'use strict';
var common = require('../common');
var assert = require('assert');
var stream = require('stream');
var util = require('util');

if (!common.hasCrypto) {
  common.skip('missing crypto');
  return;
}
var crypto = require('crypto');

// Small stream to buffer converter
function Stream2buffer(callback) {
  stream.Writable.call(this);

  this._buffers = [];
  this.once('finish', function() {
    callback(null, Buffer.concat(this._buffers));
  });
}
util.inherits(Stream2buffer, stream.Writable);

Stream2buffer.prototype._write = function(data, encodeing, done) {
  this._buffers.push(data);
  return done(null);
};

if (!common.hasFipsCrypto) {
  // Create an md5 hash of "Hallo world"
  var hasher1 = crypto.createHash('md5');
  hasher1.pipe(new Stream2buffer(common.mustCall(function end(err, hash) {
    assert.equal(err, null);
    assert.equal(hash.toString('hex'), '06460dadb35d3d503047ce750ceb2d07');
  })));
  hasher1.end('Hallo world');

  // Simpler check for unpipe, setEncoding, pause and resume
  crypto.createHash('md5').unpipe({});
  crypto.createHash('md5').setEncoding('utf8');
  crypto.createHash('md5').pause();
  crypto.createHash('md5').resume();
}

// Decipher._flush() should emit an error event, not an exception.
const key = Buffer.from('48fb56eb10ffeb13fc0ef551bbca3b1b', 'hex');
const badkey = Buffer.from('12341234123412341234123412341234', 'hex');
const iv = Buffer.from('6d358219d1f488f5f4eb12820a66d146', 'hex');
const cipher = crypto.createCipheriv('aes-128-cbc', key, iv);
const decipher = crypto.createDecipheriv('aes-128-cbc', badkey, iv);

cipher.pipe(decipher)
  .on('error', common.mustCall(function end(err) {
    assert(/bad decrypt/.test(err));
  }));

cipher.end('Papaya!');  // Should not cause an unhandled exception.