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Standard package

 <?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * Crypt_RSA allows to do following operations:
 *     - key pair generation
 *     - encryption and decryption
 *     - signing and sign validation
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This source file is subject to version 3.0 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to [email protected] so we can mail you a copy immediately.
 *
 * @category   Encryption
 * @package    Crypt_RSA
 * @author     Alexander Valyalkin <[email protected]>
 * @copyright  2005 Alexander Valyalkin
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    1.0.0
 * @link       http://pear.php.net/package/Crypt_RSA
 */

/**
 * RSA error handling facilities
 */
require_once 'Crypt/RSA/ErrorHandler.php';

/**
 * loader for math wrappers
 */
require_once 'Crypt/RSA/MathLoader.php';

/**
 * helper class for mange single key
 */
require_once 'Crypt/RSA/Key.php';

/**
 * helper class for manage key pair
 */
require_once 'Crypt/RSA/KeyPair.php';

/**
 * Crypt_RSA class, derived from Crypt_RSA_ErrorHandler
 *
 * Provides the following functions:
 *  - setParams($params) - sets parameters of current object
 *  - encrypt($plain_data, $key = null) - encrypts data
 *  - decrypt($enc_data, $key = null) - decrypts data
 *  - createSign($doc, $private_key = null) - signs document by private key
 *  - validateSign($doc, $signature, $public_key = null) - validates signature of document
 *
 * Example usage:
 *     // creating an error handler
 *     $error_handler = create_function('$obj', 'echo "error: ", $obj->getMessage(), "\n"');
 *
 *     // 1024-bit key pair generation
 *     $key_pair = new Crypt_RSA_KeyPair(1024);
 *
 *     // check consistence of Crypt_RSA_KeyPair object
 *     $error_handler($rsa_obj);
 *
 *     // creating Crypt_RSA object
 *     $rsa_obj = new Crypt_RSA;
 *
 *     // check consistence of Crypt_RSA object
 *     $error_handler($rsa_obj);
 *
 *     // set error handler on Crypt_RSA object ( see Crypt/RSA/ErrorHandler.php for details )
 *     $rsa_obj->setErrorHandler($error_handler);
 *
 *     // encryption (usually using public key)
 *     $enc_data = $rsa_obj->encrypt($plain_data, $key_pair->getPublicKey());
 *
 *     // decryption (usually using private key)
 *     $plain_data = $rsa_obj->decrypt($enc_data, $key_pair->getPrivateKey());
 *
 *     // signing
 *     $signature = $rsa_obj->createSign($document, $key_pair->getPrivateKey());
 *
 *     // signature checking
 *     $is_valid = $rsa_obj->validateSign($document, $signature, $key_pair->getPublicKey());
 *
 *     // signing many documents by one private key
 *     $rsa_obj = new Crypt_RSA(array('private_key' => $key_pair->getPrivateKey()));
 *     // check consistence of Crypt_RSA object
 *     $error_handler($rsa_obj);
 *     // set error handler ( see Crypt/RSA/ErrorHandler.php for details )
 *     $rsa_obj->setErrorHandler($error_handler);
 *     // sign many documents
 *     $sign_1 = $rsa_obj->sign($doc_1);
 *     $sign_2 = $rsa_obj->sign($doc_2);
 *     //...
 *     $sign_n = $rsa_obj->sign($doc_n);
 *
 *     // changing default hash function, which is used for sign
 *     // creating/validation
 *     $rsa_obj->setParams(array('hash_func' => 'md5'));
 *
 *     // using factory() method instead of constructor (it returns PEAR_Error object on failure)
 *     $rsa_obj = &Crypt_RSA::factory();
 *     if (PEAR::isError($rsa_obj)) {
 *         echo "error: ", $rsa_obj->getMessage(), "\n";
 *     }
 *
 * @category   Encryption
 * @package    Crypt_RSA
 * @author     Alexander Valyalkin <[email protected]>
 * @copyright  2005 Alexander Valyalkin
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @link       http://pear.php.net/package/Crypt_RSA
 * @version    @package_version@
 * @access     public
 */
class Crypt_RSA extends Crypt_RSA_ErrorHandler
{
    /**
     * Reference to math wrapper, which is used to
     * manipulate large integers in RSA algorithm.
     *
     * @var object of Crypt_RSA_Math_* class
     * @access private
     */
    var $_math_obj;

    /**
     * key for encryption, which is used by encrypt() method
     *
     * @var object of Crypt_RSA_KEY class
     * @access private
     */
    var $_enc_key;

    /**
     * key for decryption, which is used by decrypt() method
     *
     * @var object of Crypt_RSA_KEY class
     * @access private
     */
    var $_dec_key;

    /**
     * public key, which is used by validateSign() method
     *
     * @var object of Crypt_RSA_KEY class
     * @access private
     */
    var $_public_key;

    /**
     * private key, which is used by createSign() method
     *
     * @var object of Crypt_RSA_KEY class
     * @access private
     */
    var $_private_key;

    /**
     * name of hash function, which is used by validateSign()
     * and createSign() methods. Default hash function is SHA-1
     *
     * @var string
     * @access private
     */
    var $_hash_func = 'sha1';

    /**
     * Crypt_RSA constructor.
     *
     * @param array $params
     *        Optional associative array of parameters, such as:
     *        enc_key, dec_key, private_key, public_key, hash_func.
     *        See setParams() method for more detailed description of
     *        these parameters.
     *
     * @param string $wrapper_name
     *        Name of math wrapper, which will be used to
     *        perform different operations with big integers.
     *        See contents of Crypt/RSA/Math folder for examples of wrappers.
     *        Read docs/Crypt_RSA/docs/math_wrappers.txt for details.
     *
     * @param string $error_handler   name of error handler function
     *
     * @access public
     */
    function Crypt_RSA($params = null, $wrapper_name = 'default', $error_handler = '')
    {
        // set error handler
        $this->setErrorHandler($error_handler);
        // try to load math wrapper
        $obj = &Crypt_RSA_MathLoader::loadWrapper($wrapper_name);
        if (PEAR::isError($obj)) {
            // error during loading of math wrapper
            // Crypt_RSA object is partially constructed.
            $this->pushError($obj);
            return;
        }
        $this->_math_obj = &$obj;

        if (!is_null($params)) {
            if (!$this->setParams($params)) {
                // error in Crypt_RSA::setParams() function
                return;
            }
        }
    }

    /**
     * Crypt_RSA factory.
     *
     * @param array $params
     *        Optional associative array of parameters, such as:
     *        enc_key, dec_key, private_key, public_key, hash_func.
     *        See setParams() method for more detailed description of
     *        these parameters.
     *
     * @param string $wrapper_name
     *        Name of math wrapper, which will be used to
     *        perform different operations with big integers.
     *        See contents of Crypt/RSA/Math folder for examples of wrappers.
     *        Read docs/Crypt_RSA/docs/math_wrappers.txt for details.
     *
     * @return object  new Crypt_RSA object on success or PEAR_Error object on failure
     * @access public
     */
    function &factory($params = null, $wrapper_name = 'default')
    {
        $obj = &new Crypt_RSA($params, $wrapper_name);
        if ($obj->isError()) {
            // error during creating a new object. Retrurn PEAR_Error object
            return $obj->getLastError();
        }
        // object created successfully. Return it
        return $obj;
    }

    /**
     * Accepts any combination of available parameters as associative array:
     *     enc_key - encryption key for encrypt() method
     *     dec_key - decryption key for decrypt() method
     *     public_key - key for validateSign() method
     *     private_key - key for createSign() method
     *     hash_func - name of hash function, which will be used to create and validate sign
     *
     * @param array $params
     *        associative array of permitted parameters (see above)
     *
     * @return bool   true on success or false on error
     * @access public
     */
    function setParams($params)
    {
        if (!is_array($params)) {
            $obj = PEAR::raiseError('parameters must be passed to function as associative array', CRYPT_RSA_ERROR_WRONG_PARAMS);
            $this->pushError($obj);
            return false;
        }

        if (isset($params['enc_key'])) {
            if (Crypt_RSA_Key::isValid($params['enc_key'])) {
                $this->_enc_key = $params['enc_key'];
            } else {
                $obj = PEAR::raiseError('wrong encryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
                $this->pushError($obj);
                return false;
            }
        }
        if (isset($params['dec_key'])) {
            if (Crypt_RSA_Key::isValid($params['dec_key'])) {
                $this->_dec_key = $params['dec_key'];
            } else {
                $obj = PEAR::raiseError('wrong decryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
                $this->pushError($obj);
                return false;
            }
        }
        if (isset($params['private_key'])) {
            if (Crypt_RSA_Key::isValid($params['private_key'])) {
                if ($params['private_key']->getKeyType() != 'private') {
                    $obj = PEAR::raiseError('private key must have "private" attribute', CRYPT_RSA_ERROR_WRONG_KEY_TYPE);
                    $this->pushError($obj);
                    return false;
                }
                $this->_private_key = $params['private_key'];
            } else {
                $obj = PEAR::raiseError('wrong private key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
                $this->pushError($obj);
                return false;
            }
        }
        if (isset($params['public_key'])) {
            if (Crypt_RSA_Key::isValid($params['public_key'])) {
                if ($params['public_key']->getKeyType() != 'public') {
                    $obj = PEAR::raiseError('public key must have "public" attribute', CRYPT_RSA_ERROR_WRONG_KEY_TYPE);
                    $this->pushError($obj);
                    return false;
                }
                $this->_public_key = $params['public_key'];
            } else {
                $obj = PEAR::raiseError('wrong public key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
                $this->pushError($obj);
                return false;
            }
        }
        if (isset($params['hash_func'])) {
            if (!function_exists($params['hash_func'])) {
                $obj = PEAR::raiseError('cannot find hash function with name [' . $params['hash_func'] . ']', CRYPT_RSA_ERROR_WRONG_HASH_FUNC);
                $this->pushError($obj);
                return false;
            }
            $this->_hash_func = $params['hash_func'];
        }
        return true; // all ok
    }

    /**
     * Ecnrypts $plain_data by the key $this->_enc_key or $key.
     *
     * @param string $plain_data  data, which must be encrypted
     * @param object $key         encryption key (object of Crypt_RSA_Key class)
     * @return mixed
     *         encrypted data as string on success or false on error
     *
     * @access public
     */
    function encrypt($plain_data, $key = null)
    {
        $enc_data = $this->encryptBinary($plain_data, $key);
        if ($enc_data !== false) {
            return base64_encode($enc_data);
        }
        // error during encripting data
        return false;
    }

    /**
     * Ecnrypts $plain_data by the key $this->_enc_key or $key.
     *
     * @param string $plain_data  data, which must be encrypted
     * @param object $key         encryption key (object of Crypt_RSA_Key class)
     * @return mixed
     *         encrypted data as binary string on success or false on error
     *
     * @access public
     */
    function encryptBinary($plain_data, $key = null)
    {
        if (is_null($key)) {
            // use current encryption key
            $key = $this->_enc_key;
        } elseif (!Crypt_RSA_Key::isValid($key)) {
            $obj = PEAR::raiseError('invalid encryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
            $this->pushError($obj);
            return false;
        }

        // append tail \x01 to plain data. It needs for correctly decrypting of data
        $plain_data .= "\x01";

        $plain_data = $this->_math_obj->bin2int($plain_data);
        $exp = $this->_math_obj->bin2int($key->getExponent());
        $modulus = $this->_math_obj->bin2int($key->getModulus());

        // divide plain data into chunks
        $data_len = $this->_math_obj->bitLen($plain_data);
        $chunk_len = $key->getKeyLength() - 1;
        $block_len = (int) ceil($chunk_len / 8);
        $curr_pos = 0;
        $enc_data = '';
        while ($curr_pos < $data_len) {
            $tmp = $this->_math_obj->subint($plain_data, $curr_pos, $chunk_len);
            $enc_data .= str_pad(
                $this->_math_obj->int2bin($this->_math_obj->powmod($tmp, $exp, $modulus)),
                $block_len,
                "\0"
            );
            $curr_pos += $chunk_len;
        }
        return $enc_data;
    }

    /**
     * Decrypts $enc_data by the key $this->_dec_key or $key.
     *
     * @param string $enc_data  encrypted data as string
     * @param object $key       decryption key (object of RSA_Crypt_Key class)
     * @return mixed
     *         decrypted data as string on success or false on error
     *
     * @access public
     */
    function decrypt($enc_data, $key = null)
    {
        $enc_data = base64_decode($enc_data);
        return $this->decryptBinary($enc_data, $key);
    }

    /**
     * Decrypts $enc_data by the key $this->_dec_key or $key.
     *
     * @param string $enc_data  encrypted data as binary string
     * @param object $key       decryption key (object of RSA_Crypt_Key class)
     * @return mixed
     *         decrypted data as string on success or false on error
     *
     * @access public
     */
    function decryptBinary($enc_data, $key = null)
    {
        if (is_null($key)) {
            // use current decryption key
            $key = $this->_dec_key;
        } elseif (!Crypt_RSA_Key::isValid($key)) {
            $obj = PEAR::raiseError('invalid decryption key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
            $this->pushError($obj);
            return false;
        }

        $exp = $this->_math_obj->bin2int($key->getExponent());
        $modulus = $this->_math_obj->bin2int($key->getModulus());

        $data_len = strlen($enc_data);
        $chunk_len = $key->getKeyLength() - 1;
        $block_len = (int) ceil($chunk_len / 8);
        $curr_pos = 0;
        $bit_pos = 0;
        $plain_data = $this->_math_obj->bin2int("\0");
        while ($curr_pos < $data_len) {
            $tmp = $this->_math_obj->bin2int(substr($enc_data, $curr_pos, $block_len));
            $tmp = $this->_math_obj->powmod($tmp, $exp, $modulus);
            $plain_data = $this->_math_obj->bitOr($plain_data, $tmp, $bit_pos);
            $bit_pos += $chunk_len;
            $curr_pos += $block_len;
        }
        $result = $this->_math_obj->int2bin($plain_data);

        // delete tail, containing of \x01
        $tail = ord($result{strlen($result) - 1});
        if ($tail != 1) {
            $obj = PEAR::raiseError("Error tail of decrypted text = {$tail}. Expected 1", CRYPT_RSA_ERROR_WRONG_TAIL);
            $this->pushError($obj);
            return false;
        }
        return substr($result, 0, -1);
    }

    /**
     * Creates sign for document $document, using $this->_private_key or $private_key
     * as private key and $this->_hash_func or $hash_func as hash function.
     *
     * @param string $document     document, which must be signed
     * @param object $private_key  private key (object of Crypt_RSA_Key type)
     * @param string $hash_func    name of hash function, which will be used during signing
     * @return mixed
     *         signature of $document as string on success or false on error
     *
     * @access public
     */
    function createSign($document, $private_key = null, $hash_func = null)
    {
        // check private key
        if (is_null($private_key)) {
            $private_key = $this->_private_key;
        } elseif (!Crypt_RSA_Key::isValid($private_key)) {
            $obj = PEAR::raiseError('invalid private key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
            $this->pushError($obj);
            return false;
        }
        if ($private_key->getKeyType() != 'private') {
            $obj = PEAR::raiseError('signing key must be private', CRYPT_RSA_ERROR_NEED_PRV_KEY);
            $this->pushError($obj);
            return false;
        }

        // check hash_func
        if (is_null($hash_func)) {
            $hash_func = $this->_hash_func;
        }
        if (!function_exists($hash_func)) {
            $obj = PEAR::raiseError('cannot find hash function with name [' . $hash_func . ']', CRYPT_RSA_ERROR_WRONG_HASH_FUNC);
            $this->pushError($obj);
            return false;
        }

        return $this->encrypt($hash_func($document), $private_key);
    }

    /**
     * Validates $signature for document $document with public key $this->_public_key
     * or $public_key and hash function $this->_hash_func or $hash_func.
     *
     * @param string $document    document, signature of which must be validated
     * @param string $signature   signature, which must be validated
     * @param object $public_key  public key (object of Crypt_RSA_Key class)
     * @param string $hash_func   hash function, which will be used during validating signature
     * @return mixed
     *         true, if signature of document is valid
     *         false, if signature of document is invalid
     *         null on error
     *
     * @access public
     */
    function validateSign($document, $signature, $public_key = null, $hash_func = null)
    {
        // check public key
        if (is_null($public_key)) {
            $public_key = $this->_public_key;
        } elseif (!Crypt_RSA_Key::isValid($public_key)) {
            $obj = PEAR::raiseError('invalid public key. It must be an object of Crypt_RSA_Key class', CRYPT_RSA_ERROR_WRONG_KEY);
            $this->pushError($obj);
            return null;
        }
        if ($public_key->getKeyType() != 'public') {
            $obj = PEAR::raiseError('validating key must be public', CRYPT_RSA_ERROR_NEED_PUB_KEY);
            $this->pushError($obj);
            return null;
        }

        // check hash_func
        if (is_null($hash_func)) {
            $hash_func = $this->_hash_func;
        }
        if (!function_exists($hash_func)) {
            $obj = PEAR::raiseError('cannot find hash function with name [' . $hash_func . ']', CRYPT_RSA_ERROR_WRONG_HASH_FUNC);
            $this->pushError($obj);
            return null;
        }

        return $hash_func($document) == $this->decrypt($signature, $public_key);
    }
}

?> 

And the bbug is back after creating a new post,
– used featured page
– no latest posts

and the latest posts are still displayed and no featured page are displayed in real mode whereas the preview mode is OK

As the Polylang extension was not enabled, it was normal 😉
I’ve re-enabled it and you can now see the “wrong version”,
no featured page at all.