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kernel-fitimage: generate openssl RSA keys for signing fitimage

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The keys are only generated if they dont exist. The key
generation can be turned off by setting FIT_GENERATE_KEYS to "0".
The default key length for private keys is 2048 and the default
format for public key certificate is x.509.

(From OE-Core rev: 8dfaf5cd4eb5c8e352e7833ec47db1a14ea58b47)

Signed-off-by: Usama Arif <usama.arif@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Usama Arif
2020-09-30 11:48:00 +01:00
committed by Richard Purdie
parent a6b78aa254
commit e65267d376
1 changed files with 44 additions and 0 deletions
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meta/classes/kernel-fitimage.bbclass
+44
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@@ -56,6 +56,22 @@ FIT_HASH_ALG ?= "sha256"
# fitImage Signature Algo
FIT_SIGN_ALG ?= "rsa2048"
# Generate keys for signing fitImage
FIT_GENERATE_KEYS ?= "0"
# Size of private key in number of bits
FIT_SIGN_NUMBITS ?= "2048"
# args to openssl genrsa (Default is just the public exponent)
FIT_KEY_GENRSA_ARGS ?= "-F4"
# args to openssl req (Default is -batch for non interactive mode and
# -new for new certificate)
FIT_KEY_REQ_ARGS ?= "-batch -new"
# Standard format for public key certificate
FIT_KEY_SIGN_PKCS ?= "-x509"
#
# Emit the fitImage ITS header
#
@@ -522,6 +538,34 @@ do_assemble_fitimage_initramfs() {
addtask assemble_fitimage_initramfs before do_deploy after do_bundle_initramfs
do_generate_rsa_keys() {
if [ "${UBOOT_SIGN_ENABLE}" = "0" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then
bbwarn "FIT_GENERATE_KEYS is set to 1 eventhough UBOOT_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used."
fi
if [ "${UBOOT_SIGN_ENABLE}" = "1" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then
# Generate keys only if they don't already exist
if [ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key ] || \
[ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt]; then
# make directory if it does not already exist
mkdir -p "${UBOOT_SIGN_KEYDIR}"
echo "Generating RSA private key for signing fitImage"
openssl genrsa ${FIT_KEY_GENRSA_ARGS} -out \
"${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \
"${FIT_SIGN_NUMBITS}"
echo "Generating certificate for signing fitImage"
openssl req ${FIT_KEY_REQ_ARGS} "${FIT_KEY_SIGN_PKCS}" \
-key "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \
-out "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt
fi
fi
}
addtask generate_rsa_keys before do_assemble_fitimage after do_compile
kernel_do_deploy[vardepsexclude] = "DATETIME"
kernel_do_deploy_append() {