WordPress plugins are the core to most websites. As such, they’re also the most common target for malicious attacks. The wp-md5 WordPress plugin checksum database can be used to compare good, known md5 checksums to the checksums of the plugin files on your server. The md5sum of every plugin on WordPress.org is available here, and can be accessed in an automated manner by using the following url scheme:
https://wpmd5.mattjung.net/plugin/plugin_slug/plugin_version/
So for example, to get the md5sums of the files for WooCommerce 3.8.1, you would access them at the following location:
https://wpmd5.mattjung.net/plugin/woocommerce/3.8.1/
You can also browse all plugin checkums here.