RsaAuthService.php

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<?php
namespace TYPO3\CMS\Rsaauth;

// Include backends
class RsaAuthService extends \TYPO3\CMS\Sv\AuthenticationService {

    protected $backend = NULL;

    public $extKey = 'rsaauth';

    public $prefixId = 'tx_rsaauth_sv1';

    public $scriptRelPath = 'sv1/class.tx_rsaauth_sv1.php';

    public function processLoginData(array &$loginData, $passwordTransmissionStrategy) {
        $isProcessed = FALSE;
        if ($passwordTransmissionStrategy === 'rsa') {
            $storage = \TYPO3\CMS\Rsaauth\Storage\StorageFactory::getStorage();
            // Decrypt the password
            $password = $loginData['uident'];
            $key = $storage->get();
            if ($key != NULL && substr($password, 0, 4) === 'rsa:') {
                // Decode password and store it in loginData
                $decryptedPassword = $this->backend->decrypt($key, substr($password, 4));
                if ($decryptedPassword !== NULL) {
                    $loginData['uident_text'] = $decryptedPassword;
                    $isProcessed = TRUE;
                } else {
                    if ($this->pObj->writeDevLog) {
                        \TYPO3\CMS\Core\Utility\GeneralUtility::devLog('Process login data: Failed to RSA decrypt password', 'TYPO3\\CMS\\Rsaauth\\RsaAuthService');
                    }
                }
                // Remove the key
                $storage->put(NULL);
            } else {
                if ($this->pObj->writeDevLog) {
                    \TYPO3\CMS\Core\Utility\GeneralUtility::devLog('Process login data: passwordTransmissionStrategy has been set to "rsa" but no rsa encrypted password has been found.', 'TYPO3\\CMS\\Rsaauth\\RsaAuthService');
                }
            }
        }
        return $isProcessed;
    }

    public function init() {
        $available = parent::init();
        if ($available) {
            // Get the backend
            $this->backend = \TYPO3\CMS\Rsaauth\Backend\BackendFactory::getBackend();
            if (is_null($this->backend)) {
                $available = FALSE;
            }
        }
        return $available;
    }

}