Smaller implementation for SHA256 and SHA512 helps to reduce the
ROM footprint though it has a certain impact on performance.
As a trade-off, enable it as a default config when MbedTLS is
enabled can reduce the target size significantly with acceptable
performace loss.
Signed-off-by: Raymond Mao <raymond....@linaro.org>
---
Changes in v6
- Initial patch
Changes in v7
- Fixed the config dependencies.
lib/mbedtls/Kconfig | 24 ++++++++++++++++++++++++
lib/mbedtls/mbedtls_def_config.h | 6 ++++++
2 files changed, 30 insertions(+)
diff --git a/lib/mbedtls/Kconfig b/lib/mbedtls/Kconfig
index 12f8c965f5a..7ee1139568b 100644
--- a/lib/mbedtls/Kconfig
+++ b/lib/mbedtls/Kconfig
@@ -155,6 +155,18 @@ config SHA256_MBEDTLS
This option enables support of hashing using SHA256 algorithm
with MbedTLS crypto library.
+if SHA256_MBEDTLS
+
+config SHA256_SMALLER
+ bool "Enable SHA256 smaller implementation with MbedTLS crypto library"
+ depends on SHA256_MBEDTLS
+ default y if SHA256_MBEDTLS
+ help
+ This option enables support of hashing using SHA256 algorithm
+ smaller implementation with MbedTLS crypto library.
+
+endif
+
config SHA512_MBEDTLS
bool "Enable SHA512 support with MbedTLS crypto library"
depends on MBEDTLS_LIB_CRYPTO && SHA512
@@ -163,6 +175,18 @@ config SHA512_MBEDTLS
This option enables support of hashing using SHA512 algorithm
with MbedTLS crypto library.
+if SHA512_MBEDTLS
+
+config SHA512_SMALLER
+ bool "Enable SHA512 smaller implementation with MbedTLS crypto library"
+ depends on SHA512_MBEDTLS
+ default y if SHA512_MBEDTLS
+ help
+ This option enables support of hashing using SHA512 algorithm
+ smaller implementation with MbedTLS crypto library.
+
+endif
+
config SHA384_MBEDTLS
bool "Enable SHA384 support with MbedTLS crypto library"
depends on MBEDTLS_LIB_CRYPTO && SHA384
diff --git a/lib/mbedtls/mbedtls_def_config.h b/lib/mbedtls/mbedtls_def_config.h
index be619f5b838..47918e3f4a6 100644
--- a/lib/mbedtls/mbedtls_def_config.h
+++ b/lib/mbedtls/mbedtls_def_config.h
@@ -26,6 +26,9 @@
#if CONFIG_IS_ENABLED(SHA256)
#define MBEDTLS_MD_C
#define MBEDTLS_SHA256_C
+#if CONFIG_IS_ENABLED(SHA256_SMALLER)
+#define MBEDTLS_SHA256_SMALLER
+#endif
#endif
#if CONFIG_IS_ENABLED(SHA384)
@@ -36,6 +39,9 @@
#if CONFIG_IS_ENABLED(SHA512)
#define MBEDTLS_MD_C
#define MBEDTLS_SHA512_C
+#if CONFIG_IS_ENABLED(SHA512_SMALLER)
+#define MBEDTLS_SHA512_SMALLER
+#endif
#endif
#endif /* #if defined CONFIG_MBEDTLS_LIB_CRYPTO */
--
2.25.1
