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node_modules/sshpk/lib/formats/pem.js

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+// Copyright 2015 Joyent, Inc.
+
+module.exports = {
+	read: read,
+	write: write
+};
+
+var assert = require('assert-plus');
+var asn1 = require('asn1');
+var crypto = require('crypto');
+var algs = require('../algs');
+var utils = require('../utils');
+var Key = require('../key');
+var PrivateKey = require('../private-key');
+
+var pkcs1 = require('./pkcs1');
+var pkcs8 = require('./pkcs8');
+var sshpriv = require('./ssh-private');
+var rfc4253 = require('./rfc4253');
+
+var errors = require('../errors');
+
+/*
+ * For reading we support both PKCS#1 and PKCS#8. If we find a private key,
+ * we just take the public component of it and use that.
+ */
+function read(buf, options, forceType) {
+	var input = buf;
+	if (typeof (buf) !== 'string') {
+		assert.buffer(buf, 'buf');
+		buf = buf.toString('ascii');
+	}
+
+	var lines = buf.trim().split('\n');
+
+	var m = lines[0].match(/*JSSTYLED*/
+	    /[-]+[ ]*BEGIN ([A-Z0-9][A-Za-z0-9]+ )?(PUBLIC|PRIVATE) KEY[ ]*[-]+/);
+	assert.ok(m, 'invalid PEM header');
+
+	var m2 = lines[lines.length - 1].match(/*JSSTYLED*/
+	    /[-]+[ ]*END ([A-Z0-9][A-Za-z0-9]+ )?(PUBLIC|PRIVATE) KEY[ ]*[-]+/);
+	assert.ok(m2, 'invalid PEM footer');
+
+	/* Begin and end banners must match key type */
+	assert.equal(m[2], m2[2]);
+	var type = m[2].toLowerCase();
+
+	var alg;
+	if (m[1]) {
+		/* They also must match algorithms, if given */
+		assert.equal(m[1], m2[1], 'PEM header and footer mismatch');
+		alg = m[1].trim();
+	}
+
+	var headers = {};
+	while (true) {
+		lines = lines.slice(1);
+		m = lines[0].match(/*JSSTYLED*/
+		    /^([A-Za-z0-9-]+): (.+)$/);
+		if (!m)
+			break;
+		headers[m[1].toLowerCase()] = m[2];
+	}
+
+	var cipher, key, iv;
+	if (headers['proc-type']) {
+		var parts = headers['proc-type'].split(',');
+		if (parts[0] === '4' && parts[1] === 'ENCRYPTED') {
+			if (typeof (options.passphrase) === 'string') {
+				options.passphrase = new Buffer(
+				    options.passphrase, 'utf-8');
+			}
+			if (!Buffer.isBuffer(options.passphrase)) {
+				throw (new errors.KeyEncryptedError(
+				    options.filename, 'PEM'));
+			} else {
+				parts = headers['dek-info'].split(',');
+				assert.ok(parts.length === 2);
+				cipher = parts[0].toLowerCase();
+				iv = new Buffer(parts[1], 'hex');
+				key = utils.opensslKeyDeriv(cipher, iv,
+				    options.passphrase, 1).key;
+			}
+		}
+	}
+
+	/* Chop off the first and last lines */
+	lines = lines.slice(0, -1).join('');
+	buf = new Buffer(lines, 'base64');
+
+	if (cipher && key && iv) {
+		var cipherStream = crypto.createDecipheriv(cipher, key, iv);
+		var chunk, chunks = [];
+		cipherStream.once('error', function (e) {
+			if (e.toString().indexOf('bad decrypt') !== -1) {
+				throw (new Error('Incorrect passphrase ' +
+				    'supplied, could not decrypt key'));
+			}
+			throw (e);
+		});
+		cipherStream.write(buf);
+		cipherStream.end();
+		while ((chunk = cipherStream.read()) !== null)
+			chunks.push(chunk);
+		buf = Buffer.concat(chunks);
+	}
+
+	/* The new OpenSSH internal format abuses PEM headers */
+	if (alg && alg.toLowerCase() === 'openssh')
+		return (sshpriv.readSSHPrivate(type, buf, options));
+	if (alg && alg.toLowerCase() === 'ssh2')
+		return (rfc4253.readType(type, buf, options));
+
+	var der = new asn1.BerReader(buf);
+	der.originalInput = input;
+
+	/*
+	 * All of the PEM file types start with a sequence tag, so chop it
+	 * off here
+	 */
+	der.readSequence();
+
+	/* PKCS#1 type keys name an algorithm in the banner explicitly */
+	if (alg) {
+		if (forceType)
+			assert.strictEqual(forceType, 'pkcs1');
+		return (pkcs1.readPkcs1(alg, type, der));
+	} else {
+		if (forceType)
+			assert.strictEqual(forceType, 'pkcs8');
+		return (pkcs8.readPkcs8(alg, type, der));
+	}
+}
+
+function write(key, options, type) {
+	assert.object(key);
+
+	var alg = {
+	    'ecdsa': 'EC',
+	    'rsa': 'RSA',
+	    'dsa': 'DSA',
+	    'ed25519': 'EdDSA'
+	}[key.type];
+	var header;
+
+	var der = new asn1.BerWriter();
+
+	if (PrivateKey.isPrivateKey(key)) {
+		if (type && type === 'pkcs8') {
+			header = 'PRIVATE KEY';
+			pkcs8.writePkcs8(der, key);
+		} else {
+			if (type)
+				assert.strictEqual(type, 'pkcs1');
+			header = alg + ' PRIVATE KEY';
+			pkcs1.writePkcs1(der, key);
+		}
+
+	} else if (Key.isKey(key)) {
+		if (type && type === 'pkcs1') {
+			header = alg + ' PUBLIC KEY';
+			pkcs1.writePkcs1(der, key);
+		} else {
+			if (type)
+				assert.strictEqual(type, 'pkcs8');
+			header = 'PUBLIC KEY';
+			pkcs8.writePkcs8(der, key);
+		}
+
+	} else {
+		throw (new Error('key is not a Key or PrivateKey'));
+	}
+
+	var tmp = der.buffer.toString('base64');
+	var len = tmp.length + (tmp.length / 64) +
+	    18 + 16 + header.length*2 + 10;
+	var buf = new Buffer(len);
+	var o = 0;
+	o += buf.write('-----BEGIN ' + header + '-----\n', o);
+	for (var i = 0; i < tmp.length; ) {
+		var limit = i + 64;
+		if (limit > tmp.length)
+			limit = tmp.length;
+		o += buf.write(tmp.slice(i, limit), o);
+		buf[o++] = 10;
+		i = limit;
+	}
+	o += buf.write('-----END ' + header + '-----\n', o);
+
+	return (buf.slice(0, o));
+}