PHP 5.x-8.x polyfill for mcrypt extension.

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With Composer:

composer require phpseclib/mcrypt_compat

• rijndael-128
• rijndael-192
• rijndael-256
• des
• blowfish
• rc2
• tripledes
• arcfour

• cast-128
• gost
• cast-256
• loki97
• saferplus
• wake
• blowfish-compat
• serpent
• xtea
• enigma

• cbc
• ncfb
• cfb
• ctr
• ecb
• nofb
• ofb
• stream

mcrypt_compat's ncfb implementation has some incompatibles with mcrypt's implementation where mcrypt_generic and mdecrypt_generic are concerned. The unit tests elaborate.

The mcrypt extension's behavior underwent changes as new versions of PHP were released. By default mcrypt_compat emulates the behavior of PHP 7.1 but if you need to emulate how mcrypt behaved in, say, PHP 5.3.0, you may do so by doing define('PHPSECLIB_MCRYPT_TARGET_VERSION', '5.3.0'); before including vendor/autoload.php (if you're using this with Composer).

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