menu "Certificates for signature checking"
  
  config MODULE_SIG_KEY
  	string "File name or PKCS#11 URI of module signing key"
  	default "certs/signing_key.pem"
  	depends on MODULE_SIG
  	help
           Provide the file name of a private key/certificate in PEM format,
           or a PKCS#11 URI according to RFC7512. The file should contain, or
           the URI should identify, both the certificate and its corresponding
           private key.
  
           If this option is unchanged from its default "certs/signing_key.pem",
           then the kernel will automatically generate the private key and
           certificate as described in Documentation/module-signing.txt
  
  config SYSTEM_TRUSTED_KEYRING
  	bool "Provide system-wide ring of trusted keys"
  	depends on KEYS

  	depends on ASYMMETRIC_KEY_TYPE

  	help
  	  Provide a system keyring to which trusted keys can be added.  Keys in
  	  the keyring are considered to be trusted.  Keys may be added at will
  	  by the kernel from compiled-in data and from hardware key stores, but
  	  userspace may only add extra keys if those keys can be verified by
  	  keys already in the keyring.
  
  	  Keys in this keyring are used by module signature checking.
  
  config SYSTEM_TRUSTED_KEYS
  	string "Additional X.509 keys for default system keyring"
  	depends on SYSTEM_TRUSTED_KEYRING
  	help
  	  If set, this option should be the filename of a PEM-formatted file
  	  containing trusted X.509 certificates to be included in the default
  	  system keyring. Any certificate used for module signing is implicitly
  	  also trusted.
  
  	  NOTE: If you previously provided keys for the system keyring in the
  	  form of DER-encoded *.x509 files in the top-level build directory,
  	  those are no longer used. You will need to set this option instead.

  config SYSTEM_EXTRA_CERTIFICATE
  	bool "Reserve area for inserting a certificate without recompiling"
  	depends on SYSTEM_TRUSTED_KEYRING
  	help
  	  If set, space for an extra certificate will be reserved in the kernel
  	  image. This allows introducing a trusted certificate to the default
  	  system keyring without recompiling the kernel.
  
  config SYSTEM_EXTRA_CERTIFICATE_SIZE
  	int "Number of bytes to reserve for the extra certificate"
  	depends on SYSTEM_EXTRA_CERTIFICATE
  	default 4096
  	help
  	  This is the number of bytes reserved in the kernel image for a
  	  certificate to be inserted.

  config SECONDARY_TRUSTED_KEYRING
  	bool "Provide a keyring to which extra trustable keys may be added"
  	depends on SYSTEM_TRUSTED_KEYRING
  	help
  	  If set, provide a keyring to which extra keys may be added, provided
  	  those keys are not blacklisted and are vouched for by a key built
  	  into the kernel or already in the secondary trusted keyring.

  endmenu