[Web] Feature (beta): Add WebAuthn support for administrators and domain administrators
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andryyy
255
data/web/inc/lib/WebAuthn/Binary/ByteBuffer.php
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255
data/web/inc/lib/WebAuthn/Binary/ByteBuffer.php
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<?php
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namespace WebAuthn\Binary;
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use WebAuthn\WebAuthnException;
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/**
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* Modified version of https://github.com/madwizard-thomas/webauthn-server/blob/master/src/Format/ByteBuffer.php
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* Copyright © 2018 Thomas Bleeker - MIT licensed
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* Modified by Lukas Buchs
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* Thanks Thomas for your work!
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*/
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class ByteBuffer implements \JsonSerializable, \Serializable {
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/**
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* @var bool
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*/
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public static $useBase64UrlEncoding = false;
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/**
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* @var string
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*/
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private $_data;
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/**
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* @var int
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*/
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private $_length;
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public function __construct($binaryData) {
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$this->_data = $binaryData;
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$this->_length = \strlen($binaryData);
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}
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// -----------------------
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// PUBLIC STATIC
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// -----------------------
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/**
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* create a ByteBuffer from a base64 url encoded string
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* @param string $base64url
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* @return \WebAuthn\Binary\ByteBuffer
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*/
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public static function fromBase64Url($base64url) {
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$bin = self::_base64url_decode($base64url);
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if ($bin === false) {
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throw new WebAuthnException('ByteBuffer: Invalid base64 url string', WebAuthnException::BYTEBUFFER);
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}
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return new ByteBuffer($bin);
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}
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/**
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* create a ByteBuffer from a base64 url encoded string
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* @param string $hex
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* @return \WebAuthn\Binary\ByteBuffer
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*/
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public static function fromHex($hex) {
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$bin = \hex2bin($hex);
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if ($bin === false) {
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throw new WebAuthnException('ByteBuffer: Invalid hex string', WebAuthnException::BYTEBUFFER);
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}
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return new ByteBuffer($bin);
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}
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/**
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* create a random ByteBuffer
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* @param string $length
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* @return \WebAuthn\Binary\ByteBuffer
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*/
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public static function randomBuffer($length) {
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if (\function_exists('random_bytes')) { // >PHP 7.0
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return new ByteBuffer(\random_bytes($length));
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} else if (\function_exists('openssl_random_pseudo_bytes')) {
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return new ByteBuffer(\openssl_random_pseudo_bytes($length));
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} else {
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throw new WebAuthnException('ByteBuffer: cannot generate random bytes', WebAuthnException::BYTEBUFFER);
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}
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}
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// -----------------------
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// PUBLIC
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// -----------------------
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public function getBytes($offset, $length) {
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if ($offset < 0 || $length < 0 || ($offset + $length > $this->_length)) {
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throw new WebAuthnException('ByteBuffer: Invalid offset or length', WebAuthnException::BYTEBUFFER);
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}
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return \substr($this->_data, $offset, $length);
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}
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public function getByteVal($offset) {
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if ($offset < 0 || $offset >= $this->_length) {
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throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
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}
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return \ord(\substr($this->_data, $offset, 1));
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}
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public function getLength() {
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return $this->_length;
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}
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public function getUint16Val($offset) {
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if ($offset < 0 || ($offset + 2) > $this->_length) {
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throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
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}
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return unpack('n', $this->_data, $offset)[1];
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}
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public function getUint32Val($offset) {
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if ($offset < 0 || ($offset + 4) > $this->_length) {
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throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
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}
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$val = unpack('N', $this->_data, $offset)[1];
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// Signed integer overflow causes signed negative numbers
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if ($val < 0) {
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throw new WebAuthnException('ByteBuffer: Value out of integer range.', WebAuthnException::BYTEBUFFER);
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}
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return $val;
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}
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public function getUint64Val($offset) {
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if (PHP_INT_SIZE < 8) {
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throw new WebAuthnException('ByteBuffer: 64-bit values not supported by this system', WebAuthnException::BYTEBUFFER);
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}
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if ($offset < 0 || ($offset + 8) > $this->_length) {
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throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
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}
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$val = unpack('J', $this->_data, $offset)[1];
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// Signed integer overflow causes signed negative numbers
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if ($val < 0) {
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throw new WebAuthnException('ByteBuffer: Value out of integer range.', WebAuthnException::BYTEBUFFER);
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}
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return $val;
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}
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public function getHalfFloatVal($offset) {
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//FROM spec pseudo decode_half(unsigned char *halfp)
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$half = $this->getUint16Val($offset);
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$exp = ($half >> 10) & 0x1f;
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$mant = $half & 0x3ff;
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if ($exp === 0) {
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$val = $mant * (2 ** -24);
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} elseif ($exp !== 31) {
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$val = ($mant + 1024) * (2 ** ($exp - 25));
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} else {
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$val = ($mant === 0) ? INF : NAN;
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}
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return ($half & 0x8000) ? -$val : $val;
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}
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public function getFloatVal($offset) {
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if ($offset < 0 || ($offset + 4) > $this->_length) {
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throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
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}
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return unpack('G', $this->_data, $offset)[1];
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}
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public function getDoubleVal($offset) {
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if ($offset < 0 || ($offset + 8) > $this->_length) {
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throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
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}
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return unpack('E', $this->_data, $offset)[1];
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}
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/**
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* @return string
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*/
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public function getBinaryString() {
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return $this->_data;
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}
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/**
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* @param string $buffer
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* @return bool
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*/
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public function equals($buffer) {
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return is_string($this->_data) && $this->_data === $buffer->data;
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}
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/**
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* @return string
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*/
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public function getHex() {
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return \bin2hex($this->_data);
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}
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/**
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* @return bool
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*/
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public function isEmpty() {
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return $this->_length === 0;
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}
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/**
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* jsonSerialize interface
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* return binary data in RFC 1342-Like serialized string
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* @return \stdClass
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*/
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public function jsonSerialize() {
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if (ByteBuffer::$useBase64UrlEncoding) {
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return self::_base64url_encode($this->_data);
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} else {
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return '=?BINARY?B?' . \base64_encode($this->_data) . '?=';
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}
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}
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/**
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* Serializable-Interface
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* @return string
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*/
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public function serialize() {
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return \serialize($this->_data);
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}
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/**
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* Serializable-Interface
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* @param string $serialized
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*/
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public function unserialize($serialized) {
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$this->_data = \unserialize($serialized);
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$this->_length = \strlen($this->_data);
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}
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// -----------------------
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// PROTECTED STATIC
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// -----------------------
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/**
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* base64 url decoding
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* @param string $data
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* @return string
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*/
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protected static function _base64url_decode($data) {
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return \base64_decode(\strtr($data, '-_', '+/') . \str_repeat('=', 3 - (3 + \strlen($data)) % 4));
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}
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/**
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* base64 url encoding
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* @param string $data
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* @return string
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*/
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protected static function _base64url_encode($data) {
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return \rtrim(\strtr(\base64_encode($data), '+/', '-_'), '=');
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}
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}
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