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ECP: Add module and function level replacement options.

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This commit is contained in:
Janos Follath 2016-08-18 12:38:46 +01:00 • committed by Simon Butcher
parent 5c79d25d94
commit b069753313
6 changed files with 307 additions and 10 deletions
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68
include/mbedtls/config.h
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@ -218,9 +218,9 @@
* \def MBEDTLS_AES_ALT
*
* MBEDTLS__MODULE_NAME__ALT: Uncomment a macro to let mbed TLS use your
* alternate core implementation of a symmetric crypto or hash module (e.g.
* platform specific assembly optimized implementations). Keep in mind that
* the function prototypes should remain the same.
* alternate core implementation of a symmetric crypto, an arithmetic or hash
* module (e.g. platform specific assembly optimized implementations). Keep
* in mind that the function prototypes should remain the same.
*
* This replaces the whole module. If you only want to replace one of the
* functions, use one of the MBEDTLS__FUNCTION_NAME__ALT flags.
@ -246,6 +246,14 @@
//#define MBEDTLS_SHA1_ALT
//#define MBEDTLS_SHA256_ALT
//#define MBEDTLS_SHA512_ALT
/*
* When replacing the elliptic curve module, pleace consider, that it is
* implemented with two .c files:
* - ecp.c
* - ecp_curves.c
* Please make sure that you provide functionality for both of them.
*/
//#define MBEDTLS_ECP_ALT
/**
* \def MBEDTLS_MD2_PROCESS_ALT
@ -285,6 +293,60 @@
//#define MBEDTLS_AES_ENCRYPT_ALT
//#define MBEDTLS_AES_DECRYPT_ALT
/**
* \def MBEDTLS_ECP_FUNCTION_ALT
*
* MBEDTLS_ECP__FUNCTION_NAME__ALT: Uncomment a macro to let mbed TLS use your
* alternate core implementation of elliptic curve arithmetic. Keep in mind that
* function prototypes should remain the same.
*
* This partially replaces one function. The header file from mbed TLS is still
* used, in contrast to the MBEDTLS_ECP_ALT flag. The original implementation
* is still present and it is used for group structures not supported by the
* alternative.
*
* Any of these options become available by turning MBEDTLS_ECP_FUNCTION_ALT and
* implementing the following function:
* unsigned char ecp_alt_grp_capable( const mbedtls_ecp_group *grp )
* This should return 1 if the replacement functions implement arithmetic for
* the given group and 0 otherwise.
*
* The functions
* int ecp_alt_init( const mbedtls_ecp_group *grp )
* void ecp_alt_deinit( const mbedtls_ecp_group *grp )
* can be turned on by MBEDTLS_ECP_ALT_INIT and MBEDTLS_ECP_ALT_DEINIT.
* They are called before and after each point operation and provide an
* opportunity to implement optimized set up and tear down instructions.
*
* Example: In case you uncomment MBEDTLS_ECP_FUNCTION_ALT and
* MBEDTLS_ECP_DOUBLE_JAC, mbed TLS will still provide the ecp_double_jac
* function, but will use your ecp_double_jac_alt if the group is supported
* (your ecp_alt_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
* ecp_double_jac_alt and ecp_alt_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_FUNCTION_ALT
/* Utility functions for setup and cleanup */
//#define MBEDTLS_ECP_ALT_INIT
//#define MBEDTLS_ECP_ALT_DEINIT
/* Support for Weierstrass curves with Jacobi representation */
//#define MBEDTLS_ECP_RANDOMIZE_JAC_ALT
//#define MBEDTLS_ECP_ADD_MIXED_ALT
//#define MBEDTLS_ECP_DOUBLE_JAC_ALT
//#define MBEDTLS_ECP_NORMALIZE_JAC_MANY_ALT
//#define MBEDTLS_ECP_NORMALIZE_JAC_ALT
/* Support for curves with Montgomery arithmetic */
//#define MBEDTLS_ECP_DOUBLE_ADD_MXZ_ALT
//#define MBEDTLS_ECP_RANDOMIZE_MXZ_ALT
//#define MBEDTLS_ECP_NORMALIZE_MXZ_ALT
/**
* \def MBEDTLS_TEST_NULL_ENTROPY
*