Type of host certificate structure that is passed to the check callback
No information about the certificate is available. This may happen when using curl.
The data argument to the callback will be a pointer to the DER-encoded data.
The data argument to the callback will be a pointer to a git_cert_hostkey structure.
The data argument to the callback will be a pointer to a git_strarray with name:content strings containing information about the certificate. This is used when using curl.