layer.conf gpg boot key sample: Add the gpg boot key sample files

Sample keys are required in order for the signing to succeed when
using grub boot verification.  The keys are only used when
GRUB_SIGN_VERIFY = "1", and it is intended that and user would
generate new keys with the create-user-key-store.sh.

[ Issue: LINUXEXEC-2450 ]

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

meta-signing-key/conf/layer.conf

@@ -23,6 +23,7 @@ SAMPLE_SECONDARY_TRUSTED_KEYS_DIR = "${LAYERDIR}/files/secondary_trusted_keys"
 SAMPLE_MODSIGN_KEYS_DIR = "${LAYERDIR}/files/modsign_keys"
 SAMPLE_IMA_KEYS_DIR = "${LAYERDIR}/files/ima_keys"
 SAMPLE_RPM_KEYS_DIR = "${LAYERDIR}/files/rpm_keys"
+SAMPLE_BOOT_KEYS_DIR = "${LAYERDIR}/files/boot_keys"
 
 # Microsoft certificates
 MSFT_DB_CERT = "${LAYERDIR}/files/uefi_sb_keys/ms-DB.crt"
@@ -37,6 +38,9 @@ UEFI_SELOADER ??= "1"
 # Use gpg key to protect and verify all files used by grub
 GRUB_SIGN_VERIFY ??= "0"
 
+# Signing file extension
+SB_FILE_EXT = "${@'.p7b' if d.getVar('UEFI_SELOADER', True) == "1" else '.sig'}"
+
 # By default the sample keys are used
 MOK_SB_KEYS_DIR ??= "${SAMPLE_MOK_SB_KEYS_DIR}"
 UEFI_SB_KEYS_DIR ??= "${SAMPLE_UEFI_SB_KEYS_DIR}"
@@ -45,6 +49,8 @@ SECONDARY_TRUSTED_KEYS_DIR ??= "${SAMPLE_SECONDARY_TRUSTED_KEYS_DIR}"
 MODSIGN_KEYS_DIR ??= "${SAMPLE_MODSIGN_KEYS_DIR}"
 IMA_KEYS_DIR ??= "${SAMPLE_IMA_KEYS_DIR}"
 RPM_KEYS_DIR ??= "${SAMPLE_RPM_KEYS_DIR}"
+BOOT_KEYS_DIR ??= "${SAMPLE_BOOT_KEYS_DIR}"
+GRUB_PUB_KEY ??= "${BOOT_KEYS_DIR}/boot_pub_key"
 
 # Define the identification of vendor
 VENDOR_UUID = "1f7b9654-2107-4697-8f1c-0cbc38874588"
@@ -55,6 +61,8 @@ UEFI_SIG_OWNER_GUID ??= "${VENDOR_UUID}"
 SAMPLE_RPM_KEYNAME ??= "SecureCore"
 RPM_GPG_NAME ??= "${SAMPLE_RPM_KEYNAME}"
 RPM_GPG_PASSPHRASE ??= "SecureCore"
+BOOT_GPG_NAME ??= "SecureBootCore"
+BOOT_GPG_PASSPHRASE ??= "SecureCore"
 
 BB_HASHBASE_WHITELIST_append += "\
     SYSTEM_TRUSTED_KEYS_DIR \

meta-signing-key/files/boot_keys/BOOT-GPG-KEY-SecureBootCore

@@ -0,0 +1,29 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mQINBF2yGpkBEADSQX70Xp9k5z+i+7aZ8hz9wLeZpZkGqQkXiR26RnUrr3aQkasS
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+/OnVLEB0QhVQ0BnJYY5PrYGpgmo=
+=LD8N
+-----END PGP PUBLIC KEY BLOCK-----

meta-signing-key/files/boot_keys/BOOT-GPG-PRIVKEY-SecureBootCore

@@ -0,0 +1,57 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+
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+=vO+l
+-----END PGP PRIVATE KEY BLOCK-----

meta-signing-key/files/boot_keys/boot_cfg_pw

@@ -0,0 +1 @@
+grub.pbkdf2.sha512.10000.2ACE2378DE516E00A6722F4277A8D2573E252FE6EC2B768922849AFDDEC0AB87D0CA25951E572A0754540339EB4F45A6F7CD5C6F20823F75F268C823B3997237.9A9EB552ABB428FB82CE7351787FC225BCB13B1542C82B582D40424FF1BF4B292B547EE51F7495C9D3BEC51BAA008D7F2D1B8F533F7337B98DE74FD510948F04