Man pages matching name shishi_ap_authenticator_cksumdata in section 3:

shishi_ap_authenticator_cksumdata.3.en	debian 10 / shishi-doc
shishi_ap_authenticator_cksumdata.3.en	debian 11 / shishi-doc
shishi_ap_authenticator_cksumdata.3.en	debian 12 / shishi-doc