/** * \file common.h * * \brief Utility macros for internal use in the library */ /* * Copyright The Mbed TLS Contributors * 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. */ #ifndef MBEDTLS_LIBRARY_COMMON_H #define MBEDTLS_LIBRARY_COMMON_H #if defined(MBEDTLS_CONFIG_FILE) #include MBEDTLS_CONFIG_FILE #else #include "mbedtls/config.h" #endif #include /** Helper to define a function as static except when building invasive tests. * * If a function is only used inside its own source file and should be * declared `static` to allow the compiler to optimize for code size, * but that function has unit tests, define it with * ``` * MBEDTLS_STATIC_TESTABLE int mbedtls_foo(...) { ... } * ``` * and declare it in a header in the `library/` directory with * ``` * #if defined(MBEDTLS_TEST_HOOKS) * int mbedtls_foo(...); * #endif * ``` */ #if defined(MBEDTLS_TEST_HOOKS) #define MBEDTLS_STATIC_TESTABLE #else #define MBEDTLS_STATIC_TESTABLE static #endif /** Allow library to access its structs' private members. * * Although structs defined in header files are publicly available, * their members are private and should not be accessed by the user. */ #define MBEDTLS_ALLOW_PRIVATE_ACCESS /** Byte Reading Macros * * Obtain the most significant byte of x using 0xff * Using MBEDTLS_BYTE_a will shift a*8 bits * to retrieve the next byte of information */ #define MBEDTLS_BYTE_0( x ) ( (uint8_t) ( ( x ) & 0xff ) ) #define MBEDTLS_BYTE_1( x ) ( (uint8_t) ( ( ( x ) >> 8 ) & 0xff ) ) #define MBEDTLS_BYTE_2( x ) ( (uint8_t) ( ( ( x ) >> 16 ) & 0xff ) ) #define MBEDTLS_BYTE_3( x ) ( (uint8_t) ( ( ( x ) >> 24 ) & 0xff ) ) #define MBEDTLS_BYTE_4( x ) ( (uint8_t) ( ( ( x ) >> 32 ) & 0xff ) ) #define MBEDTLS_BYTE_5( x ) ( (uint8_t) ( ( ( x ) >> 40 ) & 0xff ) ) #define MBEDTLS_BYTE_6( x ) ( (uint8_t) ( ( ( x ) >> 48 ) & 0xff ) ) #define MBEDTLS_BYTE_7( x ) ( (uint8_t) ( ( ( x ) >> 56 ) & 0xff ) ) /** * Get the unsigned 32 bits integer corresponding to four bytes in * big-endian order (MSB first). * * \param data Base address of the memory to get the four bytes from. * \param offset Offset from \p base of the first and most significant * byte of the four bytes to build the 32 bits unsigned * integer from. */ #ifndef MBEDTLS_GET_UINT32_BE #define MBEDTLS_GET_UINT32_BE( data , offset ) \ ( \ ( (uint32_t) ( data )[( offset ) ] << 24 ) \ | ( (uint32_t) ( data )[( offset ) + 1] << 16 ) \ | ( (uint32_t) ( data )[( offset ) + 2] << 8 ) \ | ( (uint32_t) ( data )[( offset ) + 3] ) \ ) #endif /** * Put in memory a 32 bits unsigned integer in big-endian order. * * \param n 32 bits unsigned integer to put in memory. * \param data Base address of the memory where to put the 32 * bits unsigned integer in. * \param offset Offset from \p base where to put the most significant * byte of the 32 bits unsigned integer \p n. */ #ifndef MBEDTLS_PUT_UINT32_BE #define MBEDTLS_PUT_UINT32_BE( n, data, offset ) \ do { \ ( data )[( offset ) ] = (unsigned char) ( (n) >> 24 ); \ ( data )[( offset ) + 1] = (unsigned char) ( (n) >> 16 ); \ ( data )[( offset ) + 2] = (unsigned char) ( (n) >> 8 ); \ ( data )[( offset ) + 3] = (unsigned char) ( (n) ); \ } while( 0 ) #endif /** * Get the unsigned 32 bits integer corresponding to four bytes in * little-endian order (LSB first). * * \param data Base address of the memory to get the four bytes from. * \param offset Offset from \p base of the first and least significant * byte of the four bytes to build the 32 bits unsigned * integer from. */ #ifndef MBEDTLS_GET_UINT32_LE #define MBEDTLS_GET_UINT32_LE( data, offset ) \ ( \ ( (uint32_t) ( data )[( offset ) ] ) \ | ( (uint32_t) ( data )[( offset ) + 1] << 8 ) \ | ( (uint32_t) ( data )[( offset ) + 2] << 16 ) \ | ( (uint32_t) ( data )[( offset ) + 3] << 24 ) \ ) #endif /** * Put in memory a 32 bits unsigned integer in little-endian order. * * \param n 32 bits unsigned integer to put in memory. * \param data Base address of the memory where to put the 32 * bits unsigned integer in. * \param offset Offset from \p base where to put the least significant * byte of the 32 bits unsigned integer \p n. */ #ifndef MBEDTLS_PUT_UINT32_LE #define MBEDTLS_PUT_UINT32_LE( n, data, offset ) \ do { \ ( data )[( offset ) ] = (unsigned char) ( ( (n) ) & 0xFF ); \ ( data )[( offset ) + 1] = (unsigned char) ( ( (n) >> 8 ) & 0xFF ); \ ( data )[( offset ) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF ); \ ( data )[( offset ) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF ); \ } while( 0 ) #endif /** * Get the unsigned 16 bits integer corresponding to two bytes in * little-endian order (LSB first). * * \param data Base address of the memory to get the two bytes from. * \param offset Offset from \p base of the first and least significant * byte of the two bytes to build the 16 bits unsigned * integer from. */ #ifndef MBEDTLS_GET_UINT16_LE #define MBEDTLS_GET_UINT16_LE( data, offset ) \ ( \ ( (uint16_t) ( data )[( offset ) ] ) \ | ( (uint16_t) ( data )[( offset ) + 1] << 8 ) \ ) #endif /** * Put in memory a 16 bits unsigned integer in little-endian order. * * \param n 16 bits unsigned integer to put in memory. * \param data Base address of the memory where to put the 16 * bits unsigned integer in. * \param offset Offset from \p base where to put the least significant * byte of the 16 bits unsigned integer \p n. */ #ifndef MBEDTLS_PUT_UINT16_LE #define MBEDTLS_PUT_UINT16_LE( n, data, offset ) \ { \ ( data )[( offset ) ] = (unsigned char) ( ( (n) ) & 0xFF ); \ ( data )[( offset ) + 1] = (unsigned char) ( ( (n) >> 8 ) & 0xFF ); \ } #endif #endif /* MBEDTLS_LIBRARY_COMMON_H */