eventespresso / event-espresso-core

core/EE_Encryption.core.php

Indentation +670 added lines, -670 removed lines

@@ -16,676 +16,676 @@
 class EE_Encryption
 {
 
-    /**
-     * key used for saving the encryption key to the wp_options table
-     */
-    const ENCRYPTION_OPTION_KEY = 'ee_encryption_key';
-
-    /**
-     * the OPENSSL cipher method used
-     */
-    const OPENSSL_CIPHER_METHOD = 'AES-128-CBC';
-
-    /**
-     * the OPENSSL cipher method used
-     */
-    const OPENSSL_CIPHER_METHOD_OPTION_NAME = 'ee_openssl_cipher_method';
-
-    /**
-     * the OPENSSL digest method used
-     */
-    const OPENSSL_DIGEST_METHOD = 'sha512';
-
-    /**
-     * separates the encrypted text from the initialization vector
-     */
-    const OPENSSL_IV_DELIMITER = ':iv:';
-
-    /**
-     * appended to text encrypted using the acme encryption
-     */
-    const ACME_ENCRYPTION_FLAG = '::ae';
-
-
-
-    /**
-     * instance of the EE_Encryption object
-     */
-    protected static $_instance;
-
-    /**
-     * @var string $_encryption_key
-     */
-    protected $_encryption_key;
-
-    /**
-     * @var string $cipher_method
-     */
-    private $cipher_method = '';
-
-    /**
-     * @var array $cipher_methods
-     */
-    private $cipher_methods = array();
-
-    /**
-     * @var array $digest_methods
-     */
-    private $digest_methods = array();
-
-    /**
-     * @var boolean $_use_openssl_encrypt
-     */
-    protected $_use_openssl_encrypt = false;
-
-    /**
-     * @var boolean $_use_mcrypt
-     */
-    protected $_use_mcrypt = false;
-
-    /**
-     * @var boolean $_use_base64_encode
-     */
-    protected $_use_base64_encode = false;
-
-
-
-    /**
-     * protected constructor to prevent direct creation
-     */
-    protected function __construct()
-    {
-        if (! defined('ESPRESSO_ENCRYPT')) {
-            define('ESPRESSO_ENCRYPT', true);
-        }
-        if (extension_loaded('openssl')) {
-            $this->_use_openssl_encrypt = true;
-        } else if (extension_loaded('mcrypt')) {
-            $this->_use_mcrypt = true;
-        }
-        if (function_exists('base64_encode')) {
-            $this->_use_base64_encode = true;
-        }
-    }
-
-
-
-    /**
-     * singleton method used to instantiate class object
-     *
-     * @return EE_Encryption
-     */
-    public static function instance()
-    {
-        // check if class object is instantiated
-        if (! self::$_instance instanceof EE_Encryption) {
-            self::$_instance = new self();
-        }
-        return self::$_instance;
-    }
-
-
-
-    /**
-     * get encryption key
-     *
-     * @return string
-     */
-    public function get_encryption_key()
-    {
-        // if encryption key has not been set
-        if (empty($this->_encryption_key)) {
-            // retrieve encryption_key from db
-            $this->_encryption_key = get_option(EE_Encryption::ENCRYPTION_OPTION_KEY, '');
-            // WHAT?? No encryption_key in the db ??
-            if ($this->_encryption_key === '') {
-                // let's make one. And md5 it to make it just the right size for a key
-                $new_key = md5($this->generate_random_string());
-                // now save it to the db for later
-                add_option(EE_Encryption::ENCRYPTION_OPTION_KEY, $new_key);
-                // here's the key - FINALLY !
-                $this->_encryption_key = $new_key;
-            }
-        }
-        return $this->_encryption_key;
-    }
-
-
-
-    /**
-     * encrypts data
-     *
-     * @param string $text_string - the text to be encrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    public function encrypt($text_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($text_string)) {
-            return $text_string;
-        }
-        if ($this->_use_openssl_encrypt) {
-            $encrypted_text = $this->openssl_encrypt($text_string);
-        } else {
-            $encrypted_text = $this->acme_encrypt($text_string);
-        }
-        return $encrypted_text;
-    }
-
-
-
-    /**
-     * decrypts data
-     *
-     * @param string $encrypted_text - the text to be decrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    public function decrypt($encrypted_text = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($encrypted_text)) {
-            return $encrypted_text;
-        }
-        // if PHP's mcrypt functions are installed then we'll use them
-        if ($this->_use_openssl_encrypt) {
-            $decrypted_text = $this->openssl_decrypt($encrypted_text);
-        } else {
-            $decrypted_text = $this->acme_decrypt($encrypted_text);
-        }
-        return $decrypted_text;
-    }
-
-
-
-    /**
-     * encodes string with PHP's base64 encoding
-     *
-     * @see http://php.net/manual/en/function.base64-encode.php
-     * @param string $text_string the text to be encoded
-     * @return string
-     */
-    public function base64_string_encode($text_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($text_string) || ! $this->_use_base64_encode) {
-            return $text_string;
-        }
-        // encode
-        return base64_encode($text_string);
-    }
-
-
-
-    /**
-     * decodes string that has been encoded with PHP's base64 encoding
-     *
-     * @see http://php.net/manual/en/function.base64-encode.php
-     * @param string $encoded_string the text to be decoded
-     * @return string
-     */
-    public function base64_string_decode($encoded_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($encoded_string) || ! $this->valid_base_64($encoded_string)) {
-            return $encoded_string;
-        }
-        // decode
-        return base64_decode($encoded_string);
-    }
-
-
-
-    /**
-     * encodes  url string with PHP's base64 encoding
-     *
-     * @see http://php.net/manual/en/function.base64-encode.php
-     * @param string $text_string the text to be encoded
-     * @return string
-     */
-    public function base64_url_encode($text_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($text_string) || ! $this->_use_base64_encode) {
-            return $text_string;
-        }
-        // encode
-        $encoded_string = base64_encode($text_string);
-        // remove chars to make encoding more URL friendly
-        return strtr($encoded_string, '+/=', '-_,');
-    }
-
-
-
-    /**
-     * decodes  url string that has been encoded with PHP's base64 encoding
-     *
-     * @see http://php.net/manual/en/function.base64-encode.php
-     * @param string $encoded_string the text to be decoded
-     * @return string
-     */
-    public function base64_url_decode($encoded_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($encoded_string) || ! $this->valid_base_64($encoded_string)) {
-            return $encoded_string;
-        }
-        // replace previously removed characters
-        $encoded_string = strtr($encoded_string, '-_,', '+/=');
-        // decode
-        return base64_decode($encoded_string);
-    }
-
-
-
-    /**
-     * encrypts data using PHP's openssl functions
-     *
-     * @param string $text_string the text to be encrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function openssl_encrypt($text_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($text_string)) {
-            return $text_string;
-        }
-        $this->cipher_method = $this->getCipherMethod();
-        // get initialization vector size
-        $iv_size = openssl_cipher_iv_length($this->cipher_method);
-        // generate initialization vector.
-        // The second parameter ("crypto_strong") is passed by reference,
-        // and is used to determines if the algorithm used was "cryptographically strong"
-        // openssl_random_pseudo_bytes() will toggle it to either true or false
-        $iv = openssl_random_pseudo_bytes($iv_size, $is_strong);
-        if ($iv === false || $is_strong === false) {
-            throw new RuntimeException(
-                esc_html__('Failed to generate OpenSSL initialization vector.', 'event_espresso')
-            );
-        }
-        // encrypt it
-        $encrypted_text = openssl_encrypt(
-            $text_string,
-            $this->cipher_method,
-            $this->getDigestHashValue(),
-            0,
-            $iv
-        );
-        // append the initialization vector
-        $encrypted_text .= EE_Encryption::OPENSSL_IV_DELIMITER . $iv;
-        // trim and maybe encode
-        return $this->_use_base64_encode
-            ? trim(base64_encode($encrypted_text))
-            : trim($encrypted_text);
-    }
-
-
-
-    /**
-     * Returns a cipher method that has been verified to work.
-     * First checks if the cached cipher has  been set already and if so, returns that.
-     * Then tests the incoming default and returns that if it's good.
-     * If not, then it retrieves the previously tested and saved cipher method.
-     * But if that doesn't exist, then
-     *
-     * @param string $cipher_method
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function getCipherMethod($cipher_method = EE_Encryption::OPENSSL_CIPHER_METHOD)
-    {
-        if($this->cipher_method !== ''){
-            return $this->cipher_method;
-        }
-        // verify that the default cipher method can produce an initialization vector
-        if (openssl_cipher_iv_length($cipher_method) === false) {
-            // nope? okay let's get what we found in the past to work
-            $cipher_method = get_option(EE_Encryption::OPENSSL_CIPHER_METHOD_OPTION_NAME, '');
-            // oops... haven't tested available cipher methods yet
-            if($cipher_method === '') {
-                $cipher_method = $this->getAvailableCipherMethod($cipher_method);
-            }
-        }
-        return $cipher_method;
-    }
-
-
-
-    /**
-     * @param string $cipher_method
-     * @return string
-     * @throws \RuntimeException
-     */
-    protected function getAvailableCipherMethod($cipher_method)
-    {
-        // verify that the incoming cipher method can produce an initialization vector
-        if (openssl_cipher_iv_length($cipher_method) === false) {
-            // nope? okay then get then check the list of available cipher methods
-            // what? there's no list? then generate that list and cache it,
-            // then rewind the list to the first item, which should match the default
-            if (empty($this->cipher_methods)) {
-                $this->cipher_methods = openssl_get_cipher_methods();
-                reset($this->cipher_methods);
-            }
-            // advance to the next cipher in the list
-            $cipher_method = next($this->cipher_methods);
-            if($cipher_method === false){
-                throw new RuntimeException(
-                    esc_html__(
-                        'OpenSSL support appears to be enabled on the server, but no cipher methods are available. Please contact the server administrator.',
-                        'event_espresso'
-                    )
-                );
-            }
-            // verify that the next cipher method works
-            return $this->getAvailableCipherMethod($cipher_method);
-        }
-        // if we've gotten this far, then we found an available cipher method that works
-        // so save that for next time
-        update_option(
-            EE_Encryption::OPENSSL_CIPHER_METHOD_OPTION_NAME,
-            $cipher_method
-        );
-        return $cipher_method;
-    }
-
-
-
-    /**
-     * decrypts data that has been encrypted with PHP's openssl functions
-     *
-     * @param string $encrypted_text the text to be decrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function openssl_decrypt($encrypted_text = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($encrypted_text)) {
-            return $encrypted_text;
-        }
-        // decode
-        $encrypted_text = $this->valid_base_64($encrypted_text)
-            ? base64_decode($encrypted_text)
-            : $encrypted_text;
-        $encrypted_components = explode(
-            EE_Encryption::OPENSSL_IV_DELIMITER,
-            $encrypted_text,
-            2
-        );
-        // check that iv exists, and if not, maybe text was encoded using mcrypt?
-        if ($this->_use_mcrypt && ! isset($encrypted_components[1])) {
-            return $this->m_decrypt($encrypted_text);
-        }
-        // decrypt it
-        $decrypted_text = openssl_decrypt(
-            $encrypted_components[0],
-            $this->getCipherMethod(),
-            $this->getDigestHashValue(),
-            0,
-            $encrypted_components[1]
-        );
-        $decrypted_text = trim($decrypted_text);
-        return $decrypted_text;
-    }
-
-
-
-    /**
-     * Computes the digest hash value using the specified digest method.
-     * If that digest method fails to produce a valid hash value,
-     * then we'll grab the next digest method and recursively try again until something works.
-     *
-     * @param string $digest_method
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function getDigestHashValue($digest_method = EE_Encryption::OPENSSL_DIGEST_METHOD){
-        $digest_hash_value = openssl_digest($this->get_encryption_key(), $digest_method);
-        if ($digest_hash_value === false) {
-            return $this->getDigestHashValue($this->getDigestMethod());
-        }
-        return $digest_hash_value;
-    }
-
-
-
-    /**
-     * Returns the NEXT element in the $digest_methods array.
-     * If the $digest_methods array is empty, then we populate it
-     * with the available values returned from openssl_get_md_methods().
-     * But first we will advance to the last element, so that when prev() is called,
-     * we'll get what was originally the second to last element.
-     * Why?
-     * Because the last elements returned by openssl_get_md_methods()
-     * are typically the newer SHA methods like SHA512, and we want to try them first.
-     * We've already tried SHA512 as the default set by the OPENSSL_DIGEST_METHOD constant,
-     * but that will get skipped as soon as prev() is called.
-     *
-     * @return string
-     * @throws \RuntimeException
-     */
-    protected function getDigestMethod(){
-        if (empty($this->digest_methods)) {
-            $this->digest_methods = openssl_get_md_methods();
-            end($this->digest_methods);
-        }
-        $digest_method = prev($this->digest_methods);
-        if ($digest_method === false) {
-            throw new RuntimeException(
-                esc_html__(
-                    'OpenSSL support appears to be enabled on the server, but no digest methods are available. Please contact the server administrator.',
-                    'event_espresso'
-                )
-            );
-        }
-        return $digest_method;
-    }
-
-
-    /**
-     * encrypts data for acme servers that didn't bother to install PHP mcrypt
-     *
-     * @see http://stackoverflow.com/questions/800922/how-to-encrypt-string-without-mcrypt-library-in-php
-     * @param string $text_string the text to be decrypted
-     * @return string
-     */
-    protected function acme_encrypt($text_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($text_string)) {
-            return $text_string;
-        }
-        $key_bits = str_split(
-            str_pad(
-                '',
-                strlen($text_string),
-                $this->get_encryption_key(),
-                STR_PAD_RIGHT
-            )
-        );
-        $string_bits = str_split($text_string);
-        foreach ($string_bits as $k => $v) {
-            $temp = ord($v) + ord($key_bits[$k]);
-            $string_bits[$k] = chr($temp > 255 ? ($temp - 256) : $temp);
-        }
-        $encrypted_text = implode('', $string_bits);
-        $encrypted_text .= EE_Encryption::ACME_ENCRYPTION_FLAG;
-        return $this->_use_base64_encode
-            ? base64_encode($encrypted_text)
-            : $encrypted_text;
-    }
-
-
-
-    /**
-     * decrypts data for acme servers that didn't bother to install PHP mcrypt
-     *
-     * @see http://stackoverflow.com/questions/800922/how-to-encrypt-string-without-mcrypt-library-in-php
-     * @param string $encrypted_text the text to be decrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function acme_decrypt($encrypted_text = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($encrypted_text)) {
-            return $encrypted_text;
-        }
-        // decode the data ?
-        $encrypted_text = $this->valid_base_64($encrypted_text)
-            ? base64_decode($encrypted_text)
-            : $encrypted_text;
-        if (
-            $this->_use_mcrypt
-            && strpos($encrypted_text, EE_Encryption::ACME_ENCRYPTION_FLAG) === false
-        ){
-            return $this->m_decrypt($encrypted_text);
-        }
-        $encrypted_text = substr($encrypted_text, 0, -4);
-        $key_bits = str_split(
-            str_pad(
-                '',
-                strlen($encrypted_text),
-                $this->get_encryption_key(),
-                STR_PAD_RIGHT
-            )
-        );
-        $string_bits = str_split($encrypted_text);
-        foreach ($string_bits as $k => $v) {
-            $temp = ord($v) - ord($key_bits[$k]);
-            $string_bits[$k] = chr($temp < 0 ? ($temp + 256) : $temp);
-        }
-        return implode('', $string_bits);
-    }
-
-
-
-    /**
-     * @see http://stackoverflow.com/questions/2556345/detect-base64-encoding-in-php#30231906
-     * @param $string
-     * @return bool
-     */
-    protected function valid_base_64($string)
-    {
-        // ensure data is a string
-        if (! is_string($string) || ! $this->_use_base64_encode) {
-            return false;
-        }
-        $decoded = base64_decode($string, true);
-        // Check if there is no invalid character in string
-        if (! preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $string)) {
-            return false;
-        }
-        // Decode the string in strict mode and send the response
-        if (! base64_decode($string, true)) {
-            return false;
-        }
-        // Encode and compare it to original one
-        return base64_encode($decoded) === $string;
-    }
-
-
-
-    /**
-     * generate random string
-     *
-     * @see http://stackoverflow.com/questions/637278/what-is-the-best-way-to-generate-a-random-key-within-php
-     * @param int $length number of characters for random string
-     * @return string
-     */
-    public function generate_random_string($length = 40)
-    {
-        $iterations = ceil($length / 40);
-        $random_string = '';
-        for ($i = 0; $i < $iterations; $i++) {
-            $random_string .= sha1(microtime(true) . mt_rand(10000, 90000));
-        }
-        $random_string = substr($random_string, 0, $length);
-        return $random_string;
-    }
-
-
-
-    /**
-     * encrypts data using PHP's mcrypt functions
-     *
-     * @deprecated 4.9.39
-     * @param string $text_string
-     * @internal   param $string - the text to be encrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function m_encrypt($text_string = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($text_string)) {
-            return $text_string;
-        }
-        // get the initialization vector size
-        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
-        // initialization vector
-        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
-        if ($iv === false) {
-            throw new RuntimeException(
-                esc_html__('Failed to generate mcrypt initialization vector.', 'event_espresso')
-            );
-        }
-        // encrypt it
-        $encrypted_text = mcrypt_encrypt(
-            MCRYPT_RIJNDAEL_256,
-            $this->get_encryption_key(),
-            $text_string,
-            MCRYPT_MODE_ECB,
-            $iv
-        );
-        // trim and maybe encode
-        return $this->_use_base64_encode
-            ? trim(base64_encode($encrypted_text))
-            : trim($encrypted_text);
-    }
-
-
-
-    /**
-     * decrypts data that has been encrypted with PHP's mcrypt functions
-     *
-     * @deprecated 4.9.39
-     * @param string $encrypted_text the text to be decrypted
-     * @return string
-     * @throws RuntimeException
-     */
-    protected function m_decrypt($encrypted_text = '')
-    {
-        // you give me nothing??? GET OUT !
-        if (empty($encrypted_text)) {
-            return $encrypted_text;
-        }
-        // decode
-        $encrypted_text = $this->valid_base_64($encrypted_text)
-            ? base64_decode($encrypted_text)
-            : $encrypted_text;
-        // get the initialization vector size
-        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
-        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
-        if ($iv === false) {
-            throw new RuntimeException(
-                esc_html__('Failed to generate mcrypt initialization vector.', 'event_espresso')
-            );
-        }
-        // decrypt it
-        $decrypted_text = mcrypt_decrypt(
-            MCRYPT_RIJNDAEL_256,
-            $this->get_encryption_key(),
-            $encrypted_text,
-            MCRYPT_MODE_ECB,
-            $iv
-        );
-        $decrypted_text = trim($decrypted_text);
-        return $decrypted_text;
-    }
+	/**
+	 * key used for saving the encryption key to the wp_options table
+	 */
+	const ENCRYPTION_OPTION_KEY = 'ee_encryption_key';
+
+	/**
+	 * the OPENSSL cipher method used
+	 */
+	const OPENSSL_CIPHER_METHOD = 'AES-128-CBC';
+
+	/**
+	 * the OPENSSL cipher method used
+	 */
+	const OPENSSL_CIPHER_METHOD_OPTION_NAME = 'ee_openssl_cipher_method';
+
+	/**
+	 * the OPENSSL digest method used
+	 */
+	const OPENSSL_DIGEST_METHOD = 'sha512';
+
+	/**
+	 * separates the encrypted text from the initialization vector
+	 */
+	const OPENSSL_IV_DELIMITER = ':iv:';
+
+	/**
+	 * appended to text encrypted using the acme encryption
+	 */
+	const ACME_ENCRYPTION_FLAG = '::ae';
+
+
+
+	/**
+	 * instance of the EE_Encryption object
+	 */
+	protected static $_instance;
+
+	/**
+	 * @var string $_encryption_key
+	 */
+	protected $_encryption_key;
+
+	/**
+	 * @var string $cipher_method
+	 */
+	private $cipher_method = '';
+
+	/**
+	 * @var array $cipher_methods
+	 */
+	private $cipher_methods = array();
+
+	/**
+	 * @var array $digest_methods
+	 */
+	private $digest_methods = array();
+
+	/**
+	 * @var boolean $_use_openssl_encrypt
+	 */
+	protected $_use_openssl_encrypt = false;
+
+	/**
+	 * @var boolean $_use_mcrypt
+	 */
+	protected $_use_mcrypt = false;
+
+	/**
+	 * @var boolean $_use_base64_encode
+	 */
+	protected $_use_base64_encode = false;
+
+
+
+	/**
+	 * protected constructor to prevent direct creation
+	 */
+	protected function __construct()
+	{
+		if (! defined('ESPRESSO_ENCRYPT')) {
+			define('ESPRESSO_ENCRYPT', true);
+		}
+		if (extension_loaded('openssl')) {
+			$this->_use_openssl_encrypt = true;
+		} else if (extension_loaded('mcrypt')) {
+			$this->_use_mcrypt = true;
+		}
+		if (function_exists('base64_encode')) {
+			$this->_use_base64_encode = true;
+		}
+	}
+
+
+
+	/**
+	 * singleton method used to instantiate class object
+	 *
+	 * @return EE_Encryption
+	 */
+	public static function instance()
+	{
+		// check if class object is instantiated
+		if (! self::$_instance instanceof EE_Encryption) {
+			self::$_instance = new self();
+		}
+		return self::$_instance;
+	}
+
+
+
+	/**
+	 * get encryption key
+	 *
+	 * @return string
+	 */
+	public function get_encryption_key()
+	{
+		// if encryption key has not been set
+		if (empty($this->_encryption_key)) {
+			// retrieve encryption_key from db
+			$this->_encryption_key = get_option(EE_Encryption::ENCRYPTION_OPTION_KEY, '');
+			// WHAT?? No encryption_key in the db ??
+			if ($this->_encryption_key === '') {
+				// let's make one. And md5 it to make it just the right size for a key
+				$new_key = md5($this->generate_random_string());
+				// now save it to the db for later
+				add_option(EE_Encryption::ENCRYPTION_OPTION_KEY, $new_key);
+				// here's the key - FINALLY !
+				$this->_encryption_key = $new_key;
+			}
+		}
+		return $this->_encryption_key;
+	}
+
+
+
+	/**
+	 * encrypts data
+	 *
+	 * @param string $text_string - the text to be encrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	public function encrypt($text_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($text_string)) {
+			return $text_string;
+		}
+		if ($this->_use_openssl_encrypt) {
+			$encrypted_text = $this->openssl_encrypt($text_string);
+		} else {
+			$encrypted_text = $this->acme_encrypt($text_string);
+		}
+		return $encrypted_text;
+	}
+
+
+
+	/**
+	 * decrypts data
+	 *
+	 * @param string $encrypted_text - the text to be decrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	public function decrypt($encrypted_text = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($encrypted_text)) {
+			return $encrypted_text;
+		}
+		// if PHP's mcrypt functions are installed then we'll use them
+		if ($this->_use_openssl_encrypt) {
+			$decrypted_text = $this->openssl_decrypt($encrypted_text);
+		} else {
+			$decrypted_text = $this->acme_decrypt($encrypted_text);
+		}
+		return $decrypted_text;
+	}
+
+
+
+	/**
+	 * encodes string with PHP's base64 encoding
+	 *
+	 * @see http://php.net/manual/en/function.base64-encode.php
+	 * @param string $text_string the text to be encoded
+	 * @return string
+	 */
+	public function base64_string_encode($text_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($text_string) || ! $this->_use_base64_encode) {
+			return $text_string;
+		}
+		// encode
+		return base64_encode($text_string);
+	}
+
+
+
+	/**
+	 * decodes string that has been encoded with PHP's base64 encoding
+	 *
+	 * @see http://php.net/manual/en/function.base64-encode.php
+	 * @param string $encoded_string the text to be decoded
+	 * @return string
+	 */
+	public function base64_string_decode($encoded_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($encoded_string) || ! $this->valid_base_64($encoded_string)) {
+			return $encoded_string;
+		}
+		// decode
+		return base64_decode($encoded_string);
+	}
+
+
+
+	/**
+	 * encodes  url string with PHP's base64 encoding
+	 *
+	 * @see http://php.net/manual/en/function.base64-encode.php
+	 * @param string $text_string the text to be encoded
+	 * @return string
+	 */
+	public function base64_url_encode($text_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($text_string) || ! $this->_use_base64_encode) {
+			return $text_string;
+		}
+		// encode
+		$encoded_string = base64_encode($text_string);
+		// remove chars to make encoding more URL friendly
+		return strtr($encoded_string, '+/=', '-_,');
+	}
+
+
+
+	/**
+	 * decodes  url string that has been encoded with PHP's base64 encoding
+	 *
+	 * @see http://php.net/manual/en/function.base64-encode.php
+	 * @param string $encoded_string the text to be decoded
+	 * @return string
+	 */
+	public function base64_url_decode($encoded_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($encoded_string) || ! $this->valid_base_64($encoded_string)) {
+			return $encoded_string;
+		}
+		// replace previously removed characters
+		$encoded_string = strtr($encoded_string, '-_,', '+/=');
+		// decode
+		return base64_decode($encoded_string);
+	}
+
+
+
+	/**
+	 * encrypts data using PHP's openssl functions
+	 *
+	 * @param string $text_string the text to be encrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function openssl_encrypt($text_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($text_string)) {
+			return $text_string;
+		}
+		$this->cipher_method = $this->getCipherMethod();
+		// get initialization vector size
+		$iv_size = openssl_cipher_iv_length($this->cipher_method);
+		// generate initialization vector.
+		// The second parameter ("crypto_strong") is passed by reference,
+		// and is used to determines if the algorithm used was "cryptographically strong"
+		// openssl_random_pseudo_bytes() will toggle it to either true or false
+		$iv = openssl_random_pseudo_bytes($iv_size, $is_strong);
+		if ($iv === false || $is_strong === false) {
+			throw new RuntimeException(
+				esc_html__('Failed to generate OpenSSL initialization vector.', 'event_espresso')
+			);
+		}
+		// encrypt it
+		$encrypted_text = openssl_encrypt(
+			$text_string,
+			$this->cipher_method,
+			$this->getDigestHashValue(),
+			0,
+			$iv
+		);
+		// append the initialization vector
+		$encrypted_text .= EE_Encryption::OPENSSL_IV_DELIMITER . $iv;
+		// trim and maybe encode
+		return $this->_use_base64_encode
+			? trim(base64_encode($encrypted_text))
+			: trim($encrypted_text);
+	}
+
+
+
+	/**
+	 * Returns a cipher method that has been verified to work.
+	 * First checks if the cached cipher has  been set already and if so, returns that.
+	 * Then tests the incoming default and returns that if it's good.
+	 * If not, then it retrieves the previously tested and saved cipher method.
+	 * But if that doesn't exist, then
+	 *
+	 * @param string $cipher_method
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function getCipherMethod($cipher_method = EE_Encryption::OPENSSL_CIPHER_METHOD)
+	{
+		if($this->cipher_method !== ''){
+			return $this->cipher_method;
+		}
+		// verify that the default cipher method can produce an initialization vector
+		if (openssl_cipher_iv_length($cipher_method) === false) {
+			// nope? okay let's get what we found in the past to work
+			$cipher_method = get_option(EE_Encryption::OPENSSL_CIPHER_METHOD_OPTION_NAME, '');
+			// oops... haven't tested available cipher methods yet
+			if($cipher_method === '') {
+				$cipher_method = $this->getAvailableCipherMethod($cipher_method);
+			}
+		}
+		return $cipher_method;
+	}
+
+
+
+	/**
+	 * @param string $cipher_method
+	 * @return string
+	 * @throws \RuntimeException
+	 */
+	protected function getAvailableCipherMethod($cipher_method)
+	{
+		// verify that the incoming cipher method can produce an initialization vector
+		if (openssl_cipher_iv_length($cipher_method) === false) {
+			// nope? okay then get then check the list of available cipher methods
+			// what? there's no list? then generate that list and cache it,
+			// then rewind the list to the first item, which should match the default
+			if (empty($this->cipher_methods)) {
+				$this->cipher_methods = openssl_get_cipher_methods();
+				reset($this->cipher_methods);
+			}
+			// advance to the next cipher in the list
+			$cipher_method = next($this->cipher_methods);
+			if($cipher_method === false){
+				throw new RuntimeException(
+					esc_html__(
+						'OpenSSL support appears to be enabled on the server, but no cipher methods are available. Please contact the server administrator.',
+						'event_espresso'
+					)
+				);
+			}
+			// verify that the next cipher method works
+			return $this->getAvailableCipherMethod($cipher_method);
+		}
+		// if we've gotten this far, then we found an available cipher method that works
+		// so save that for next time
+		update_option(
+			EE_Encryption::OPENSSL_CIPHER_METHOD_OPTION_NAME,
+			$cipher_method
+		);
+		return $cipher_method;
+	}
+
+
+
+	/**
+	 * decrypts data that has been encrypted with PHP's openssl functions
+	 *
+	 * @param string $encrypted_text the text to be decrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function openssl_decrypt($encrypted_text = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($encrypted_text)) {
+			return $encrypted_text;
+		}
+		// decode
+		$encrypted_text = $this->valid_base_64($encrypted_text)
+			? base64_decode($encrypted_text)
+			: $encrypted_text;
+		$encrypted_components = explode(
+			EE_Encryption::OPENSSL_IV_DELIMITER,
+			$encrypted_text,
+			2
+		);
+		// check that iv exists, and if not, maybe text was encoded using mcrypt?
+		if ($this->_use_mcrypt && ! isset($encrypted_components[1])) {
+			return $this->m_decrypt($encrypted_text);
+		}
+		// decrypt it
+		$decrypted_text = openssl_decrypt(
+			$encrypted_components[0],
+			$this->getCipherMethod(),
+			$this->getDigestHashValue(),
+			0,
+			$encrypted_components[1]
+		);
+		$decrypted_text = trim($decrypted_text);
+		return $decrypted_text;
+	}
+
+
+
+	/**
+	 * Computes the digest hash value using the specified digest method.
+	 * If that digest method fails to produce a valid hash value,
+	 * then we'll grab the next digest method and recursively try again until something works.
+	 *
+	 * @param string $digest_method
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function getDigestHashValue($digest_method = EE_Encryption::OPENSSL_DIGEST_METHOD){
+		$digest_hash_value = openssl_digest($this->get_encryption_key(), $digest_method);
+		if ($digest_hash_value === false) {
+			return $this->getDigestHashValue($this->getDigestMethod());
+		}
+		return $digest_hash_value;
+	}
+
+
+
+	/**
+	 * Returns the NEXT element in the $digest_methods array.
+	 * If the $digest_methods array is empty, then we populate it
+	 * with the available values returned from openssl_get_md_methods().
+	 * But first we will advance to the last element, so that when prev() is called,
+	 * we'll get what was originally the second to last element.
+	 * Why?
+	 * Because the last elements returned by openssl_get_md_methods()
+	 * are typically the newer SHA methods like SHA512, and we want to try them first.
+	 * We've already tried SHA512 as the default set by the OPENSSL_DIGEST_METHOD constant,
+	 * but that will get skipped as soon as prev() is called.
+	 *
+	 * @return string
+	 * @throws \RuntimeException
+	 */
+	protected function getDigestMethod(){
+		if (empty($this->digest_methods)) {
+			$this->digest_methods = openssl_get_md_methods();
+			end($this->digest_methods);
+		}
+		$digest_method = prev($this->digest_methods);
+		if ($digest_method === false) {
+			throw new RuntimeException(
+				esc_html__(
+					'OpenSSL support appears to be enabled on the server, but no digest methods are available. Please contact the server administrator.',
+					'event_espresso'
+				)
+			);
+		}
+		return $digest_method;
+	}
+
+
+	/**
+	 * encrypts data for acme servers that didn't bother to install PHP mcrypt
+	 *
+	 * @see http://stackoverflow.com/questions/800922/how-to-encrypt-string-without-mcrypt-library-in-php
+	 * @param string $text_string the text to be decrypted
+	 * @return string
+	 */
+	protected function acme_encrypt($text_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($text_string)) {
+			return $text_string;
+		}
+		$key_bits = str_split(
+			str_pad(
+				'',
+				strlen($text_string),
+				$this->get_encryption_key(),
+				STR_PAD_RIGHT
+			)
+		);
+		$string_bits = str_split($text_string);
+		foreach ($string_bits as $k => $v) {
+			$temp = ord($v) + ord($key_bits[$k]);
+			$string_bits[$k] = chr($temp > 255 ? ($temp - 256) : $temp);
+		}
+		$encrypted_text = implode('', $string_bits);
+		$encrypted_text .= EE_Encryption::ACME_ENCRYPTION_FLAG;
+		return $this->_use_base64_encode
+			? base64_encode($encrypted_text)
+			: $encrypted_text;
+	}
+
+
+
+	/**
+	 * decrypts data for acme servers that didn't bother to install PHP mcrypt
+	 *
+	 * @see http://stackoverflow.com/questions/800922/how-to-encrypt-string-without-mcrypt-library-in-php
+	 * @param string $encrypted_text the text to be decrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function acme_decrypt($encrypted_text = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($encrypted_text)) {
+			return $encrypted_text;
+		}
+		// decode the data ?
+		$encrypted_text = $this->valid_base_64($encrypted_text)
+			? base64_decode($encrypted_text)
+			: $encrypted_text;
+		if (
+			$this->_use_mcrypt
+			&& strpos($encrypted_text, EE_Encryption::ACME_ENCRYPTION_FLAG) === false
+		){
+			return $this->m_decrypt($encrypted_text);
+		}
+		$encrypted_text = substr($encrypted_text, 0, -4);
+		$key_bits = str_split(
+			str_pad(
+				'',
+				strlen($encrypted_text),
+				$this->get_encryption_key(),
+				STR_PAD_RIGHT
+			)
+		);
+		$string_bits = str_split($encrypted_text);
+		foreach ($string_bits as $k => $v) {
+			$temp = ord($v) - ord($key_bits[$k]);
+			$string_bits[$k] = chr($temp < 0 ? ($temp + 256) : $temp);
+		}
+		return implode('', $string_bits);
+	}
+
+
+
+	/**
+	 * @see http://stackoverflow.com/questions/2556345/detect-base64-encoding-in-php#30231906
+	 * @param $string
+	 * @return bool
+	 */
+	protected function valid_base_64($string)
+	{
+		// ensure data is a string
+		if (! is_string($string) || ! $this->_use_base64_encode) {
+			return false;
+		}
+		$decoded = base64_decode($string, true);
+		// Check if there is no invalid character in string
+		if (! preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $string)) {
+			return false;
+		}
+		// Decode the string in strict mode and send the response
+		if (! base64_decode($string, true)) {
+			return false;
+		}
+		// Encode and compare it to original one
+		return base64_encode($decoded) === $string;
+	}
+
+
+
+	/**
+	 * generate random string
+	 *
+	 * @see http://stackoverflow.com/questions/637278/what-is-the-best-way-to-generate-a-random-key-within-php
+	 * @param int $length number of characters for random string
+	 * @return string
+	 */
+	public function generate_random_string($length = 40)
+	{
+		$iterations = ceil($length / 40);
+		$random_string = '';
+		for ($i = 0; $i < $iterations; $i++) {
+			$random_string .= sha1(microtime(true) . mt_rand(10000, 90000));
+		}
+		$random_string = substr($random_string, 0, $length);
+		return $random_string;
+	}
+
+
+
+	/**
+	 * encrypts data using PHP's mcrypt functions
+	 *
+	 * @deprecated 4.9.39
+	 * @param string $text_string
+	 * @internal   param $string - the text to be encrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function m_encrypt($text_string = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($text_string)) {
+			return $text_string;
+		}
+		// get the initialization vector size
+		$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
+		// initialization vector
+		$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
+		if ($iv === false) {
+			throw new RuntimeException(
+				esc_html__('Failed to generate mcrypt initialization vector.', 'event_espresso')
+			);
+		}
+		// encrypt it
+		$encrypted_text = mcrypt_encrypt(
+			MCRYPT_RIJNDAEL_256,
+			$this->get_encryption_key(),
+			$text_string,
+			MCRYPT_MODE_ECB,
+			$iv
+		);
+		// trim and maybe encode
+		return $this->_use_base64_encode
+			? trim(base64_encode($encrypted_text))
+			: trim($encrypted_text);
+	}
+
+
+
+	/**
+	 * decrypts data that has been encrypted with PHP's mcrypt functions
+	 *
+	 * @deprecated 4.9.39
+	 * @param string $encrypted_text the text to be decrypted
+	 * @return string
+	 * @throws RuntimeException
+	 */
+	protected function m_decrypt($encrypted_text = '')
+	{
+		// you give me nothing??? GET OUT !
+		if (empty($encrypted_text)) {
+			return $encrypted_text;
+		}
+		// decode
+		$encrypted_text = $this->valid_base_64($encrypted_text)
+			? base64_decode($encrypted_text)
+			: $encrypted_text;
+		// get the initialization vector size
+		$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
+		$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
+		if ($iv === false) {
+			throw new RuntimeException(
+				esc_html__('Failed to generate mcrypt initialization vector.', 'event_espresso')
+			);
+		}
+		// decrypt it
+		$decrypted_text = mcrypt_decrypt(
+			MCRYPT_RIJNDAEL_256,
+			$this->get_encryption_key(),
+			$encrypted_text,
+			MCRYPT_MODE_ECB,
+			$iv
+		);
+		$decrypted_text = trim($decrypted_text);
+		return $decrypted_text;
+	}
 
 }
 /* End of file EE_Encryption.class.php */

Spacing +13 added lines, -13 removed lines

@@ -95,7 +95,7 @@ 
      */
     protected function __construct()
     {
-        if (! defined('ESPRESSO_ENCRYPT')) {
+        if ( ! defined('ESPRESSO_ENCRYPT')) {
             define('ESPRESSO_ENCRYPT', true);
         }
         if (extension_loaded('openssl')) {
@@ -118,7 +118,7 @@ 
     public static function instance()
     {
         // check if class object is instantiated
-        if (! self::$_instance instanceof EE_Encryption) {
+        if ( ! self::$_instance instanceof EE_Encryption) {
             self::$_instance = new self();
         }
         return self::$_instance;
@@ -314,7 +314,7 @@ 
             $iv
         );
         // append the initialization vector
-        $encrypted_text .= EE_Encryption::OPENSSL_IV_DELIMITER . $iv;
+        $encrypted_text .= EE_Encryption::OPENSSL_IV_DELIMITER.$iv;
         // trim and maybe encode
         return $this->_use_base64_encode
             ? trim(base64_encode($encrypted_text))
@@ -336,7 +336,7 @@ 
      */
     protected function getCipherMethod($cipher_method = EE_Encryption::OPENSSL_CIPHER_METHOD)
     {
-        if($this->cipher_method !== ''){
+        if ($this->cipher_method !== '') {
             return $this->cipher_method;
         }
         // verify that the default cipher method can produce an initialization vector
@@ -344,7 +344,7 @@ 
             // nope? okay let's get what we found in the past to work
             $cipher_method = get_option(EE_Encryption::OPENSSL_CIPHER_METHOD_OPTION_NAME, '');
             // oops... haven't tested available cipher methods yet
-            if($cipher_method === '') {
+            if ($cipher_method === '') {
                 $cipher_method = $this->getAvailableCipherMethod($cipher_method);
             }
         }
@@ -371,7 +371,7 @@ 
             }
             // advance to the next cipher in the list
             $cipher_method = next($this->cipher_methods);
-            if($cipher_method === false){
+            if ($cipher_method === false) {
                 throw new RuntimeException(
                     esc_html__(
                         'OpenSSL support appears to be enabled on the server, but no cipher methods are available. Please contact the server administrator.',
@@ -442,7 +442,7 @@ 
      * @return string
      * @throws RuntimeException
      */
-    protected function getDigestHashValue($digest_method = EE_Encryption::OPENSSL_DIGEST_METHOD){
+    protected function getDigestHashValue($digest_method = EE_Encryption::OPENSSL_DIGEST_METHOD) {
         $digest_hash_value = openssl_digest($this->get_encryption_key(), $digest_method);
         if ($digest_hash_value === false) {
             return $this->getDigestHashValue($this->getDigestMethod());
@@ -467,7 +467,7 @@ 
      * @return string
      * @throws \RuntimeException
      */
-    protected function getDigestMethod(){
+    protected function getDigestMethod() {
         if (empty($this->digest_methods)) {
             $this->digest_methods = openssl_get_md_methods();
             end($this->digest_methods);
@@ -541,7 +541,7 @@ 
         if (
             $this->_use_mcrypt
             && strpos($encrypted_text, EE_Encryption::ACME_ENCRYPTION_FLAG) === false
-        ){
+        ) {
             return $this->m_decrypt($encrypted_text);
         }
         $encrypted_text = substr($encrypted_text, 0, -4);
@@ -571,16 +571,16 @@ 
     protected function valid_base_64($string)
     {
         // ensure data is a string
-        if (! is_string($string) || ! $this->_use_base64_encode) {
+        if ( ! is_string($string) || ! $this->_use_base64_encode) {
             return false;
         }
         $decoded = base64_decode($string, true);
         // Check if there is no invalid character in string
-        if (! preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $string)) {
+        if ( ! preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $string)) {
             return false;
         }
         // Decode the string in strict mode and send the response
-        if (! base64_decode($string, true)) {
+        if ( ! base64_decode($string, true)) {
             return false;
         }
         // Encode and compare it to original one
@@ -601,7 +601,7 @@ 
         $iterations = ceil($length / 40);
         $random_string = '';
         for ($i = 0; $i < $iterations; $i++) {
-            $random_string .= sha1(microtime(true) . mt_rand(10000, 90000));
+            $random_string .= sha1(microtime(true).mt_rand(10000, 90000));
         }
         $random_string = substr($random_string, 0, $length);
         return $random_string;