111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/**
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* \file common.h
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*
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* \brief Utility macros for internal use in the library
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_LIBRARY_COMMON_H
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#define MBEDTLS_LIBRARY_COMMON_H
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#include "mbedtls/build_info.h"
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#include "alignment.h"
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#include <stdint.h>
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#include <stddef.h>
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#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
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!defined(inline) && !defined(__cplusplus)
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#define inline __inline
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#endif
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/** Helper to define a function as static except when building invasive tests.
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*
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* If a function is only used inside its own source file and should be
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* declared `static` to allow the compiler to optimize for code size,
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* but that function has unit tests, define it with
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* ```
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* MBEDTLS_STATIC_TESTABLE int mbedtls_foo(...) { ... }
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* ```
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* and declare it in a header in the `library/` directory with
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* ```
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* #if defined(MBEDTLS_TEST_HOOKS)
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* int mbedtls_foo(...);
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* #endif
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* ```
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*/
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#if defined(MBEDTLS_TEST_HOOKS)
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#define MBEDTLS_STATIC_TESTABLE
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#else
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#define MBEDTLS_STATIC_TESTABLE static
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#endif
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#if defined(MBEDTLS_TEST_HOOKS)
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extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const char * file );
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#define MBEDTLS_TEST_HOOK_TEST_ASSERT( TEST ) \
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do { \
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if( ( ! ( TEST ) ) && ( ( *mbedtls_test_hook_test_fail ) != NULL ) ) \
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{ \
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( *mbedtls_test_hook_test_fail )( #TEST, __LINE__, __FILE__ ); \
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} \
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} while( 0 )
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#else
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#define MBEDTLS_TEST_HOOK_TEST_ASSERT( TEST )
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#endif /* defined(MBEDTLS_TEST_HOOKS) */
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/** Allow library to access its structs' private members.
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*
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* Although structs defined in header files are publicly available,
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* their members are private and should not be accessed by the user.
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*/
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#define MBEDTLS_ALLOW_PRIVATE_ACCESS
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/**
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* Perform a fast block XOR operation, such that
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* r[i] = a[i] ^ b[i] where 0 <= i < n
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*
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* \param r Pointer to result (buffer of at least \p n bytes). \p r
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* may be equal to either \p a or \p b, but behaviour when
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* it overlaps in other ways is undefined.
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* \param a Pointer to input (buffer of at least \p n bytes)
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* \param b Pointer to input (buffer of at least \p n bytes)
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* \param n Number of bytes to process.
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*/
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inline void mbedtls_xor( unsigned char *r, const unsigned char *a, const unsigned char *b, size_t n )
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{
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size_t i;
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for ( i = 0; ( i + 4 ) <= n; i += 4 )
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{
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uint32_t x = mbedtls_get_unaligned_uint32( a + i ) ^ mbedtls_get_unaligned_uint32( b + i );
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mbedtls_put_unaligned_uint32( r + i, x );
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}
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for ( ; i < n; i++ )
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{
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r[i] = a[i] ^ b[i];
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}
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}
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/* Fix MSVC C99 compatible issue
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* MSVC support __func__ from visual studio 2015( 1900 )
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* Use MSVC predefine macro to avoid name check fail.
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*/
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#if (defined(_MSC_VER) && ( _MSC_VER <= 1900 ))
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#define /*no-check-names*/ __func__ __FUNCTION__
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#endif
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#endif /* MBEDTLS_LIBRARY_COMMON_H */
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