configs/config-tfm.h

/**
 * \file config-tfm.h
 *
 * \brief TF-M medium profile, adapted to work on other platforms.
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */

/* TF-M medium profile: mbedtls legacy configuration */
#include "../configs/ext/tfm_mbedcrypto_config_profile_medium.h"

/* TF-M medium profile: PSA crypto configuration */
#define MBEDTLS_PSA_CRYPTO_CONFIG_FILE "../configs/ext/crypto_config_profile_medium.h"

/***********************************************************/
/* Tweak the configuration to remove dependencies on TF-M. */
/***********************************************************/

/* MBEDTLS_PSA_CRYPTO_SPM needs third-party files, so disable it. */
#undef MBEDTLS_PSA_CRYPTO_SPM

/* Disable buffer-based memory allocator. This isn't strictly required,
 * but using the native allocator is faster and works better with
 * memory management analysis frameworks such as ASan. */
#undef MBEDTLS_MEMORY_BUFFER_ALLOC_C

// This macro is enabled in TFM Medium but is disabled here because it is
// incompatible with baremetal builds in Mbed TLS.
#undef MBEDTLS_PSA_CRYPTO_STORAGE_C

// This macro is enabled in TFM Medium but is disabled here because it is
// incompatible with baremetal builds in Mbed TLS.
#undef MBEDTLS_ENTROPY_NV_SEED

// These platform-related TF-M settings are not useful here.
#undef MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
#undef MBEDTLS_PLATFORM_STD_MEM_HDR
#undef MBEDTLS_PLATFORM_SNPRINTF_MACRO
#undef MBEDTLS_PLATFORM_PRINTF_ALT
#undef MBEDTLS_PLATFORM_STD_EXIT_SUCCESS
#undef MBEDTLS_PLATFORM_STD_EXIT_FAILURE

/* CCM is the only cipher/AEAD enabled in TF-M configuration files, but it
 * does not need CIPHER_C to be enabled, so we can disable it in order
 * to reduce code size further. */
#undef MBEDTLS_CIPHER_C

/*
 * In order to get an example config that works cleanly out-of-the-box
 * for both baremetal and non-baremetal builds, we detect baremetal builds
 * (either IAR, Arm compiler or __ARM_EABI__ defined), and adjust some
 * variables accordingly.
 */
#if defined(__IAR_SYSTEMS_ICC__) || defined(__ARMCC_VERSION) || defined(__ARM_EABI__)
#define MBEDTLS_NO_PLATFORM_ENTROPY
#else
/* Use built-in platform entropy functions (TF-M provides its own). */
#undef MBEDTLS_NO_PLATFORM_ENTROPY
#endif

/***********************************************************************
 * Local changes to crypto config below this delimiter
 **********************************************************************/

// We expect TF-M to pick this up soon
#define MBEDTLS_BLOCK_CIPHER_NO_DECRYPT