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Reduce the default MBEDTLS_ECP_WINDOW_SIZE value to 2

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As tested in https://github.com/Mbed-TLS/mbedtls/issues/6790,
after introducing side-channel counter-measures to bignum,
the performance of RSA decryption in correlation to the
MBEDTLS_ECP_WINDOW_SIZE has changed.
The default value of 2 has been chosen as it provides best
or close-to-best results for tests on Cortex-M4 and Intel i7.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2023-02-24 07:44:57 -05:00
parent a3b625b0a1
commit 86f30ff626
3 changed files with 10 additions and 3 deletions
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4
include/mbedtls/bignum.h
View file

@ -63,7 +63,7 @@
#if !defined(MBEDTLS_MPI_WINDOW_SIZE)
/*
* Maximum window size used for modular exponentiation. Default: 6
* Maximum window size used for modular exponentiation. Default: 2
* Minimum value: 1. Maximum value: 6.
*
* Result is an array of ( 2 ** MBEDTLS_MPI_WINDOW_SIZE ) MPIs used
@ -71,7 +71,7 @@
*
* Reduction in size, reduces speed.
*/
#define MBEDTLS_MPI_WINDOW_SIZE 6 /**< Maximum window size used. */
#define MBEDTLS_MPI_WINDOW_SIZE 2 /**< Maximum window size used. */
#endif /* !MBEDTLS_MPI_WINDOW_SIZE */
#if !defined(MBEDTLS_MPI_MAX_SIZE)

2
include/mbedtls/mbedtls_config.h
View file

@ -3559,7 +3559,7 @@
* comment in the specific module. */
/* MPI / BIGNUM options */
//#define MBEDTLS_MPI_WINDOW_SIZE 6 /**< Maximum window size used. */
//#define MBEDTLS_MPI_WINDOW_SIZE 2 /**< Maximum window size used. */
//#define MBEDTLS_MPI_MAX_SIZE 1024 /**< Maximum number of bytes for usable MPIs. */
/* CTR_DRBG options */