Man pages matching name crypt::pbkdf2::hash in section 3pm:

Crypt::PBKDF2::Hash.3pm.en	debian 10 / libcrypt-pbkdf2-perl
Crypt::PBKDF2::Hash.3pm.en	debian 11 / libcrypt-pbkdf2-perl
Crypt::PBKDF2::Hash.3pm.en	debian 12 / libcrypt-pbkdf2-perl