[PATCH v4 01/14] mbedtls: enable support of ecc
Raymond Mao
raymondmaoca at gmail.com
Mon Apr 20 18:17:06 CEST 2026
Hi Philippe,
On Fri, Apr 17, 2026 at 9:02 AM Philippe Reynes
<philippe.reynes at softathome.com> wrote:
>
> Enables the support of ecc in mbedtls.
>
> Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
> ---
> v2:
> - move ecdsa to MBEDTLS_LIB_X509
> - enhance depencendies
> v3:
> - do not use _MBEDTLS in mbedtls_def_config.h
>
> v4:
> - do not select ECDSA on some configs
> - remove duplicated MBEDTLS_ECP_DP_SECP256K1_ENABLED
> - change dependencies for ECDSA configs
>
> configs/sandbox_defconfig | 1 +
> lib/ecdsa/Kconfig | 1 +
> lib/mbedtls/Kconfig | 14 ++++++++++++++
> lib/mbedtls/Makefile | 17 +++++++++--------
> lib/mbedtls/mbedtls_def_config.h | 17 +++++++++++++++++
> 5 files changed, 42 insertions(+), 8 deletions(-)
>
> diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
> index f26295103f1..15831dd7e04 100644
> --- a/configs/sandbox_defconfig
> +++ b/configs/sandbox_defconfig
> @@ -391,6 +391,7 @@ CONFIG_PANIC_HANG=y
> CONFIG_CMD_DHRYSTONE=y
> CONFIG_MBEDTLS_LIB=y
> CONFIG_HKDF_MBEDTLS=y
> +CONFIG_ECDSA_MBEDTLS=y
> CONFIG_ECDSA=y
> CONFIG_ECDSA_VERIFY=y
> CONFIG_RSASSA_PSS=y
> diff --git a/lib/ecdsa/Kconfig b/lib/ecdsa/Kconfig
> index ca13b6bfa1f..dac8bcf23dd 100644
> --- a/lib/ecdsa/Kconfig
> +++ b/lib/ecdsa/Kconfig
> @@ -1,6 +1,7 @@
> config ECDSA
> bool "Enable ECDSA support"
> depends on DM
> + select ASN1_DECODER
> help
> This enables the ECDSA (elliptic curve signature) algorithm for FIT
> image verification in U-Boot. The ECDSA algorithm is implemented
> diff --git a/lib/mbedtls/Kconfig b/lib/mbedtls/Kconfig
> index 789721ee6cd..cfc47152fc5 100644
> --- a/lib/mbedtls/Kconfig
> +++ b/lib/mbedtls/Kconfig
> @@ -247,6 +247,10 @@ config MBEDTLS_LIB_X509
>
> if MBEDTLS_LIB_X509
>
> +config BIGNUM_MBEDTLS
> + bool
> + default n
> +
> config ASN1_DECODER_MBEDTLS
> bool "ASN1 decoder with MbedTLS certificate library"
> depends on MBEDTLS_LIB_X509 && ASN1_DECODER
> @@ -264,6 +268,7 @@ config RSA_PUBLIC_KEY_PARSER_MBEDTLS
> bool "RSA public key parser with MbedTLS certificate library"
> depends on ASYMMETRIC_PUBLIC_KEY_MBEDTLS
> select ASN1_DECODER_MBEDTLS
> + select BIGNUM_MBEDTLS
> help
> This option chooses MbedTLS certificate library for RSA public key
> parser.
> @@ -292,6 +297,15 @@ config MSCODE_PARSER_MBEDTLS
> This option chooses MbedTLS certificate library for MS authenticode
> parser.
>
> +config ECDSA_MBEDTLS
> + bool "Enable ECDSA support with MbedTLS certificate library"
> + depends on MBEDTLS_LIB_X509 && ECDSA_VERIFY
> + select ASN1_DECODER_MBEDTLS
select ASN1_DECODER_MBEDTLS if ASN1_DECODER
All _MBEDTLS switches should be under control of the main switches.
> + select BIGNUM_MBEDTLS
> + help
> + This option enables support of ECDSA with the MbedTLS certificate
> + library.
> +
> endif # MBEDTLS_LIB_X509
>
> config MBEDTLS_LIB_TLS
> diff --git a/lib/mbedtls/Makefile b/lib/mbedtls/Makefile
> index c5b445bd85c..aa1ca6d196b 100644
> --- a/lib/mbedtls/Makefile
> +++ b/lib/mbedtls/Makefile
> @@ -38,14 +38,20 @@ mbedtls_lib_crypto-$(CONFIG_$(PHASE_)HKDF_MBEDTLS) += \
>
> # MbedTLS X509 library
> obj-$(CONFIG_$(XPL_)MBEDTLS_LIB_X509) += mbedtls_lib_x509.o
> -mbedtls_lib_x509-y := $(MBEDTLS_LIB_DIR)/x509.o
> +mbedtls_lib_x509-y := $(MBEDTLS_LIB_DIR)/x509.o \
> + $(MBEDTLS_LIB_DIR)/ecdsa.o \
> + $(MBEDTLS_LIB_DIR)/ecp.o \
> + $(MBEDTLS_LIB_DIR)/ecp_curves.o \
> + $(MBEDTLS_LIB_DIR)/ecp_curves_new.o \
> + $(MBEDTLS_LIB_DIR)/pk_ecc.o
To avoid increasing binary size and making the build dependency
broader than the feature being enabled, please use
'mbedtls_lib_x509-$(CONFIG_$(PHASE_)ECDSA_MBEDTLS)' instead of
'mbedtls_lib_x509-y' when introducing the ecdsa/ecp/ecc objects.
Regards,
Raymond
> +mbedtls_lib_x509-$(CONFIG_$(PHASE_)BIGNUM_MBEDTLS) += \
> + $(MBEDTLS_LIB_DIR)/bignum.o \
> + $(MBEDTLS_LIB_DIR)/bignum_core.o
> mbedtls_lib_x509-$(CONFIG_$(PHASE_)ASN1_DECODER_MBEDTLS) += \
> $(MBEDTLS_LIB_DIR)/asn1parse.o \
> $(MBEDTLS_LIB_DIR)/asn1write.o \
> $(MBEDTLS_LIB_DIR)/oid.o
> mbedtls_lib_x509-$(CONFIG_$(PHASE_)RSA_PUBLIC_KEY_PARSER_MBEDTLS) += \
> - $(MBEDTLS_LIB_DIR)/bignum.o \
> - $(MBEDTLS_LIB_DIR)/bignum_core.o \
> $(MBEDTLS_LIB_DIR)/rsa.o \
> $(MBEDTLS_LIB_DIR)/rsa_alt_helpers.o
> mbedtls_lib_x509-$(CONFIG_$(PHASE_)ASYMMETRIC_PUBLIC_KEY_MBEDTLS) += \
> @@ -64,7 +70,6 @@ mbedtls_lib_tls-y := \
> $(MBEDTLS_LIB_DIR)/mps_reader.o \
> $(MBEDTLS_LIB_DIR)/mps_trace.o \
> $(MBEDTLS_LIB_DIR)/net_sockets.o \
> - $(MBEDTLS_LIB_DIR)/pk_ecc.o \
> $(MBEDTLS_LIB_DIR)/ssl_cache.o \
> $(MBEDTLS_LIB_DIR)/ssl_ciphersuites.o \
> $(MBEDTLS_LIB_DIR)/ssl_client.o \
> @@ -82,8 +87,4 @@ mbedtls_lib_tls-y := \
> $(MBEDTLS_LIB_DIR)/cipher.o \
> $(MBEDTLS_LIB_DIR)/cipher_wrap.o \
> $(MBEDTLS_LIB_DIR)/ecdh.o \
> - $(MBEDTLS_LIB_DIR)/ecdsa.o \
> - $(MBEDTLS_LIB_DIR)/ecp.o \
> - $(MBEDTLS_LIB_DIR)/ecp_curves.o \
> - $(MBEDTLS_LIB_DIR)/ecp_curves_new.o \
> $(MBEDTLS_LIB_DIR)/gcm.o \
> diff --git a/lib/mbedtls/mbedtls_def_config.h b/lib/mbedtls/mbedtls_def_config.h
> index dda3f4dd6e4..239215ecf85 100644
> --- a/lib/mbedtls/mbedtls_def_config.h
> +++ b/lib/mbedtls/mbedtls_def_config.h
> @@ -89,6 +89,23 @@
> #define MBEDTLS_ASN1_WRITE_C
> #endif
>
> +#if CONFIG_IS_ENABLED(ECDSA)
> +#define MBEDTLS_ECDSA_C
> +#define MBEDTLS_ECP_C
> +#define MBEDTLS_BIGNUM_C
> +#define MBEDTLS_ECP_DP_SECP192R1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP224R1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP256R1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP384R1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP521R1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP192K1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP224K1_ENABLED
> +#define MBEDTLS_ECP_DP_SECP256K1_ENABLED
> +#define MBEDTLS_ECP_DP_BP256R1_ENABLED
> +#define MBEDTLS_ECP_DP_BP384R1_ENABLED
> +#define MBEDTLS_ECP_DP_BP512R1_ENABLED
> +#endif
> +
> #endif /* #if CONFIG_IS_ENABLED(MBEDTLS_LIB_X509) */
>
> #if CONFIG_IS_ENABLED(MBEDTLS_LIB_TLS)
> --
> 2.43.0
>
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