public function decrypt()
{
$des = new \phpseclib\Crypt\DES();
$des->setKey($this->key);
$ciphertext = file_get_contents($this->getFileUploadDir() . '/' . $this->file_name);
$plaintext = $des->decrypt($ciphertext);
$hash = md5($plaintext);
$this->save_name = "DecryptedFile_" . $hash;
file_put_contents($this->getFileRootDir() . '/' . $this->save_name, $plaintext);
unlink($this->file->getPathname());
return new CryptoFile($hash, $this->getWebPath() . '/' . $this->save_name);
}
$ivSize = 8; $randomIV = phpseclib\Crypt\Random::string($ivSize); echo 'Plaintext: ' . $plaintext . "\r\n"; //Create new DES object for encryption $des_encrypt = new \phpseclib\Crypt\DES(\phpseclib\Crypt\DES::MODE_CBC); //Set preferred engine to OPENSSL $des_encrypt->setPreferredEngine(phpseclib\Crypt\DES::ENGINE_OPENSSL); //set key length to 256 $des_encrypt->setKeyLength(64); //set pbkdf2 with sha512 and 4096 iterations as default password hashing method $des_encrypt->setPassword($password, 'pbkdf2', 'sha512', NULL, 4096); $des_encrypt->setIV($randomIV); $ciphertext_raw = $des_encrypt->encrypt($plaintext); echo 'Ciphertext(RAW): ' . $ciphertext_raw . "\r\n"; $ciphertext = base64_encode($randomIV . $ciphertext_raw); echo 'Ciphertext(base64): ' . $ciphertext . "\r\n"; //Create new DES object for decryption $des_decrypt = new phpseclib\Crypt\DES(phpseclib\Crypt\DES::MODE_CBC); //set OPENSSL as preferred engine $des_decrypt->setPreferredEngine(phpseclib\Crypt\DES::ENGINE_OPENSSL); //set key length to 256 $des_decrypt->setKeyLength(64); //set pbkdf2 with sha512 and 4096 iterations as default password hashing method $des_decrypt->setPassword($password, 'pbkdf2', 'sha512', NULL, 4096); $ciphertext_decoded = base64_decode($ciphertext); $des_decrypt->setIV(substr($ciphertext_decoded, 0, $ivSize)); //decode from base64 and decrypt $decrypted = $des_decrypt->decrypt(substr($ciphertext_decoded, $ivSize)); echo 'Decrypted: ' . $decrypted . "\r\n"; //is everything ok? var_dump($plaintext == $decrypted);
