Project import generated by Copybara.
GitOrigin-RevId: 63746295f1a5ab5a619056791995793d65529e62
diff --git a/src/lib/WebAuthn/Binary/ByteBuffer.php b/src/lib/WebAuthn/Binary/ByteBuffer.php
new file mode 100644
index 0000000..861ed60
--- /dev/null
+++ b/src/lib/WebAuthn/Binary/ByteBuffer.php
@@ -0,0 +1,300 @@
+<?php
+
+
+namespace lbuchs\WebAuthn\Binary;
+use lbuchs\WebAuthn\WebAuthnException;
+
+/**
+ * Modified version of https://github.com/madwizard-thomas/webauthn-server/blob/master/src/Format/ByteBuffer.php
+ * Copyright © 2018 Thomas Bleeker - MIT licensed
+ * Modified by Lukas Buchs
+ * Thanks Thomas for your work!
+ */
+class ByteBuffer implements \JsonSerializable, \Serializable {
+ /**
+ * @var bool
+ */
+ public static $useBase64UrlEncoding = false;
+
+ /**
+ * @var string
+ */
+ private $_data;
+
+ /**
+ * @var int
+ */
+ private $_length;
+
+ public function __construct($binaryData) {
+ $this->_data = (string)$binaryData;
+ $this->_length = \strlen($binaryData);
+ }
+
+
+ // -----------------------
+ // PUBLIC STATIC
+ // -----------------------
+
+ /**
+ * create a ByteBuffer from a base64 url encoded string
+ * @param string $base64url
+ * @return ByteBuffer
+ */
+ public static function fromBase64Url($base64url): ByteBuffer {
+ $bin = self::_base64url_decode($base64url);
+ if ($bin === false) {
+ throw new WebAuthnException('ByteBuffer: Invalid base64 url string', WebAuthnException::BYTEBUFFER);
+ }
+ return new ByteBuffer($bin);
+ }
+
+ /**
+ * create a ByteBuffer from a base64 url encoded string
+ * @param string $hex
+ * @return ByteBuffer
+ */
+ public static function fromHex($hex): ByteBuffer {
+ $bin = \hex2bin($hex);
+ if ($bin === false) {
+ throw new WebAuthnException('ByteBuffer: Invalid hex string', WebAuthnException::BYTEBUFFER);
+ }
+ return new ByteBuffer($bin);
+ }
+
+ /**
+ * create a random ByteBuffer
+ * @param string $length
+ * @return ByteBuffer
+ */
+ public static function randomBuffer($length): ByteBuffer {
+ if (\function_exists('random_bytes')) { // >PHP 7.0
+ return new ByteBuffer(\random_bytes($length));
+
+ } else if (\function_exists('openssl_random_pseudo_bytes')) {
+ return new ByteBuffer(\openssl_random_pseudo_bytes($length));
+
+ } else {
+ throw new WebAuthnException('ByteBuffer: cannot generate random bytes', WebAuthnException::BYTEBUFFER);
+ }
+ }
+
+ // -----------------------
+ // PUBLIC
+ // -----------------------
+
+ public function getBytes($offset, $length): string {
+ if ($offset < 0 || $length < 0 || ($offset + $length > $this->_length)) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset or length', WebAuthnException::BYTEBUFFER);
+ }
+ return \substr($this->_data, $offset, $length);
+ }
+
+ public function getByteVal($offset): int {
+ if ($offset < 0 || $offset >= $this->_length) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
+ }
+ return \ord(\substr($this->_data, $offset, 1));
+ }
+
+ public function getJson($jsonFlags=0) {
+ $data = \json_decode($this->getBinaryString(), null, 512, $jsonFlags);
+ if (\json_last_error() !== JSON_ERROR_NONE) {
+ throw new WebAuthnException(\json_last_error_msg(), WebAuthnException::BYTEBUFFER);
+ }
+ return $data;
+ }
+
+ public function getLength(): int {
+ return $this->_length;
+ }
+
+ public function getUint16Val($offset) {
+ if ($offset < 0 || ($offset + 2) > $this->_length) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
+ }
+ return unpack('n', $this->_data, $offset)[1];
+ }
+
+ public function getUint32Val($offset) {
+ if ($offset < 0 || ($offset + 4) > $this->_length) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
+ }
+ $val = unpack('N', $this->_data, $offset)[1];
+
+ // Signed integer overflow causes signed negative numbers
+ if ($val < 0) {
+ throw new WebAuthnException('ByteBuffer: Value out of integer range.', WebAuthnException::BYTEBUFFER);
+ }
+ return $val;
+ }
+
+ public function getUint64Val($offset) {
+ if (PHP_INT_SIZE < 8) {
+ throw new WebAuthnException('ByteBuffer: 64-bit values not supported by this system', WebAuthnException::BYTEBUFFER);
+ }
+ if ($offset < 0 || ($offset + 8) > $this->_length) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
+ }
+ $val = unpack('J', $this->_data, $offset)[1];
+
+ // Signed integer overflow causes signed negative numbers
+ if ($val < 0) {
+ throw new WebAuthnException('ByteBuffer: Value out of integer range.', WebAuthnException::BYTEBUFFER);
+ }
+
+ return $val;
+ }
+
+ public function getHalfFloatVal($offset) {
+ //FROM spec pseudo decode_half(unsigned char *halfp)
+ $half = $this->getUint16Val($offset);
+
+ $exp = ($half >> 10) & 0x1f;
+ $mant = $half & 0x3ff;
+
+ if ($exp === 0) {
+ $val = $mant * (2 ** -24);
+ } elseif ($exp !== 31) {
+ $val = ($mant + 1024) * (2 ** ($exp - 25));
+ } else {
+ $val = ($mant === 0) ? INF : NAN;
+ }
+
+ return ($half & 0x8000) ? -$val : $val;
+ }
+
+ public function getFloatVal($offset) {
+ if ($offset < 0 || ($offset + 4) > $this->_length) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
+ }
+ return unpack('G', $this->_data, $offset)[1];
+ }
+
+ public function getDoubleVal($offset) {
+ if ($offset < 0 || ($offset + 8) > $this->_length) {
+ throw new WebAuthnException('ByteBuffer: Invalid offset', WebAuthnException::BYTEBUFFER);
+ }
+ return unpack('E', $this->_data, $offset)[1];
+ }
+
+ /**
+ * @return string
+ */
+ public function getBinaryString(): string {
+ return $this->_data;
+ }
+
+ /**
+ * @param string|ByteBuffer $buffer
+ * @return bool
+ */
+ public function equals($buffer): bool {
+ if (is_object($buffer) && $buffer instanceof ByteBuffer) {
+ return $buffer->getBinaryString() === $this->getBinaryString();
+
+ } else if (is_string($buffer)) {
+ return $buffer === $this->getBinaryString();
+ }
+
+ return false;
+ }
+
+ /**
+ * @return string
+ */
+ public function getHex(): string {
+ return \bin2hex($this->_data);
+ }
+
+ /**
+ * @return bool
+ */
+ public function isEmpty(): bool {
+ return $this->_length === 0;
+ }
+
+
+ /**
+ * jsonSerialize interface
+ * return binary data in RFC 1342-Like serialized string
+ * @return string
+ */
+ public function jsonSerialize(): string {
+ if (ByteBuffer::$useBase64UrlEncoding) {
+ return self::_base64url_encode($this->_data);
+
+ } else {
+ return '=?BINARY?B?' . \base64_encode($this->_data) . '?=';
+ }
+ }
+
+ /**
+ * Serializable-Interface
+ * @return string
+ */
+ public function serialize(): string {
+ return \serialize($this->_data);
+ }
+
+ /**
+ * Serializable-Interface
+ * @param string $serialized
+ */
+ public function unserialize($serialized) {
+ $this->_data = \unserialize($serialized);
+ $this->_length = \strlen($this->_data);
+ }
+
+ /**
+ * (PHP 8 deprecates Serializable-Interface)
+ * @return array
+ */
+ public function __serialize(): array {
+ return [
+ 'data' => \serialize($this->_data)
+ ];
+ }
+
+ /**
+ * object to string
+ * @return string
+ */
+ public function __toString(): string {
+ return $this->getHex();
+ }
+
+ /**
+ * (PHP 8 deprecates Serializable-Interface)
+ * @param array $data
+ * @return void
+ */
+ public function __unserialize($data) {
+ if ($data && isset($data['data'])) {
+ $this->_data = \unserialize($data['data']);
+ $this->_length = \strlen($this->_data);
+ }
+ }
+
+ // -----------------------
+ // PROTECTED STATIC
+ // -----------------------
+
+ /**
+ * base64 url decoding
+ * @param string $data
+ * @return string
+ */
+ protected static function _base64url_decode($data): string {
+ return \base64_decode(\strtr($data, '-_', '+/') . \str_repeat('=', 3 - (3 + \strlen($data)) % 4));
+ }
+
+ /**
+ * base64 url encoding
+ * @param string $data
+ * @return string
+ */
+ protected static function _base64url_encode($data): string {
+ return \rtrim(\strtr(\base64_encode($data), '+/', '-_'), '=');
+ }
+}