Hi,
thank you for this package. I'm experiencing very very bad performance on PHP 8.0 caused by the XChaCha20 polyfill.

Meanwhile I have recompile a php 8.0 package without libsodium support and installed the very latest pecl-extension from

https://github.com/jedisct1/libsodium-php.git

which has the require PHP binding sodium_crypto_stream_xchacha20_xor. With this setup things are quite fast, where "fast" means roughly 0.05 seconds for 16Mib and "slow" about 12 seconds for the same size. This is for symmetric encryption using the `File::encrypt()' method.

Without streaming (which compresses the data in chunks of 1Mib it seems), that is with the Symmetric\Crypto::encrypt() the thing is hopelessly slow (gave up) while it takes on my system roughly 5 seconds when using the hand-made bleeding edge libsodium bindings.