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[Utility & Helpers](/categories/utility) 4. / 5. skywalker-labs/constant-time-encoding ActiveLibrary[Utility & Helpers](/categories/utility) skywalker-labs/constant-time-encoding ===================================== Constant-time implementations of RFC 4648 encoding (Base64, Base32, Hex) and other variants (Base64UrlSafe, Base64DotSlash, Base32Hex) v1.0.0(4mo ago)111MITPHPPHP ^7.4 || ^8.0 || ^9.0CI passing Since Feb 15Pushed 4mo agoCompare [ Source](https://github.com/skywalker-labs/constant-time-encoding)[ Packagist](https://packagist.org/packages/skywalker-labs/constant-time-encoding)[ Docs](https://github.com/skywalker-labs/constant-time-encoding)[ GitHub Sponsors](https://github.com/sponsors/ermradulsharma)[ RSS](/packages/skywalker-labs-constant-time-encoding/feed)WikiDiscussions main Synced today READMEChangelog (1)Dependencies (4)Versions (2)Used By (1) Skywalker Constant-Time Encoding ================================ [](#skywalker-constant-time-encoding) [![Build Status](https://github.com/skywalker-labs/constant-time-encoding/actions/workflows/ci.yml/badge.svg)](https://github.com/skywalker-labs/constant-time-encoding/actions)[![Static Analysis](https://github.com/skywalker-labs/constant-time-encoding/actions/workflows/psalm.yml/badge.svg)](https://github.com/skywalker-labs/constant-time-encoding/actions)[![Latest Stable Version](https://camo.githubusercontent.com/a2e77a463b09363fec6d9a449d9b6d986ce29ecde0409f60d49d563d26f207ac/68747470733a2f2f706f7365722e707567782e6f72672f736b7977616c6b65722d6c6162732f636f6e7374616e742d74696d652d656e636f64696e672f762f737461626c65)](https://packagist.org/packages/skywalker-labs/constant-time-encoding)[![Latest Unstable Version](https://camo.githubusercontent.com/35062f4b711cafb1621ddd70b654e72f36bc4ad7409f20b33994fcc321c6e27a/68747470733a2f2f706f7365722e707567782e6f72672f736b7977616c6b65722d6c6162732f636f6e7374616e742d74696d652d656e636f64696e672f762f756e737461626c65)](https://packagist.org/packages/skywalker-labs/constant-time-encoding)[![License](https://camo.githubusercontent.com/08ca50265a185eab83e92ace4db64f76096751cd41b85c0b6e95a79de4dcb69c/68747470733a2f2f706f7365722e707567782e6f72672f736b7977616c6b65722d6c6162732f636f6e7374616e742d74696d652d656e636f64696e672f6c6963656e7365)](https://packagist.org/packages/skywalker-labs/constant-time-encoding)[![Downloads](https://camo.githubusercontent.com/e5b1aa13dc3bebc1b9bb760f2ac98e558b04507ec8a6ee166025af5bdc070ec9/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f64742f736b7977616c6b65722d6c6162732f636f6e7374616e742d74696d652d656e636f64696e672e737667)](https://packagist.org/packages/skywalker-labs/constant-time-encoding) Constant-time implementations of RFC 4648 encoding (Base64, Base32, Hex) and other variants. This library aims to offer character encoding functions that do not leak information about what you are encoding/decoding via processor cache misses. Features -------- [](#features) - **Constant-Time Encoding/Decoding**: Prevents cache-timing attacks. - **Multiple Encodings**: - **Base64** (RFC 4648) - **Base64UrlSafe** (URL-safe variant) - **Base64DotSlash** (Crypt version, `./[A-Z][a-z][0-9]`) - **Base64DotSlashOrdered** (Ordered variant, `[.-9][A-Z][a-z]`) - **Base32** (RFC 4648) - **Base32Hex** (RFC 4648 base32hex) - **Hex** (Base16) - **Security**: Uses `pack()` and `unpack()` instead of `chr()` and `ord()` for safer bit manipulation. - **Robust**: Strict padding validation (optional). Requirements ------------ [](#requirements) - PHP 7.4 or newer (including PHP 8.x). Installation ------------ [](#installation) ``` composer require skywalker-labs/constant-time-encoding ``` Usage ----- [](#usage) You can use the `Skywalker\ConstantTime\Encoding` class as a facade for all encoding methods, or use specific classes directly. ### Using the Encoding Facade [](#using-the-encoding-facade) ``` use Skywalker\ConstantTime\Encoding; // Sample data $data = random_bytes(32); // Base64 echo Encoding::base64Encode($data), "\n"; // Base32 (Uppercase) echo Encoding::base32EncodeUpper($data), "\n"; // Base32 (Standard) echo Encoding::base32Encode($data), "\n"; // Hex (Base16) echo Encoding::hexEncode($data), "\n"; echo Encoding::hexEncodeUpper($data), "\n"; ``` ### Using Specific Classes [](#using-specific-classes) If you only need a specific encoding, you can import the relevant class directly: ``` use Skywalker\ConstantTime\Base64; use Skywalker\ConstantTime\Base32; use Skywalker\ConstantTime\Hex; $data = random_bytes(32); // Encode $b64 = Base64::encode($data); $b32 = Base32::encode($data); $hex = Hex::encode($data); // Decode $raw = Base64::decode($b64); ``` ### Output Example [](#output-example) ``` 1VilPkeVqirlPifk5scbzcTTbMT2clp+Zkyv9VFFasE= 2VMKKPSHSWVCVZJ6E7SONRY3ZXCNG3GE6ZZFU7TGJSX7KUKFNLAQ==== 2vmkkpshswvcvzj6e7sonry3zxcng3ge6zzfu7tgjsx7kukfnlaq==== d558a53e4795aa2ae53e27e4e6c71bcdc4d36cc4f6725a7e664caff551456ac1 D558A53E4795AA2AE53E27E4E6C71BDCC4D36CC4F6725A7E664CAFF551456AC1 ``` Security -------- [](#security) This library was designed to eliminate cache-timing side-channels from encoding operations. It is intended for use in cryptographic contexts where timing leaks could expose sensitive data. Support ------- [](#support) If your company uses this library in their products or services, you may be interested in [purchasing a support contract from Skywalker Labs](https://skywalker-labs.com/). License ------- [](#license) This project is licensed under the MIT License - see the [LICENSE.txt](LICENSE.txt) file for details. ### Health Score 37 — LowBetter than 81% of packages Maintenance76 Regular maintenance activity Popularity3 Limited adoption so far Community8 Small or concentrated contributor base Maturity52 Maturing project, gaining track record Bus Factor1 Top contributor holds 100% of commits — single point of failure How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window. **Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores. **Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement. **Maturity (30%)** — Project age, version count, PHP version support, and release stability. ### Release Activity Cadence Unknown Total 1 Last Release 138d ago ### Community Maintainers ![](https://www.gravatar.com/avatar/68241409c48fd5184c979320937b363826a5a9aeeb4260e8d1fa753be39458b9?d=identicon)[ermradulsharma](/maintainers/ermradulsharma) --- Top Contributors [![ermradulsharma](https://avatars.githubusercontent.com/u/15956546?v=4)](https://github.com/ermradulsharma "ermradulsharma (3 commits)") --- Tags encodingbase64rfc4648base32hexbase16bin2hexhex2binbase64\_encodebase64\_decodebase32\_encodebase32\_decode ### Code Quality TestsPHPUnit Static AnalysisPsalm Type Coverage Yes ### Embed Badge ![Health badge](/badges/skywalker-labs-constant-time-encoding/health.svg) ``` [![Health](https://phpackages.com/badges/skywalker-labs-constant-time-encoding/health.svg)](https://phpackages.com/packages/skywalker-labs-constant-time-encoding) ``` ### Alternatives [paragonie/constant_time_encoding Constant-time Implementations of RFC 4648 Encoding (Base-64, Base-32, Base-16) 908363.2M190](/packages/paragonie-constant-time-encoding)[spomky-labs/base64url Base 64 URL Safe Encoding/Decoding PHP Library 15442.9M61](/packages/spomky-labs-base64url)[christian-riesen/base32 Base32 encoder/decoder according to RFC 4648 13333.9M74](/packages/christian-riesen-base32)[xobotyi/basen Text and integers encoding utilities for PHP with no extensions dependencies. 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