wolfssl: enable CPU crypto instructions

This enables AES & SHA CPU instructions for compatible armv8, and x86_64
architectures.  Add this to the hardware acceleration choice, since they
can't be enabled at the same time.

The package was marked non-shared, since the arm CPUs may or may not
have crypto extensions enabled based on licensing; bcm27xx does not
enable them.  There is no run-time detection of this for arm.

NOTE:
Should this be backported to a release branch, it must be done shortly
before a new minor release, because the change to nonshared will remove
libwolfssl from the shared packages, but the nonshared are only built in
a subsequent release!

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

package/libs/wolfssl/Config.in

@@ -62,13 +62,25 @@ config WOLFSSL_ALT_NAMES
 config WOLFSSL_HAS_DEVCRYPTO
 	bool
 
+config WOLFSSL_ASM_CAPABLE
+	bool
+	default x86_64 || (aarch64 && !TARGET_bcm27xx)
+
 choice
 	prompt "Hardware Acceleration"
+	default WOLFSSL_HAS_CPU_CRYPTO if WOLFSSL_ASM_CAPABLE
 	default WOLFSSL_HAS_NO_HW
 
 	config WOLFSSL_HAS_NO_HW
 		bool "None"
 
+	config WOLFSSL_HAS_CPU_CRYPTO
+		bool "Use CPU crypto instructions"
+		depends on WOLFSSL_ASM_CAPABLE
+		help
+		This will use Intel AESNI insturctions or armv8 Crypto Extensions.
+		Either of them should easily outperform hardware crypto in WolfSSL.
+
 	config WOLFSSL_HAS_AFALG
 		bool "AF_ALG"
 

package/libs/wolfssl/Makefile

@@ -43,6 +43,7 @@ PKG_ABI_VERSION:=$(patsubst %-stable,%,$(PKG_VERSION)).$(call version_abbrev,$(c
 
 PKG_CONFIG_DEPENDS+=\
 	CONFIG_WOLFSSL_HAS_AFALG \
+	CONFIG_WOLFSSL_HAS_CPU_CRYPTO \
 	CONFIG_WOLFSSL_HAS_DEVCRYPTO_AES \
 	CONFIG_WOLFSSL_HAS_DEVCRYPTO_CBC \
 	CONFIG_WOLFSSL_HAS_DEVCRYPTO_FULL
@@ -59,6 +60,7 @@ endef
 define Package/libwolfssl
 $(call Package/libwolfssl/Default)
   TITLE:=wolfSSL library
+  PKGFLAGS:=nonshared
   MENU:=1
   PROVIDES:=libcyassl
   DEPENDS:=+WOLFSSL_HAS_DEVCRYPTO:kmod-cryptodev +WOLFSSL_HAS_AFALG:kmod-crypto-user
@@ -133,6 +135,15 @@ CONFIGURE_ARGS += \
 	--enable-wpas --enable-fortress --enable-fastmath
 endif
 
+ifdef CONFIG_WOLFSSL_HAS_CPU_CRYPTO
+    ifdef CONFIG_aarch64
+	CONFIGURE_ARGS += --enable-armasm
+	TARGET_CFLAGS:=$(TARGET_CFLAGS:-mcpu%=-mcpu%+crypto)
+    else ifdef CONFIG_TARGET_x86_64
+	CONFIGURE_ARGS += --enable-intelasm
+    endif
+endif
+
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include $(1)/usr/lib/pkgconfig
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/* $(1)/usr/include/