106 lines
2.5 KiB
PHP
106 lines
2.5 KiB
PHP
<?php
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namespace Objects;
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class AesStream {
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private string $key;
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private string $iv;
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private $callback;
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private ?string $outputFile;
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private ?string $inputFile;
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public function __construct(string $key, string $iv) {
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$this->key = $key;
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$this->iv = $iv;
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$this->inputFile = null;
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$this->outputFile = null;
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$this->callback = null;
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if (!in_array(strlen($key), [16, 24, 32])) {
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throw new \Exception("Invalid Key Size");
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} else if (strlen($iv) !== 16) {
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throw new \Exception("Invalid IV Size");
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}
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}
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public function setInputFile(string $file) {
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$this->inputFile = $file;
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}
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public function setOutput(callable $callback) {
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$this->callback = $callback;
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}
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public function setOutputFile(string $file) {
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$this->outputFile = $file;
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}
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public function start(): bool {
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if (!$this->inputFile) {
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return false;
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}
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$blockSize = 16;
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$aesMode = $this->getCipherMode();
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$outputHandle = null;
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$inputHandle = fopen($this->inputFile, "rb");
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if (!$inputHandle) {
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return false;
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}
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if ($this->outputFile !== null) {
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$outputHandle = fopen($this->outputFile, "wb");
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if (!$outputHandle) {
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fclose($inputHandle);
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return false;
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}
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}
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set_time_limit(0);
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$ivCounter = $this->iv;
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$modulo = \gmp_init("0x1" . str_repeat("00", $blockSize), 16);
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while (!feof($inputHandle)) {
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$chunk = fread($inputHandle, 65536);
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$chunkSize = strlen($chunk);
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if ($chunkSize > 0) {
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$blockCount = intval(ceil($chunkSize / $blockSize));
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$encrypted = openssl_encrypt($chunk, $aesMode, $this->key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $ivCounter);
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$ivNumber = \gmp_init(bin2hex($ivCounter), 16);
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$ivNumber = \gmp_add($ivNumber, $blockCount);
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$ivNumber = \gmp_mod($ivNumber, $modulo);
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$ivNumber = str_pad(\gmp_strval($ivNumber, 16), $blockSize * 2, "0", STR_PAD_LEFT);
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$ivCounter = hex2bin($ivNumber);
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if ($this->callback !== null) {
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call_user_func($this->callback, $encrypted);
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}
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if ($outputHandle !== null) {
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fwrite($outputHandle, $encrypted);
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}
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}
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}
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fclose($inputHandle);
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if ($outputHandle) fclose($outputHandle);
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return true;
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}
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public function getCipherMode(): string {
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$bitStrength = strlen($this->key) * 8;
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return "aes-$bitStrength-ctr";
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}
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public function getKey(): string {
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return $this->key;
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}
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public function getIV(): string {
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return $this->iv;
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}
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} |