deleted file mode 100644

@@ -1,512 +0,0 @@

-<?php

-

-namespace Firebase\JWT;

-

-use \DomainException;

-use \InvalidArgumentException;

-use \UnexpectedValueException;

-use \DateTime;

-

-/**

- * 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 <neuman@twilio.com>

- * @author   Anant Narayanan <anant@php.net>

- * @license  http://opensource.org/licenses/BSD-3-Clause 3-clause BSD

- * @link     https://github.com/firebase/php-jwt

- */

-class JWT

-{

-    const ASN1_INTEGER = 0x02;

-    const ASN1_SEQUENCE = 0x10;

-    const ASN1_BIT_STRING = 0x03;

-

-    /**

-     * When checking nbf, iat or expiration times,

-     * we want to provide some extra leeway time to

-     * account for clock skew.

-     */

-    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.

-     */

-    public static $timestamp = null;

-

-    public static $supported_algs = array(

-        'ES256' => array('openssl', 'SHA256'),

-        'HS256' => array('hash_hmac', 'SHA256'),

-        'HS384' => array('hash_hmac', 'SHA384'),

-        'HS512' => array('hash_hmac', 'SHA512'),

-        'RS256' => array('openssl', 'SHA256'),

-        'RS384' => array('openssl', 'SHA384'),

-        'RS512' => array('openssl', 'SHA512'),

-    );

-

-    /**

-     * Decodes a JWT string into a PHP object.

-     *

-     * @param string                    $jwt            The JWT

-     * @param string|array|resource     $key            The key, or map of keys.

-     *                                                  If the algorithm used is asymmetric, this is the public key

-     * @param array                     $allowed_algs   List of supported verification algorithms

-     *                                                  Supported algorithms are 'ES256', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'

-     *

-     * @return object The JWT's payload as a PHP object

-     *

-     * @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's eligible as defined by 'nbf'

-     * @throws BeforeValidException         Provided JWT is trying to be used before it's been created as defined by 'iat'

-     * @throws ExpiredException             Provided JWT has since expired, as defined by the 'exp' claim

-     *

-     * @uses jsonDecode

-     * @uses urlsafeB64Decode

-     */

-    public static function decode($jwt, $key, array $allowed_algs = array())

-    {

-        $timestamp = \is_null(static::$timestamp) ? \time() : static::$timestamp;

-

-        if (empty($key)) {

-            throw new InvalidArgumentException('Key may not be empty');

-        }

-        $tks = \explode('.', $jwt);

-        if (\count($tks) != 3) {

-            throw new UnexpectedValueException('Wrong number of segments');

-        }

-        list($headb64, $bodyb64, $cryptob64) = $tks;

-        if (null === ($header = static::jsonDecode(static::urlsafeB64Decode($headb64)))) {

-            throw new UnexpectedValueException('Invalid header encoding');

-        }

-        if (null === $payload = static::jsonDecode(static::urlsafeB64Decode($bodyb64))) {

-            throw new UnexpectedValueException('Invalid claims encoding');

-        }

-        if (false === ($sig = static::urlsafeB64Decode($cryptob64))) {

-            throw new UnexpectedValueException('Invalid signature encoding');

-        }

-        if (empty($header->alg)) {

-            throw new UnexpectedValueException('Empty algorithm');

-        }

-        if (empty(static::$supported_algs[$header->alg])) {

-            throw new UnexpectedValueException('Algorithm not supported');

-        }

-        if (!\in_array($header->alg, $allowed_algs)) {

-            throw new UnexpectedValueException('Algorithm not allowed');

-        }

-        if ($header->alg === 'ES256') {

-            // OpenSSL expects an ASN.1 DER sequence for ES256 signatures

-            $sig = self::signatureToDER($sig);

-        }

-

-        if (\is_array($key) || $key instanceof \ArrayAccess) {

-            if (isset($header->kid)) {

-                if (!isset($key[$header->kid])) {

-                    throw new UnexpectedValueException('"kid" invalid, unable to lookup correct key');

-                }

-                $key = $key[$header->kid];

-            } else {

-                throw new UnexpectedValueException('"kid" empty, unable to lookup correct key');

-            }

-        }

-

-        // Check the signature

-        if (!static::verify("$headb64.$bodyb64", $sig, $key, $header->alg)) {

-            throw new SignatureInvalidException('Signature verification failed');

-        }

-

-        // Check the nbf if it is defined. This is the time that the

-        // token can actually be used. If it's not yet that time, abort.

-        if (isset($payload->nbf) && $payload->nbf > ($timestamp + static::$leeway)) {

-            throw new BeforeValidException(

-                'Cannot handle token prior to ' . \date(DateTime::ISO8601, $payload->nbf)

-            );

-        }

-

-        // Check that this token has been created before 'now'. This prevents

-        // using tokens that have been created for later use (and haven't

-        // correctly used the nbf claim).

-        if (isset($payload->iat) && $payload->iat > ($timestamp + static::$leeway)) {

-            throw new BeforeValidException(

-                'Cannot handle token prior to ' . \date(DateTime::ISO8601, $payload->iat)

-            );

-        }

-

-        // Check if this token has expired.

-        if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {

-            throw new ExpiredException('Expired token');

-        }

-

-        return $payload;

-    }

-

-    /**

-     * Converts and signs a PHP object or array into a JWT string.

-     *

-     * @param object|array  $payload    PHP object or array

-     * @param string        $key        The secret key.

-     *                                  If the algorithm used is asymmetric, this is the private key

-     * @param string        $alg        The signing algorithm.

-     *                                  Supported algorithms are 'ES256', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'

-     * @param mixed         $keyId

-     * @param array         $head       An array with header elements to attach

-     *

-     * @return string A signed JWT

-     *

-     * @uses jsonEncode

-     * @uses urlsafeB64Encode

-     */

-    public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)

-    {

-        $header = array('typ' => 'JWT', 'alg' => $alg);

-        if ($keyId !== null) {

-            $header['kid'] = $keyId;

-        }

-        if (isset($head) && \is_array($head)) {

-            $header = \array_merge($head, $header);

-        }

-        $segments = array();

-        $segments[] = static::urlsafeB64Encode(static::jsonEncode($header));

-        $segments[] = static::urlsafeB64Encode(static::jsonEncode($payload));

-        $signing_input = \implode('.', $segments);

-

-        $signature = static::sign($signing_input, $key, $alg);

-        $segments[] = static::urlsafeB64Encode($signature);

-

-        return \implode('.', $segments);

-    }

-

-    /**

-     * Sign a string with a given key and algorithm.

-     *

-     * @param string            $msg    The message to sign

-     * @param string|resource   $key    The secret key

-     * @param string            $alg    The signing algorithm.

-     *                                  Supported algorithms are 'ES256', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'

-     *

-     * @return string An encrypted message

-     *

-     * @throws DomainException Unsupported algorithm was specified

-     */

-    public static function sign($msg, $key, $alg = 'HS256')

-    {

-        if (empty(static::$supported_algs[$alg])) {

-            throw new DomainException('Algorithm not supported');

-        }

-        list($function, $algorithm) = static::$supported_algs[$alg];

-        switch ($function) {

-            case 'hash_hmac':

-                return \hash_hmac($algorithm, $msg, $key, true);

-            case 'openssl':

-                $signature = '';

-                $success = \openssl_sign($msg, $signature, $key, $algorithm);

-                if (!$success) {

-                    throw new DomainException("OpenSSL unable to sign data");

-                } else {

-                    if ($alg === 'ES256') {

-                        $signature = self::signatureFromDER($signature, 256);

-                    }

-                    return $signature;

-                }

-        }

-    }

-

-    /**

-     * 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   $key        For HS*, a string key works. for RS*, must be a resource of an openssl public key

-     * @param string            $alg        The algorithm

-     *

-     * @return bool

-     *

-     * @throws DomainException Invalid Algorithm or OpenSSL failure

-     */

-    private static function verify($msg, $signature, $key, $alg)

-    {

-        if (empty(static::$supported_algs[$alg])) {

-            throw new DomainException('Algorithm not supported');

-        }

-

-        list($function, $algorithm) = static::$supported_algs[$alg];

-        switch ($function) {

-            case 'openssl':

-                $success = \openssl_verify($msg, $signature, $key, $algorithm);

-                if ($success === 1) {

-                    return true;

-                } elseif ($success === 0) {

-                    return false;

-                }

-                // returns 1 on success, 0 on failure, -1 on error.

-                throw new DomainException(

-                    'OpenSSL error: ' . \openssl_error_string()

-                );

-            case 'hash_hmac':

-            default:

-                $hash = \hash_hmac($algorithm, $msg, $key, true);

-                if (\function_exists('hash_equals')) {

-                    return \hash_equals($signature, $hash);

-                }

-                $len = \min(static::safeStrlen($signature), static::safeStrlen($hash));

-

-                $status = 0;

-                for ($i = 0; $i < $len; $i++) {

-                    $status |= (\ord($signature[$i]) ^ \ord($hash[$i]));

-                }

-                $status |= (static::safeStrlen($signature) ^ static::safeStrlen($hash));

-

-                return ($status === 0);

-        }

-    }

-

-    /**

-     * Decode a JSON string into a PHP object.

-     *

-     * @param string $input JSON string

-     *

-     * @return object Object representation of JSON string

-     *

-     * @throws DomainException Provided string was invalid JSON

-     */

-    public static function jsonDecode($input)

-    {

-        if (\version_compare(PHP_VERSION, '5.4.0', '>=') && !(\defined('JSON_C_VERSION') && PHP_INT_SIZE > 4)) {

-            /** In PHP >=5.4.0, json_decode() accepts an options parameter, that allows you

-             * to specify that large ints (like Steam Transaction IDs) should be treated as

-             * strings, rather than the PHP default behaviour of converting them to floats.

-             */

-            $obj = \json_decode($input, false, 512, JSON_BIGINT_AS_STRING);

-        } else {

-            /** Not all servers will support that, however, so for older versions we must

-             * manually detect large ints in the JSON string and quote them (thus converting

-             *them to strings) before decoding, hence the preg_replace() call.

-             */

-            $max_int_length = \strlen((string) PHP_INT_MAX) - 1;

-            $json_without_bigints = \preg_replace('/:\s*(-?\d{'.$max_int_length.',})/', ': "$1"', $input);

-            $obj = \json_decode($json_without_bigints);

-        }

-

-        if ($errno = \json_last_error()) {

-            static::handleJsonError($errno);

-        } elseif ($obj === null && $input !== 'null') {

-            throw new DomainException('Null result with non-null input');

-        }

-        return $obj;

-    }

-

-    /**

-     * Encode a PHP object into a JSON string.

-     *

-     * @param object|array $input A PHP object or array

-     *

-     * @return string JSON representation of the PHP object or array

-     *

-     * @throws DomainException Provided object could not be encoded to valid JSON

-     */

-    public static function jsonEncode($input)

-    {

-        $json = \json_encode($input);

-        if ($errno = \json_last_error()) {

-            static::handleJsonError($errno);

-        } elseif ($json === 'null' && $input !== null) {

-            throw new DomainException('Null result with non-null input');

-        }

-        return $json;

-    }

-

-    /**

-     * Decode a string with URL-safe Base64.

-     *

-     * @param string $input A Base64 encoded string

-     *

-     * @return string A decoded string

-     */

-    public static function urlsafeB64Decode($input)

-    {

-        $remainder = \strlen($input) % 4;

-        if ($remainder) {

-            $padlen = 4 - $remainder;

-            $input .= \str_repeat('=', $padlen);

-        }

-        return \base64_decode(\strtr($input, '-_', '+/'));

-    }

-

-    /**

-     * 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($input)

-    {

-        return \str_replace('=', '', \strtr(\base64_encode($input), '+/', '-_'));

-    }

-

-    /**

-     * Helper method to create a JSON error.

-     *

-     * @param int $errno An error number from json_last_error()

-     *

-     * @return void

-     */

-    private static function handleJsonError($errno)

-    {

-        $messages = array(

-            JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',

-            JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON',

-            JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',

-            JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON',

-            JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3

-        );

-        throw new DomainException(

-            isset($messages[$errno])

-            ? $messages[$errno]

-            : 'Unknown JSON error: ' . $errno

-        );

-    }

-

-    /**

-     * Get the number of bytes in cryptographic strings.

-     *

-     * @param string $str

-     *

-     * @return int

-     */

-    private static function safeStrlen($str)

-    {

-        if (\function_exists('mb_strlen')) {

-            return \mb_strlen($str, '8bit');

-        }

-        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($sig)

-    {

-        // Separate the signature into r-value and s-value

-        list($r, $s) = \str_split($sig, (int) (\strlen($sig) / 2));

-

-        // Trim leading zeros

-        $r = \ltrim($r, "\x00");

-        $s = \ltrim($s, "\x00");

-

-        // Convert r-value and s-value from unsigned big-endian integers to

-        // signed two's complement

-        if (\ord($r[0]) > 0x7f) {

-            $r = "\x00" . $r;

-        }

-        if (\ord($s[0]) > 0x7f) {

-            $s = "\x00" . $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($type, $value)

-    {

-        $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($der, $keySize)

-    {

-        // 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's compliment to unsigned

-        // big-endian integers

-        $r = \ltrim($r, "\x00");

-        $s = \ltrim($s, "\x00");

-

-        // Pad out r and s so that they are $keySize bits long

-        $r = \str_pad($r, $keySize / 8, "\x00", STR_PAD_LEFT);

-        $s = \str_pad($s, $keySize / 8, "\x00", 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 [$offset, $data] the new offset and the decoded object

-     */

-    private static function readDER($der, $offset = 0)

-    {

-        $pos = $offset;

-        $size = \strlen($der);

-        $constructed = (\ord($der[$pos]) >> 5) & 0x01;

-        $type = \ord($der[$pos++]) & 0x1f;

-

-        // Length

-        $len = \ord($der[$pos++]);

-        if ($len & 0x80) {

-            $n = $len & 0x1f;

-            $len = 0;

-            while ($n-- && $pos < $size) {

-                $len = ($len << 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 array($pos, $data);

-    }

-}

new file mode 100644

@@ -0,0 +1,512 @@

+<?php

+

+namespace Firebase\JWT;

+

+use \DomainException;

+use \InvalidArgumentException;

+use \UnexpectedValueException;

+use \DateTime;

+

+/**

+ * 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 <neuman@twilio.com>

+ * @author   Anant Narayanan <anant@php.net>

+ * @license  http://opensource.org/licenses/BSD-3-Clause 3-clause BSD

+ * @link     https://github.com/firebase/php-jwt

+ */

+class JWT

+{

+    const ASN1_INTEGER = 0x02;

+    const ASN1_SEQUENCE = 0x10;

+    const ASN1_BIT_STRING = 0x03;

+

+    /**

+     * When checking nbf, iat or expiration times,

+     * we want to provide some extra leeway time to

+     * account for clock skew.

+     */

+    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.

+     */

+    public static $timestamp = null;

+

+    public static $supported_algs = array(

+        'ES256' => array('openssl', 'SHA256'),

+        'HS256' => array('hash_hmac', 'SHA256'),

+        'HS384' => array('hash_hmac', 'SHA384'),

+        'HS512' => array('hash_hmac', 'SHA512'),

+        'RS256' => array('openssl', 'SHA256'),

+        'RS384' => array('openssl', 'SHA384'),

+        'RS512' => array('openssl', 'SHA512'),

+    );

+

+    /**

+     * Decodes a JWT string into a PHP object.

+     *

+     * @param string                    $jwt            The JWT

+     * @param string|array|resource     $key            The key, or map of keys.

+     *                                                  If the algorithm used is asymmetric, this is the public key

+     * @param array                     $allowed_algs   List of supported verification algorithms

+     *                                                  Supported algorithms are 'ES256', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'

+     *

+     * @return object The JWT's payload as a PHP object

+     *

+     * @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's eligible as defined by 'nbf'

+     * @throws BeforeValidException         Provided JWT is trying to be used before it's been created as defined by 'iat'

+     * @throws ExpiredException             Provided JWT has since expired, as defined by the 'exp' claim

+     *

+     * @uses jsonDecode

+     * @uses urlsafeB64Decode

+     */

+    public static function decode($jwt, $key, array $allowed_algs = array())

+    {

+        $timestamp = \is_null(static::$timestamp) ? \time() : static::$timestamp;

+

+        if (empty($key)) {

+            throw new InvalidArgumentException('Key may not be empty');

+        }

+        $tks = \explode('.', $jwt);

+        if (\count($tks) != 3) {

+            throw new UnexpectedValueException('Wrong number of segments');

+        }

+        list($headb64, $bodyb64, $cryptob64) = $tks;

+        if (null === ($header = static::jsonDecode(static::urlsafeB64Decode($headb64)))) {

+            throw new UnexpectedValueException('Invalid header encoding');

+        }

+        if (null === $payload = static::jsonDecode(static::urlsafeB64Decode($bodyb64))) {

+            throw new UnexpectedValueException('Invalid claims encoding');

+        }

+        if (false === ($sig = static::urlsafeB64Decode($cryptob64))) {

+            throw new UnexpectedValueException('Invalid signature encoding');

+        }

+        if (empty($header->alg)) {

+            throw new UnexpectedValueException('Empty algorithm');

+        }

+        if (empty(static::$supported_algs[$header->alg])) {

+            throw new UnexpectedValueException('Algorithm not supported');

+        }

+        if (!\in_array($header->alg, $allowed_algs)) {

+            throw new UnexpectedValueException('Algorithm not allowed');

+        }

+        if ($header->alg === 'ES256') {

+            // OpenSSL expects an ASN.1 DER sequence for ES256 signatures

+            $sig = self::signatureToDER($sig);

+        }

+

+        if (\is_array($key) || $key instanceof \ArrayAccess) {

+            if (isset($header->kid)) {

+                if (!isset($key[$header->kid])) {

+                    throw new UnexpectedValueException('"kid" invalid, unable to lookup correct key');

+                }

+                $key = $key[$header->kid];

+            } else {

+                throw new UnexpectedValueException('"kid" empty, unable to lookup correct key');

+            }

+        }

+

+        // Check the signature

+        if (!static::verify("$headb64.$bodyb64", $sig, $key, $header->alg)) {

+            throw new SignatureInvalidException('Signature verification failed');

+        }

+

+        // Check the nbf if it is defined. This is the time that the

+        // token can actually be used. If it's not yet that time, abort.

+        if (isset($payload->nbf) && $payload->nbf > ($timestamp + static::$leeway)) {

+            throw new BeforeValidException(

+                'Cannot handle token prior to ' . \date(DateTime::ISO8601, $payload->nbf)

+            );

+        }

+

+        // Check that this token has been created before 'now'. This prevents

+        // using tokens that have been created for later use (and haven't

+        // correctly used the nbf claim).

+        if (isset($payload->iat) && $payload->iat > ($timestamp + static::$leeway)) {

+            throw new BeforeValidException(

+                'Cannot handle token prior to ' . \date(DateTime::ISO8601, $payload->iat)

+            );

+        }

+

+        // Check if this token has expired.

+        if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {

+            throw new ExpiredException('Expired token');

+        }

+

+        return $payload;

+    }

+

+    /**

+     * Converts and signs a PHP object or array into a JWT string.

+     *

+     * @param object|array  $payload    PHP object or array

+     * @param string        $key        The secret key.

+     *                                  If the algorithm used is asymmetric, this is the private key

+     * @param string        $alg        The signing algorithm.

+     *                                  Supported algorithms are 'ES256', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'

+     * @param mixed         $keyId

+     * @param array         $head       An array with header elements to attach

+     *

+     * @return string A signed JWT

+     *

+     * @uses jsonEncode

+     * @uses urlsafeB64Encode

+     */

+    public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)

+    {

+        $header = array('typ' => 'JWT', 'alg' => $alg);

+        if ($keyId !== null) {

+            $header['kid'] = $keyId;

+        }

+        if (isset($head) && \is_array($head)) {

+            $header = \array_merge($head, $header);

+        }

+        $segments = array();

+        $segments[] = static::urlsafeB64Encode(static::jsonEncode($header));

+        $segments[] = static::urlsafeB64Encode(static::jsonEncode($payload));

+        $signing_input = \implode('.', $segments);

+

+        $signature = static::sign($signing_input, $key, $alg);

+        $segments[] = static::urlsafeB64Encode($signature);

+

+        return \implode('.', $segments);

+    }

+

+    /**

+     * Sign a string with a given key and algorithm.

+     *

+     * @param string            $msg    The message to sign

+     * @param string|resource   $key    The secret key

+     * @param string            $alg    The signing algorithm.

+     *                                  Supported algorithms are 'ES256', 'HS256', 'HS384', 'HS512', 'RS256', 'RS384', and 'RS512'

+     *

+     * @return string An encrypted message

+     *

+     * @throws DomainException Unsupported algorithm was specified

+     */

+    public static function sign($msg, $key, $alg = 'HS256')

+    {

+        if (empty(static::$supported_algs[$alg])) {

+            throw new DomainException('Algorithm not supported');

+        }

+        list($function, $algorithm) = static::$supported_algs[$alg];

+        switch ($function) {

+            case 'hash_hmac':

+                return \hash_hmac($algorithm, $msg, $key, true);

+            case 'openssl':

+                $signature = '';

+                $success = \openssl_sign($msg, $signature, $key, $algorithm);

+                if (!$success) {

+                    throw new DomainException("OpenSSL unable to sign data");

+                } else {

+                    if ($alg === 'ES256') {

+                        $signature = self::signatureFromDER($signature, 256);

+                    }

+                    return $signature;

+                }

+        }

+    }

+

+    /**

+     * 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   $key        For HS*, a string key works. for RS*, must be a resource of an openssl public key

+     * @param string            $alg        The algorithm

+     *

+     * @return bool

+     *

+     * @throws DomainException Invalid Algorithm or OpenSSL failure

+     */

+    private static function verify($msg, $signature, $key, $alg)

+    {

+        if (empty(static::$supported_algs[$alg])) {

+            throw new DomainException('Algorithm not supported');

+        }

+

+        list($function, $algorithm) = static::$supported_algs[$alg];

+        switch ($function) {

+            case 'openssl':

+                $success = \openssl_verify($msg, $signature, $key, $algorithm);

+                if ($success === 1) {

+                    return true;

+                } elseif ($success === 0) {

+                    return false;

+                }

+                // returns 1 on success, 0 on failure, -1 on error.

+                throw new DomainException(

+                    'OpenSSL error: ' . \openssl_error_string()

+                );

+            case 'hash_hmac':

+            default:

+                $hash = \hash_hmac($algorithm, $msg, $key, true);

+                if (\function_exists('hash_equals')) {

+                    return \hash_equals($signature, $hash);

+                }

+                $len = \min(static::safeStrlen($signature), static::safeStrlen($hash));

+

+                $status = 0;

+                for ($i = 0; $i < $len; $i++) {

+                    $status |= (\ord($signature[$i]) ^ \ord($hash[$i]));

+                }

+                $status |= (static::safeStrlen($signature) ^ static::safeStrlen($hash));

+

+                return ($status === 0);

+        }

+    }

+

+    /**

+     * Decode a JSON string into a PHP object.

+     *

+     * @param string $input JSON string

+     *

+     * @return object Object representation of JSON string

+     *

+     * @throws DomainException Provided string was invalid JSON

+     */

+    public static function jsonDecode($input)

+    {

+        if (\version_compare(PHP_VERSION, '5.4.0', '>=') && !(\defined('JSON_C_VERSION') && PHP_INT_SIZE > 4)) {

+            /** In PHP >=5.4.0, json_decode() accepts an options parameter, that allows you

+             * to specify that large ints (like Steam Transaction IDs) should be treated as

+             * strings, rather than the PHP default behaviour of converting them to floats.

+             */

+            $obj = \json_decode($input, false, 512, JSON_BIGINT_AS_STRING);

+        } else {

+            /** Not all servers will support that, however, so for older versions we must

+             * manually detect large ints in the JSON string and quote them (thus converting

+             *them to strings) before decoding, hence the preg_replace() call.

+             */

+            $max_int_length = \strlen((string) PHP_INT_MAX) - 1;

+            $json_without_bigints = \preg_replace('/:\s*(-?\d{'.$max_int_length.',})/', ': "$1"', $input);

+            $obj = \json_decode($json_without_bigints);

+        }

+

+        if ($errno = \json_last_error()) {

+            static::handleJsonError($errno);

+        } elseif ($obj === null && $input !== 'null') {

+            throw new DomainException('Null result with non-null input');

+        }

+        return $obj;

+    }

+

+    /**

+     * Encode a PHP object into a JSON string.

+     *

+     * @param object|array $input A PHP object or array

+     *

+     * @return string JSON representation of the PHP object or array

+     *

+     * @throws DomainException Provided object could not be encoded to valid JSON

+     */

+    public static function jsonEncode($input)

+    {

+        $json = \json_encode($input);

+        if ($errno = \json_last_error()) {

+            static::handleJsonError($errno);

+        } elseif ($json === 'null' && $input !== null) {

+            throw new DomainException('Null result with non-null input');

+        }

+        return $json;

+    }

+

+    /**

+     * Decode a string with URL-safe Base64.

+     *

+     * @param string $input A Base64 encoded string

+     *

+     * @return string A decoded string

+     */

+    public static function urlsafeB64Decode($input)

+    {

+        $remainder = \strlen($input) % 4;

+        if ($remainder) {

+            $padlen = 4 - $remainder;

+            $input .= \str_repeat('=', $padlen);

+        }

+        return \base64_decode(\strtr($input, '-_', '+/'));

+    }

+

+    /**

+     * 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($input)

+    {

+        return \str_replace('=', '', \strtr(\base64_encode($input), '+/', '-_'));

+    }

+

+    /**

+     * Helper method to create a JSON error.

+     *

+     * @param int $errno An error number from json_last_error()

+     *

+     * @return void

+     */

+    private static function handleJsonError($errno)