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[Utility & Helpers](/categories/utility) 4. / 5. phpseclib/phpseclib2\_compat ActiveLibrary[Utility & Helpers](/categories/utility) phpseclib/phpseclib2\_compat ============================ phpseclib 2.0 polyfill built with phpseclib 3.0 1.0.10(2w ago)132.1M↓38%612MITPHPCI failing Since Dec 19Pushed 2w ago1 watchersCompare [ Source](https://github.com/phpseclib/phpseclib2_compat)[ Packagist](https://packagist.org/packages/phpseclib/phpseclib2_compat)[ Docs](https://github.com/phpseclib/phpseclib2_compat)[ RSS](/packages/phpseclib-phpseclib2-compat/feed)WikiDiscussions master Synced yesterday READMEChangelog (10)Dependencies (8)Versions (13)Used By (12) phpseclib2\_compat ================== [](#phpseclib2_compat) [![CI Status](https://github.com/phpseclib/phpseclib2_compat/actions/workflows/ci.yml/badge.svg?branch=master&event=push "CI Status")](https://github.com/phpseclib/phpseclib2_compat/actions/workflows/ci.yml?query=branch%3Amaster) phpseclib 2.0 polyfill built with phpseclib 3.0 Overview -------- [](#overview) phpseclib 3.0 breaks backwards compatability with phpseclib 2.0. Most notably, public keys work completely differently. So let's say you wanted to use phpseclib 3.0 whilst some of your other dependencies still use phpseclib 2.0. What would you do in that instance? That's where phpseclib2\_compat comes into play. Require phpseclib/phpseclib:~3.0 and phpseclib/phpseclib2\_compat:~1.0 and your dependencies will magically start using phpseclib 3.0 even if they don't know it. Using phpseclib2\_compat will actually bring a few enhancements to your dependencies. For example, while phpseclib 2.0 only supports RSA keys phpseclib2\_compat sports support for ECDSA / DSA / Ed25519 / Ed449 keys. Consider this code sample: ``` use phpseclib\Crypt\RSA; $rsa = new RSA; $rsa->loadKey('ecdsa private key'); $ssh = new SSH2('website.com'); $ssh->login('username', $rsa); ``` That'll work with phpseclib2\_compat, even with an ECDSA private key, whereas in phpseclib 2.0 it would not work. SSH1 and SCP are not supported but those were likely never frequently used anyway. Using the old cipher suite -------------------------- [](#using-the-old-cipher-suite) phpseclib 3.0 uses a different cipher suite (an expanded one) than 2.0. If this causes you issues you can use the 2.0 ciphersuite by doing this prior to calling `$ssh->login()`: ``` $methods = [ 'crypt' => array_intersect([ 'arcfour256', 'arcfour128', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'twofish128-ctr', 'twofish192-ctr', 'twofish256-ctr', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc', 'twofish128-cbc', 'twofish192-cbc', 'twofish256-cbc', 'twofish-cbc', 'blowfish-ctr', 'blowfish-cbc', '3des-ctr', '3des-cbc' ], $ssh->getSupportedEncryptionAlgorithms()), 'mac' => [ 'hmac-sha2-256', 'hmac-sha1-96', 'hmac-sha1', 'hmac-md5-96', 'hmac-md5' ], 'comp' => ['none'] ]; $ssh->setPreferredAlgorithms([ 'kex' => [ 'curve25519-sha256@libssh.org', 'diffie-hellman-group-exchange-sha256', 'diffie-hellman-group-exchange-sha1', 'diffie-hellman-group14-sha1', 'diffie-hellman-group14-sha256' ], 'hostkey' => [ 'rsa-sha2-256', 'rsa-sha2-512', 'ssh-rsa', 'ssh-dss' ], 'client_to_server' => $methods, 'server_to_client' => $methods ]); ``` Installation ------------ [](#installation) With [Composer](https://getcomposer.org/): ``` composer require phpseclib/phpseclib2_compat:~1.0 ``` ### Health Score 61 — FairBetter than 99% of packages Maintenance96 Actively maintained with recent releases Popularity50 Moderate usage in the ecosystem Community26 Small or concentrated contributor base Maturity61 Established project with proven stability Bus Factor1 Top contributor holds 95.2% 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 ~182 days Recently: every ~21 days Total 12 Last Release 17d ago ### Community Maintainers ![](https://www.gravatar.com/avatar/1214cf33299ce51f30c9c199cf3b55e8630cc16d5df714c551407088937e9988?d=identicon)[terrafrost](/maintainers/terrafrost) --- Top Contributors [![terrafrost](https://avatars.githubusercontent.com/u/214474?v=4)](https://github.com/terrafrost "terrafrost (80 commits)")[![adriano66](https://avatars.githubusercontent.com/u/3438696?v=4)](https://github.com/adriano66 "adriano66 (1 commits)")[![bilogic](https://avatars.githubusercontent.com/u/946010?v=4)](https://github.com/bilogic "bilogic (1 commits)")[![dhedberg](https://avatars.githubusercontent.com/u/279067?v=4)](https://github.com/dhedberg "dhedberg (1 commits)")[![jonlee90](https://avatars.githubusercontent.com/u/17611175?v=4)](https://github.com/jonlee90 "jonlee90 (1 commits)") ### Code Quality TestsPHPUnit ### Embed Badge ![Health badge](/badges/phpseclib-phpseclib2-compat/health.svg) ``` [![Health](https://phpackages.com/badges/phpseclib-phpseclib2-compat/health.svg)](https://phpackages.com/packages/phpseclib-phpseclib2-compat) ``` ### Alternatives [civicrm/civicrm-core Open source constituent relationship management for non-profits, NGOs and advocacy organizations. 751291.4k40](/packages/civicrm-civicrm-core)[phpseclib/mcrypt_compat PHP 5.x-8.x polyfill for mcrypt extension 28131.4M42](/packages/phpseclib-mcrypt-compat)[akeneo/pim-community-dev Akeneo PIM, the future of catalog management is open! 1.0k624.1k85](/packages/akeneo-pim-community-dev)[shopware/core Shopware platform is the core for all Shopware ecommerce products. 585.6M560](/packages/shopware-core)[shopware/app-php-sdk Shopware App SDK for PHP 15109.8k3](/packages/shopware-app-php-sdk)[n1ebieski/ksef-php-client PHP API client that allows you to interact with the API Krajowego Systemu e-Faktur 9067.8k](/packages/n1ebieski-ksef-php-client) PHPackages © 2026 [Directory](/)[Categories](/categories)[Trending](/trending)[Changelog](/changelog)[Analyze](/analyze)