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[Utility & Helpers](/categories/utility) 4. / 5. paragonie/constant\_time\_encoding ActiveLibrary[Utility & Helpers](/categories/utility) paragonie/constant\_time\_encoding ================================== Constant-time Implementations of RFC 4648 Encoding (Base-64, Base-32, Base-16) v3.1.3(7mo ago)903329.7M—3.2%35[1 PRs](https://github.com/paragonie/constant_time_encoding/pulls)20MITPHPPHP ^8CI failing Since Feb 3Pushed 7mo ago12 watchersCompare [ Source](https://github.com/paragonie/constant_time_encoding)[ Packagist](https://packagist.org/packages/paragonie/constant_time_encoding)[ RSS](/packages/paragonie-constant-time-encoding/feed)WikiDiscussions master Synced 1mo ago READMEChangelog (10)Dependencies (4)Versions (44)Used By (20) Constant-Time Encoding ====================== [](#constant-time-encoding) [![Build Status](https://github.com/paragonie/constant_time_encoding/actions/workflows/ci.yml/badge.svg)](https://github.com/paragonie/constant_time_encoding/actions)[![Static Analysis](https://github.com/paragonie/constant_time_encoding/actions/workflows/psalm.yml/badge.svg)](https://github.com/paragonie/constant_time_encoding/actions)[![Latest Stable Version](https://camo.githubusercontent.com/7975edd2d3a93074bc169da4f3b13c29f2fb4d2a10ccf325f3f4fee0a0c62085/68747470733a2f2f706f7365722e707567782e6f72672f70617261676f6e69652f636f6e7374616e745f74696d655f656e636f64696e672f762f737461626c65)](https://packagist.org/packages/paragonie/constant_time_encoding)[![Latest Unstable Version](https://camo.githubusercontent.com/02a3bb29402a0683c25fe889195b06d5dd1ac5c6dee13161ea16fb31698ed842/68747470733a2f2f706f7365722e707567782e6f72672f70617261676f6e69652f636f6e7374616e745f74696d655f656e636f64696e672f762f756e737461626c65)](https://packagist.org/packages/paragonie/constant_time_encoding)[![License](https://camo.githubusercontent.com/b066d92ffa91719f7c794fe5113f4772a338584d477e5462a31e32c634066b9b/68747470733a2f2f706f7365722e707567782e6f72672f70617261676f6e69652f636f6e7374616e745f74696d655f656e636f64696e672f6c6963656e7365)](https://packagist.org/packages/paragonie/constant_time_encoding)[![Downloads](https://camo.githubusercontent.com/8a1fa506d31940949dbced9e6e1516928e2ad6d3f9f1625d0943ee1f8ef415ea/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f64742f70617261676f6e69652f636f6e7374616e745f74696d655f656e636f64696e672e737667)](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 ------------------------ [](#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 -------------- [](#how-to-install) ``` composer require paragonie/constant_time_encoding ``` How to Use ---------- [](#how-to-use) ``` 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: ``` 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 ----------------- [](#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). ### Health Score 68 — FairBetter than 100% of packages Maintenance62 Regular maintenance activity Popularity78 Solid adoption and visibility Community44 Growing community involvement Maturity76 Established project with proven stability Bus Factor1 Top contributor holds 64.4% 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 Every ~88 days Recently: every ~0 days Total 41 Last Release 237d ago Major Versions v1.0.4 → v2.2.32019-01-03 v1.1.0 → v2.5.02022-01-17 v2.7.0 → v3.0.02024-05-08 v2.8.0 → v3.1.12025-09-22 v2.8.1 → v3.1.32025-09-24 PHP version history (6 changes)0.1.0PHP ^5.5|^7 v0.4.0PHP ^5.3|^7 v2.0.0PHP ^7 v2.3.0PHP ^7|^8 v1.x-devPHP ^5.3|^7|^8 v3.0.0PHP ^8 ### Community Maintainers ![](https://www.gravatar.com/avatar/05d241256cda885139a5697d3bb536b5cec3b430c1adb9c524bf92a37a55758d?d=identicon)[paragonie-scott](/maintainers/paragonie-scott) --- Top Contributors [![paragonie-security](https://avatars.githubusercontent.com/u/15914520?v=4)](https://github.com/paragonie-security "paragonie-security (103 commits)")[![paragonie-scott](https://avatars.githubusercontent.com/u/11591518?v=4)](https://github.com/paragonie-scott "paragonie-scott (26 commits)")[![TimWolla](https://avatars.githubusercontent.com/u/209270?v=4)](https://github.com/TimWolla "TimWolla (16 commits)")[![peldax](https://avatars.githubusercontent.com/u/10790033?v=4)](https://github.com/peldax "peldax (2 commits)")[![inkeliz](https://avatars.githubusercontent.com/u/4644332?v=4)](https://github.com/inkeliz "inkeliz (1 commits)")[![jdreesen](https://avatars.githubusercontent.com/u/424602?v=4)](https://github.com/jdreesen "jdreesen (1 commits)")[![krsriq](https://avatars.githubusercontent.com/u/2337648?v=4)](https://github.com/krsriq "krsriq (1 commits)")[![michaeldyrynda](https://avatars.githubusercontent.com/u/558441?v=4)](https://github.com/michaeldyrynda "michaeldyrynda (1 commits)")[![nikanderson](https://avatars.githubusercontent.com/u/17752261?v=4)](https://github.com/nikanderson "nikanderson (1 commits)")[![SharkMachine](https://avatars.githubusercontent.com/u/7488694?v=4)](https://github.com/SharkMachine "SharkMachine (1 commits)")[![systemsolutionweb](https://avatars.githubusercontent.com/u/88460896?v=4)](https://github.com/systemsolutionweb "systemsolutionweb (1 commits)")[![szepeviktor](https://avatars.githubusercontent.com/u/952007?v=4)](https://github.com/szepeviktor "szepeviktor (1 commits)")[![Chris8934](https://avatars.githubusercontent.com/u/44963939?v=4)](https://github.com/Chris8934 "Chris8934 (1 commits)")[![tvlooy](https://avatars.githubusercontent.com/u/391674?v=4)](https://github.com/tvlooy "tvlooy (1 commits)")[![erikn69](https://avatars.githubusercontent.com/u/4933954?v=4)](https://github.com/erikn69 "erikn69 (1 commits)")[![Grundik](https://avatars.githubusercontent.com/u/220951?v=4)](https://github.com/Grundik "Grundik (1 commits)")[![hansott](https://avatars.githubusercontent.com/u/3886384?v=4)](https://github.com/hansott "hansott (1 commits)") --- Tags base16base32base32hexbase64base64-urlsafebase64urlcache-timing-safecharacter-encodingconstant-timeencodinghexadecimalphprfc-4648url-safeurlsafeencodingbase64rfc4648base32hexbase16bin2hexhex2binbase64\_encodebase64\_decodebase32\_encodebase32\_decode ### Code Quality TestsPHPUnit Static AnalysisPsalm Type Coverage Yes ### Embed Badge ![Health badge](/badges/paragonie-constant-time-encoding/health.svg) ``` [![Health](https://phpackages.com/badges/paragonie-constant-time-encoding/health.svg)](https://phpackages.com/packages/paragonie-constant-time-encoding) ``` ### Alternatives [spomky-labs/base64url Base 64 URL Safe Encoding/Decoding PHP Library 15439.5M49](/packages/spomky-labs-base64url)[christian-riesen/base32 Base32 encoder/decoder according to RFC 4648 13331.8M61](/packages/christian-riesen-base32)[xobotyi/basen Text and integers encoding utilities for PHP with no extensions dependencies. 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