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

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