Man pages matching name crypt::dh::gmp in section 3pm:

Crypt::DH::GMP.3pm.en	debian 10 / libcrypt-dh-gmp-perl
Crypt::DH::GMP.3pm.en	debian 11 / libcrypt-dh-gmp-perl
Crypt::DH::GMP.3pm.en	debian 12 / libcrypt-dh-gmp-perl