smtp_class::digest_md5 PHP Méthode

    function digest_md5($username, $password)
    {
        global $config, $user;
        $this->server_send('AUTH DIGEST-MD5');
        if ($err_msg = $this->server_parse('334', __LINE__)) {
            return $this->numeric_response_code == 503 ? false : $err_msg;
        }
        $md5_challenge = base64_decode($this->responses[0]);
        // Parse the md5 challenge - from AUTH_SASL (PEAR)
        $tokens = array();
        while (preg_match('/^([a-z-]+)=("[^"]+(?<!\\\\)"|[^,]+)/i', $md5_challenge, $matches)) {
            // Ignore these as per rfc2831
            if ($matches[1] == 'opaque' || $matches[1] == 'domain') {
                $md5_challenge = substr($md5_challenge, strlen($matches[0]) + 1);
                continue;
            }
            // Allowed multiple "realm" and "auth-param"
            if (!empty($tokens[$matches[1]]) && ($matches[1] == 'realm' || $matches[1] == 'auth-param')) {
                if (is_array($tokens[$matches[1]])) {
                    $tokens[$matches[1]][] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
                } else {
                    $tokens[$matches[1]] = array($tokens[$matches[1]], preg_replace('/^"(.*)"$/', '\\1', $matches[2]));
                }
            } else {
                if (!empty($tokens[$matches[1]])) {
                    $tokens = array();
                    break;
                } else {
                    $tokens[$matches[1]] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
                }
            }
            // Remove the just parsed directive from the challenge
            $md5_challenge = substr($md5_challenge, strlen($matches[0]) + 1);
        }
        // Realm
        if (empty($tokens['realm'])) {
            $tokens['realm'] = function_exists('php_uname') ? php_uname('n') : $user->host;
        }
        // Maxbuf
        if (empty($tokens['maxbuf'])) {
            $tokens['maxbuf'] = 65536;
        }
        // Required: nonce, algorithm
        if (empty($tokens['nonce']) || empty($tokens['algorithm'])) {
            $tokens = array();
        }
        $md5_challenge = $tokens;
        if (!empty($md5_challenge)) {
            $str = '';
            for ($i = 0; $i < 32; $i++) {
                $str .= chr(mt_rand(0, 255));
            }
            $cnonce = base64_encode($str);
            $digest_uri = 'smtp/' . $config['smtp_host'];
            $auth_1 = sprintf('%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $username, $md5_challenge['realm'], $password))), $md5_challenge['nonce'], $cnonce);
            $auth_2 = 'AUTHENTICATE:' . $digest_uri;
            $response_value = md5(sprintf('%s:%s:00000001:%s:auth:%s', md5($auth_1), $md5_challenge['nonce'], $cnonce, md5($auth_2)));
            $input_string = sprintf('username="%s",realm="%s",nonce="%s",cnonce="%s",nc="00000001",qop=auth,digest-uri="%s",response=%s,%d', $username, $md5_challenge['realm'], $md5_challenge['nonce'], $cnonce, $digest_uri, $response_value, $md5_challenge['maxbuf']);
        } else {
            return isset($user->lang['INVALID_DIGEST_CHALLENGE']) ? $user->lang['INVALID_DIGEST_CHALLENGE'] : 'Invalid digest challenge';
        }
        $base64_method_digest_md5 = base64_encode($input_string);
        $this->server_send($base64_method_digest_md5, true);
        if ($err_msg = $this->server_parse('334', __LINE__)) {
            return $err_msg;
        }
        $this->server_send(' ');
        if ($err_msg = $this->server_parse('235', __LINE__)) {
            return $err_msg;
        }
        return false;
    }