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287 lines
9.0 KiB
287 lines
9.0 KiB
// Copyright 2017 Joyent, Inc. |
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module.exports = { |
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read: read, |
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write: write |
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}; |
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var assert = require('assert-plus'); |
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var Buffer = require('safer-buffer').Buffer; |
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var Key = require('../key'); |
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var PrivateKey = require('../private-key'); |
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var utils = require('../utils'); |
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var SSHBuffer = require('../ssh-buffer'); |
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var Dhe = require('../dhe'); |
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var supportedAlgos = { |
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'rsa-sha1' : 5, |
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'rsa-sha256' : 8, |
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'rsa-sha512' : 10, |
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'ecdsa-p256-sha256' : 13, |
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'ecdsa-p384-sha384' : 14 |
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/* |
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* ed25519 is hypothetically supported with id 15 |
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* but the common tools available don't appear to be |
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* capable of generating/using ed25519 keys |
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*/ |
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}; |
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var supportedAlgosById = {}; |
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Object.keys(supportedAlgos).forEach(function (k) { |
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supportedAlgosById[supportedAlgos[k]] = k.toUpperCase(); |
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}); |
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function read(buf, options) { |
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if (typeof (buf) !== 'string') { |
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assert.buffer(buf, 'buf'); |
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buf = buf.toString('ascii'); |
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} |
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var lines = buf.split('\n'); |
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if (lines[0].match(/^Private-key-format\: v1/)) { |
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var algElems = lines[1].split(' '); |
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var algoNum = parseInt(algElems[1], 10); |
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var algoName = algElems[2]; |
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if (!supportedAlgosById[algoNum]) |
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throw (new Error('Unsupported algorithm: ' + algoName)); |
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return (readDNSSECPrivateKey(algoNum, lines.slice(2))); |
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} |
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// skip any comment-lines |
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var line = 0; |
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/* JSSTYLED */ |
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while (lines[line].match(/^\;/)) |
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line++; |
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// we should now have *one single* line left with our KEY on it. |
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if ((lines[line].match(/\. IN KEY /) || |
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lines[line].match(/\. IN DNSKEY /)) && lines[line+1].length === 0) { |
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return (readRFC3110(lines[line])); |
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} |
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throw (new Error('Cannot parse dnssec key')); |
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} |
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function readRFC3110(keyString) { |
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var elems = keyString.split(' '); |
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//unused var flags = parseInt(elems[3], 10); |
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//unused var protocol = parseInt(elems[4], 10); |
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var algorithm = parseInt(elems[5], 10); |
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if (!supportedAlgosById[algorithm]) |
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throw (new Error('Unsupported algorithm: ' + algorithm)); |
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var base64key = elems.slice(6, elems.length).join(); |
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var keyBuffer = Buffer.from(base64key, 'base64'); |
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if (supportedAlgosById[algorithm].match(/^RSA-/)) { |
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// join the rest of the body into a single base64-blob |
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var publicExponentLen = keyBuffer.readUInt8(0); |
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if (publicExponentLen != 3 && publicExponentLen != 1) |
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throw (new Error('Cannot parse dnssec key: ' + |
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'unsupported exponent length')); |
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var publicExponent = keyBuffer.slice(1, publicExponentLen+1); |
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publicExponent = utils.mpNormalize(publicExponent); |
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var modulus = keyBuffer.slice(1+publicExponentLen); |
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modulus = utils.mpNormalize(modulus); |
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// now, make the key |
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var rsaKey = { |
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type: 'rsa', |
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parts: [] |
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}; |
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rsaKey.parts.push({ name: 'e', data: publicExponent}); |
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rsaKey.parts.push({ name: 'n', data: modulus}); |
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return (new Key(rsaKey)); |
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} |
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if (supportedAlgosById[algorithm] === 'ECDSA-P384-SHA384' || |
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supportedAlgosById[algorithm] === 'ECDSA-P256-SHA256') { |
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var curve = 'nistp384'; |
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var size = 384; |
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if (supportedAlgosById[algorithm].match(/^ECDSA-P256-SHA256/)) { |
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curve = 'nistp256'; |
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size = 256; |
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} |
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var ecdsaKey = { |
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type: 'ecdsa', |
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curve: curve, |
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size: size, |
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parts: [ |
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{name: 'curve', data: Buffer.from(curve) }, |
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{name: 'Q', data: utils.ecNormalize(keyBuffer) } |
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] |
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}; |
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return (new Key(ecdsaKey)); |
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} |
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throw (new Error('Unsupported algorithm: ' + |
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supportedAlgosById[algorithm])); |
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} |
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function elementToBuf(e) { |
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return (Buffer.from(e.split(' ')[1], 'base64')); |
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} |
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function readDNSSECRSAPrivateKey(elements) { |
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var rsaParams = {}; |
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elements.forEach(function (element) { |
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if (element.split(' ')[0] === 'Modulus:') |
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rsaParams['n'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'PublicExponent:') |
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rsaParams['e'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'PrivateExponent:') |
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rsaParams['d'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'Prime1:') |
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rsaParams['p'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'Prime2:') |
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rsaParams['q'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'Exponent1:') |
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rsaParams['dmodp'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'Exponent2:') |
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rsaParams['dmodq'] = elementToBuf(element); |
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else if (element.split(' ')[0] === 'Coefficient:') |
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rsaParams['iqmp'] = elementToBuf(element); |
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}); |
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// now, make the key |
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var key = { |
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type: 'rsa', |
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parts: [ |
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{ name: 'e', data: utils.mpNormalize(rsaParams['e'])}, |
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{ name: 'n', data: utils.mpNormalize(rsaParams['n'])}, |
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{ name: 'd', data: utils.mpNormalize(rsaParams['d'])}, |
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{ name: 'p', data: utils.mpNormalize(rsaParams['p'])}, |
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{ name: 'q', data: utils.mpNormalize(rsaParams['q'])}, |
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{ name: 'dmodp', |
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data: utils.mpNormalize(rsaParams['dmodp'])}, |
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{ name: 'dmodq', |
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data: utils.mpNormalize(rsaParams['dmodq'])}, |
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{ name: 'iqmp', |
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data: utils.mpNormalize(rsaParams['iqmp'])} |
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] |
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}; |
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return (new PrivateKey(key)); |
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} |
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function readDNSSECPrivateKey(alg, elements) { |
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if (supportedAlgosById[alg].match(/^RSA-/)) { |
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return (readDNSSECRSAPrivateKey(elements)); |
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} |
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if (supportedAlgosById[alg] === 'ECDSA-P384-SHA384' || |
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supportedAlgosById[alg] === 'ECDSA-P256-SHA256') { |
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var d = Buffer.from(elements[0].split(' ')[1], 'base64'); |
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var curve = 'nistp384'; |
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var size = 384; |
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if (supportedAlgosById[alg] === 'ECDSA-P256-SHA256') { |
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curve = 'nistp256'; |
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size = 256; |
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} |
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// DNSSEC generates the public-key on the fly (go calculate it) |
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var publicKey = utils.publicFromPrivateECDSA(curve, d); |
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var Q = publicKey.part['Q'].data; |
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var ecdsaKey = { |
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type: 'ecdsa', |
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curve: curve, |
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size: size, |
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parts: [ |
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{name: 'curve', data: Buffer.from(curve) }, |
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{name: 'd', data: d }, |
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{name: 'Q', data: Q } |
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] |
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}; |
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return (new PrivateKey(ecdsaKey)); |
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} |
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throw (new Error('Unsupported algorithm: ' + supportedAlgosById[alg])); |
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} |
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function dnssecTimestamp(date) { |
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var year = date.getFullYear() + ''; //stringify |
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var month = (date.getMonth() + 1); |
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var timestampStr = year + month + date.getUTCDate(); |
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timestampStr += '' + date.getUTCHours() + date.getUTCMinutes(); |
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timestampStr += date.getUTCSeconds(); |
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return (timestampStr); |
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} |
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function rsaAlgFromOptions(opts) { |
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if (!opts || !opts.hashAlgo || opts.hashAlgo === 'sha1') |
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return ('5 (RSASHA1)'); |
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else if (opts.hashAlgo === 'sha256') |
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return ('8 (RSASHA256)'); |
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else if (opts.hashAlgo === 'sha512') |
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return ('10 (RSASHA512)'); |
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else |
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throw (new Error('Unknown or unsupported hash: ' + |
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opts.hashAlgo)); |
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} |
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function writeRSA(key, options) { |
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// if we're missing parts, add them. |
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if (!key.part.dmodp || !key.part.dmodq) { |
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utils.addRSAMissing(key); |
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} |
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var out = ''; |
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out += 'Private-key-format: v1.3\n'; |
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out += 'Algorithm: ' + rsaAlgFromOptions(options) + '\n'; |
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var n = utils.mpDenormalize(key.part['n'].data); |
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out += 'Modulus: ' + n.toString('base64') + '\n'; |
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var e = utils.mpDenormalize(key.part['e'].data); |
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out += 'PublicExponent: ' + e.toString('base64') + '\n'; |
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var d = utils.mpDenormalize(key.part['d'].data); |
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out += 'PrivateExponent: ' + d.toString('base64') + '\n'; |
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var p = utils.mpDenormalize(key.part['p'].data); |
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out += 'Prime1: ' + p.toString('base64') + '\n'; |
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var q = utils.mpDenormalize(key.part['q'].data); |
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out += 'Prime2: ' + q.toString('base64') + '\n'; |
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var dmodp = utils.mpDenormalize(key.part['dmodp'].data); |
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out += 'Exponent1: ' + dmodp.toString('base64') + '\n'; |
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var dmodq = utils.mpDenormalize(key.part['dmodq'].data); |
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out += 'Exponent2: ' + dmodq.toString('base64') + '\n'; |
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var iqmp = utils.mpDenormalize(key.part['iqmp'].data); |
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out += 'Coefficient: ' + iqmp.toString('base64') + '\n'; |
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// Assume that we're valid as-of now |
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var timestamp = new Date(); |
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out += 'Created: ' + dnssecTimestamp(timestamp) + '\n'; |
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out += 'Publish: ' + dnssecTimestamp(timestamp) + '\n'; |
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out += 'Activate: ' + dnssecTimestamp(timestamp) + '\n'; |
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return (Buffer.from(out, 'ascii')); |
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} |
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function writeECDSA(key, options) { |
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var out = ''; |
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out += 'Private-key-format: v1.3\n'; |
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if (key.curve === 'nistp256') { |
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out += 'Algorithm: 13 (ECDSAP256SHA256)\n'; |
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} else if (key.curve === 'nistp384') { |
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out += 'Algorithm: 14 (ECDSAP384SHA384)\n'; |
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} else { |
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throw (new Error('Unsupported curve')); |
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} |
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var base64Key = key.part['d'].data.toString('base64'); |
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out += 'PrivateKey: ' + base64Key + '\n'; |
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// Assume that we're valid as-of now |
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var timestamp = new Date(); |
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out += 'Created: ' + dnssecTimestamp(timestamp) + '\n'; |
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out += 'Publish: ' + dnssecTimestamp(timestamp) + '\n'; |
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out += 'Activate: ' + dnssecTimestamp(timestamp) + '\n'; |
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return (Buffer.from(out, 'ascii')); |
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} |
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function write(key, options) { |
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if (PrivateKey.isPrivateKey(key)) { |
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if (key.type === 'rsa') { |
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return (writeRSA(key, options)); |
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} else if (key.type === 'ecdsa') { |
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return (writeECDSA(key, options)); |
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} else { |
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throw (new Error('Unsupported algorithm: ' + key.type)); |
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} |
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} else if (Key.isKey(key)) { |
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/* |
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* RFC3110 requires a keyname, and a keytype, which we |
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* don't really have a mechanism for specifying such |
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* additional metadata. |
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*/ |
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throw (new Error('Format "dnssec" only supports ' + |
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'writing private keys')); |
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} else { |
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throw (new Error('key is not a Key or PrivateKey')); |
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} |
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}
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