Custom Faker Provider for generating Symfony encoded password using UserPasswordEncoderInterface.

container.yaml

services:
      _defaults:
        autowire: true
        autoconfigure: true

    # Needed to autowire the first argument of the constructor for custom Faker providers
    Faker\Generator: ~

    App\Faker\Provider\:
        resource: '%kernel.project_dir%/src/App/Faker/Provider'
        public: true
        tags: ['hautelook_alice.faker.provider']

deps

hautelook/alice-bundle v1.4.1
nelmio/alice v2.3.1
symfony/symfony v3.3.0-BETA1

Fixture.yml

Symfony\Component\Security\Core\User\User:
    member:
        __construct: ['member', '<symfonyPassword("Symfony\Component\Security\Core\User\User", "member", "salt")>', ['ROLE_USER']]
    admin:
        __construct: ['admin', '<symfonyPassword("Symfony\Component\Security\Core\User\User", "admin", "salt")>', ['ROLE_ADMIN']]

SymfonyPasswordProvider.php

<?php declare(strict_types=1); # src/App/Faker/Provider/SymfonyPasswordProvider.php

namespace App\Faker\Provider;

use Faker\Generator;
use Faker\Provider\Base;
use Symfony\Component\Security\Core\Encoder\EncoderFactoryInterface;

final class SymfonyPasswordProvider extends Base
{
    /** @var EncoderFactoryInterface */
    private $encoderFactory;

    /**
     * {@inheritdoc}
     * @param EncoderFactoryInterface $encoderFactory
     */
    public function __construct(Generator $generator, EncoderFactoryInterface $encoderFactory)
    {
        parent::__construct($generator);

        $this->encoderFactory = $encoderFactory;
    }

    /**
     * @param string $userClass
     * @param string $plainPassword
     * @param string|null $salt
     *
     * @return string
     */
    public function symfonyPassword(string $userClass, string $plainPassword, string $salt = null): string
    {
        $password = $this->encoderFactory->getEncoder($userClass)->encodePassword($plainPassword, $salt);

        return $this->generator->parse($password);
    }
}

The , "salt" parameter in the fixtures is optional if you use bcrypt as encryption ($salt = null).

Thanks !