Application Gateway: publicCertData What is is?

I see that resource manager does expose the public cert for the Application Gateway. This is could be useful for say fixing https://github.com/terraform-providers/terraform-provider-azurerm/issues/583. Potential, locally we'd be able to extract the public information and do a comparison.

I guess to work with it i am wondering what format this follows? PKCS##?

Rerence: https://github.com/Azure/azure-rest-api-specs/blob/d222b8d36a420a9164239a61d8373e765763e842/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/applicationGateway.json#L876

Start with specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/applicationGateway.json at the referenced line and inspect the publicCertData property and its surrounding schema. Check the linked Azure resource-manager definition or related specifications to determine the certificate encoding, then document the format and its intended use if the repository provides a suitable location.

Written by the indexing model from the issue text.