cloudfunctions/ClearingRedundantFolders/node_modules/sshpk/lib/dhe.js

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// Copyright 2017 Joyent, Inc.

module.exports = {
	DiffieHellman: DiffieHellman,
	generateECDSA: generateECDSA,
	generateED25519: generateED25519
};

var assert = require('assert-plus');
var crypto = require('crypto');
var Buffer = require('safer-buffer').Buffer;
var algs = require('./algs');
var utils = require('./utils');
var nacl = require('tweetnacl');

var Key = require('./key');
var PrivateKey = require('./private-key');

var CRYPTO_HAVE_ECDH = (crypto.createECDH !== undefined);

var ecdh = require('ecc-jsbn');
var ec = require('ecc-jsbn/lib/ec');
var jsbn = require('jsbn').BigInteger;

function DiffieHellman(key) {
	utils.assertCompatible(key, Key, [1, 4], 'key');
	this._isPriv = PrivateKey.isPrivateKey(key, [1, 3]);
	this._algo = key.type;
	this._curve = key.curve;
	this._key = key;
	if (key.type === 'dsa') {
		if (!CRYPTO_HAVE_ECDH) {
			throw (new Error('Due to bugs in the node 0.10 ' +
			    'crypto API, node 0.12.x or later is required ' +
			    'to use DH'));
		}
		this._dh = crypto.createDiffieHellman(
		    key.part.p.data, undefined,
		    key.part.g.data, undefined);
		this._p = key.part.p;
		this._g = key.part.g;
		if (this._isPriv)
			this._dh.setPrivateKey(key.part.x.data);
		this._dh.setPublicKey(key.part.y.data);

	} else if (key.type === 'ecdsa') {
		if (!CRYPTO_HAVE_ECDH) {
			this._ecParams = new X9ECParameters(this._curve);

			if (this._isPriv) {
				this._priv = new ECPrivate(
				    this._ecParams, key.part.d.data);
			}
			return;
		}

		var curve = {
			'nistp256': 'prime256v1',
			'nistp384': 'secp384r1',
			'nistp521': 'secp521r1'