src/Biz/Util/Phpsec/File/ASN1.php

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<?php

/**
 * Pure-PHP ASN.1 Parser.
 *
 * PHP version 5
 *
 * ASN.1 provides the semantics for data encoded using various schemes.  The most commonly
 * utilized scheme is DER or the "Distinguished Encoding Rules".  PEM's are base64 encoded
 * DER blobs.
 *
 * \Biz\Util\Phpsec\File\ASN1 decodes and encodes DER formatted messages and places them in a semantic context.
 *
 * Uses the 1988 ASN.1 syntax.
 *
 * @category  File
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2012 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 *
 * @see      http://phpseclib.sourceforge.net
 */

namespace Biz\Util\Phpsec\File;

use Biz\Util\Phpsec\Math\BigInteger;
use Biz\Util\Phpsec\File\ASN1\Element;

/**
 * Pure-PHP ASN.1 Parser.
 *
 *
 * @author  Jim Wigginton <terrafrost@php.net>
 */
class ASN1
{
    /**#@+
     * Tag Classes
     *
     * @access private
     * @link http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=12
     */
    const CLASS_UNIVERSAL = 0;
    const CLASS_APPLICATION = 1;
    const CLASS_CONTEXT_SPECIFIC = 2;
    const CLASS_PRIVATE = 3;
    /**#@-*/

    /**#@+
     * Tag Classes
     *
     * @access private
     * @link http://www.obj-sys.com/asn1tutorial/node124.html
     */
    const TYPE_BOOLEAN = 1;
    const TYPE_INTEGER = 2;
    const TYPE_BIT_STRING = 3;
    const TYPE_OCTET_STRING = 4;
    const TYPE_NULL = 5;