/** * \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 #include /* Define `inline` on some non-C99-compliant compilers. */ #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \ !defined(inline) && !defined(__cplusplus) #define inline __inline #endif /** 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 /** Return an offset into a buffer. * * This is just the addition of an offset to a pointer, except that this * function also accepts an offset of 0 into a buffer whose pointer is null. * (`p + n` has undefined behavior when `p` is null, even when `n == 0`. * A null pointer is a valid buffer pointer when the size is 0, for example * as the result of `malloc(0)` on some platforms.) * * \param p Pointer to a buffer of at least n bytes. * This may be \p NULL if \p n is zero. * \param n An offset in bytes. * \return Pointer to offset \p n in the buffer \p p. * Note that this is only a valid pointer if the size of the * buffer is at least \p n + 1. */ static inline unsigned char *mbedtls_buffer_offset( unsigned char *p, size_t n ) { return( p == NULL ? NULL : p + n ); } /** Return an offset into a read-only buffer. * * Similar to mbedtls_buffer_offset(), but for const pointers. * * \param p Pointer to a buffer of at least n bytes. * This may be \p NULL if \p n is zero. * \param n An offset in bytes. * \return Pointer to offset \p n in the buffer \p p. * Note that this is only a valid pointer if the size of the * buffer is at least \p n + 1. */ static inline const unsigned char *mbedtls_buffer_offset_const( const unsigned char *p, size_t n ) { return( p == NULL ? NULL : p + n ); } /** Byte Reading Macros * * Given a multi-byte integer \p x, MBEDTLS_BYTE_n retrieves the n-th * byte from x, where byte 0 is the least significant byte. */ #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 ) \ { \ ( data )[( offset ) ] = MBEDTLS_BYTE_3( n ); \ ( data )[( offset ) + 1] = MBEDTLS_BYTE_2( n ); \ ( data )[( offset ) + 2] = MBEDTLS_BYTE_1( n ); \ ( data )[( offset ) + 3] = MBEDTLS_BYTE_0( n ); \ } #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 ) \ { \ ( data )[( offset ) ] = MBEDTLS_BYTE_0( n ); \ ( data )[( offset ) + 1] = MBEDTLS_BYTE_1( n ); \ ( data )[( offset ) + 2] = MBEDTLS_BYTE_2( n ); \ ( data )[( offset ) + 3] = MBEDTLS_BYTE_3( n ); \ } #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 ) ] = MBEDTLS_BYTE_0( n ); \ ( data )[( offset ) + 1] = MBEDTLS_BYTE_1( n ); \ } #endif /** * Get the unsigned 16 bits integer corresponding to two bytes in * big-endian order (MSB first). * * \param data Base address of the memory to get the two bytes from. * \param offset Offset from \p base of the first and most significant * byte of the two bytes to build the 16 bits unsigned * integer from. */ #ifndef MBEDTLS_GET_UINT16_BE #define MBEDTLS_GET_UINT16_BE( data, offset ) \ ( \ ( (uint16_t) ( data )[( offset ) ] << 8 ) \ | ( (uint16_t) ( data )[( offset ) + 1] ) \ ) #endif /** * Put in memory a 16 bits unsigned integer in big-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 most significant * byte of the 16 bits unsigned integer \p n. */ #ifndef MBEDTLS_PUT_UINT16_BE #define MBEDTLS_PUT_UINT16_BE( n, data, offset ) \ { \ ( data )[( offset ) ] = MBEDTLS_BYTE_1( n ); \ ( data )[( offset ) + 1] = MBEDTLS_BYTE_0( n ); \ } #endif /** * Get the unsigned 64 bits integer corresponding to eight bytes in * big-endian order (MSB first). * * \param data Base address of the memory to get the eight bytes from. * \param offset Offset from \p base of the first and most significant * byte of the eight bytes to build the 64 bits unsigned * integer from. */ #ifndef MBEDTLS_GET_UINT64_BE #define MBEDTLS_GET_UINT64_BE( data, offset ) \ ( \ ( (uint64_t) ( data )[( offset ) ] << 56 ) \ | ( (uint64_t) ( data )[( offset ) + 1] << 48 ) \ | ( (uint64_t) ( data )[( offset ) + 2] << 40 ) \ | ( (uint64_t) ( data )[( offset ) + 3] << 32 ) \ | ( (uint64_t) ( data )[( offset ) + 4] << 24 ) \ | ( (uint64_t) ( data )[( offset ) + 5] << 16 ) \ | ( (uint64_t) ( data )[( offset ) + 6] << 8 ) \ | ( (uint64_t) ( data )[( offset ) + 7] ) \ ) #endif /** * Put in memory a 64 bits unsigned integer in big-endian order. * * \param n 64 bits unsigned integer to put in memory. * \param data Base address of the memory where to put the 64 * bits unsigned integer in. * \param offset Offset from \p base where to put the most significant * byte of the 64 bits unsigned integer \p n. */ #ifndef MBEDTLS_PUT_UINT64_BE #define MBEDTLS_PUT_UINT64_BE( n, data, offset ) \ { \ ( data )[( offset ) ] = MBEDTLS_BYTE_7( n ); \ ( data )[( offset ) + 1] = MBEDTLS_BYTE_6( n ); \ ( data )[( offset ) + 2] = MBEDTLS_BYTE_5( n ); \ ( data )[( offset ) + 3] = MBEDTLS_BYTE_4( n ); \ ( data )[( offset ) + 4] = MBEDTLS_BYTE_3( n ); \ ( data )[( offset ) + 5] = MBEDTLS_BYTE_2( n ); \ ( data )[( offset ) + 6] = MBEDTLS_BYTE_1( n ); \ ( data )[( offset ) + 7] = MBEDTLS_BYTE_0( n ); \ } #endif /** * Get the unsigned 64 bits integer corresponding to eight bytes in * little-endian order (LSB first). * * \param data Base address of the memory to get the eight bytes from. * \param offset Offset from \p base of the first and least significant * byte of the eight bytes to build the 64 bits unsigned * integer from. */ #ifndef MBEDTLS_GET_UINT64_LE #define MBEDTLS_GET_UINT64_LE( data, offset ) \ ( \ ( (uint64_t) ( data )[( offset ) + 7] << 56 ) \ | ( (uint64_t) ( data )[( offset ) + 6] << 48 ) \ | ( (uint64_t) ( data )[( offset ) + 5] << 40 ) \ | ( (uint64_t) ( data )[( offset ) + 4] << 32 ) \ | ( (uint64_t) ( data )[( offset ) + 3] << 24 ) \ | ( (uint64_t) ( data )[( offset ) + 2] << 16 ) \ | ( (uint64_t) ( data )[( offset ) + 1] << 8 ) \ | ( (uint64_t) ( data )[( offset ) ] ) \ ) #endif /** * Put in memory a 64 bits unsigned integer in little-endian order. * * \param n 64 bits unsigned integer to put in memory. * \param data Base address of the memory where to put the 64 * bits unsigned integer in. * \param offset Offset from \p base where to put the least significant * byte of the 64 bits unsigned integer \p n. */ #ifndef MBEDTLS_PUT_UINT64_LE #define MBEDTLS_PUT_UINT64_LE( n, data, offset ) \ { \ ( data )[( offset ) ] = MBEDTLS_BYTE_0( n ); \ ( data )[( offset ) + 1] = MBEDTLS_BYTE_1( n ); \ ( data )[( offset ) + 2] = MBEDTLS_BYTE_2( n ); \ ( data )[( offset ) + 3] = MBEDTLS_BYTE_3( n ); \ ( data )[( offset ) + 4] = MBEDTLS_BYTE_4( n ); \ ( data )[( offset ) + 5] = MBEDTLS_BYTE_5( n ); \ ( data )[( offset ) + 6] = MBEDTLS_BYTE_6( n ); \ ( data )[( offset ) + 7] = MBEDTLS_BYTE_7( n ); \ } #endif #endif /* MBEDTLS_LIBRARY_COMMON_H */