platform_util.h

/**
 * \file platform_util.h
 *
 * \brief Common and shared functions used by multiple modules in the Mbed TLS
 *        library.
 */
/*
 *  Copyright (C) 2018, 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_PLATFORM_UTIL_H
#define MBEDTLS_PLATFORM_UTIL_H

#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#if defined(MBEDTLS_CHECK_PARAMS)

#if defined(MBEDTLS_CHECK_PARAMS_ASSERT)
/* Allow the user to define MBEDTLS_PARAM_FAILED to something like assert
 * (which is what our config.h suggests). */
#include <assert.h>
#endif /* MBEDTLS_CHECK_PARAMS_ASSERT */

#if defined(MBEDTLS_PARAM_FAILED)
/** An alternative definition of MBEDTLS_PARAM_FAILED has been set in config.h.
 *
 * This flag can be used to check whether it is safe to assume that
 * MBEDTLS_PARAM_FAILED() will expand to a call to mbedtls_param_failed().
 */
#define MBEDTLS_PARAM_FAILED_ALT

#elif defined(MBEDTLS_CHECK_PARAMS_ASSERT)
#define MBEDTLS_PARAM_FAILED( cond ) assert( cond )
#define MBEDTLS_PARAM_FAILED_ALT

#else /* MBEDTLS_PARAM_FAILED */
#define MBEDTLS_PARAM_FAILED( cond ) \
    mbedtls_param_failed( #cond, __FILE__, __LINE__ )

/**
 * \brief       User supplied callback function for parameter validation failure.
 *              See #MBEDTLS_CHECK_PARAMS for context.
 *
 *              This function will be called unless an alternative treatement
 *              is defined through the #MBEDTLS_PARAM_FAILED macro.
 *
 *              This function can return, and the operation will be aborted, or
 *              alternatively, through use of setjmp()/longjmp() can resume
 *              execution in the application code.
 *
 * \param failure_condition The assertion that didn't hold.
 * \param file  The file where the assertion failed.
 * \param line  The line in the file where the assertion failed.
 */
void mbedtls_param_failed( const char *failure_condition,
                           const char *file,
                           int line );
#endif /* MBEDTLS_PARAM_FAILED */

/* Internal macro meant to be called only from within the library. */
#define MBEDTLS_INTERNAL_VALIDATE_RET( cond, ret )  \
    do {                                            \
        if( !(cond) )                               \
        {                                           \
            MBEDTLS_PARAM_FAILED( cond );           \
            return( ret );                          \
        }                                           \
    } while( 0 )

/* Internal macro meant to be called only from within the library. */
#define MBEDTLS_INTERNAL_VALIDATE( cond )           \
    do {                                            \
        if( !(cond) )                               \
        {                                           \
            MBEDTLS_PARAM_FAILED( cond );           \
            return;                                 \
        }                                           \
    } while( 0 )

#else /* MBEDTLS_CHECK_PARAMS */

/* Internal macros meant to be called only from within the library. */
#define MBEDTLS_INTERNAL_VALIDATE_RET( cond, ret )  do { } while( 0 )
#define MBEDTLS_INTERNAL_VALIDATE( cond )           do { } while( 0 )

#endif /* MBEDTLS_CHECK_PARAMS */

/* Internal helper macros for deprecating API constants. */
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#if defined(MBEDTLS_DEPRECATED_WARNING)
/* Deliberately don't (yet) export MBEDTLS_DEPRECATED here
 * to avoid conflict with other headers which define and use
 * it, too. We might want to move all these definitions here at
 * some point for uniformity. */
#define MBEDTLS_DEPRECATED __attribute__((deprecated))
MBEDTLS_DEPRECATED typedef char const * mbedtls_deprecated_string_constant_t;
#define MBEDTLS_DEPRECATED_STRING_CONSTANT( VAL )       \
    ( (mbedtls_deprecated_string_constant_t) ( VAL ) )
MBEDTLS_DEPRECATED typedef int mbedtls_deprecated_numeric_constant_t;
#define MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( VAL )       \
    ( (mbedtls_deprecated_numeric_constant_t) ( VAL ) )
#undef MBEDTLS_DEPRECATED
#else /* MBEDTLS_DEPRECATED_WARNING */
#define MBEDTLS_DEPRECATED_STRING_CONSTANT( VAL ) VAL
#define MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( VAL ) VAL
#endif /* MBEDTLS_DEPRECATED_WARNING */
#endif /* MBEDTLS_DEPRECATED_REMOVED */

/**
 * \brief       Securely zeroize a buffer
 *
 *              The function is meant to wipe the data contained in a buffer so
 *              that it can no longer be recovered even if the program memory
 *              is later compromised. Call this function on sensitive data
 *              stored on the stack before returning from a function, and on
 *              sensitive data stored on the heap before freeing the heap
 *              object.
 *
 *              It is extremely difficult to guarantee that calls to
 *              mbedtls_platform_zeroize() are not removed by aggressive
 *              compiler optimizations in a portable way. For this reason, Mbed
 *              TLS provides the configuration option
 *              MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure
 *              mbedtls_platform_zeroize() to use a suitable implementation for
 *              their platform and needs
 *
 * \param buf   Buffer to be zeroized
 * \param len   Length of the buffer in bytes
 *
 */
void mbedtls_platform_zeroize( void *buf, size_t len );


#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_PLATFORM_UTIL_H */