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<?php |
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/* |
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* This file is part of the tmilos/jose-jwt package. |
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* |
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* (c) Milos Tomic <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace Tmilos\JoseJwt\Util; |
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use Tmilos\JoseJwt\Error\JoseJwtException; |
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use Tmilos\JoseJwt\Json\JsonMapper; |
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class StringUtils |
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{ |
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private function __construct() |
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{ |
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} |
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/** |
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* Compares two strings. |
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* |
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* This method implements a constant-time algorithm to compare strings. |
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* Regardless of the used implementation, it will leak length information. |
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* |
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* @param string $knownString The string of known length to compare against |
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* @param string $userInput The string that the user can control |
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* |
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* @return bool true if the two strings are the same, false otherwise |
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*/ |
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public static function equals($knownString, $userInput) |
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{ |
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static $exists = null; |
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if (null === $exists) { |
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$exists = function_exists('hash_equals'); |
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} |
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$knownString = (string) $knownString; |
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$userInput = (string) $userInput; |
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if ($exists) { |
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return hash_equals($knownString, $userInput); |
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} |
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$knownLen = strlen($knownString); |
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$userLen = strlen($userInput); |
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// Extend the known string to avoid uninitialized string offsets |
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$knownString .= $userInput; |
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// Set the result to the difference between the lengths |
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$result = $knownLen - $userLen; |
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// Note that we ALWAYS iterate over the user-supplied length |
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// This is to mitigate leaking length information |
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for ($i = 0; $i < $userLen; ++$i) { |
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$result |= (ord($knownString[$i]) ^ ord($userInput[$i])); |
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} |
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// They are only identical strings if $result is exactly 0... |
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return 0 === $result; |
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} |
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/** |
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* @param string $value |
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* |
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* @return int |
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*/ |
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public static function length($value) |
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{ |
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static $exists = null; |
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if (null === $exists) { |
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$exists = function_exists('mb_strlen'); |
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} |
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if ($exists) { |
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return mb_strlen($value, '8bit'); |
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} |
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return strlen($value); |
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} |
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/** |
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* @param string $value |
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* @param int $start |
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* @param int $length |
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* |
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* @return string |
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*/ |
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public static function substring($value, $start = 0, $length = null) |
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{ |
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static $exists = null; |
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if (null === $exists) { |
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$exists = function_exists('mb_substr'); |
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} |
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if ($exists) { |
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return mb_substr($value, $start, $length, '8bit'); |
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} elseif ($length !== null) { |
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return substr($value, $start, $length); |
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} |
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return substr($value, $start); |
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} |
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/** |
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* @param string|array|object $payload |
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* @param JsonMapper $mapper |
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* |
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* @return string |
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*/ |
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public static function payload2string($payload, JsonMapper $mapper = null) |
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{ |
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if (is_array($payload)) { |
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return json_encode($payload, JSON_UNESCAPED_SLASHES); |
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} elseif (is_string($payload) || null === $payload) { |
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if (trim($payload) !== '') { |
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return $payload; |
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} else { |
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throw new JoseJwtException('Payload can not be empty'); |
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} |
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} elseif (is_object($payload) && $payload instanceof \JsonSerializable) { |
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return json_encode($payload, JSON_UNESCAPED_SLASHES); |
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} elseif (is_object($payload) && $mapper) { |
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return $mapper->getJsonString($payload); |
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} |
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throw new JoseJwtException('Unable to serialize payload'); |
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} |
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} |
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tmilos /
jose-jwt
