<h2>File Contents: /home/planet5/www/wp-content/plugins/google-site-kit/third-party/firebase/php-jwt/src/JWT.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/www/wp-content/plugins/google-site-kit/third-party/firebase/php-jwt/src/JWT.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php

namespace Google\Site_Kit_Dependencies\Firebase\JWT;

use ArrayAccess;
use DateTime;
use DomainException;
use Exception;
use InvalidArgumentException;
use OpenSSLAsymmetricKey;
use OpenSSLCertificate;
use stdClass;
use UnexpectedValueException;
/**
 * JSON Web Token implementation, based on this spec:
 * https://tools.ietf.org/html/rfc7519
 *
 * PHP version 5
 *
 * @category Authentication
 * @package  Authentication_JWT
 * @author   Neuman Vong &lt;neuman@twilio.com&gt;
 * @author   Anant Narayanan &lt;anant@php.net&gt;
 * @license  http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
 * @link     https://github.com/firebase/php-jwt
 */
class JWT
{
    private const ASN1_INTEGER = 0x2;
    private const ASN1_SEQUENCE = 0x10;
    private const ASN1_BIT_STRING = 0x3;
    /**
     * When checking nbf, iat or expiration times,
     * we want to provide some extra leeway time to
     * account for clock skew.
     *
     * @var int
     */
    public static $leeway = 0;
    /**
     * Allow the current timestamp to be specified.
     * Useful for fixing a value within unit testing.
     * Will default to PHP time() value if null.
     *
     * @var ?int
     */
    public static $timestamp = null;
    /**
     * @var array&lt;string, string[]&gt;
     */
    public static $supported_algs = [&#039;ES384&#039; =&gt; [&#039;openssl&#039;, &#039;SHA384&#039;], &#039;ES256&#039; =&gt; [&#039;openssl&#039;, &#039;SHA256&#039;], &#039;ES256K&#039; =&gt; [&#039;openssl&#039;, &#039;SHA256&#039;], &#039;HS256&#039; =&gt; [&#039;hash_hmac&#039;, &#039;SHA256&#039;], &#039;HS384&#039; =&gt; [&#039;hash_hmac&#039;, &#039;SHA384&#039;], &#039;HS512&#039; =&gt; [&#039;hash_hmac&#039;, &#039;SHA512&#039;], &#039;RS256&#039; =&gt; [&#039;openssl&#039;, &#039;SHA256&#039;], &#039;RS384&#039; =&gt; [&#039;openssl&#039;, &#039;SHA384&#039;], &#039;RS512&#039; =&gt; [&#039;openssl&#039;, &#039;SHA512&#039;], &#039;EdDSA&#039; =&gt; [&#039;sodium_crypto&#039;, &#039;EdDSA&#039;]];
    /**
     * Decodes a JWT string into a PHP object.
     *
     * @param string                 $jwt            The JWT
     * @param Key|ArrayAccess&lt;string,Key&gt;|array&lt;string,Key&gt; $keyOrKeyArray  The Key or associative array of key IDs
     *                                                                      (kid) to Key objects.
     *                                                                      If the algorithm used is asymmetric, this is
     *                                                                      the public key.
     *                                                                      Each Key object contains an algorithm and
     *                                                                      matching key.
     *                                                                      Supported algorithms are &#039;ES384&#039;,&#039;ES256&#039;,
     *                                                                      &#039;HS256&#039;, &#039;HS384&#039;, &#039;HS512&#039;, &#039;RS256&#039;, &#039;RS384&#039;
     *                                                                      and &#039;RS512&#039;.
     * @param stdClass               $headers                               Optional. Populates stdClass with headers.
     *
     * @return stdClass The JWT&#039;s payload as a PHP object
     *
     * @throws InvalidArgumentException     Provided key/key-array was empty or malformed
     * @throws DomainException              Provided JWT is malformed
     * @throws UnexpectedValueException     Provided JWT was invalid
     * @throws SignatureInvalidException    Provided JWT was invalid because the signature verification failed
     * @throws BeforeValidException         Provided JWT is trying to be used before it&#039;s eligible as defined by &#039;nbf&#039;
     * @throws BeforeValidException         Provided JWT is trying to be used before it&#039;s been created as defined by &#039;iat&#039;
     * @throws ExpiredException             Provided JWT has since expired, as defined by the &#039;exp&#039; claim
     *
     * @uses jsonDecode
     * @uses urlsafeB64Decode
     */
    public static function decode(string $jwt, $keyOrKeyArray, stdClass &amp;$headers = null): stdClass
    {
        // Validate JWT
        $timestamp = \is_null(static::$timestamp) ? \time() : static::$timestamp;
        if (empty($keyOrKeyArray)) {
            throw new InvalidArgumentException(&#039;Key may not be empty&#039;);
        }
        $tks = \explode(&#039;.&#039;, $jwt);
        if (\count($tks) !== 3) {
            throw new UnexpectedValueException(&#039;Wrong number of segments&#039;);
        }
        list($headb64, $bodyb64, $cryptob64) = $tks;
        $headerRaw = static::urlsafeB64Decode($headb64);
        if (null === $header = static::jsonDecode($headerRaw)) {
            throw new UnexpectedValueException(&#039;Invalid header encoding&#039;);
        }
        if ($headers !== null) {
            $headers = $header;
        }
        $payloadRaw = static::urlsafeB64Decode($bodyb64);
        if (null === $payload = static::jsonDecode($payloadRaw)) {
            throw new UnexpectedValueException(&#039;Invalid claims encoding&#039;);
        }
        if (\is_array($payload)) {
            // prevent PHP Fatal Error in edge-cases when payload is empty array
            $payload = (object) $payload;
        }
        if (!$payload instanceof stdClass) {
            throw new UnexpectedValueException(&#039;Payload must be a JSON object&#039;);
        }
        $sig = static::urlsafeB64Decode($cryptob64);
        if (empty($header-&gt;alg)) {
            throw new UnexpectedValueException(&#039;Empty algorithm&#039;);
        }
        if (empty(static::$supported_algs[$header-&gt;alg])) {
            throw new UnexpectedValueException(&#039;Algorithm not supported&#039;);
        }
        $key = self::getKey($keyOrKeyArray, property_exists($header, &#039;kid&#039;) ? $header-&gt;kid : null);
        // Check the algorithm
        if (!self::constantTimeEquals($key-&gt;getAlgorithm(), $header-&gt;alg)) {
            // See issue #351
            throw new UnexpectedValueException(&#039;Incorrect key for this algorithm&#039;);
        }
        if (\in_array($header-&gt;alg, [&#039;ES256&#039;, &#039;ES256K&#039;, &#039;ES384&#039;], \true)) {
            // OpenSSL expects an ASN.1 DER sequence for ES256/ES256K/ES384 signatures
            $sig = self::signatureToDER($sig);
        }
        if (!self::verify(&quot;{$headb64}.{$bodyb64}&quot;, $sig, $key-&gt;getKeyMaterial(), $header-&gt;alg)) {
            throw new SignatureInvalidException(&#039;Signature verification failed&#039;);
        }
        // Check the nbf if it is defined. This is the time that the
        // token can actually be used. If it&#039;s not yet that time, abort.
        if (isset($payload-&gt;nbf) &amp;&amp; floor($payload-&gt;nbf) &gt; $timestamp + static::$leeway) {
            $ex = new BeforeValidException(&#039;Cannot handle token with nbf prior to &#039; . \date(DateTime::ISO8601, (int) $payload-&gt;nbf));
            $ex-&gt;setPayload($payload);
            throw $ex;
        }
        // Check that this token has been created before &#039;now&#039;. This prevents
        // using tokens that have been created for later use (and haven&#039;t
        // correctly used the nbf claim).
        if (!isset($payload-&gt;nbf) &amp;&amp; isset($payload-&gt;iat) &amp;&amp; floor($payload-&gt;iat) &gt; $timestamp + static::$leeway) {
            $ex = new BeforeValidException(&#039;Cannot handle token with iat prior to &#039; . \date(DateTime::ISO8601, (int) $payload-&gt;iat));
            $ex-&gt;setPayload($payload);
            throw $ex;
        }
        // Check if this token has expired.
        if (isset($payload-&gt;exp) &amp;&amp; $timestamp - static::$leeway &gt;= $payload-&gt;exp) {
            $ex = new ExpiredException(&#039;Expired token&#039;);
            $ex-&gt;setPayload($payload);
            throw $ex;
        }
        return $payload;
    }
    /**
     * Converts and signs a PHP array into a JWT string.
     *
     * @param array&lt;mixed&gt;          $payload PHP array
     * @param string|resource|OpenSSLAsymmetricKey|OpenSSLCertificate $key The secret key.
     * @param string                $alg     Supported algorithms are &#039;ES384&#039;,&#039;ES256&#039;, &#039;ES256K&#039;, &#039;HS256&#039;,
     *                                       &#039;HS384&#039;, &#039;HS512&#039;, &#039;RS256&#039;, &#039;RS384&#039;, and &#039;RS512&#039;
     * @param string                $keyId
     * @param array&lt;string, string&gt; $head    An array with header elements to attach
     *
     * @return string A signed JWT
     *
     * @uses jsonEncode
     * @uses urlsafeB64Encode
     */
    public static function encode(array $payload, $key, string $alg, string $keyId = null, array $head = null): string
    {
        $header = [&#039;typ&#039; =&gt; &#039;JWT&#039;];
        if (isset($head) &amp;&amp; \is_array($head)) {
            $header = \array_merge($header, $head);
        }
        $header[&#039;alg&#039;] = $alg;
        if ($keyId !== null) {
            $header[&#039;kid&#039;] = $keyId;
        }
        $segments = [];
        $segments[] = static::urlsafeB64Encode((string) static::jsonEncode($header));
        $segments[] = static::urlsafeB64Encode((string) static::jsonEncode($payload));
        $signing_input = \implode(&#039;.&#039;, $segments);
        $signature = static::sign($signing_input, $key, $alg);
        $segments[] = static::urlsafeB64Encode($signature);
        return \implode(&#039;.&#039;, $segments);
    }
    /**
     * Sign a string with a given key and algorithm.
     *
     * @param string $msg  The message to sign
     * @param string|resource|OpenSSLAsymmetricKey|OpenSSLCertificate  $key  The secret key.
     * @param string $alg  Supported algorithms are &#039;EdDSA&#039;, &#039;ES384&#039;, &#039;ES256&#039;, &#039;ES256K&#039;, &#039;HS256&#039;,
     *                    &#039;HS384&#039;, &#039;HS512&#039;, &#039;RS256&#039;, &#039;RS384&#039;, and &#039;RS512&#039;
     *
     * @return string An encrypted message
     *
     * @throws DomainException Unsupported algorithm or bad key was specified
     */
    public static function sign(string $msg, $key, string $alg): string
    {
        if (empty(static::$supported_algs[$alg])) {
            throw new DomainException(&#039;Algorithm not supported&#039;);
        }
        list($function, $algorithm) = static::$supported_algs[$alg];
        switch ($function) {
            case &#039;hash_hmac&#039;:
                if (!\is_string($key)) {
                    throw new InvalidArgumentException(&#039;key must be a string when using hmac&#039;);
                }
                return \hash_hmac($algorithm, $msg, $key, \true);
            case &#039;openssl&#039;:
                $signature = &#039;&#039;;
                $success = \openssl_sign($msg, $signature, $key, $algorithm);
                // @phpstan-ignore-line
                if (!$success) {
                    throw new DomainException(&#039;OpenSSL unable to sign data&#039;);
                }
                if ($alg === &#039;ES256&#039; || $alg === &#039;ES256K&#039;) {
                    $signature = self::signatureFromDER($signature, 256);
                } elseif ($alg === &#039;ES384&#039;) {
                    $signature = self::signatureFromDER($signature, 384);
                }
                return $signature;
            case &#039;sodium_crypto&#039;:
                if (!\function_exists(&#039;sodium_crypto_sign_detached&#039;) &amp;&amp; !\function_exists(&#039;Google\Site_Kit_Dependencies\sodium_crypto_sign_detached&#039;)) {
                    throw new DomainException(&#039;libsodium is not available&#039;);
                }
                if (!\is_string($key)) {
                    throw new InvalidArgumentException(&#039;key must be a string when using EdDSA&#039;);
                }
                try {
                    // The last non-empty line is used as the key.
                    $lines = array_filter(explode(&quot;\n&quot;, $key));
                    $key = base64_decode((string) end($lines));
                    if (\strlen($key) === 0) {
                        throw new DomainException(&#039;Key cannot be empty string&#039;);
                    }
                    return sodium_crypto_sign_detached($msg, $key);
                } catch (Exception $e) {
                    throw new DomainException($e-&gt;getMessage(), 0, $e);
                }
        }
        throw new DomainException(&#039;Algorithm not supported&#039;);
    }
    /**
     * Verify a signature with the message, key and method. Not all methods
     * are symmetric, so we must have a separate verify and sign method.
     *
     * @param string $msg         The original message (header and body)
     * @param string $signature   The original signature
     * @param string|resource|OpenSSLAsymmetricKey|OpenSSLCertificate  $keyMaterial For Ed*, ES*, HS*, a string key works. for RS*, must be an instance of OpenSSLAsymmetricKey
     * @param string $alg         The algorithm
     *
     * @return bool
     *
     * @throws DomainException Invalid Algorithm, bad key, or OpenSSL failure
     */
    private static function verify(string $msg, string $signature, $keyMaterial, string $alg): bool
    {
        if (empty(static::$supported_algs[$alg])) {
            throw new DomainException(&#039;Algorithm not supported&#039;);
        }
        list($function, $algorithm) = static::$supported_algs[$alg];
        switch ($function) {
            case &#039;openssl&#039;:
                $success = \openssl_verify($msg, $signature, $keyMaterial, $algorithm);
                // @phpstan-ignore-line
                if ($success === 1) {
                    return \true;
                }
                if ($success === 0) {
                    return \false;
                }
                // returns 1 on success, 0 on failure, -1 on error.
                throw new DomainException(&#039;OpenSSL error: &#039; . \openssl_error_string());
            case &#039;sodium_crypto&#039;:
                if (!\function_exists(&#039;sodium_crypto_sign_verify_detached&#039;) &amp;&amp; !\function_exists(&#039;Google\Site_Kit_Dependencies\sodium_crypto_sign_verify_detached&#039;)) {
                    throw new DomainException(&#039;libsodium is not available&#039;);
                }
                if (!\is_string($keyMaterial)) {
                    throw new InvalidArgumentException(&#039;key must be a string when using EdDSA&#039;);
                }
                try {
                    // The last non-empty line is used as the key.
                    $lines = array_filter(explode(&quot;\n&quot;, $keyMaterial));
                    $key = base64_decode((string) end($lines));
                    if (\strlen($key) === 0) {
                        throw new DomainException(&#039;Key cannot be empty string&#039;);
                    }
                    if (\strlen($signature) === 0) {
                        throw new DomainException(&#039;Signature cannot be empty string&#039;);
                    }
                    return sodium_crypto_sign_verify_detached($signature, $msg, $key);
                } catch (Exception $e) {
                    throw new DomainException($e-&gt;getMessage(), 0, $e);
                }
            case &#039;hash_hmac&#039;:
            default:
                if (!\is_string($keyMaterial)) {
                    throw new InvalidArgumentException(&#039;key must be a string when using hmac&#039;);
                }
                $hash = \hash_hmac($algorithm, $msg, $keyMaterial, \true);
                return self::constantTimeEquals($hash, $signature);
        }
    }
    /**
     * Decode a JSON string into a PHP object.
     *
     * @param string $input JSON string
     *
     * @return mixed The decoded JSON string
     *
     * @throws DomainException Provided string was invalid JSON
     */
    public static function jsonDecode(string $input)
    {
        $obj = \json_decode($input, \false, 512, \JSON_BIGINT_AS_STRING);
        if ($errno = \json_last_error()) {
            self::handleJsonError($errno);
        } elseif ($obj === null &amp;&amp; $input !== &#039;null&#039;) {
            throw new DomainException(&#039;Null result with non-null input&#039;);
        }
        return $obj;
    }
    /**
     * Encode a PHP array into a JSON string.
     *
     * @param array&lt;mixed&gt; $input A PHP array
     *
     * @return string JSON representation of the PHP array
     *
     * @throws DomainException Provided object could not be encoded to valid JSON
     */
    public static function jsonEncode(array $input): string
    {
        if (\PHP_VERSION_ID &gt;= 50400) {
            $json = \json_encode($input, \JSON_UNESCAPED_SLASHES);
        } else {
            // PHP 5.3 only
            $json = \json_encode($input);
        }
        if ($errno = \json_last_error()) {
            self::handleJsonError($errno);
        } elseif ($json === &#039;null&#039;) {
            throw new DomainException(&#039;Null result with non-null input&#039;);
        }
        if ($json === \false) {
            throw new DomainException(&#039;Provided object could not be encoded to valid JSON&#039;);
        }
        return $json;
    }
    /**
     * Decode a string with URL-safe Base64.
     *
     * @param string $input A Base64 encoded string
     *
     * @return string A decoded string
     *
     * @throws InvalidArgumentException invalid base64 characters
     */
    public static function urlsafeB64Decode(string $input): string
    {
        return \base64_decode(self::convertBase64UrlToBase64($input));
    }
    /**
     * Convert a string in the base64url (URL-safe Base64) encoding to standard base64.
     *
     * @param string $input A Base64 encoded string with URL-safe characters (-_ and no padding)
     *
     * @return string A Base64 encoded string with standard characters (+/) and padding (=), when
     * needed.
     *
     * @see https://www.rfc-editor.org/rfc/rfc4648
     */
    public static function convertBase64UrlToBase64(string $input): string
    {
        $remainder = \strlen($input) % 4;
        if ($remainder) {
            $padlen = 4 - $remainder;
            $input .= \str_repeat(&#039;=&#039;, $padlen);
        }
        return \strtr($input, &#039;-_&#039;, &#039;+/&#039;);
    }
    /**
     * Encode a string with URL-safe Base64.
     *
     * @param string $input The string you want encoded
     *
     * @return string The base64 encode of what you passed in
     */
    public static function urlsafeB64Encode(string $input): string
    {
        return \str_replace(&#039;=&#039;, &#039;&#039;, \strtr(\base64_encode($input), &#039;+/&#039;, &#039;-_&#039;));
    }
    /**
     * Determine if an algorithm has been provided for each Key
     *
     * @param Key|ArrayAccess&lt;string,Key&gt;|array&lt;string,Key&gt; $keyOrKeyArray
     * @param string|null            $kid
     *
     * @throws UnexpectedValueException
     *
     * @return Key
     */
    private static function getKey($keyOrKeyArray, ?string $kid): Key
    {
        if ($keyOrKeyArray instanceof Key) {
            return $keyOrKeyArray;
        }
        if (empty($kid) &amp;&amp; $kid !== &#039;0&#039;) {
            throw new UnexpectedValueException(&#039;&quot;kid&quot; empty, unable to lookup correct key&#039;);
        }
        if ($keyOrKeyArray instanceof CachedKeySet) {
            // Skip &quot;isset&quot; check, as this will automatically refresh if not set
            return $keyOrKeyArray[$kid];
        }
        if (!isset($keyOrKeyArray[$kid])) {
            throw new UnexpectedValueException(&#039;&quot;kid&quot; invalid, unable to lookup correct key&#039;);
        }
        return $keyOrKeyArray[$kid];
    }
    /**
     * @param string $left  The string of known length to compare against
     * @param string $right The user-supplied string
     * @return bool
     */
    public static function constantTimeEquals(string $left, string $right): bool
    {
        if (\function_exists(&#039;hash_equals&#039;)) {
            return \hash_equals($left, $right);
        }
        $len = \min(self::safeStrlen($left), self::safeStrlen($right));
        $status = 0;
        for ($i = 0; $i &lt; $len; $i++) {
            $status |= \ord($left[$i]) ^ \ord($right[$i]);
        }
        $status |= self::safeStrlen($left) ^ self::safeStrlen($right);
        return $status === 0;
    }
    /**
     * Helper method to create a JSON error.
     *
     * @param int $errno An error number from json_last_error()
     *
     * @throws DomainException
     *
     * @return void
     */
    private static function handleJsonError(int $errno): void
    {
        $messages = [\JSON_ERROR_DEPTH =&gt; &#039;Maximum stack depth exceeded&#039;, \JSON_ERROR_STATE_MISMATCH =&gt; &#039;Invalid or malformed JSON&#039;, \JSON_ERROR_CTRL_CHAR =&gt; &#039;Unexpected control character found&#039;, \JSON_ERROR_SYNTAX =&gt; &#039;Syntax error, malformed JSON&#039;, \JSON_ERROR_UTF8 =&gt; &#039;Malformed UTF-8 characters&#039;];
        throw new DomainException(isset($messages[$errno]) ? $messages[$errno] : &#039;Unknown JSON error: &#039; . $errno);
    }
    /**
     * Get the number of bytes in cryptographic strings.
     *
     * @param string $str
     *
     * @return int
     */
    private static function safeStrlen(string $str): int
    {
        if (\function_exists(&#039;mb_strlen&#039;)) {
            return \mb_strlen($str, &#039;8bit&#039;);
        }
        return \strlen($str);
    }
    /**
     * Convert an ECDSA signature to an ASN.1 DER sequence
     *
     * @param   string $sig The ECDSA signature to convert
     * @return  string The encoded DER object
     */
    private static function signatureToDER(string $sig): string
    {
        // Separate the signature into r-value and s-value
        $length = max(1, (int) (\strlen($sig) / 2));
        list($r, $s) = \str_split($sig, $length);
        // Trim leading zeros
        $r = \ltrim($r, &quot;\x00&quot;);
        $s = \ltrim($s, &quot;\x00&quot;);
        // Convert r-value and s-value from unsigned big-endian integers to
        // signed two&#039;s complement
        if (\ord($r[0]) &gt; 0x7f) {
            $r = &quot;\x00&quot; . $r;
        }
        if (\ord($s[0]) &gt; 0x7f) {
            $s = &quot;\x00&quot; . $s;
        }
        return self::encodeDER(self::ASN1_SEQUENCE, self::encodeDER(self::ASN1_INTEGER, $r) . self::encodeDER(self::ASN1_INTEGER, $s));
    }
    /**
     * Encodes a value into a DER object.
     *
     * @param   int     $type DER tag
     * @param   string  $value the value to encode
     *
     * @return  string  the encoded object
     */
    private static function encodeDER(int $type, string $value): string
    {
        $tag_header = 0;
        if ($type === self::ASN1_SEQUENCE) {
            $tag_header |= 0x20;
        }
        // Type
        $der = \chr($tag_header | $type);
        // Length
        $der .= \chr(\strlen($value));
        return $der . $value;
    }
    /**
     * Encodes signature from a DER object.
     *
     * @param   string  $der binary signature in DER format
     * @param   int     $keySize the number of bits in the key
     *
     * @return  string  the signature
     */
    private static function signatureFromDER(string $der, int $keySize): string
    {
        // OpenSSL returns the ECDSA signatures as a binary ASN.1 DER SEQUENCE
        list($offset, $_) = self::readDER($der);
        list($offset, $r) = self::readDER($der, $offset);
        list($offset, $s) = self::readDER($der, $offset);
        // Convert r-value and s-value from signed two&#039;s compliment to unsigned
        // big-endian integers
        $r = \ltrim($r, &quot;\x00&quot;);
        $s = \ltrim($s, &quot;\x00&quot;);
        // Pad out r and s so that they are $keySize bits long
        $r = \str_pad($r, $keySize / 8, &quot;\x00&quot;, \STR_PAD_LEFT);
        $s = \str_pad($s, $keySize / 8, &quot;\x00&quot;, \STR_PAD_LEFT);
        return $r . $s;
    }
    /**
     * Reads binary DER-encoded data and decodes into a single object
     *
     * @param string $der the binary data in DER format
     * @param int $offset the offset of the data stream containing the object
     * to decode
     *
     * @return array{int, string|null} the new offset and the decoded object
     */
    private static function readDER(string $der, int $offset = 0): array
    {
        $pos = $offset;
        $size = \strlen($der);
        $constructed = \ord($der[$pos]) &gt;&gt; 5 &amp; 0x1;
        $type = \ord($der[$pos++]) &amp; 0x1f;
        // Length
        $len = \ord($der[$pos++]);
        if ($len &amp; 0x80) {
            $n = $len &amp; 0x1f;
            $len = 0;
            while ($n-- &amp;&amp; $pos &lt; $size) {
                $len = $len &lt;&lt; 8 | \ord($der[$pos++]);
            }
        }
        // Value
        if ($type === self::ASN1_BIT_STRING) {
            $pos++;
            // Skip the first contents octet (padding indicator)
            $data = \substr($der, $pos, $len - 1);
            $pos += $len - 1;
        } elseif (!$constructed) {
            $data = \substr($der, $pos, $len);
            $pos += $len;
        } else {
            $data = null;
        }
        return [$pos, $data];
    }
}
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