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Mini Shell
// Copyright 2015 Joyent, Inc.
module.exports = {
read: read,
readPkcs8: readPkcs8,
write: write,
writePkcs8: writePkcs8,
readECDSACurve: readECDSACurve,
writeECDSACurve: writeECDSACurve
};
var assert = require('assert-plus');
var asn1 = require('asn1');
var Buffer = require('safer-buffer').Buffer;
var algs = require('../algs');
var utils = require('../utils');
var Key = require('../key');
var PrivateKey = require('../private-key');
var pem = require('./pem');
function read(buf, options) {
return (pem.read(buf, options, 'pkcs8'));
}
function write(key, options) {
return (pem.write(key, options, 'pkcs8'));
}
/* Helper to read in a single mpint */
function readMPInt(der, nm) {
assert.strictEqual(der.peek(), asn1.Ber.Integer,
nm + ' is not an Integer');
return (utils.mpNormalize(der.readString(asn1.Ber.Integer, true)));
}
function readPkcs8(alg, type, der) {
/* Private keys in pkcs#8 format have a weird extra int */
if (der.peek() === asn1.Ber.Integer) {
assert.strictEqual(type, 'private',
'unexpected Integer at start of public key');
der.readString(asn1.Ber.Integer, true);
}
der.readSequence();
var next = der.offset + der.length;
var oid = der.readOID();
switch (oid) {
case '1.2.840.113549.1.1.1':
der._offset = next;
if (type === 'public')
return (readPkcs8RSAPublic(der));
else
return (readPkcs8RSAPrivate(der));
case '1.2.840.10040.4.1':
if (type === 'public')
return (readPkcs8DSAPublic(der));
else
return (readPkcs8DSAPrivate(der));
case '1.2.840.10045.2.1':
if (type === 'public')
return (readPkcs8ECDSAPublic(der));
else
return (readPkcs8ECDSAPrivate(der));
case '1.3.101.112':
if (type === 'public') {
return (readPkcs8EdDSAPublic(der));
} else {
return (readPkcs8EdDSAPrivate(der));
}
case '1.3.101.110':
if (type === 'public') {
return (readPkcs8X25519Public(der));
} else {
return (readPkcs8X25519Private(der));
}
default:
throw (new Error('Unknown key type OID ' + oid));
}
}
function readPkcs8RSAPublic(der) {
// bit string sequence
der.readSequence(asn1.Ber.BitString);
der.readByte();
der.readSequence();
// modulus
var n = readMPInt(der, 'modulus');
var e = readMPInt(der, 'exponent');
// now, make the key
var key = {
type: 'rsa',
source: der.originalInput,
parts: [
{ name: 'e', data: e },
{ name: 'n', data: n }
]
};
return (new Key(key));
}
function readPkcs8RSAPrivate(der) {
der.readSequence(asn1.Ber.OctetString);
der.readSequence();
var ver = readMPInt(der, 'version');
assert.equal(ver[0], 0x0, 'unknown RSA private key version');
// modulus then public exponent
var n = readMPInt(der, 'modulus');
var e = readMPInt(der, 'public exponent');
var d = readMPInt(der, 'private exponent');
var p = readMPInt(der, 'prime1');
var q = readMPInt(der, 'prime2');
var dmodp = readMPInt(der, 'exponent1');
var dmodq = readMPInt(der, 'exponent2');
var iqmp = readMPInt(der, 'iqmp');
// now, make the key
var key = {
type: 'rsa',
parts: [
{ name: 'n', data: n },
{ name: 'e', data: e },
{ name: 'd', data: d },
{ name: 'iqmp', data: iqmp },
{ name: 'p', data: p },
{ name: 'q', data: q },
{ name: 'dmodp', data: dmodp },
{ name: 'dmodq', data: dmodq }
]
};
return (new PrivateKey(key));
}
function readPkcs8DSAPublic(der) {
der.readSequence();
var p = readMPInt(der, 'p');
var q = readMPInt(der, 'q');
var g = readMPInt(der, 'g');
// bit string sequence
der.readSequence(asn1.Ber.BitString);
der.readByte();
var y = readMPInt(der, 'y');
// now, make the key
var key = {
type: 'dsa',
parts: [
{ name: 'p', data: p },
{ name: 'q', data: q },
{ name: 'g', data: g },
{ name: 'y', data: y }
]
};
return (new Key(key));
}
function readPkcs8DSAPrivate(der) {
der.readSequence();
var p = readMPInt(der, 'p');
var q = readMPInt(der, 'q');
var g = readMPInt(der, 'g');
der.readSequence(asn1.Ber.OctetString);
var x = readMPInt(der, 'x');
/* The pkcs#8 format does not include the public key */
var y = utils.calculateDSAPublic(g, p, x);
var key = {
type: 'dsa',
parts: [
{ name: 'p', data: p },
{ name: 'q', data: q },
{ name: 'g', data: g },
{ name: 'y', data: y },
{ name: 'x', data: x }
]
};
return (new PrivateKey(key));
}
function readECDSACurve(der) {
var curveName, curveNames;
var j, c, cd;
if (der.peek() === asn1.Ber.OID) {
var oid = der.readOID();
curveNames = Object.keys(algs.curves);
for (j = 0; j < curveNames.length; ++j) {
c = curveNames[j];
cd = algs.curves[c];
if (cd.pkcs8oid === oid) {
curveName = c;
break;
}
}
} else {
// ECParameters sequence
der.readSequence();
var version = der.readString(asn1.Ber.Integer, true);
assert.strictEqual(version[0], 1, 'ECDSA key not version 1');
var curve = {};
// FieldID sequence
der.readSequence();
var fieldTypeOid = der.readOID();
assert.strictEqual(fieldTypeOid, '1.2.840.10045.1.1',
'ECDSA key is not from a prime-field');
var p = curve.p = utils.mpNormalize(
der.readString(asn1.Ber.Integer, true));
/*
* p always starts with a 1 bit, so count the zeros to get its
* real size.
*/
curve.size = p.length * 8 - utils.countZeros(p);
// Curve sequence
der.readSequence();
curve.a = utils.mpNormalize(
der.readString(asn1.Ber.OctetString, true));
curve.b = utils.mpNormalize(
der.readString(asn1.Ber.OctetString, true));
if (der.peek() === asn1.Ber.BitString)
curve.s = der.readString(asn1.Ber.BitString, true);
// Combined Gx and Gy
curve.G = der.readString(asn1.Ber.OctetString, true);
assert.strictEqual(curve.G[0], 0x4,
'uncompressed G is required');
curve.n = utils.mpNormalize(
der.readString(asn1.Ber.Integer, true));
curve.h = utils.mpNormalize(
der.readString(asn1.Ber.Integer, true));
assert.strictEqual(curve.h[0], 0x1, 'a cofactor=1 curve is ' +
'required');
curveNames = Object.keys(algs.curves);
var ks = Object.keys(curve);
for (j = 0; j < curveNames.length; ++j) {
c = curveNames[j];
cd = algs.curves[c];
var equal = true;
for (var i = 0; i < ks.length; ++i) {
var k = ks[i];
if (cd[k] === undefined)
continue;
if (typeof (cd[k]) === 'object' &&
cd[k].equals !== undefined) {
if (!cd[k].equals(curve[k])) {
equal = false;
break;
}
} else if (Buffer.isBuffer(cd[k])) {
if (cd[k].toString('binary')
!== curve[k].toString('binary')) {
equal = false;
break;
}
} else {
if (cd[k] !== curve[k]) {
equal = false;
break;
}
}
}
if (equal) {
curveName = c;
break;
}
}
}
return (curveName);
}
function readPkcs8ECDSAPrivate(der) {
var curveName = readECDSACurve(der);
assert.string(curveName, 'a known elliptic curve');
der.readSequence(asn1.Ber.OctetString);
der.readSequence();
var version = readMPInt(der, 'version');
assert.equal(version[0], 1, 'unknown version of ECDSA key');
var d = der.readString(asn1.Ber.OctetString, true);
der.readSequence(0xa1);
var Q = der.readString(asn1.Ber.BitString, true);
Q = utils.ecNormalize(Q);
var key = {
type: 'ecdsa',
parts: [
{ name: 'curve', data: Buffer.from(curveName) },
{ name: 'Q', data: Q },
{ name: 'd', data: d }
]
};
return (new PrivateKey(key));
}
function readPkcs8ECDSAPublic(der) {
var curveName = readECDSACurve(der);
assert.string(curveName, 'a known elliptic curve');
var Q = der.readString(asn1.Ber.BitString, true);
Q = utils.ecNormalize(Q);
var key = {
type: 'ecdsa',
parts: [
{ name: 'curve', data: Buffer.from(curveName) },
{ name: 'Q', data: Q }
]
};
return (new Key(key));
}
function readPkcs8EdDSAPublic(der) {
if (der.peek() === 0x00)
der.readByte();
var A = utils.readBitString(der);
var key = {
type: 'ed25519',
parts: [
{ name: 'A', data: utils.zeroPadToLength(A, 32) }
]
};
return (new Key(key));
}
function readPkcs8X25519Public(der) {
var A = utils.readBitString(der);
var key = {
type: 'curve25519',
parts: [
{ name: 'A', data: utils.zeroPadToLength(A, 32) }
]
};
return (new Key(key));
}
function readPkcs8EdDSAPrivate(der) {
if (der.peek() === 0x00)
der.readByte();
der.readSequence(asn1.Ber.OctetString);
var k = der.readString(asn1.Ber.OctetString, true);
k = utils.zeroPadToLength(k, 32);
var A;
if (der.peek() === asn1.Ber.BitString) {
A = utils.readBitString(der);
A = utils.zeroPadToLength(A, 32);
} else {
A = utils.calculateED25519Public(k);
}
var key = {
type: 'ed25519',
parts: [
{ name: 'A', data: utils.zeroPadToLength(A, 32) },
{ name: 'k', data: utils.zeroPadToLength(k, 32) }
]
};
return (new PrivateKey(key));
}
function readPkcs8X25519Private(der) {
if (der.peek() === 0x00)
der.readByte();
der.readSequence(asn1.Ber.OctetString);
var k = der.readString(asn1.Ber.OctetString, true);
k = utils.zeroPadToLength(k, 32);
var A = utils.calculateX25519Public(k);
var key = {
type: 'curve25519',
parts: [
{ name: 'A', data: utils.zeroPadToLength(A, 32) },
{ name: 'k', data: utils.zeroPadToLength(k, 32) }
]
};
return (new PrivateKey(key));
}
function writePkcs8(der, key) {
der.startSequence();
if (PrivateKey.isPrivateKey(key)) {
var sillyInt = Buffer.from([0]);
der.writeBuffer(sillyInt, asn1.Ber.Integer);
}
der.startSequence();
switch (key.type) {
case 'rsa':
der.writeOID('1.2.840.113549.1.1.1');
if (PrivateKey.isPrivateKey(key))
writePkcs8RSAPrivate(key, der);
else
writePkcs8RSAPublic(key, der);
break;
case 'dsa':
der.writeOID('1.2.840.10040.4.1');
if (PrivateKey.isPrivateKey(key))
writePkcs8DSAPrivate(key, der);
else
writePkcs8DSAPublic(key, der);
break;
case 'ecdsa':
der.writeOID('1.2.840.10045.2.1');
if (PrivateKey.isPrivateKey(key))
writePkcs8ECDSAPrivate(key, der);
else
writePkcs8ECDSAPublic(key, der);
break;
case 'ed25519':
der.writeOID('1.3.101.112');
if (PrivateKey.isPrivateKey(key))
throw (new Error('Ed25519 private keys in pkcs8 ' +
'format are not supported'));
writePkcs8EdDSAPublic(key, der);
break;
default:
throw (new Error('Unsupported key type: ' + key.type));
}
der.endSequence();
}
function writePkcs8RSAPrivate(key, der) {
der.writeNull();
der.endSequence();
der.startSequence(asn1.Ber.OctetString);
der.startSequence();
var version = Buffer.from([0]);
der.writeBuffer(version, asn1.Ber.Integer);
der.writeBuffer(key.part.n.data, asn1.Ber.Integer);
der.writeBuffer(key.part.e.data, asn1.Ber.Integer);
der.writeBuffer(key.part.d.data, asn1.Ber.Integer);
der.writeBuffer(key.part.p.data, asn1.Ber.Integer);
der.writeBuffer(key.part.q.data, asn1.Ber.Integer);
if (!key.part.dmodp || !key.part.dmodq)
utils.addRSAMissing(key);
der.writeBuffer(key.part.dmodp.data, asn1.Ber.Integer);
der.writeBuffer(key.part.dmodq.data, asn1.Ber.Integer);
der.writeBuffer(key.part.iqmp.data, asn1.Ber.Integer);
der.endSequence();
der.endSequence();
}
function writePkcs8RSAPublic(key, der) {
der.writeNull();
der.endSequence();
der.startSequence(asn1.Ber.BitString);
der.writeByte(0x00);
der.startSequence();
der.writeBuffer(key.part.n.data, asn1.Ber.Integer);
der.writeBuffer(key.part.e.data, asn1.Ber.Integer);
der.endSequence();
der.endSequence();
}
function writePkcs8DSAPrivate(key, der) {
der.startSequence();
der.writeBuffer(key.part.p.data, asn1.Ber.Integer);
der.writeBuffer(key.part.q.data, asn1.Ber.Integer);
der.writeBuffer(key.part.g.data, asn1.Ber.Integer);
der.endSequence();
der.endSequence();
der.startSequence(asn1.Ber.OctetString);
der.writeBuffer(key.part.x.data, asn1.Ber.Integer);
der.endSequence();
}
function writePkcs8DSAPublic(key, der) {
der.startSequence();
der.writeBuffer(key.part.p.data, asn1.Ber.Integer);
der.writeBuffer(key.part.q.data, asn1.Ber.Integer);
der.writeBuffer(key.part.g.data, asn1.Ber.Integer);
der.endSequence();
der.endSequence();
der.startSequence(asn1.Ber.BitString);
der.writeByte(0x00);
der.writeBuffer(key.part.y.data, asn1.Ber.Integer);
der.endSequence();
}
function writeECDSACurve(key, der) {
var curve = algs.curves[key.curve];
if (curve.pkcs8oid) {
/* This one has a name in pkcs#8, so just write the oid */
der.writeOID(curve.pkcs8oid);
} else {
// ECParameters sequence
der.startSequence();
var version = Buffer.from([1]);
der.writeBuffer(version, asn1.Ber.Integer);
// FieldID sequence
der.startSequence();
der.writeOID('1.2.840.10045.1.1'); // prime-field
der.writeBuffer(curve.p, asn1.Ber.Integer);
der.endSequence();
// Curve sequence
der.startSequence();
var a = curve.p;
if (a[0] === 0x0)
a = a.slice(1);
der.writeBuffer(a, asn1.Ber.OctetString);
der.writeBuffer(curve.b, asn1.Ber.OctetString);
der.writeBuffer(curve.s, asn1.Ber.BitString);
der.endSequence();
der.writeBuffer(curve.G, asn1.Ber.OctetString);
der.writeBuffer(curve.n, asn1.Ber.Integer);
var h = curve.h;
if (!h) {
h = Buffer.from([1]);
}
der.writeBuffer(h, asn1.Ber.Integer);
// ECParameters
der.endSequence();
}
}
function writePkcs8ECDSAPublic(key, der) {
writeECDSACurve(key, der);
der.endSequence();
var Q = utils.ecNormalize(key.part.Q.data, true);
der.writeBuffer(Q, asn1.Ber.BitString);
}
function writePkcs8ECDSAPrivate(key, der) {
writeECDSACurve(key, der);
der.endSequence();
der.startSequence(asn1.Ber.OctetString);
der.startSequence();
var version = Buffer.from([1]);
der.writeBuffer(version, asn1.Ber.Integer);
der.writeBuffer(key.part.d.data, asn1.Ber.OctetString);
der.startSequence(0xa1);
var Q = utils.ecNormalize(key.part.Q.data, true);
der.writeBuffer(Q, asn1.Ber.BitString);
der.endSequence();
der.endSequence();
der.endSequence();
}
function writePkcs8EdDSAPublic(key, der) {
der.endSequence();
utils.writeBitString(der, key.part.A.data);
}
function writePkcs8EdDSAPrivate(key, der) {
der.endSequence();
var k = utils.mpNormalize(key.part.k.data, true);
der.startSequence(asn1.Ber.OctetString);
der.writeBuffer(k, asn1.Ber.OctetString);
der.endSequence();
}
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