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Add host-key document verification support to genprotimg. This ensures that a host-key document is genuine and provided by IBM. For this the user must provide the IBM Z signing key, the intermediate CA certificate (signed by the root CA used) so a chain of trust starting from the host-key document and ending in the root CA can be established. By default, genprotimg tries to download all revocation lists needed by looking up in the corresponding certificate on how CRL information can be obtained (see https://tools.ietf.org/html/rfc5280#section-4.2.1.13 for details). Acked-by: Patrick Steuer <patrick.steuer@de.ibm.com> Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>