Key.php

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<?php
class Zend_Crypt_Rsa_Key implements Countable
{
    protected $_pemString = null;

    protected $_details = array();

    protected $_opensslKeyResource = null;

    public function getOpensslKeyResource()
    {
        return $this->_opensslKeyResource;
    }

    public function toString()
    {
        if (!empty($this->_pemString)) {
            return $this->_pemString;
        } elseif (!empty($this->_certificateString)) {
            return $this->_certificateString;
        }
        #require_once 'Zend/Crypt/Exception.php';
        throw new Zend_Crypt_Exception('No public key string representation is available');
    }

    public function __toString()
    {
        return $this->toString();
    }

    public function count()
    {
        return $this->_details['bits'];
    }

    public function getType()
    {
        return $this->_details['type'];
    }
}