Using HMAC-SHA1 to be the HMAC algorithm of signing hibernate
snapshot image. The digest size of HMAC-SHA1 is 160 bits (20 bytes),
this size will be also applied to the length of HMAC key.
In addition, add HIBERNATE_VERIFICATION kernel config.
Signed-off-by: Lee, Chun-Yi <jlee@xxxxxxxx>
---
include/linux/suspend.h | 5 +++++
kernel/power/Kconfig | 13 +++++++++++++
kernel/power/power.h | 1 +
3 files changed, 19 insertions(+)
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 5efe743..6cd2a48 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -327,6 +327,11 @@ struct platform_hibernation_ops {
};
#ifdef CONFIG_HIBERNATION
+
+/* HMAC Algorithm of Hibernate Signature */
+#define SWSUSP_HMAC "hmac(sha1)"
+#define SWSUSP_DIGEST_SIZE 20
+
/* kernel/power/snapshot.c */
extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
static inline void __init register_nosave_region(unsigned long b, unsigned long e)
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 9e30231..8608b3b 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -66,6 +66,19 @@ config HIBERNATION
For more information take a look at <file:Documentation/power/swsusp.txt>.
+config HIBERNATE_VERIFICATION
+ bool "Hibernate verification"
+ depends on HIBERNATION
+ depends on EFI_STUB
+ depends on X86
+ select CRYPTO_HMAC
+ select CRYPTO_SHA1
+ help
+ This option provides support for generating and verifying the
+ signature of memory snapshot image by HMAC-SHA1. Current mechanism
+ relies on UEFI secure boot environment, EFI stub generates HMAC
+ key for hibernate verification.
+
config ARCH_SAVE_PAGE_KEYS
bool
diff --git a/kernel/power/power.h b/kernel/power/power.h
index caadb56..f65fcf7 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -12,6 +12,7 @@ struct swsusp_info {
unsigned long image_pages;
unsigned long pages;
unsigned long size;
+ u8 signature[SWSUSP_DIGEST_SIZE];
} __aligned(PAGE_SIZE);
#ifdef CONFIG_HIBERNATION
--
1.8.4.5
--
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