crypto: move gf128mul library into lib/crypto

The gf128mul library does not depend on the crypto API at all, so it can
be moved into lib/crypto. This will allow us to use it in other library
code in a subsequent patch without having to depend on CONFIG_CRYPTO.

While at it, change the Kconfig symbol name to align with other crypto
library implementations. However, the source file name is retained, as
it is reflected in the module .ko filename, and changing this might
break things for users.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/arm/crypto/Kconfig

@@ -18,7 +18,7 @@ config CRYPTO_GHASH_ARM_CE
 	depends on KERNEL_MODE_NEON
 	select CRYPTO_HASH
 	select CRYPTO_CRYPTD
-	select CRYPTO_GF128MUL
+	select CRYPTO_LIB_GF128MUL
 	help
 	  GCM GHASH function (NIST SP800-38D)
 

arch/arm64/crypto/Kconfig

@@ -6,8 +6,8 @@ config CRYPTO_GHASH_ARM64_CE
 	tristate "Hash functions: GHASH (ARMv8 Crypto Extensions)"
 	depends on KERNEL_MODE_NEON
 	select CRYPTO_HASH
-	select CRYPTO_GF128MUL
 	select CRYPTO_LIB_AES
+	select CRYPTO_LIB_GF128MUL
 	select CRYPTO_AEAD
 	help
 	  GCM GHASH function (NIST SP800-38D)

crypto/Kconfig

@@ -175,9 +175,6 @@ config CRYPTO_MANAGER_EXTRA_TESTS
 	  This is intended for developer use only, as these tests take much
 	  longer to run than the normal self tests.
 
-config CRYPTO_GF128MUL
-	tristate
-
 config CRYPTO_NULL
 	tristate "Null algorithms"
 	select CRYPTO_NULL2
@@ -714,9 +711,9 @@ config CRYPTO_KEYWRAP
 
 config CRYPTO_LRW
 	tristate "LRW (Liskov Rivest Wagner)"
+	select CRYPTO_LIB_GF128MUL
 	select CRYPTO_SKCIPHER
 	select CRYPTO_MANAGER
-	select CRYPTO_GF128MUL
 	select CRYPTO_ECB
 	help
 	  LRW (Liskov Rivest Wagner) mode
@@ -926,8 +923,8 @@ config CRYPTO_CMAC
 
 config CRYPTO_GHASH
 	tristate "GHASH"
-	select CRYPTO_GF128MUL
 	select CRYPTO_HASH
+	select CRYPTO_LIB_GF128MUL
 	help
 	  GCM GHASH function (NIST SP800-38D)
 
@@ -967,8 +964,8 @@ config CRYPTO_MICHAEL_MIC
 
 config CRYPTO_POLYVAL
 	tristate
-	select CRYPTO_GF128MUL
 	select CRYPTO_HASH
+	select CRYPTO_LIB_GF128MUL
 	help
 	  POLYVAL hash function for HCTR2
 

crypto/Makefile

@@ -85,7 +85,6 @@ obj-$(CONFIG_CRYPTO_WP512) += wp512.o
 CFLAGS_wp512.o := $(call cc-option,-fno-schedule-insns)  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79149
 obj-$(CONFIG_CRYPTO_BLAKE2B) += blake2b_generic.o
 CFLAGS_blake2b_generic.o := -Wframe-larger-than=4096 #  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105930
-obj-$(CONFIG_CRYPTO_GF128MUL) += gf128mul.o
 obj-$(CONFIG_CRYPTO_ECB) += ecb.o
 obj-$(CONFIG_CRYPTO_CBC) += cbc.o
 obj-$(CONFIG_CRYPTO_CFB) += cfb.o

drivers/crypto/chelsio/Kconfig

@@ -3,11 +3,11 @@ config CRYPTO_DEV_CHELSIO
 	tristate "Chelsio Crypto Co-processor Driver"
 	depends on CHELSIO_T4
 	select CRYPTO_LIB_AES
+	select CRYPTO_LIB_GF128MUL
 	select CRYPTO_SHA1
 	select CRYPTO_SHA256
 	select CRYPTO_SHA512
 	select CRYPTO_AUTHENC
-	select CRYPTO_GF128MUL
 	help
 	  The Chelsio Crypto Co-processor driver for T6 adapters.
 

lib/crypto/Kconfig

@@ -11,6 +11,9 @@ config CRYPTO_LIB_AES
 config CRYPTO_LIB_ARC4
 	tristate
 
+config CRYPTO_LIB_GF128MUL
+	tristate
+
 config CRYPTO_ARCH_HAVE_LIB_BLAKE2S
 	bool
 	help

lib/crypto/Makefile

@@ -13,6 +13,8 @@ libaes-y					:= aes.o
 obj-$(CONFIG_CRYPTO_LIB_ARC4)			+= libarc4.o
 libarc4-y					:= arc4.o
 
+obj-$(CONFIG_CRYPTO_LIB_GF128MUL)		+= gf128mul.o
+
 # blake2s is used by the /dev/random driver which is always builtin
 obj-y						+= libblake2s.o
 libblake2s-y					:= blake2s.o