Crammd5.php

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<?php
#require_once 'Zend/Mail/Protocol/Smtp.php';


class Zend_Mail_Protocol_Smtp_Auth_Crammd5 extends Zend_Mail_Protocol_Smtp
{
    public function __construct($host = '127.0.0.1', $port = null, $config = null)
    {
        if (is_array($config)) {
            if (isset($config['username'])) {
                $this->_username = $config['username'];
            }
            if (isset($config['password'])) {
                $this->_password = $config['password'];
            }
        }

        parent::__construct($host, $port, $config);
    }


    public function auth()
    {
        // Ensure AUTH has not already been initiated.
        parent::auth();

        $this->_send('AUTH CRAM-MD5');
        $challenge = $this->_expect(334);
        $challenge = base64_decode($challenge);
        $digest = $this->_hmacMd5($this->_password, $challenge);
        $this->_send(base64_encode($this->_username . ' ' . $digest));
        $this->_expect(235);
        $this->_auth = true;
    }


    protected function _hmacMd5($key, $data, $block = 64)
    {
        if (strlen($key) > 64) {
            $key = pack('H32', md5($key));
        } elseif (strlen($key) < 64) {
            $key = str_pad($key, $block, "\0");
        }

        $k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
        $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);

        $inner = pack('H32', md5($k_ipad . $data));
        $digest = md5($k_opad . $inner);

        return $digest;
    }
}