Man pages matching name shishi_priv_encprivpart_der_set in section 3:

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