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# Constant-Time Encoding [](https://github.com/paragonie/constant_time_encoding/actions) [](https://github.com/paragonie/constant_time_encoding/actions) [](https://packagist.org/packages/paragonie/constant_time_encoding) [](https://packagist.org/packages/paragonie/constant_time_encoding) [](https://packagist.org/packages/paragonie/constant_time_encoding) [](https://packagist.org/packages/paragonie/constant_time_encoding) Based on the [constant-time base64 implementation made by Steve "Sc00bz" Thomas](https://github.com/Sc00bz/ConstTimeEncoding), this library aims to offer character encoding functions that do not leak information about what you are encoding/decoding via processor cache misses. Further reading on [cache-timing attacks](http://blog.ircmaxell.com/2014/11/its-all-about-time.html). Our fork offers the following enhancements: * `mbstring.func_overload` resistance * Unit tests * Composer- and Packagist-ready * Base16 encoding * Base32 encoding * Uses `pack()` and `unpack()` instead of `chr()` and `ord()` ## PHP Version Requirements Version 3 of this library should work on **PHP 8** or newer. Version 2 of this library should work on **PHP 7** or newer. See [the v2.x branch](https://github.com/paragonie/constant_time_encoding/tree/v2.x). For PHP 5 support, see [the v1.x branch](https://github.com/paragonie/constant_time_encoding/tree/v1.x). If you are adding this as a dependency to a project intended to work on PHP 5 through 8.4, please set the required version to `^1|^2|^3`. ## How to Install ```sh composer require paragonie/constant_time_encoding ``` ## How to Use ```php use ParagonIE\ConstantTime\Encoding; // possibly (if applicable): // require 'vendor/autoload.php'; $data = random_bytes(32); echo Encoding::base64Encode($data), "\n"; echo Encoding::base32EncodeUpper($data), "\n"; echo Encoding::base32Encode($data), "\n"; echo Encoding::hexEncode($data), "\n"; echo Encoding::hexEncodeUpper($data), "\n"; ``` Example output: ``` 1VilPkeVqirlPifk5scbzcTTbMT2clp+Zkyv9VFFasE= 2VMKKPSHSWVCVZJ6E7SONRY3ZXCNG3GE6ZZFU7TGJSX7KUKFNLAQ==== 2vmkkpshswvcvzj6e7sonry3zxcng3ge6zzfu7tgjsx7kukfnlaq==== d558a53e4795aa2ae53e27e4e6c71bcdc4d36cc4f6725a7e664caff551456ac1 D558A53E4795AA2AE53E27E4E6C71BDCC4D36CC4F6725A7E664CAFF551456AC1 ``` If you only need a particular variant, you can just reference the required class like so: ```php use ParagonIE\ConstantTime\Base64; use ParagonIE\ConstantTime\Base32; $data = random_bytes(32); echo Base64::encode($data), "\n"; echo Base32::encode($data), "\n"; ``` Example output: ``` 1VilPkeVqirlPifk5scbzcTTbMT2clp+Zkyv9VFFasE= 2vmkkpshswvcvzj6e7sonry3zxcng3ge6zzfu7tgjsx7kukfnlaq==== ``` ## Support Contracts If your company uses this library in their products or services, you may be interested in [purchasing a support contract from Paragon Initiative Enterprises](https://paragonie.com/enterprise).