[PATCH 2/5] lib: Drop SHA512_ALGO in lieu of SHA512

[Alexandru Gagniuc]

SHA512_ALGO was used as a "either SHA512 or SHA384", although the
implementations of these two algorithms share a majority of code.

>From a Kconfig interface perspective, it makes sense to present two
distinct options. This requires #ifdefing out the SHA512
implementation from sha512.c. The latter doesn't make any sense.

It's reasonable to say in Kconfig that SHA384 depends on SHA512, and
seems to be the more polite way to handle the selection.

Thus, automatically select SHA512 when SHA384 is enabled.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>
---
 arch/arm/mach-socfpga/Kconfig |  2 +-
 lib/Kconfig                   | 12 ++++--------
 lib/Makefile                  |  2 +-
 lib/crypt/Kconfig             |  2 +-
 lib/efi_loader/Kconfig        |  2 +-
 lib/sha512.c                  |  2 --
 6 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index 0c35406232..5d95530292 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -11,7 +11,7 @@ config SOCFPGA_SECURE_VAB_AUTH
 	depends on TARGET_SOCFPGA_AGILEX
 	select FIT_IMAGE_POST_PROCESS
 	select SHA384
-	select SHA512_ALGO
+	select SHA512
 	select SPL_FIT_IMAGE_POST_PROCESS
 	help
 	 All images loaded from FIT will be authenticated by Secure Device
diff --git a/lib/Kconfig b/lib/Kconfig
index c535147aea..48565a4169 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -375,14 +375,9 @@ config SHA256
 	  The SHA256 algorithm produces a 256-bit (32-byte) hash value
 	  (digest).
 
-config SHA512_ALGO
-	bool "Enable SHA512 algorithm"
-	help
-	  This option enables support of internal SHA512 algorithm.
 
 config SHA512
 	bool "Enable SHA512 support"
-	depends on SHA512_ALGO
 	help
 	  This option enables support of hashing using SHA512 algorithm.
 	  The hash is calculated in software.
@@ -391,10 +386,11 @@ config SHA512
 
 config SHA384
 	bool "Enable SHA384 support"
-	depends on SHA512_ALGO
+	select SHA512
 	help
 	  This option enables support of hashing using SHA384 algorithm.
-	  The hash is calculated in software.
+	  The hash is calculated in software. This is also selects SHA512,
+	  because these implementations share the bulk of the code..
 	  The SHA384 algorithm produces a 384-bit (48-byte) hash value
 	  (digest).
 
@@ -409,7 +405,7 @@ if SHA_HW_ACCEL
 
 config SHA512_HW_ACCEL
 	bool "Enable hardware acceleration for SHA512"
-	depends on SHA512_ALGO
+	depends on SHA512
 	help
 	  This option enables hardware acceleration for the SHA384 and SHA512
 	  hashing algorithms. This affects the 'hash' command and also the
diff --git a/lib/Makefile b/lib/Makefile
index 8ba745faa0..6aa48ca3d5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -65,7 +65,7 @@ obj-$(CONFIG_$(SPL_)RSA) += rsa/
 obj-$(CONFIG_HASH) += hash-checksum.o
 obj-$(CONFIG_SHA1) += sha1.o
 obj-$(CONFIG_SHA256) += sha256.o
-obj-$(CONFIG_SHA512_ALGO) += sha512.o
+obj-$(CONFIG_SHA512) += sha512.o
 obj-$(CONFIG_CRYPT_PW) += crypt/
 
 obj-$(CONFIG_$(SPL_)ZLIB) += zlib/
diff --git a/lib/crypt/Kconfig b/lib/crypt/Kconfig
index 5495ae8d4c..6a50029642 100644
--- a/lib/crypt/Kconfig
+++ b/lib/crypt/Kconfig
@@ -20,7 +20,7 @@ config CRYPT_PW_SHA256
 config CRYPT_PW_SHA512
 	bool "Provide sha512crypt"
 	select SHA512
-	select SHA512_ALGO
+	select SHA512
 	help
 	  Enables support for the sha512crypt password-hashing algorithm.
 	  The prefix is "$6$".
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index dacc3b5881..08463251cd 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -323,7 +323,7 @@ config EFI_TCG2_PROTOCOL
 	depends on TPM_V2
 	select SHA1
 	select SHA256
-	select SHA512_ALGO
+	select SHA512
 	select SHA384
 	select SHA512
 	select HASH
diff --git a/lib/sha512.c b/lib/sha512.c
index 35f31e3dc5..a421f249ba 100644
--- a/lib/sha512.c
+++ b/lib/sha512.c
@@ -320,7 +320,6 @@ void sha384_csum_wd(const unsigned char *input, unsigned int ilen,
 
 #endif
 
-#if defined(CONFIG_SHA512)
 void sha512_starts(sha512_context * ctx)
 {
 	ctx->state[0] = SHA512_H0;
@@ -381,4 +380,3 @@ void sha512_csum_wd(const unsigned char *input, unsigned int ilen,
 
 	sha512_finish(&ctx, output);
 }
-#endif
-- 
2.31.1