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Dynamic selection of ECDSA or RSA

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Add new option rsa+ecdsa for TF_MBEDTLS_KEY_ALG, which selects
rsa or ecdsa depending on the certificate used.

Change-Id: I08d9e99bdbba361ed2ec5624248dc382c750ad47
Signed-off-by: Qixiang Xu <qixiang.xu@arm.com>
This commit is contained in:
Qixiang Xu 2017-08-24 15:26:39 +08:00
parent 9db9c65a11
commit dcbf3932fd
4 changed files with 32 additions and 13 deletions
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11
docs/auth-framework.rst
View file

@ -921,9 +921,12 @@ three functions:
int verify_hash(void *data_ptr, unsigned int data_len,
void *digest_info_ptr, unsigned int digest_info_len);
The key algorithm (rsa, ecdsa) must be specified in the build system using the
``TF_MBEDTLS_KEY_ALG`` variable, so the Makefile can include the corresponding
sources in the build.
The mbedTLS library algorithm support is configured by the
``TF_MBEDTLS_KEY_ALG`` variable which can take in 3 values: `rsa`, `ecdsa` or
`rsa+ecdsa`. This variable allows the Makefile to include the corresponding
sources in the build for the various algorthms. Setting the variable to
`rsa+ecdsa` enables support for both rsa and ecdsa algorithms in the mbedTLS
library.
Note: If code size is a concern, the build option ``MBEDTLS_SHA256_SMALLER`` can
be defined in the platform Makefile. It will make mbed TLS use an implementation
@ -931,7 +934,7 @@ of SHA-256 with smaller memory footprint (~1.5 KB less) but slower (~30%).
--------------
*Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.*
*Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.*
.. _Trusted Board Boot: ./trusted-board-boot.rst
.. _Platform Porting Guide: ./porting-guide.rst

3
drivers/auth/mbedtls/mbedtls_common.c
View file

@ -14,7 +14,8 @@
/*
* mbed TLS heap
*/
#if (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_ECDSA)
#if (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_ECDSA) \
|| (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA_AND_ECDSA)
#define MBEDTLS_HEAP_SIZE (13*1024)
#elif (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA)
#define MBEDTLS_HEAP_SIZE (7*1024)

24
drivers/auth/mbedtls/mbedtls_crypto.mk
View file

@ -41,18 +41,26 @@ MBEDTLS_CRYPTO_SOURCES := drivers/auth/mbedtls/mbedtls_crypto.c \
)
# Key algorithm specific files
MBEDTLS_ECDSA_CRYPTO_SOURCES += $(addprefix ${MBEDTLS_DIR}/library/, \
ecdsa.c \
ecp_curves.c \
ecp.c \
)
MBEDTLS_RSA_CRYPTO_SOURCES += $(addprefix ${MBEDTLS_DIR}/library/, \
rsa.c \
)
ifeq (${TF_MBEDTLS_KEY_ALG},ecdsa)
MBEDTLS_CRYPTO_SOURCES += $(addprefix ${MBEDTLS_DIR}/library/, \
ecdsa.c \
ecp_curves.c \
ecp.c \
)
MBEDTLS_CRYPTO_SOURCES += $(MBEDTLS_ECDSA_CRYPTO_SOURCES)
TF_MBEDTLS_KEY_ALG_ID := TF_MBEDTLS_ECDSA
else ifeq (${TF_MBEDTLS_KEY_ALG},rsa)
MBEDTLS_CRYPTO_SOURCES += $(addprefix ${MBEDTLS_DIR}/library/, \
rsa.c \
)
MBEDTLS_CRYPTO_SOURCES += $(MBEDTLS_RSA_CRYPTO_SOURCES)
TF_MBEDTLS_KEY_ALG_ID := TF_MBEDTLS_RSA
else ifeq (${TF_MBEDTLS_KEY_ALG},rsa+ecdsa)
MBEDTLS_CRYPTO_SOURCES += $(MBEDTLS_ECDSA_CRYPTO_SOURCES)
MBEDTLS_CRYPTO_SOURCES += $(MBEDTLS_RSA_CRYPTO_SOURCES)
TF_MBEDTLS_KEY_ALG_ID := TF_MBEDTLS_RSA_AND_ECDSA
else
$(error "TF_MBEDTLS_KEY_ALG=${TF_MBEDTLS_KEY_ALG} not supported on mbed TLS")
endif

7
include/drivers/auth/mbedtls/mbedtls_config.h
View file

@ -11,6 +11,7 @@
*/
#define TF_MBEDTLS_RSA 1
#define TF_MBEDTLS_ECDSA 2
#define TF_MBEDTLS_RSA_AND_ECDSA 3
/*
* Configuration file to build mbed TLS with the required features for
@ -56,6 +57,12 @@
#elif (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA)
#define MBEDTLS_RSA_C
#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
#elif (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA_AND_ECDSA)
#define MBEDTLS_RSA_C
#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
#define MBEDTLS_ECDSA_C
#define MBEDTLS_ECP_C
#define MBEDTLS_ECP_DP_SECP256R1_ENABLED
#endif
#define MBEDTLS_SHA256_C