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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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82
include/mbedtls/alt_internal/ecp_function_alt.h Normal file
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@ -0,0 +1,82 @@
/**
* \file alt_func_internal.h
*
* \brief Function declarations for alternate implementation.
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_ECP_FUNCTION_ALT_H
#define MBEDTLS_ECP_FUNCTION_ALT_H
#if defined(MBEDTLS_ECP_FUNCTION_ALT)
unsigned char ecp_alt_grp_capable( const mbedtls_ecp_group *grp );
#if defined(MBEDTLS_ECP_ALT_INIT)
int ecp_alt_init( const mbedtls_ecp_group *grp );
#endif
#if defined(MBEDTLS_ECP_ALT_DEINIT)
void ecp_alt_deinit( const mbedtls_ecp_group *grp );
#endif
#if defined(MBEDTLS_ECP_RANDOMIZE_JAC_ALT)
int ecp_randomize_jac_alt( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
#endif
#if defined(MBEDTLS_ECP_ADD_MIXED_ALT)
int ecp_add_mixed_alt( const mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_ecp_point *P, const mbedtls_ecp_point *Q );
#endif
#if defined(MBEDTLS_ECP_DOUBLE_JAC_ALT)
int ecp_double_jac_alt( const mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_ecp_point *P );
#endif
#if defined(MBEDTLS_ECP_NORMALIZE_JAC_MANY_ALT)
int ecp_normalize_jac_many_alt( const mbedtls_ecp_group *grp,
mbedtls_ecp_point *T[], size_t t_len );
#endif
#if defined(MBEDTLS_ECP_NORMALIZE_JAC_ALT)
int ecp_normalize_jac_alt( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt );
#endif
#if defined(MBEDTLS_ECP_DOUBLE_ADD_MXZ_ALT)
int ecp_double_add_mxz_alt( const mbedtls_ecp_group *grp,
mbedtls_ecp_point *R, mbedtls_ecp_point *S,
const mbedtls_ecp_point *P, const mbedtls_ecp_point *Q,
const mbedtls_mpi *d );
#endif
#if defined(MBEDTLS_ECP_RANDOMIZE_MXZ_ALT)
int ecp_randomize_mxz_alt( const mbedtls_ecp_group *grp, mbedtls_ecp_point *P,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
#endif
#if defined(MBEDTLS_ECP_NORMALIZE_MXZ_ALT)
int ecp_normalize_mxz_alt( const mbedtls_ecp_group *grp, mbedtls_ecp_point *P );
#endif
#endif // MBEDTLS_ECP_FUNCTION_ALT
#endif /* ecp_function_alt.h */

40
include/mbedtls/check_config.h
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@ -150,6 +150,46 @@
#error "MBEDTLS_GCM_C defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_ALT_INIT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_ALT_INIT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_ALT_DEINIT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_ALT_DEINIT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_RANDOMIZE_JAC_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_RANDOMIZE_JAC_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_ADD_MIXED_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_ADD_MIXED_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_DOUBLE_JAC_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_DOUBLE_JAC_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_NORMALIZE_JAC_MANY_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_NORMALIZE_JAC_MANY_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_NORMALIZE_JAC_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_NORMALIZE_JAC_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_DOUBLE_ADD_MXZ_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_DOUBLE_ADD_MXZ_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_RANDOMIZE_MXZ_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_RANDOMIZE_MXZ_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_NORMALIZE_MXZ_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
#error "MBEDTLS_ECP_NORMALIZE_MXZ_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_HAVEGE_C) && !defined(MBEDTLS_TIMING_C)
#error "MBEDTLS_HAVEGE_C defined, but not all prerequisites"
#endif

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
*

12
include/mbedtls/ecp.h
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@ -37,6 +37,10 @@
#define MBEDTLS_ERR_ECP_INVALID_KEY -0x4C80 /**< Invalid private or public key. */
#define MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH -0x4C00 /**< Signature is valid but shorter than the user-supplied length. */
#if !defined(MBEDTLS_ECP_ALT)
// Regular implementation
//
#ifdef __cplusplus
extern "C" {
#endif
@ -654,16 +658,22 @@ int mbedtls_ecp_gen_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
int mbedtls_ecp_check_pub_priv( const mbedtls_ecp_keypair *pub, const mbedtls_ecp_keypair *prv );
#if defined(MBEDTLS_SELF_TEST)
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if a test failed
*/
int mbedtls_ecp_self_test( int verbose );
#endif
#endif // MBEDTLS_SELF_TEST
#ifdef __cplusplus
}
#endif
#else /* MBEDTLS_ECP_ALT */
#include "ecp_alt.h"
#endif /* MBEDTLS_ECP_ALT */
#endif /* ecp.h */