Neos\Flow\Security\Cryptography\HashService::hashPassword PHP Method

    public function hashPassword($password, $strategyIdentifier = 'default')
    {
        /** @var $passwordHashingStrategy PasswordHashingStrategyInterface */
        list($passwordHashingStrategy, $strategyIdentifier) = $this->getPasswordHashingStrategyAndIdentifier($strategyIdentifier);
        $hashedPasswordAndSalt = $passwordHashingStrategy->hashPassword($password, $this->getEncryptionKey());
        return $strategyIdentifier . '=>' . $hashedPasswordAndSalt;
    }

 /**
  * Creates a new account and sets the given password and roles
  *
  * @param string $identifier Identifier of the account, must be unique
  * @param string $password The clear text password
  * @param array $roleIdentifiers Optionally an array of role identifiers to assign to the new account
  * @param string $authenticationProviderName Optional name of the authentication provider the account is affiliated with
  * @param string $passwordHashingStrategy Optional password hashing strategy to use for the password
  * @return Account A new account, not yet added to the account repository
  */
 public function createAccountWithPassword($identifier, $password, $roleIdentifiers = [], $authenticationProviderName = 'DefaultProvider', $passwordHashingStrategy = 'default')
 {
     $account = new Account();
     $account->setAccountIdentifier($identifier);
     $account->setCredentialsSource($this->hashService->hashPassword($password, $passwordHashingStrategy));
     $account->setAuthenticationProviderName($authenticationProviderName);
     $roles = [];
     foreach ($roleIdentifiers as $roleIdentifier) {
         $roles[] = $this->policyService->getRole($roleIdentifier);
     }
     $account->setRoles($roles);
     return $account;
 }