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| .editorconfig | 258 KB | August 13 2024 21:03:02 | 0770 |
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| .env | 1340 KB | November 09 2024 13:13:00 | 0770 |
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| .env.example | 1213 KB | August 13 2024 21:03:02 | 0770 |
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| .gitattributes | 186 KB | August 13 2024 21:03:02 | 0770 |
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| .htaccess | 466 KB | August 13 2024 21:03:02 | 0770 |
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| .well-known | - | July 10 2025 23:46:46 | 0750 |
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| 11.php | 70548 KB | July 01 2025 20:07:37 | 0644 |
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| Modules | - | November 04 2024 11:42:06 | 0755 |
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| README.md | 80 KB | August 13 2024 21:03:02 | 0770 |
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| admin-link.php | 17837 KB | July 21 2025 17:21:09 | 0644 |
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| artisan | 1686 KB | August 13 2024 21:03:02 | 0770 |
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| aws.php | 188721 KB | July 21 2025 17:21:09 | 0644 |
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| bootstrap | - | November 04 2024 11:38:26 | 0777 |
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| composer.json | 2932 KB | September 19 2024 12:33:02 | 0770 |
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| composer.lock | 415525 KB | September 19 2024 12:33:02 | 0770 |
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| config | - | July 02 2025 03:17:17 | 0777 |
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| index.php | 13824 KB | July 02 2025 01:57:55 | 0770 |
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| ktq.txt | 1 KB | July 02 2025 01:58:01 | 0644 |
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| postcss.config.js | 93 KB | August 13 2024 21:03:02 | 0770 |
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| robots.txt | 986 KB | July 23 2025 15:34:18 | 0644 |
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| server.php | 541 KB | August 13 2024 21:03:04 | 0770 |
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| ss.php | 17569 KB | July 02 2025 03:06:06 | 0644 |
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| storage | - | November 04 2024 11:42:08 | 0755 |
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| tailwind.config.js | 541 KB | August 13 2024 21:03:04 | 0770 |
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| tmp.zip | 3878 KB | July 21 2025 17:21:09 | 0644 |
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| vite-module-loader.js | 1397 KB | August 13 2024 21:03:06 | 0770 |
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# Constant-Time Encoding
[](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 2 of this library should work on **PHP 7** or newer. 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 both PHP 5 and PHP 7, please set the required version to `^1|^2` instead of just `^1` or `^2`.
## 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).