MODSIGN: Simplify Makefile with a Kconfig helper

Signed-off-by: Michal Marek <mmarek@suse.cz>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 12 insertions, 19 deletions

diff --git a/init/Kconfig b/init/Kconfig
index be8b7f55312d..fff4cb1321c5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1697,6 +1697,15 @@ config MODULE_SIG_SHA512
 
 endchoice
 
+config MODULE_SIG_HASH
+        string
+        depends on MODULE_SIG
+        default "sha1" if MODULE_SIG_SHA1
+        default "sha224" if MODULE_SIG_SHA224
+        default "sha256" if MODULE_SIG_SHA256
+        default "sha384" if MODULE_SIG_SHA384
+        default "sha512" if MODULE_SIG_SHA512
+
 endif # MODULES
 
 config INIT_ALL_POSSIBLE
diff --git a/kernel/Makefile b/kernel/Makefile
index 6c072b6da239..eceac38f3c65 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -153,23 +153,7 @@ kernel/modsign_certificate.o: signing_key.x509 extra_certificates
 # fail and that the kernel may be used afterwards.
 #
 ###############################################################################
-sign_key_with_hash :=
-ifeq ($(CONFIG_MODULE_SIG_SHA1),y)
-sign_key_with_hash := -sha1
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA224),y)
-sign_key_with_hash := -sha224
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA256),y)
-sign_key_with_hash := -sha256
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA384),y)
-sign_key_with_hash := -sha384
-endif
-ifeq ($(CONFIG_MODULE_SIG_SHA512),y)
-sign_key_with_hash := -sha512
-endif
-ifeq ($(sign_key_with_hash),)
+ifndef CONFIG_MODULE_SIG_HASH
 $(error Could not determine digest type to use from kernel config)
 endif
 
@@ -182,8 +166,8 @@ signing_key.priv signing_key.x509: x509.genkey
         @echo "### needs to be run as root, and uses a hardware random"
         @echo "### number generator if one is available."
         @echo "###"
-        openssl req -new -nodes -utf8 $(sign_key_with_hash) -days 36500 -batch \
-                -x509 -config x509.genkey \
+        openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
+                -batch -x509 -config x509.genkey \
                 -outform DER -out signing_key.x509 \
                 -keyout signing_key.priv
         @echo "###"