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<?php
/**
* LightPHP Framework
* LitePHP is a framework that has been designed to be lite waight, extensible and fast.
*
* @author Robert Pitt <robertpitt1988@gmail.com>
* @category core
* @copyright 2013 Robert Pitt
* @license GPL v3 - GNU Public License v3
* @version 1.0.0
*/
/**
* Bcrypt class
*
* This class is based on: https://github.com/cosenary/Bcrypt-PHP-Class
*/
class Bcrypt_Library
{
/**
* Work cost factor
* range between 04-31
*
* @var string
*/
private$_workFactor = 8;
/**
* All valid hash identifiers
*
* @var array
*/
private$_validIdentifiers = array ('2a', '2x', '2y');
/**
* Constructor
*/
publicfunction__construct()
{
/**
* Validate the PHP Version is sufficient.
*/
if (version_compare(PHP_VERSION, '5.3') < 0)
{
thrownewException('Bcrypt requires PHP 5.3 or above');
}
/**
* Validate OpenSSL is installed for php.
*/
if (!function_exists('openssl_random_pseudo_bytes'))
{
thrownewException('PHP OpenSSL Library is missing.');
}
}
/**
* Hash password
*
* @param string $password
* @param integer $workFactor
* @return string
*/
publicfunctionencrypt($password, $workFactor = 0, $identifier = '2y')
{
/**
* Return the hash
*/
returncrypt($password, $this->_genSalt($workFactor, $identifier));
}
/**
* Check bcrypt password
*
* @param string $password
* @param string $storedHash
* @return boolean
*/
publicfunctionvalidate($password, $storedHash)
{
/**
* Validate the identifier
*/
try {
$this->_validateIdentifier($storedHash);
}catch(Exception$e)
{
returnfalse;
}
/**
* Validate
*/
return (crypt($password, $storedHash) === $storedHash);
}
privatefunction_genSalt($workFactor, $identifier = '2y')
{
if ($workFactor < 4 || $workFactor > 31)
{
$workFactor = $this->_workFactor;
}
/**
* Generate some random bytes
* @var string
*/
$input = $this->_getRandomBytes();
/**
* Begin the salt with hte initial hash identifier
* @var string
*/
$salt = '$' . $identifier . '$';
/**
* Append the work factor to the hash
*/
$salt .= str_pad($workFactor, 2, '0', STR_PAD_LEFT) . '$';
/**
* Return the salt.
*/
return$salt . substr(strtr(base64_encode($input), '+', '.'), 0, 22);
}
/**
* OpenSSL's random generator
*
* @return string
*/
privatefunction_getRandomBytes()
{
returnopenssl_random_pseudo_bytes(16);
}
/**
* Validate Identifier
* @param string $hash
* @return void
*/
privatefunction_validateIdentifier($hash)
{
if (!in_array(substr($hash, 1, 2), $this->_validIdentifiers))
{
thrownewException('Unsupported hash format.');
}
}
}