commit 062e3d01c039dac541b9fc9eaa1d6c4497435474
author Jens Wiklander <jens.wiklander@linaro.org> Tue Nov 13 09:37:22 2018 +0100
committer Jérôme Forissier <jerome.forissier@linaro.org> Tue Dec 11 13:03:33 2018 +0100
tree f1a85c5f71712eaf4c179e219161390c054e0899
parent ec812024eca23da51990b561b6c9e18c5f8cd071

ta: switch to to mbedtls for bignum

Adds tee_api_arith_mpi.c wrapper providing the TEE Arithmetical API around
the big (mpi) routines from mbedtls.

CFG_TA_MBEDTLS_MPI=y (default y) enables the usage of the bignum routines
in libutee.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

lib/libmbedtls/include/mbedtls_config_uta.h

diff --git a/lib/libmbedtls/include/mbedtls_config_uta.h b/lib/libmbedtls/include/mbedtls_config_uta.h
index 2f5f636..cb41122 100644
--- a/lib/libmbedtls/include/mbedtls_config_uta.h
+++ b/lib/libmbedtls/include/mbedtls_config_uta.h
@@ -3,6 +3,12 @@
 #ifndef __MBEDTLS_CONFIG_UTA_H
 #define __MBEDTLS_CONFIG_UTA_H
 
+/*
+ * When wrapping using TEE_BigInt to represent a mbedtls_mpi we can only
+ * use 32-bit arithmetics.
+ */
+#define MBEDTLS_HAVE_INT32
+
 #define MBEDTLS_CIPHER_MODE_CBC
 #define MBEDTLS_PKCS1_V15
 
@@ -20,6 +26,7 @@
 #define MBEDTLS_NO_PLATFORM_ENTROPY
 
 #define MBEDTLS_BIGNUM_C
+#define MBEDTLS_GENPRIME
 #define MBEDTLS_RSA_C
 #define MBEDTLS_ECDH_C
 #define MBEDTLS_ECDSA_C