Proposal to support new types of password encryption

Problem/Motivation

Proposal to support new types of password encryption

Please add here why you believe this is needed and for which setups so we can gauge the perceived benefit benefit of this feature.

Proposed resolution

class LdapEntryProvisionSubscriber implements EventSubscriberInterface, LdapUserAttributesInterface {
....
private function fetchDrupalAccountAttribute(string $token): void {
    // Trailing period to allow for empty value.
    [
      $attribute_type,
      $attribute_name,
      $attribute_conversion,
	  <strong>$attribute_salt_length</strong>,
    ] = explode('.', $token . '..'); <strong>// new: second point added</strong>
    $value = NULL;

    if ($attribute_type === 'field' || $attribute_type === 'property') {
      $value = $this->fetchDrupalAccountField($attribute_name);
    }
    elseif ($attribute_type === 'password') {
      $value = $this->fetchDrupalAccountPassword($attribute_name);
      if (empty($value)) {
        // Do not evaluate empty passwords, to avoid overwriting them.
        return;
      }
    }
    
	<strong>$attribute_salt_length = $attribute_salt_length == 0 ? 8 : intval($attribute_salt_length);
    $salt = substr(crypt(uniqid(),'$6$azerty'), 15,$attribute_salt_length);</strong>

    if ($attribute_conversion === 'to-md5') {
      $value = md5($value);
    }
    elseif ($attribute_conversion === 'to-lowercase') {
      $value = mb_strtolower($value);
    } <strong>
	elseif ($attribute_conversion === 'to-sha256') {
      $value = crypt($value,'$5$'.$salt);
    } 
	elseif ($attribute_conversion === 'to-sha512') {
      $value = crypt($value,'$6$'.$salt);
    } 
	elseif ($attribute_conversion === 'to-md4') {
      // MD4 for MS-NT password
      $value = strtoupper( hash( "md4", iconv( "UTF-8", "UTF-16LE", $value ) ) );      
    }</strong>

    $this->tokens[sprintf('[%s]', $token)] = $value;
  }
....
}