ext: lib: crypto: Extend generic mbedTLS config with HAVE_ASM

Extend generic mbedTLS configuration file with MBEDTLS_HAVE_ASM option,
to allow the use of assembly code. This improves the performances of
asymetric cryptography, however depending on the architecture and the
CPU, this might have an impact on the code size.

Set the default value ot the previous non-configurable value, ie enable
it by default except on ARM.

Signed-off-by: Aurelien Jarno <[email protected]>

Author: aurel32

ext/lib/crypto/mbedtls/Kconfig.tls-generic

@@ -271,6 +271,14 @@ config MBEDTLS_PEM_CERTIFICATE_FORMAT
 	  By default only DER (binary) format of certificates is supported. Enable
 	  this option to enable support for PEM format.
 
+config MBEDTLS_HAVE_ASM
+	bool "Enable use of assembly code"
+	default y if !ARM
+	help
+	  Enable use of assembly code in mbedTLS. This improves the performances
+	  of asymetric cryptography, however this might have an impact on the
+	  code size.
+
 config MBEDTLS_USER_CONFIG_ENABLE
 	bool "Enable user mbedTLS config file"
 	help

ext/lib/crypto/mbedtls/configs/config-tls-generic.h

@@ -22,7 +22,7 @@
 #define MBEDTLS_PLATFORM_PRINTF_ALT
 #define MBEDTLS_PLATFORM_SNPRINTF_ALT
 
-#if !defined(CONFIG_ARM)
+#if defined(CONFIG_MBEDTLS_HAVE_ASM)
 #define MBEDTLS_HAVE_ASM
 #endif