
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// 04 == x+y, 02 == x-only
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if (xy.y) {
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publen += xy.y.byteLength;
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} else {
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// Note: I don't intend to support compression - it isn't used by most
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// libraries and it requir more dependencies for bigint ops to deflate.
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// This is more just a placeholder. It won't work right now anyway
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// because compression requires an exta bit stored (odd vs even), which
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// I haven't learned yet, and I'm not sure if it's allowed at all
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compression = '02';
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}
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hxy += toHex(xy.x);
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if (xy.y) {
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hxy += toHex(xy.y);
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}
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var body = [ '30 81 {+85+n}' // 4 bytes, sequence
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.replace(/{[^}]+}/, numToHex(
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3
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+ 13 + sublen
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+ 27 + publen // Length for EC-related P-256 stuff
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+ 30 + sanlen
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))
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// #0 Total 3
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, '02 01 00' // 3 bytes, int 0
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// Subject
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// #1 Total 2+11+n
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, '30 {3.2.0seqlen}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(2+2+5+2+sublen))
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, '31 {4.3.0setlen}' // 2 bytes, set
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.replace(/{[^}]+}/, numToHex(2+5+2+sublen))
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, '30 {5.4.0seqlen}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(5+2+sublen))
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, '06 03 55 04 03' // 5 bytes, object id (commonName)
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, '0C {dlen} {domain.tld}' // 2+n bytes, utf8string
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.replace(/{dlen}/, numToHex(sublen))
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.replace(/{domain\.tld}/, strToHex(domains[0]))
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// P-256 Public Key
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// #2 Total 2+25+xy
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, '30 {+25+xy}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(2+9+10+3+1+publen))
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, '30 13' // 2 bytes, sequence
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// 1.2.840.10045.2.1 ecPublicKey
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// (ANSI X9.62 public key type)
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, '06 07 2A 86 48 CE 3D 02 01' // 9 bytes, object id
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// 1.2.840.10045.3.1.7 prime256v1
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// (ANSI X9.62 named elliptic curve)
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, '06 08 2A 86 48 CE 3D 03 01 07' // 10 bytes, object id
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, '03 {xylen} 00 {xy}' // 3+1+n bytes
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.replace(/{xylen}/, numToHex(publen+2))
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.replace(/{xy}/, compression + hxy)
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// Altnames
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// #3 Total 2+28+n
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, 'A0 {+28}' // 2 bytes, ?? [4B]
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.replace(/{[^}]+}/, numToHex(2+11+2+2+2+5+2+2+sanlen))
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, '30 {+26}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(11+2+2+2+5+2+2+sanlen))
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// (extensionRequest (PKCS #9 via CRMF))
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, '06 09 2A 86 48 86 F7 0D 01 09 0E' // 11 bytes, object id
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, '31 {+13}' // 2 bytes, set
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.replace(/{[^}]+}/, numToHex(2+2+5+2+2+sanlen))
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, '30 {+11}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(2+5+2+2+sanlen))
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, '30 {+9}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(5+2+2+sanlen))
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// (subjectAltName (X.509 extension))
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, '06 03 55 1D 11' // 5 bytes, object id
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, '04 {+2}' // 2 bytes, octet string
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.replace(/{[^}]+}/, numToHex(2+sanlen))
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, '30 {+n}' // 2 bytes, sequence
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.replace(/{[^}]+}/, numToHex(sanlen))
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, '{altnames}' // n (elements of sequence)
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.replace(/{altnames}/, altnames)
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];
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body = body.join('').replace(/\s+/g, '');
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return fromHex(body);
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}
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// https://gist.github.com/codermapuche/da4f96cdb6d5ff53b7ebc156ec46a10a
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function signEc(keypem, ab) {
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// Signer is a stream
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var sign = crypto.createSign('SHA256');
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sign.write(new Uint8Array(ab));
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sign.end();
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// The signature is ASN1 encoded
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var sig = sign.sign(keypem);
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// Convert to a JavaScript ArrayBuffer just because
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sig = new Uint8Array(sig.buffer.slice(sig.byteOffset, sig.byteOffset + sig.byteLength));
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// The first two bytes '30 xx' signify SEQUENCE and LENGTH
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// The sequence length byte will be a single byte because the signature is less that 128 bytes (0x80, 1024-bit)
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// (this would not be true for P-521, but I'm not supporting that yet)
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// The 3rd byte will be '02', signifying INTEGER
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// The 4th byte will tell us the length of 'r' (which, on occassion, will be less than the full 255 bytes)
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var rIndex = 3;
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var rLen = sig[rIndex];
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var rEnd = rIndex + 1 + rLen;
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var sIndex = rEnd + 1;
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var sLen = sig[sIndex];
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var sEnd = sIndex + 1 + sLen;
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var r = sig.slice(rIndex + 1, rEnd);
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var s = sig.slice(sIndex + 1, sEnd); // this should be end-of-file
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// ASN1 INTEGER types use the high-order bit to signify a negative number,
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// hence a leading '00' is used for numbers that begin with '80' or greater
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// which is why r length is sometimes a byte longer than its bit length
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if (0 === s[0]) { s = s.slice(1); }
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if (0 === r[0]) { r = r.slice(1); }
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return { raw: sig.buffer, r: r.buffer, s: s.buffer };
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}
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function createEcCsr(domains, keypem, ecpub) {
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// TODO get pub from priv
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var csrBody = createCsrBodyEc(domains, ecpub);
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var sig = signEc(keypem, csrBody);
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var rLen = sig.r.byteLength;
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var rc = '';
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var sLen = sig.s.byteLength;
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var sc = '';
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if (0x80 & new Uint8Array(sig.r)[0]) { rc = '00'; rLen += 1; }
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if (0x80 & new Uint8Array(sig.s)[0]) { sc = '00'; sLen += 1; }
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var csrSig = csrEcFoot
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.replace(/{len}/, numToHex(1 + 2 + 2 + 2 + rLen + sLen))
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.replace(/{rslen}/, numToHex(2 + 2 + rLen + sLen))
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.replace(/{rlen}/, numToHex(rLen))
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.replace(/{r}/, rc + toHex(sig.r))
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.replace(/{slen}/, numToHex(sLen))
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.replace(/{s}/, sc + toHex(sig.s))
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;
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// Note: If we supported P-521 a number of the lengths would change
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// by one byte and that would be... annoying to update
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var len = csrBody.byteLength + (csrSig.length/2);
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/*
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console.log('sig:', sig.raw.byteLength, toHex(sig.raw));
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||
|
|
console.log('r:', sig.r.byteLength, toHex(sig.r));
|
||
|
|
console.log('s:', sig.s.byteLength, toHex(sig.s));
|
||
|
|
console.log('csr sig:', csrSig.length / 2, csrSig);
|
||
|
|
console.log('csrBodyLen + csrSigLen', numToHex(len));
|
||
|
|
*/
|
||
|
|
var head = csrHead.replace(/{[^}]+}/, numToHex(len));
|
||
|
|
var ab = new Uint8Array(new ArrayBuffer((head.length/2) + len));
|
||
|
|
var i = 0;
|
||
|
|
fromHex(head).forEach(function (b) {
|
||
|
|
ab[i] = b;
|
||
|
|
i += 1;
|
||
|
|
});
|
||
|
|
csrBody.forEach(function (b) {
|
||
|
|
ab[i] = b;
|
||
|
|
i += 1;
|
||
|
|
});
|
||
|
|
fromHex(csrSig).forEach(function (b) {
|
||
|
|
ab[i] = b;
|
||
|
|
i += 1;
|
||
|
|
});
|
||
|
|
|
||
|
|
return ab;
|
||
|
|
}
|
||
|
|
|
||
|
|
function createEcCsrPem(domains, keypem) {
|
||
|
|
var pemblock = parsePem(keypem);
|
||
|
|
var ecpub = readEcPubkey(pemblock.der);
|
||
|
|
var ab = createEcCsr(domains, keypem, ecpub);
|
||
|
|
var pem = formatAsPem(toBase64(ab));
|
||
|
|
return '-----BEGIN CERTIFICATE REQUEST-----\n' + pem + '-----END CERTIFICATE REQUEST-----';
|
||
|
|
}
|
||
|
|
|
||
|
|
// Taken from Unibabel
|
||
|
|
// https://git.coolaj86.com/coolaj86/unibabel.js#readme
|
||
|
|
// https://coolaj86.com/articles/base64-unicode-utf-8-javascript-and-you/
|
||
|
|
function utf8ToUint8Array(str) {
|
||
|
|
var escstr = encodeURIComponent(str);
|
||
|
|
// replaces any uri escape sequence, such as %0A,
|
||
|
|
// with binary escape, such as 0x0A
|
||
|
|
var binstr = escstr.replace(/%([0-9A-F]{2})/g, function(match, p1) {
|
||
|
|
return String.fromCharCode('0x' + p1);
|
||
|
|
});
|
||
|
|
var buf = new Uint8Array(binstr.length);
|
||
|
|
binstr.split('').forEach(function (ch, i) {
|
||
|
|
buf[i] = ch.charCodeAt(0);
|
||
|
|
});
|
||
|
|
|
||
|
|
return buf;
|
||
|
|
}
|
||
|
|
|
||
|
|
function ensurePem(key) {
|
||
|
|
if (!key) { throw new Error("no private key given"); }
|
||
|
|
// whether PEM or DER, convert to Uint8Array
|
||
|
|
if ('string' === typeof key) { key = utf8ToUint8Array(key); }
|
||
|
|
|
||
|
|
// for consistency
|
||
|
|
if (key instanceof Buffer) { key = new Uint8Array(key.buffer.slice(key.byteOffset, key.byteOffset + key.byteLength)); }
|
||
|
|
|
||
|
|
// just as a sanity check
|
||
|
|
if (key instanceof Array) {
|
||
|
|
key = Uint8Array.from(key);
|
||
|
|
if (!key.every(function (el) {
|
||
|
|
return ('number' === typeof el) && (el >= 0) && (el <= 255);
|
||
|
|
})) {
|
||
|
|
throw new Error("key was an array, but not an array of ints between 0 and 255");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// no matter which path we take, we should arrive at a Uint8Array
|
||
|
|
if (!(key instanceof Uint8Array)) {
|
||
|
|
throw new Error("typeof key is '" + typeof key + "', not any of the supported types: utf8 string,"
|
||
|
|
+ " binary string, node Buffer, Uint8Array, or Array of ints between 0 and 255");
|
||
|
|
}
|
||
|
|
|
||
|
|
// if DER, convert to PEM
|
||
|
|
if ((0x30 === key[0]) && (0x80 & key[1])) {
|
||
|
|
key = toBase64(key);
|
||
|
|
}
|
||
|
|
key = [].map.call(key, function (i) {
|
||
|
|
return String.fromCharCode(i);
|
||
|
|
}).join('');
|
||
|
|
if ('M' === key[0]) {
|
||
|
|
key = '-----BEGIN EC PRIVATE KEY-----\n' + key + '-----END EC PRIVATE KEY-----';
|
||
|
|
}
|
||
|
|
if ('-' === key[0]) {
|
||
|
|
return key;
|
||
|
|
} else {
|
||
|
|
throw new Error("key does not appear to be in PEM formt (does not begin with either '-' or 'M'),"
|
||
|
|
+ " nor DER format (does not begin with 0x308X)");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*global Promise*/
|
||
|
|
module.exports = function (opts) {
|
||
|
|
// We're using a Promise here to be compatible with the browser version
|
||
|
|
// which uses the webcrypto API for some of the conversions
|
||
|
|
return Promise.resolve().then(function () {
|
||
|
|
|
||
|
|
// We do a bit of extra error checking for user convenience
|
||
|
|
if (!opts) { throw new Error("You must pass options with key and domains to ecdsacsr"); }
|
||
|
|
if (!Array.isArray(opts.domains) || 0 === opts.domains.length) {
|
||
|
|
new Error("You must pass options.domains as a non-empty array");
|
||
|
|
}
|
||
|
|
|
||
|
|
// I need to check that 例.中国 is a valid domain name
|
||
|
|
if (!opts.domains.every(function (d) {
|
||
|
|
// allow punycode? xn--
|
||
|
|
if ('string' === typeof d /*&& /\./.test(d) && !/--/.test(d)*/) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
})) {
|
||
|
|
throw new Error("You must pass options.domains as utf8 strings (not punycode)");
|
||
|
|
}
|
||
|
|
var key = ensurePem(opts.key);
|
||
|
|
|
||
|
|
return createEcCsrPem(opts.domains, key);
|
||
|
|
});
|
||
|
|
};
|