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Add a flag for disabling fallback in ecp.c

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Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-01-08 16:32:20 +01:00
parent a51e1dbe76
commit 97b4984657
5 changed files with 75 additions and 5 deletions
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16
include/mbedtls/config.h
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@ -484,6 +484,11 @@
* is still present and it is used for group structures not supported by the
* alternative.
*
* The original implementation can in addition be removed by setting the
* MBEDTLS_ECP_NO_FALLBACK, in which case any function for which the
* corresponding MBEDTLS_ECP__FUNCTION_NAME__ALT macro is defined will not be
* able to fallback to curves not supported by the alternative implementation.
*
* Any of these options become available by defining MBEDTLS_ECP_INTERNAL_ALT
* and implementing the following functions:
* unsigned char mbedtls_internal_ecp_grp_capable(
@ -502,16 +507,19 @@
* function, but will use your mbedtls_internal_ecp_double_jac if the group is
* supported (your mbedtls_internal_ecp_grp_capable function returns 1 when
* receives it as an argument). If the group is not supported then the original
* implementation is used. The other functions and the definition of
* mbedtls_ecp_group and mbedtls_ecp_point will not change, so your
* implementation of mbedtls_internal_ecp_double_jac and
* mbedtls_internal_ecp_grp_capable must be compatible with this definition.
* implementation is used, unless disabled by MBEDTLS_ECP_NO_FALLBACK. The
* other functions and the definition of mbedtls_ecp_group and
* mbedtls_ecp_point will not change, so your implementation of
* mbedtls_internal_ecp_double_jac and mbedtls_internal_ecp_grp_capable must be
* compatible with this definition.
*
* Uncomment a macro to enable alternate implementation of the corresponding
* function.
*/
/* Required for all the functions in this section */
//#define MBEDTLS_ECP_INTERNAL_ALT
/* Turn off software fallback for curves not supported in hardware */
//#define MBEDTLS_ECP_NO_FALLBACK
/* Support for Weierstrass curves with Jacobi representation */
//#define MBEDTLS_ECP_RANDOMIZE_JAC_ALT
//#define MBEDTLS_ECP_ADD_MIXED_ALT