// Copyright 2015 Joyent, Inc.
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module.exports = {
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bufferSplit: bufferSplit,
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addRSAMissing: addRSAMissing,
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calculateDSAPublic: calculateDSAPublic,
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calculateED25519Public: calculateED25519Public,
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calculateX25519Public: calculateX25519Public,
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mpNormalize: mpNormalize,
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mpDenormalize: mpDenormalize,
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ecNormalize: ecNormalize,
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countZeros: countZeros,
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assertCompatible: assertCompatible,
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isCompatible: isCompatible,
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opensslKeyDeriv: opensslKeyDeriv,
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opensshCipherInfo: opensshCipherInfo,
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publicFromPrivateECDSA: publicFromPrivateECDSA,
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zeroPadToLength: zeroPadToLength,
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writeBitString: writeBitString,
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readBitString: readBitString,
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pbkdf2: pbkdf2
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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 PrivateKey = require('./private-key');
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var Key = require('./key');
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var crypto = require('crypto');
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var algs = require('./algs');
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var asn1 = require('asn1');
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var ec = require('ecc-jsbn/lib/ec');
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var jsbn = require('jsbn').BigInteger;
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var nacl = require('tweetnacl');
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var MAX_CLASS_DEPTH = 3;
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function isCompatible(obj, klass, needVer) {
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if (obj === null || typeof (obj) !== 'object')
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return (false);
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if (needVer === undefined)
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needVer = klass.prototype._sshpkApiVersion;
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if (obj instanceof klass &&
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klass.prototype._sshpkApiVersion[0] == needVer[0])
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return (true);
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var proto = Object.getPrototypeOf(obj);
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var depth = 0;
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while (proto.constructor.name !== klass.name) {
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proto = Object.getPrototypeOf(proto);
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if (!proto || ++depth > MAX_CLASS_DEPTH)
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return (false);
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}
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if (proto.constructor.name !== klass.name)
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return (false);
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var ver = proto._sshpkApiVersion;
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if (ver === undefined)
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ver = klass._oldVersionDetect(obj);
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if (ver[0] != needVer[0] || ver[1] < needVer[1])
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return (false);
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return (true);
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}
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function assertCompatible(obj, klass, needVer, name) {
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if (name === undefined)
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name = 'object';
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assert.ok(obj, name + ' must not be null');
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assert.object(obj, name + ' must be an object');
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if (needVer === undefined)
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needVer = klass.prototype._sshpkApiVersion;
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if (obj instanceof klass &&
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klass.prototype._sshpkApiVersion[0] == needVer[0])
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return;
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var proto = Object.getPrototypeOf(obj);
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var depth = 0;
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while (proto.constructor.name !== klass.name) {
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proto = Object.getPrototypeOf(proto);
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assert.ok(proto && ++depth <= MAX_CLASS_DEPTH,
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name + ' must be a ' + klass.name + ' instance');
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}
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assert.strictEqual(proto.constructor.name, klass.name,
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name + ' must be a ' + klass.name + ' instance');
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var ver = proto._sshpkApiVersion;
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if (ver === undefined)
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ver = klass._oldVersionDetect(obj);
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assert.ok(ver[0] == needVer[0] && ver[1] >= needVer[1],
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name + ' must be compatible with ' + klass.name + ' klass ' +
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'version ' + needVer[0] + '.' + needVer[1]);
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}
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var CIPHER_LEN = {
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'des-ede3-cbc': { key: 24, iv: 8 },
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'aes-128-cbc': { key: 16, iv: 16 },
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'aes-256-cbc': { key: 32, iv: 16 }
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};
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var PKCS5_SALT_LEN = 8;
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function opensslKeyDeriv(cipher, salt, passphrase, count) {
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assert.buffer(salt, 'salt');
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assert.buffer(passphrase, 'passphrase');
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assert.number(count, 'iteration count');
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var clen = CIPHER_LEN[cipher];
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assert.object(clen, 'supported cipher');
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salt = salt.slice(0, PKCS5_SALT_LEN);
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var D, D_prev, bufs;
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var material = Buffer.alloc(0);
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while (material.length < clen.key + clen.iv) {
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bufs = [];
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if (D_prev)
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bufs.push(D_prev);
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bufs.push(passphrase);
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bufs.push(salt);
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D = Buffer.concat(bufs);
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for (var j = 0; j < count; ++j)
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D = crypto.createHash('md5').update(D).digest();
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material = Buffer.concat([material, D]);
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D_prev = D;
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}
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return ({
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key: material.slice(0, clen.key),
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iv: material.slice(clen.key, clen.key + clen.iv)
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});
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}
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/* See: RFC2898 */
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function pbkdf2(hashAlg, salt, iterations, size, passphrase) {
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var hkey = Buffer.alloc(salt.length + 4);
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salt.copy(hkey);
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var gen = 0, ts = [];
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var i = 1;
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while (gen < size) {
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var t = T(i++);
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gen += t.length;
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ts.push(t);
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}
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return (Buffer.concat(ts).slice(0, size));
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function T(I) {
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hkey.writeUInt32BE(I, hkey.length - 4);
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var hmac = crypto.createHmac(hashAlg, passphrase);
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hmac.update(hkey);
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var Ti = hmac.digest();
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var Uc = Ti;
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var c = 1;
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while (c++ < iterations) {
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hmac = crypto.createHmac(hashAlg, passphrase);
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hmac.update(Uc);
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Uc = hmac.digest();
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for (var x = 0; x < Ti.length; ++x)
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Ti[x] ^= Uc[x];
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}
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return (Ti);
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}
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}
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/* Count leading zero bits on a buffer */
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function countZeros(buf) {
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var o = 0, obit = 8;
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while (o < buf.length) {
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var mask = (1 << obit);
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if ((buf[o] & mask) === mask)
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break;
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obit--;
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if (obit < 0) {
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o++;
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obit = 8;
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}
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}
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return (o*8 + (8 - obit) - 1);
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}
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function bufferSplit(buf, chr) {
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assert.buffer(buf);
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assert.string(chr);
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var parts = [];
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var lastPart = 0;
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var matches = 0;
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for (var i = 0; i < buf.length; ++i) {
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if (buf[i] === chr.charCodeAt(matches))
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++matches;
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else if (buf[i] === chr.charCodeAt(0))
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matches = 1;
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else
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matches = 0;
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if (matches >= chr.length) {
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var newPart = i + 1;
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parts.push(buf.slice(lastPart, newPart - matches));
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lastPart = newPart;
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matches = 0;
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}
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}
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if (lastPart <= buf.length)
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parts.push(buf.slice(lastPart, buf.length));
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return (parts);
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}
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function ecNormalize(buf, addZero) {
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assert.buffer(buf);
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if (buf[0] === 0x00 && buf[1] === 0x04) {
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if (addZero)
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return (buf);
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return (buf.slice(1));
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} else if (buf[0] === 0x04) {
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if (!addZero)
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return (buf);
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} else {
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while (buf[0] === 0x00)
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buf = buf.slice(1);
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if (buf[0] === 0x02 || buf[0] === 0x03)
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throw (new Error('Compressed elliptic curve points ' +
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'are not supported'));
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if (buf[0] !== 0x04)
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throw (new Error('Not a valid elliptic curve point'));
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if (!addZero)
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return (buf);
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}
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var b = Buffer.alloc(buf.length + 1);
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b[0] = 0x0;
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buf.copy(b, 1);
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return (b);
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}
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function readBitString(der, tag) {
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if (tag === undefined)
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tag = asn1.Ber.BitString;
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var buf = der.readString(tag, true);
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assert.strictEqual(buf[0], 0x00, 'bit strings with unused bits are ' +
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'not supported (0x' + buf[0].toString(16) + ')');
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return (buf.slice(1));
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}
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function writeBitString(der, buf, tag) {
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if (tag === undefined)
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tag = asn1.Ber.BitString;
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var b = Buffer.alloc(buf.length + 1);
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b[0] = 0x00;
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buf.copy(b, 1);
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der.writeBuffer(b, tag);
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}
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function mpNormalize(buf) {
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assert.buffer(buf);
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while (buf.length > 1 && buf[0] === 0x00 && (buf[1] & 0x80) === 0x00)
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buf = buf.slice(1);
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if ((buf[0] & 0x80) === 0x80) {
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var b = Buffer.alloc(buf.length + 1);
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b[0] = 0x00;
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buf.copy(b, 1);
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buf = b;
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}
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return (buf);
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}
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function mpDenormalize(buf) {
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assert.buffer(buf);
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while (buf.length > 1 && buf[0] === 0x00)
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buf = buf.slice(1);
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return (buf);
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}
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function zeroPadToLength(buf, len) {
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assert.buffer(buf);
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assert.number(len);
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while (buf.length > len) {
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assert.equal(buf[0], 0x00);
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buf = buf.slice(1);
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}
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while (buf.length < len) {
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var b = Buffer.alloc(buf.length + 1);
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b[0] = 0x00;
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buf.copy(b, 1);
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buf = b;
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}
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return (buf);
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}
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function bigintToMpBuf(bigint) {
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var buf = Buffer.from(bigint.toByteArray());
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buf = mpNormalize(buf);
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return (buf);
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}
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function calculateDSAPublic(g, p, x) {
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assert.buffer(g);
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assert.buffer(p);
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assert.buffer(x);
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g = new jsbn(g);
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p = new jsbn(p);
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x = new jsbn(x);
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var y = g.modPow(x, p);
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var ybuf = bigintToMpBuf(y);
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return (ybuf);
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}
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function calculateED25519Public(k) {
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assert.buffer(k);
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var kp = nacl.sign.keyPair.fromSeed(new Uint8Array(k));
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return (Buffer.from(kp.publicKey));
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}
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function calculateX25519Public(k) {
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assert.buffer(k);
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var kp = nacl.box.keyPair.fromSeed(new Uint8Array(k));
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return (Buffer.from(kp.publicKey));
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}
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function addRSAMissing(key) {
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assert.object(key);
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assertCompatible(key, PrivateKey, [1, 1]);
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var d = new jsbn(key.part.d.data);
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var buf;
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if (!key.part.dmodp) {
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var p = new jsbn(key.part.p.data);
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var dmodp = d.mod(p.subtract(1));
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buf = bigintToMpBuf(dmodp);
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key.part.dmodp = {name: 'dmodp', data: buf};
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key.parts.push(key.part.dmodp);
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}
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if (!key.part.dmodq) {
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var q = new jsbn(key.part.q.data);
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var dmodq = d.mod(q.subtract(1));
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buf = bigintToMpBuf(dmodq);
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key.part.dmodq = {name: 'dmodq', data: buf};
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key.parts.push(key.part.dmodq);
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}
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}
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function publicFromPrivateECDSA(curveName, priv) {
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assert.string(curveName, 'curveName');
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assert.buffer(priv);
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var params = algs.curves[curveName];
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var p = new jsbn(params.p);
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var a = new jsbn(params.a);
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var b = new jsbn(params.b);
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var curve = new ec.ECCurveFp(p, a, b);
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var G = curve.decodePointHex(params.G.toString('hex'));
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var d = new jsbn(mpNormalize(priv));
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var pub = G.multiply(d);
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pub = Buffer.from(curve.encodePointHex(pub), 'hex');
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var parts = [];
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parts.push({name: 'curve', data: Buffer.from(curveName)});
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parts.push({name: 'Q', data: pub});
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var key = new Key({type: 'ecdsa', curve: curve, parts: parts});
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return (key);
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}
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function opensshCipherInfo(cipher) {
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var inf = {};
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switch (cipher) {
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case '3des-cbc':
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inf.keySize = 24;
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inf.blockSize = 8;
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inf.opensslName = 'des-ede3-cbc';
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break;
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case 'blowfish-cbc':
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inf.keySize = 16;
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inf.blockSize = 8;
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inf.opensslName = 'bf-cbc';
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break;
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case 'aes128-cbc':
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case 'aes128-ctr':
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case 'aes128-gcm@openssh.com':
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inf.keySize = 16;
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inf.blockSize = 16;
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inf.opensslName = 'aes-128-' + cipher.slice(7, 10);
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break;
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case 'aes192-cbc':
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case 'aes192-ctr':
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case 'aes192-gcm@openssh.com':
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inf.keySize = 24;
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inf.blockSize = 16;
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inf.opensslName = 'aes-192-' + cipher.slice(7, 10);
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break;
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case 'aes256-cbc':
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case 'aes256-ctr':
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case 'aes256-gcm@openssh.com':
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inf.keySize = 32;
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inf.blockSize = 16;
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inf.opensslName = 'aes-256-' + cipher.slice(7, 10);
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break;
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default:
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throw (new Error(
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'Unsupported openssl cipher "' + cipher + '"'));
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}
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return (inf);
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}
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