Magento 2.4.x issues related to SODIUM on Xampp
After installing Xampp (PHP v8.1.x) on Windows, you may face the issues related to sodium extension with Magento 2.4.5 or Magento 2.4.6, the error is like:
main.CRITICAL: Error: Undefined constant "Magento\Framework\Encryption\Adapter\SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES"
it's because sodium extension is not loaded.
How to fix this issue
1. Go to php.ini file, find "extension=sodium" then uncomment it by removing the semicolon (;)
2. Copy libsodium.dll file in xampp/php/ then put it to xampp/apache/bin/
3. Restart Apache
You need to run phpinfo() to check the results. Find the table of sodium support, you will see the table like below screenshot