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WP stores passwords as MD5 hashes, yes you can use https://codex.wordpress.org/Function_Reference/wp_hash_password and the explanation of how it works on in the codex.
To validate a field you would use an acf/validate_value filter https://www.advancedcustomfields.com/resources/acf-validate_value/
If you want to know how WP generates a password I would start by searching the core files for
function wp_generate_password https://codex.wordpress.org/Function_Reference/wp_generate_password
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