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keyParser.js
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keyParser.js
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// TODO:
// * utilize `crypto.create(Private|Public)Key()` and `keyObject.export()`
// * handle multi-line header values (OpenSSH)?
// * more thorough validation?
var crypto = require('crypto');
var cryptoSign = crypto.sign;
var cryptoVerify = crypto.verify;
var createSign = crypto.createSign;
var createVerify = crypto.createVerify;
var createDecipheriv = crypto.createDecipheriv;
var createHash = crypto.createHash;
var createHmac = crypto.createHmac;
var supportedOpenSSLCiphers = crypto.getCiphers();
var utils;
var Ber = require('asn1').Ber;
var bcrypt_pbkdf = require('bcrypt-pbkdf').pbkdf;
var bufferHelpers = require('./buffer-helpers');
var readUInt32BE = bufferHelpers.readUInt32BE;
var writeUInt32BE = bufferHelpers.writeUInt32BE;
var constants = require('./constants');
var SUPPORTED_CIPHER = constants.ALGORITHMS.SUPPORTED_CIPHER;
var CIPHER_INFO = constants.CIPHER_INFO;
var SSH_TO_OPENSSL = constants.SSH_TO_OPENSSL;
var EDDSA_SUPPORTED = constants.EDDSA_SUPPORTED;
var SYM_HASH_ALGO = Symbol('Hash Algorithm');
var SYM_PRIV_PEM = Symbol('Private key PEM');
var SYM_PUB_PEM = Symbol('Public key PEM');
var SYM_PUB_SSH = Symbol('Public key SSH');
var SYM_DECRYPTED = Symbol('Decrypted Key');
// Create OpenSSL cipher name -> SSH cipher name conversion table
var CIPHER_INFO_OPENSSL = Object.create(null);
(function() {
var keys = Object.keys(CIPHER_INFO);
for (var i = 0; i < keys.length; ++i) {
var cipherName = SSH_TO_OPENSSL[keys[i]];
if (!cipherName || CIPHER_INFO_OPENSSL[cipherName])
continue;
CIPHER_INFO_OPENSSL[cipherName] = CIPHER_INFO[keys[i]];
}
})();
var trimStart = (function() {
if (typeof String.prototype.trimStart === 'function') {
return function trimStart(str) {
return str.trimStart();
};
}
return function trimStart(str) {
var start = 0;
for (var i = 0; i < str.length; ++i) {
switch (str.charCodeAt(i)) {
case 32: // ' '
case 9: // '\t'
case 13: // '\r'
case 10: // '\n'
case 12: // '\f'
++start;
continue;
}
break;
}
if (start === 0)
return str;
return str.slice(start);
};
})();
function makePEM(type, data) {
data = data.toString('base64');
return '-----BEGIN ' + type + ' KEY-----\n'
+ data.replace(/.{64}/g, '$&\n')
+ (data.length % 64 ? '\n' : '')
+ '-----END ' + type + ' KEY-----';
}
function combineBuffers(buf1, buf2) {
var result = Buffer.allocUnsafe(buf1.length + buf2.length);
buf1.copy(result, 0);
buf2.copy(result, buf1.length);
return result;
}
function skipFields(buf, nfields) {
var bufLen = buf.length;
var pos = (buf._pos || 0);
for (var i = 0; i < nfields; ++i) {
var left = (bufLen - pos);
if (pos >= bufLen || left < 4)
return false;
var len = readUInt32BE(buf, pos);
if (left < 4 + len)
return false;
pos += 4 + len;
}
buf._pos = pos;
return true;
}
function genOpenSSLRSAPub(n, e) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
// algorithm
asnWriter.startSequence();
asnWriter.writeOID('1.2.840.113549.1.1.1'); // rsaEncryption
// algorithm parameters (RSA has none)
asnWriter.writeNull();
asnWriter.endSequence();
// subjectPublicKey
asnWriter.startSequence(Ber.BitString);
asnWriter.writeByte(0x00);
asnWriter.startSequence();
asnWriter.writeBuffer(n, Ber.Integer);
asnWriter.writeBuffer(e, Ber.Integer);
asnWriter.endSequence();
asnWriter.endSequence();
asnWriter.endSequence();
return makePEM('PUBLIC', asnWriter.buffer);
}
function genOpenSSHRSAPub(n, e) {
var publicKey = Buffer.allocUnsafe(4 + 7 // "ssh-rsa"
+ 4 + n.length
+ 4 + e.length);
writeUInt32BE(publicKey, 7, 0);
publicKey.write('ssh-rsa', 4, 7, 'ascii');
var i = 4 + 7;
writeUInt32BE(publicKey, e.length, i);
e.copy(publicKey, i += 4);
writeUInt32BE(publicKey, n.length, i += e.length);
n.copy(publicKey, i + 4);
return publicKey;
}
var genOpenSSLRSAPriv = (function() {
function genRSAASN1Buf(n, e, d, p, q, dmp1, dmq1, iqmp) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
asnWriter.writeInt(0x00, Ber.Integer);
asnWriter.writeBuffer(n, Ber.Integer);
asnWriter.writeBuffer(e, Ber.Integer);
asnWriter.writeBuffer(d, Ber.Integer);
asnWriter.writeBuffer(p, Ber.Integer);
asnWriter.writeBuffer(q, Ber.Integer);
asnWriter.writeBuffer(dmp1, Ber.Integer);
asnWriter.writeBuffer(dmq1, Ber.Integer);
asnWriter.writeBuffer(iqmp, Ber.Integer);
asnWriter.endSequence();
return asnWriter.buffer;
}
function bigIntFromBuffer(buf) {
return BigInt('0x' + buf.toString('hex'));
}
function bigIntToBuffer(bn) {
var hex = bn.toString(16);
if ((hex.length & 1) !== 0) {
hex = '0' + hex;
} else {
var sigbit = hex.charCodeAt(0);
// BER/DER integers require leading zero byte to denote a positive value
// when first byte >= 0x80
if (sigbit === 56 || (sigbit >= 97 && sigbit <= 102))
hex = '00' + hex;
}
return Buffer.from(hex, 'hex');
}
// Feature detect native BigInt availability and use it when possible
try {
var code = [
'return function genOpenSSLRSAPriv(n, e, d, iqmp, p, q) {',
' var bn_d = bigIntFromBuffer(d);',
' var dmp1 = bigIntToBuffer(bn_d % (bigIntFromBuffer(p) - 1n));',
' var dmq1 = bigIntToBuffer(bn_d % (bigIntFromBuffer(q) - 1n));',
' return makePEM(\'RSA PRIVATE\', '
+ 'genRSAASN1Buf(n, e, d, p, q, dmp1, dmq1, iqmp));',
'};'
].join('\n');
return new Function(
'bigIntFromBuffer, bigIntToBuffer, makePEM, genRSAASN1Buf',
code
)(bigIntFromBuffer, bigIntToBuffer, makePEM, genRSAASN1Buf);
} catch (ex) {
return (function() {
var BigInteger = require('./jsbn.js');
return function genOpenSSLRSAPriv(n, e, d, iqmp, p, q) {
var pbi = new BigInteger(p, 256);
var qbi = new BigInteger(q, 256);
var dbi = new BigInteger(d, 256);
var dmp1bi = dbi.mod(pbi.subtract(BigInteger.ONE));
var dmq1bi = dbi.mod(qbi.subtract(BigInteger.ONE));
var dmp1 = Buffer.from(dmp1bi.toByteArray());
var dmq1 = Buffer.from(dmq1bi.toByteArray());
return makePEM('RSA PRIVATE',
genRSAASN1Buf(n, e, d, p, q, dmp1, dmq1, iqmp));
};
})();
}
})();
function genOpenSSLDSAPub(p, q, g, y) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
// algorithm
asnWriter.startSequence();
asnWriter.writeOID('1.2.840.10040.4.1'); // id-dsa
// algorithm parameters
asnWriter.startSequence();
asnWriter.writeBuffer(p, Ber.Integer);
asnWriter.writeBuffer(q, Ber.Integer);
asnWriter.writeBuffer(g, Ber.Integer);
asnWriter.endSequence();
asnWriter.endSequence();
// subjectPublicKey
asnWriter.startSequence(Ber.BitString);
asnWriter.writeByte(0x00);
asnWriter.writeBuffer(y, Ber.Integer);
asnWriter.endSequence();
asnWriter.endSequence();
return makePEM('PUBLIC', asnWriter.buffer);
}
function genOpenSSHDSAPub(p, q, g, y) {
var publicKey = Buffer.allocUnsafe(4 + 7 // ssh-dss
+ 4 + p.length
+ 4 + q.length
+ 4 + g.length
+ 4 + y.length);
writeUInt32BE(publicKey, 7, 0);
publicKey.write('ssh-dss', 4, 7, 'ascii');
var i = 4 + 7;
writeUInt32BE(publicKey, p.length, i);
p.copy(publicKey, i += 4);
writeUInt32BE(publicKey, q.length, i += p.length);
q.copy(publicKey, i += 4);
writeUInt32BE(publicKey, g.length, i += q.length);
g.copy(publicKey, i += 4);
writeUInt32BE(publicKey, y.length, i += g.length);
y.copy(publicKey, i + 4);
return publicKey;
}
function genOpenSSLDSAPriv(p, q, g, y, x) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
asnWriter.writeInt(0x00, Ber.Integer);
asnWriter.writeBuffer(p, Ber.Integer);
asnWriter.writeBuffer(q, Ber.Integer);
asnWriter.writeBuffer(g, Ber.Integer);
asnWriter.writeBuffer(y, Ber.Integer);
asnWriter.writeBuffer(x, Ber.Integer);
asnWriter.endSequence();
return makePEM('DSA PRIVATE', asnWriter.buffer);
}
function genOpenSSLEdPub(pub) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
// algorithm
asnWriter.startSequence();
asnWriter.writeOID('1.3.101.112'); // id-Ed25519
asnWriter.endSequence();
// PublicKey
asnWriter.startSequence(Ber.BitString);
asnWriter.writeByte(0x00);
// XXX: hack to write a raw buffer without a tag -- yuck
asnWriter._ensure(pub.length);
pub.copy(asnWriter._buf, asnWriter._offset, 0, pub.length);
asnWriter._offset += pub.length;
asnWriter.endSequence();
asnWriter.endSequence();
return makePEM('PUBLIC', asnWriter.buffer);
}
function genOpenSSHEdPub(pub) {
var publicKey = Buffer.allocUnsafe(4 + 11 // ssh-ed25519
+ 4 + pub.length);
writeUInt32BE(publicKey, 11, 0);
publicKey.write('ssh-ed25519', 4, 11, 'ascii');
writeUInt32BE(publicKey, pub.length, 15);
pub.copy(publicKey, 19);
return publicKey;
}
function genOpenSSLEdPriv(priv) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
// version
asnWriter.writeInt(0x00, Ber.Integer);
// algorithm
asnWriter.startSequence();
asnWriter.writeOID('1.3.101.112'); // id-Ed25519
asnWriter.endSequence();
// PrivateKey
asnWriter.startSequence(Ber.OctetString);
asnWriter.writeBuffer(priv, Ber.OctetString);
asnWriter.endSequence();
asnWriter.endSequence();
return makePEM('PRIVATE', asnWriter.buffer);
}
function genOpenSSLECDSAPub(oid, Q) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
// algorithm
asnWriter.startSequence();
asnWriter.writeOID('1.2.840.10045.2.1'); // id-ecPublicKey
// algorithm parameters (namedCurve)
asnWriter.writeOID(oid);
asnWriter.endSequence();
// subjectPublicKey
asnWriter.startSequence(Ber.BitString);
asnWriter.writeByte(0x00);
// XXX: hack to write a raw buffer without a tag -- yuck
asnWriter._ensure(Q.length);
Q.copy(asnWriter._buf, asnWriter._offset, 0, Q.length);
asnWriter._offset += Q.length;
// end hack
asnWriter.endSequence();
asnWriter.endSequence();
return makePEM('PUBLIC', asnWriter.buffer);
}
function genOpenSSHECDSAPub(oid, Q) {
var curveName;
switch (oid) {
case '1.2.840.10045.3.1.7':
// prime256v1/secp256r1
curveName = 'nistp256';
break;
case '1.3.132.0.34':
// secp384r1
curveName = 'nistp384';
break;
case '1.3.132.0.35':
// secp521r1
curveName = 'nistp521';
break;
default:
return;
}
var publicKey = Buffer.allocUnsafe(4 + 19 // ecdsa-sha2-<curve name>
+ 4 + 8 // <curve name>
+ 4 + Q.length);
writeUInt32BE(publicKey, 19, 0);
publicKey.write('ecdsa-sha2-' + curveName, 4, 19, 'ascii');
writeUInt32BE(publicKey, 8, 23);
publicKey.write(curveName, 27, 8, 'ascii');
writeUInt32BE(publicKey, Q.length, 35);
Q.copy(publicKey, 39);
return publicKey;
}
function genOpenSSLECDSAPriv(oid, pub, priv) {
var asnWriter = new Ber.Writer();
asnWriter.startSequence();
// version
asnWriter.writeInt(0x01, Ber.Integer);
// privateKey
asnWriter.writeBuffer(priv, Ber.OctetString);
// parameters (optional)
asnWriter.startSequence(0xA0);
asnWriter.writeOID(oid);
asnWriter.endSequence();
// publicKey (optional)
asnWriter.startSequence(0xA1);
asnWriter.startSequence(Ber.BitString);
asnWriter.writeByte(0x00);
// XXX: hack to write a raw buffer without a tag -- yuck
asnWriter._ensure(pub.length);
pub.copy(asnWriter._buf, asnWriter._offset, 0, pub.length);
asnWriter._offset += pub.length;
// end hack
asnWriter.endSequence();
asnWriter.endSequence();
asnWriter.endSequence();
return makePEM('EC PRIVATE', asnWriter.buffer);
}
function genOpenSSLECDSAPubFromPriv(curveName, priv) {
var tempECDH = crypto.createECDH(curveName);
tempECDH.setPrivateKey(priv);
return tempECDH.getPublicKey();
}
var baseKeySign = (function() {
if (typeof cryptoSign === 'function') {
return function sign(data) {
var pem = this[SYM_PRIV_PEM];
if (pem === null)
return new Error('No private key available');
try {
return cryptoSign(this[SYM_HASH_ALGO], data, pem);
} catch (ex) {
return ex;
}
};
} else {
function trySign(signature, privKey) {
try {
return signature.sign(privKey);
} catch (ex) {
return ex;
}
}
return function sign(data) {
var pem = this[SYM_PRIV_PEM];
if (pem === null)
return new Error('No private key available');
var signature = createSign(this[SYM_HASH_ALGO]);
signature.update(data);
return trySign(signature, pem);
};
}
})();
var baseKeyVerify = (function() {
if (typeof cryptoVerify === 'function') {
return function verify(data, signature) {
var pem = this[SYM_PUB_PEM];
if (pem === null)
return new Error('No public key available');
try {
return cryptoVerify(this[SYM_HASH_ALGO], data, pem, signature);
} catch (ex) {
return ex;
}
};
} else {
function tryVerify(verifier, pubKey, signature) {
try {
return verifier.verify(pubKey, signature);
} catch (ex) {
return ex;
}
}
return function verify(data, signature) {
var pem = this[SYM_PUB_PEM];
if (pem === null)
return new Error('No public key available');
var verifier = createVerify(this[SYM_HASH_ALGO]);
verifier.update(data);
return tryVerify(verifier, pem, signature);
};
}
})();
var BaseKey = {
sign: baseKeySign,
verify: baseKeyVerify,
getPrivatePEM: function getPrivatePEM() {
return this[SYM_PRIV_PEM];
},
getPublicPEM: function getPublicPEM() {
return this[SYM_PUB_PEM];
},
getPublicSSH: function getPublicSSH() {
return this[SYM_PUB_SSH];
},
};
function OpenSSH_Private(type, comment, privPEM, pubPEM, pubSSH, algo, decrypted) {
this.type = type;
this.comment = comment;
this[SYM_PRIV_PEM] = privPEM;
this[SYM_PUB_PEM] = pubPEM;
this[SYM_PUB_SSH] = pubSSH;
this[SYM_HASH_ALGO] = algo;
this[SYM_DECRYPTED] = decrypted;
}
OpenSSH_Private.prototype = BaseKey;
(function() {
var regexp = /^-----BEGIN OPENSSH PRIVATE KEY-----(?:\r\n|\n)([\s\S]+)(?:\r\n|\n)-----END OPENSSH PRIVATE KEY-----$/;
OpenSSH_Private.parse = function(str, passphrase) {
var m = regexp.exec(str);
if (m === null)
return null;
var ret;
var data = Buffer.from(m[1], 'base64');
if (data.length < 31) // magic (+ magic null term.) + minimum field lengths
return new Error('Malformed OpenSSH private key');
var magic = data.toString('ascii', 0, 15);
if (magic !== 'openssh-key-v1\0')
return new Error('Unsupported OpenSSH key magic: ' + magic);
// avoid cyclic require by requiring on first use
if (!utils)
utils = require('./utils');
var cipherName = utils.readString(data, 15, 'ascii');
if (cipherName === false)
return new Error('Malformed OpenSSH private key');
if (cipherName !== 'none' && SUPPORTED_CIPHER.indexOf(cipherName) === -1)
return new Error('Unsupported cipher for OpenSSH key: ' + cipherName);
var kdfName = utils.readString(data, data._pos, 'ascii');
if (kdfName === false)
return new Error('Malformed OpenSSH private key');
if (kdfName !== 'none') {
if (cipherName === 'none')
return new Error('Malformed OpenSSH private key');
if (kdfName !== 'bcrypt')
return new Error('Unsupported kdf name for OpenSSH key: ' + kdfName);
if (!passphrase) {
return new Error(
'Encrypted private OpenSSH key detected, but no passphrase given'
);
}
} else if (cipherName !== 'none') {
return new Error('Malformed OpenSSH private key');
}
var encInfo;
var cipherKey;
var cipherIV;
if (cipherName !== 'none')
encInfo = CIPHER_INFO[cipherName];
var kdfOptions = utils.readString(data, data._pos);
if (kdfOptions === false)
return new Error('Malformed OpenSSH private key');
if (kdfOptions.length) {
switch (kdfName) {
case 'none':
return new Error('Malformed OpenSSH private key');
case 'bcrypt':
/*
string salt
uint32 rounds
*/
var salt = utils.readString(kdfOptions, 0);
if (salt === false || kdfOptions._pos + 4 > kdfOptions.length)
return new Error('Malformed OpenSSH private key');
var rounds = readUInt32BE(kdfOptions, kdfOptions._pos);
var gen = Buffer.allocUnsafe(encInfo.keyLen + encInfo.ivLen);
var r = bcrypt_pbkdf(passphrase,
passphrase.length,
salt,
salt.length,
gen,
gen.length,
rounds);
if (r !== 0)
return new Error('Failed to generate information to decrypt key');
cipherKey = gen.slice(0, encInfo.keyLen);
cipherIV = gen.slice(encInfo.keyLen);
break;
}
} else if (kdfName !== 'none') {
return new Error('Malformed OpenSSH private key');
}
var keyCount = utils.readInt(data, data._pos);
if (keyCount === false)
return new Error('Malformed OpenSSH private key');
data._pos += 4;
if (keyCount > 0) {
// TODO: place sensible limit on max `keyCount`
// Read public keys first
for (var i = 0; i < keyCount; ++i) {
var pubData = utils.readString(data, data._pos);
if (pubData === false)
return new Error('Malformed OpenSSH private key');
var type = utils.readString(pubData, 0, 'ascii');
if (type === false)
return new Error('Malformed OpenSSH private key');
}
var privBlob = utils.readString(data, data._pos);
if (privBlob === false)
return new Error('Malformed OpenSSH private key');
if (cipherKey !== undefined) {
// encrypted private key(s)
if (privBlob.length < encInfo.blockLen
|| (privBlob.length % encInfo.blockLen) !== 0) {
return new Error('Malformed OpenSSH private key');
}
try {
var options = { authTagLength: encInfo.authLen };
var decipher = createDecipheriv(SSH_TO_OPENSSL[cipherName],
cipherKey,
cipherIV,
options);
if (encInfo.authLen > 0) {
if (data.length - data._pos < encInfo.authLen)
return new Error('Malformed OpenSSH private key');
decipher.setAuthTag(
data.slice(data._pos, data._pos += encInfo.authLen)
);
}
privBlob = combineBuffers(decipher.update(privBlob),
decipher.final());
} catch (ex) {
return ex;
}
}
// Nothing should we follow the private key(s), except a possible
// authentication tag for relevant ciphers
if (data._pos !== data.length)
return new Error('Malformed OpenSSH private key');
ret = parseOpenSSHPrivKeys(privBlob, keyCount, cipherKey !== undefined);
} else {
ret = [];
}
return ret;
};
function parseOpenSSHPrivKeys(data, nkeys, decrypted) {
var keys = [];
/*
uint32 checkint
uint32 checkint
string privatekey1
string comment1
string privatekey2
string comment2
...
string privatekeyN
string commentN
char 1
char 2
char 3
...
char padlen % 255
*/
if (data.length < 8)
return new Error('Malformed OpenSSH private key');
var check1 = readUInt32BE(data, 0);
var check2 = readUInt32BE(data, 4);
if (check1 !== check2) {
if (decrypted)
return new Error('OpenSSH key integrity check failed -- bad passphrase?');
return new Error('OpenSSH key integrity check failed');
}
data._pos = 8;
var i;
var oid;
for (i = 0; i < nkeys; ++i) {
var algo = undefined;
var privPEM = undefined;
var pubPEM = undefined;
var pubSSH = undefined;
// The OpenSSH documentation for the key format actually lies, the entirety
// of the private key content is not contained with a string field, it's
// actually the literal contents of the private key, so to be able to find
// the end of the key data you need to know the layout/format of each key
// type ...
var type = utils.readString(data, data._pos, 'ascii');
if (type === false)
return new Error('Malformed OpenSSH private key');
switch (type) {
case 'ssh-rsa':
/*
string n -- public
string e -- public
string d -- private
string iqmp -- private
string p -- private
string q -- private
*/
var n = utils.readString(data, data._pos);
if (n === false)
return new Error('Malformed OpenSSH private key');
var e = utils.readString(data, data._pos);
if (e === false)
return new Error('Malformed OpenSSH private key');
var d = utils.readString(data, data._pos);
if (d === false)
return new Error('Malformed OpenSSH private key');
var iqmp = utils.readString(data, data._pos);
if (iqmp === false)
return new Error('Malformed OpenSSH private key');
var p = utils.readString(data, data._pos);
if (p === false)
return new Error('Malformed OpenSSH private key');
var q = utils.readString(data, data._pos);
if (q === false)
return new Error('Malformed OpenSSH private key');
pubPEM = genOpenSSLRSAPub(n, e);
pubSSH = genOpenSSHRSAPub(n, e);
privPEM = genOpenSSLRSAPriv(n, e, d, iqmp, p, q);
algo = 'sha1';
break;
case 'ssh-dss':
/*
string p -- public
string q -- public
string g -- public
string y -- public
string x -- private
*/
var p = utils.readString(data, data._pos);
if (p === false)
return new Error('Malformed OpenSSH private key');
var q = utils.readString(data, data._pos);
if (q === false)
return new Error('Malformed OpenSSH private key');
var g = utils.readString(data, data._pos);
if (g === false)
return new Error('Malformed OpenSSH private key');
var y = utils.readString(data, data._pos);
if (y === false)
return new Error('Malformed OpenSSH private key');
var x = utils.readString(data, data._pos);
if (x === false)
return new Error('Malformed OpenSSH private key');
pubPEM = genOpenSSLDSAPub(p, q, g, y);
pubSSH = genOpenSSHDSAPub(p, q, g, y);
privPEM = genOpenSSLDSAPriv(p, q, g, y, x);
algo = 'sha1';
break;
case 'ssh-ed25519':
if (!EDDSA_SUPPORTED)
return new Error('Unsupported OpenSSH private key type: ' + type);
/*
* string public key
* string private key + public key
*/
var edpub = utils.readString(data, data._pos);
if (edpub === false || edpub.length !== 32)
return new Error('Malformed OpenSSH private key');
var edpriv = utils.readString(data, data._pos);
if (edpriv === false || edpriv.length !== 64)
return new Error('Malformed OpenSSH private key');
pubPEM = genOpenSSLEdPub(edpub);
pubSSH = genOpenSSHEdPub(edpub);
privPEM = genOpenSSLEdPriv(edpriv.slice(0, 32));
algo = null;
break;
case 'ecdsa-sha2-nistp256':
algo = 'sha256';
oid = '1.2.840.10045.3.1.7';
case 'ecdsa-sha2-nistp384':
if (algo === undefined) {
algo = 'sha384';
oid = '1.3.132.0.34';
}
case 'ecdsa-sha2-nistp521':
if (algo === undefined) {
algo = 'sha512';
oid = '1.3.132.0.35';
}
/*
string curve name
string Q -- public
string d -- private
*/
// TODO: validate curve name against type
if (!skipFields(data, 1)) // Skip curve name
return new Error('Malformed OpenSSH private key');
var ecpub = utils.readString(data, data._pos);
if (ecpub === false)
return new Error('Malformed OpenSSH private key');
var ecpriv = utils.readString(data, data._pos);
if (ecpriv === false)
return new Error('Malformed OpenSSH private key');
pubPEM = genOpenSSLECDSAPub(oid, ecpub);
pubSSH = genOpenSSHECDSAPub(oid, ecpub);
privPEM = genOpenSSLECDSAPriv(oid, ecpub, ecpriv);
break;
default:
return new Error('Unsupported OpenSSH private key type: ' + type);
}
var privComment = utils.readString(data, data._pos, 'utf8');
if (privComment === false)
return new Error('Malformed OpenSSH private key');
keys.push(
new OpenSSH_Private(type, privComment, privPEM, pubPEM, pubSSH, algo,
decrypted)
);
}
var cnt = 0;
for (i = data._pos; i < data.length; ++i) {
if (data[i] !== (++cnt % 255))
return new Error('Malformed OpenSSH private key');
}
return keys;
}
})();
function OpenSSH_Old_Private(type, comment, privPEM, pubPEM, pubSSH, algo, decrypted) {
this.type = type;
this.comment = comment;
this[SYM_PRIV_PEM] = privPEM;
this[SYM_PUB_PEM] = pubPEM;
this[SYM_PUB_SSH] = pubSSH;
this[SYM_HASH_ALGO] = algo;
this[SYM_DECRYPTED] = decrypted;
}
OpenSSH_Old_Private.prototype = BaseKey;
(function() {
var regexp = /^-----BEGIN (RSA|DSA|EC) PRIVATE KEY-----(?:\r\n|\n)((?:[^:]+:\s*[\S].*(?:\r\n|\n))*)([\s\S]+)(?:\r\n|\n)-----END (RSA|DSA|EC) PRIVATE KEY-----$/;
OpenSSH_Old_Private.parse = function(str, passphrase) {
var m = regexp.exec(str);
if (m === null)
return null;
var privBlob = Buffer.from(m[3], 'base64');
var headers = m[2];
var decrypted = false;
if (headers !== undefined) {
// encrypted key
headers = headers.split(/\r\n|\n/g);
for (var i = 0; i < headers.length; ++i) {
var header = headers[i];
var sepIdx = header.indexOf(':');
if (header.slice(0, sepIdx) === 'DEK-Info') {
var val = header.slice(sepIdx + 2);
sepIdx = val.indexOf(',');
if (sepIdx === -1)
continue;
var cipherName = val.slice(0, sepIdx).toLowerCase();
if (supportedOpenSSLCiphers.indexOf(cipherName) === -1) {
return new Error(
'Cipher ('
+ cipherName
+ ') not supported for encrypted OpenSSH private key'
);
}
var encInfo = CIPHER_INFO_OPENSSL[cipherName];
if (!encInfo) {
return new Error(
'Cipher ('
+ cipherName
+ ') not supported for encrypted OpenSSH private key'
);
}
var cipherIV = Buffer.from(val.slice(sepIdx + 1), 'hex');
if (cipherIV.length !== encInfo.ivLen)
return new Error('Malformed encrypted OpenSSH private key');
if (!passphrase) {
return new Error(
'Encrypted OpenSSH private key detected, but no passphrase given'
);
}
var cipherKey = createHash('md5')
.update(passphrase)
.update(cipherIV.slice(0, 8))
.digest();
while (cipherKey.length < encInfo.keyLen) {
cipherKey = combineBuffers(
cipherKey,
(createHash('md5')
.update(cipherKey)
.update(passphrase)
.update(cipherIV)
.digest()).slice(0, 8)
);
}
if (cipherKey.length > encInfo.keyLen)
cipherKey = cipherKey.slice(0, encInfo.keyLen);
try {
var decipher = createDecipheriv(cipherName, cipherKey, cipherIV);
decipher.setAutoPadding(false);
privBlob = combineBuffers(decipher.update(privBlob),
decipher.final());
decrypted = true;
} catch (ex) {
return ex;
}
}
}
}
var type;
var privPEM;
var pubPEM;
var pubSSH;
var algo;
var reader;
var errMsg = 'Malformed OpenSSH private key';
if (decrypted)
errMsg += '. Bad passphrase?';
switch (m[1]) {
case 'RSA':
type = 'ssh-rsa';
privPEM = makePEM('RSA PRIVATE', privBlob);
try {
reader = new Ber.Reader(privBlob);
reader.readSequence();
reader.readInt(); // skip version
var n = reader.readString(Ber.Integer, true);
if (n === null)
return new Error(errMsg);
var e = reader.readString(Ber.Integer, true);
if (e === null)
return new Error(errMsg);
pubPEM = genOpenSSLRSAPub(n, e);
pubSSH = genOpenSSHRSAPub(n, e);
} catch (ex) {
return new Error(errMsg);
}
algo = 'sha1';
break;
case 'DSA':
type = 'ssh-dss';
privPEM = makePEM('DSA PRIVATE', privBlob);
try {
reader = new Ber.Reader(privBlob);
reader.readSequence();
reader.readInt(); // skip version
var p = reader.readString(Ber.Integer, true);
if (p === null)
return new Error(errMsg);
var q = reader.readString(Ber.Integer, true);
if (q === null)
return new Error(errMsg);
var g = reader.readString(Ber.Integer, true);
if (g === null)
return new Error(errMsg);
var y = reader.readString(Ber.Integer, true);
if (y === null)
return new Error(errMsg);
pubPEM = genOpenSSLDSAPub(p, q, g, y);
pubSSH = genOpenSSHDSAPub(p, q, g, y);
} catch (ex) {
return new Error(errMsg);
}
algo = 'sha1';
break;
case 'EC':
var ecSSLName;
var ecPriv;
try {
reader = new Ber.Reader(privBlob);
reader.readSequence();
reader.readInt(); // skip version
ecPriv = reader.readString(Ber.OctetString, true);
reader.readByte(); // Skip "complex" context type byte
var offset = reader.readLength(); // Skip context length
if (offset !== null) {
reader._offset = offset;
var oid = reader.readOID();
if (oid === null)
return new Error(errMsg);
switch (oid) {
case '1.2.840.10045.3.1.7':
// prime256v1/secp256r1
ecSSLName = 'prime256v1';
type = 'ecdsa-sha2-nistp256';
algo = 'sha256';
break;
case '1.3.132.0.34':
// secp384r1
ecSSLName = 'secp384r1';
type = 'ecdsa-sha2-nistp384';
algo = 'sha384';
break;
case '1.3.132.0.35':
// secp521r1
ecSSLName = 'secp521r1';
type = 'ecdsa-sha2-nistp521';
algo = 'sha512';