Hostkey hash. If type has git_cert_ssh_t.GIT_CERT_SSH_MD5 set, this will have the MD5 hash of the hostkey.
Hostkey hash. If type has git_cert_ssh_t.GIT_CERT_SSH_SHA1 set, this will have the SHA-1 hash of the hostkey.
Hostkey hash. If type has GIT_CERT_SSH_SHA256 set, this will have the SHA-256 hash of the hostkey.
The parent cert
A hostkey type from libssh2, either git_cert_ssh_t.GIT_CERT_SSH_MD5 or git_cert_ssh_t.GIT_CERT_SSH_SHA1
Hostkey information taken from libssh2