diff options
Diffstat (limited to 'vendor/paragonie/constant_time_encoding/README.md')
| -rw-r--r-- | vendor/paragonie/constant_time_encoding/README.md | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/vendor/paragonie/constant_time_encoding/README.md b/vendor/paragonie/constant_time_encoding/README.md new file mode 100644 index 0000000..cedddd8 --- /dev/null +++ b/vendor/paragonie/constant_time_encoding/README.md @@ -0,0 +1,84 @@ +# 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 enchancements: + +* `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). |