phpseclib/phpseclib

PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.

3.0.52 2026-04-27 07:02 UTC

Requires

• php: >=5.6.1
• paragonie/constant_time_encoding: ^1|^2|^3
• paragonie/random_compat: ^1.4|^2.0|^9.99.99

Requires (Dev)

• phpunit/phpunit: *

Suggests

• ext-dom: Install the DOM extension to load XML formatted public keys.
• ext-gmp: Install the GMP (GNU Multiple Precision) extension in order to speed up arbitrary precision integer arithmetic operations.
• ext-libsodium: SSH2/SFTP can make use of some algorithms provided by the libsodium-php extension.
• ext-mcrypt: Install the Mcrypt extension in order to speed up a few other cryptographic operations.
• ext-openssl: Install the OpenSSL extension in order to speed up a wide variety of cryptographic operations.

MIT

• Jim Wigginton
• Patrick Monnerat
• Andreas Fischer
• Hans-Jürgen Petrich
• Graham Campbell

• security
• cryptography
• ssh
• encryption
• blowfish
• crypto
• signature
• signing
• rsa
• aes
• sftp
• x509
• x.509
• asn1
• asn.1
• BigInteger
• twofish

README

Supporting phpseclib

• Become a backer or sponsor on Patreon
• One-time donation via PayPal or crypto-currencies
• Subscribe to Tidelift

Introduction

MIT-licensed pure-PHP implementations of the following:

SSH-2, SFTP, X.509, an arbitrary-precision integer arithmetic library, Ed25519 / Ed449 / Curve25519 / Curve449, ECDSA / ECDH (with support for 66 curves), RSA (PKCS#1 v2.2 compliant), DSA / DH, DES / 3DES / RC4 / Rijndael / AES / Blowfish / Twofish / Salsa20 / ChaCha20, GCM / Poly1305

• Browse Git

Documentation

• Documentation / Manual
• API Documentation (generated by Doctum)

Branches

master

• Development Branch
• Unstable API
• Do not use in production

4.0

• Expected Release Date: September 2026
• Long term support (LTS) release
• X509 split into separate X509, CRL, CSR and SPKAC classes
• PFX and CMS classes added
• All ASN1 classes are lazy loaded by default
• Minimum PHP version: 8.1.0
• PSR-4 autoloading with namespace rooted at \phpseclib4
• Install via Composer: composer require phpseclib/phpseclib:4.0.x-dev

3.0

• Long term support (LTS) release
• Major expansion of cryptographic primitives
• Minimum PHP version: 5.6.1
• PSR-4 autoloading with namespace rooted at \phpseclib3
• Install via Composer: composer require phpseclib/phpseclib:~3.0

2.0

• Long term support (LTS) release
• Modernized version of 1.0
• Minimum PHP version: 5.3.3
• PSR-4 autoloading with namespace rooted at \phpseclib
• Install via Composer: composer require phpseclib/phpseclib:~2.0

1.0

• Long term support (LTS) release
• PHP4 compatible
• Composer compatible (PSR-0 autoloading)
• Install using Composer: composer require phpseclib/phpseclib:~1.0
• Download 1.0.25 as ZIP

Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

Support

Need Support?

• Checkout Questions and Answers on Stack Overflow
• Create a Support Ticket on GitHub

Special Thanks

Additional Thanks

• Allan Simon
• Anna Filina
• delovelady
• ChargeOver
• 

Contributing

1. Fork the Project

2. Ensure you have Composer installed (see Composer Download Instructions)

3. Install Development Dependencies

   composer install

4. Create a Feature Branch

5. Run continuous integration checks:

   composer run-script all-quality-tools

6. Send us a Pull Request