text: /**
   *
   * \brief Default mbedTLS configuration options for esp-idf
   *
   *  This set of compile-time options may be used to enable
   *  or disable features selectively, and reduce the global
   *  memory footprint.
   *
   *  Copyright (C) 2006-2015, 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 ESP_CONFIG_H
  #define ESP_CONFIG_H
  
  #include "sdkconfig.h"
  #include "mbedtls/config.h"
  #include "soc/soc_caps.h"
  
  /**
   * \name SECTION: System support
   *
   * This section sets system specific settings.
   * \{
   */
  
  /**
   * \def MBEDTLS_HAVE_TIME
   *
   * System has time.h and time().
   * The time does not need to be correct, only time differences are used,
   * by contrast with MBEDTLS_HAVE_TIME_DATE
   *
   * Comment if your system does not support time functions
   */
  #ifdef CONFIG_MBEDTLS_HAVE_TIME
  #define MBEDTLS_HAVE_TIME
  #else
  #undef MBEDTLS_HAVE_TIME
  #endif
  
  /**
   * \def MBEDTLS_HAVE_TIME_DATE
   *
   * System has time.h and time(), gmtime() and the clock is correct.
   * The time needs to be correct (not necesarily very accurate, but at least
   * the date should be correct). This is used to verify the validity period of
   * X.509 certificates.
   *
   * Comment if your system does not have a correct clock.
   */
  #ifdef CONFIG_MBEDTLS_HAVE_TIME_DATE
  #define MBEDTLS_HAVE_TIME_DATE
  #else
  #undef MBEDTLS_HAVE_TIME_DATE
  #endif
  
  /**
   * \def MBEDTLS_PLATFORM_MEMORY
   *
   * Enable the memory allocation layer.
   *
   * By default mbed TLS uses the system-provided calloc() and free().
   * This allows different allocators (self-implemented or provided) to be
   * provided to the platform abstraction layer.
   *
   * Enabling MBEDTLS_PLATFORM_MEMORY without the
   * MBEDTLS_PLATFORM_{FREE,CALLOC}_MACROs will provide
   * "mbedtls_platform_set_calloc_free()" allowing you to set an alternative calloc() and
   * free() function pointer at runtime.
   *
   * Enabling MBEDTLS_PLATFORM_MEMORY and specifying
   * MBEDTLS_PLATFORM_{CALLOC,FREE}_MACROs will allow you to specify the
   * alternate function at compile time.
   *
   * Requires: MBEDTLS_PLATFORM_C
   *
   * Enable this layer to allow use of alternative memory allocators.
   */
  #define MBEDTLS_PLATFORM_MEMORY
  
  /** Override calloc(), free() except for case where memory allocation scheme is not set to custom */
  #ifndef CONFIG_MBEDTLS_CUSTOM_MEM_ALLOC
  #include "esp_mem.h"
  #define MBEDTLS_PLATFORM_STD_CALLOC		esp_mbedtls_mem_calloc
  #define MBEDTLS_PLATFORM_STD_FREE		esp_mbedtls_mem_free
  #endif
  
  /* \} name SECTION: System support */
  
  /**
   * \name SECTION: mbed TLS feature support
   *
   * This section sets support for features that are or are not needed
   * within the modules that are enabled.
   * \{
   */
  
  /* The following units have ESP32 hardware support,
     uncommenting each _ALT macro will use the
     hardware-accelerated implementation. */
  #ifdef CONFIG_MBEDTLS_HARDWARE_AES
  #define MBEDTLS_AES_ALT
  #else
  #undef MBEDTLS_AES_ALT
  #endif
  
  #ifdef CONFIG_MBEDTLS_HARDWARE_GCM
  #define MBEDTLS_GCM_ALT
  #else
  #undef MBEDTLS_GCM_ALT
  #endif
  
  /* MBEDTLS_SHAxx_ALT to enable hardware SHA support
     with software fallback.
  */
  #ifdef CONFIG_MBEDTLS_HARDWARE_SHA
  #define MBEDTLS_SHA1_ALT
  #define MBEDTLS_SHA256_ALT
  
  #if SOC_SHA_SUPPORT_SHA512
  #define MBEDTLS_SHA512_ALT
  #else
  #undef MBEDTLS_SHA512_ALT
  #endif
  
  #else
  #undef MBEDTLS_SHA1_ALT
  #undef MBEDTLS_SHA256_ALT
  #undef MBEDTLS_SHA512_ALT
  #endif
  
  /* The following MPI (bignum) functions have ESP32 hardware support,
     Uncommenting these macros will use the hardware-accelerated
     implementations.
  */
  #ifdef CONFIG_MBEDTLS_HARDWARE_MPI
  #define MBEDTLS_MPI_EXP_MOD_ALT
  #define MBEDTLS_MPI_MUL_MPI_ALT
  #else
  #undef MBEDTLS_MPI_EXP_MOD_ALT
  #undef MBEDTLS_MPI_MUL_MPI_ALT
  #endif
  
  #ifdef CONFIG_MBEDTLS_ATCA_HW_ECDSA_SIGN
  #define MBEDTLS_ECDSA_SIGN_ALT
  #endif
  
  #ifdef CONFIG_MBEDTLS_ATCA_HW_ECDSA_VERIFY
  #define MBEDTLS_ECDSA_VERIFY_ALT
  #endif
  
  /**
   * \def MBEDTLS_ENTROPY_HARDWARE_ALT
   *
   * Uncomment this macro to let mbed TLS use your own implementation of a
   * hardware entropy collector.
   *
   * Your function must be called \c mbedtls_hardware_poll(), have the same
   * prototype as declared in entropy_poll.h, and accept NULL as first argument.
   *
   * Uncomment to use your own hardware entropy collector.
   */
  #define MBEDTLS_ENTROPY_HARDWARE_ALT
  
  /**
   * \def MBEDTLS_AES_ROM_TABLES
   *
   * Store the AES tables in ROM.
   *
   * Uncomment this macro to store the AES tables in ROM.
   */
  #define MBEDTLS_AES_ROM_TABLES
  
  /**
   * \def MBEDTLS_CIPHER_MODE_CBC
   *
   * Enable Cipher Block Chaining mode (CBC) for symmetric ciphers.
   */
  #define MBEDTLS_CIPHER_MODE_CBC
  
  /**
   * \def MBEDTLS_CIPHER_MODE_CFB
   *
   * Enable Cipher Feedback mode (CFB) for symmetric ciphers.
   */
  #define MBEDTLS_CIPHER_MODE_CFB
  
  /**
   * \def MBEDTLS_CIPHER_MODE_CTR
   *
   * Enable Counter Block Cipher mode (CTR) for symmetric ciphers.
   */
  #define MBEDTLS_CIPHER_MODE_CTR
  
  /**
   * \def MBEDTLS_CIPHER_MODE_OFB
   *
   * Enable Output Feedback mode (OFB) for symmetric ciphers.
   */
  #define MBEDTLS_CIPHER_MODE_OFB
  
  /**
   * \def MBEDTLS_CIPHER_MODE_XTS
   *
   * Enable Xor-encrypt-xor with ciphertext stealing mode (XTS) for AES.
   */
  #define MBEDTLS_CIPHER_MODE_XTS
  
  /**
   * \def MBEDTLS_CIPHER_PADDING_PKCS7
   *
   * MBEDTLS_CIPHER_PADDING_XXX: Uncomment or comment macros to add support for
   * specific padding modes in the cipher layer with cipher modes that support
   * padding (e.g. CBC)
   *
   * If you disable all padding modes, only full blocks can be used with CBC.
   *
   * Enable padding modes in the cipher layer.
   */
  #define MBEDTLS_CIPHER_PADDING_PKCS7
  #define MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS
  #define MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN
  #define MBEDTLS_CIPHER_PADDING_ZEROS
  
  /**
   * \def MBEDTLS_REMOVE_ARC4_CIPHERSUITES & MBEDTLS_ARC4_C
   *
   * MBEDTLS_ARC4_C
   * Enable the ARCFOUR stream cipher.
   *
   * This module enables/disables the following ciphersuites
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_RSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_RSA_WITH_RC4_128_MD5
   *      MBEDTLS_TLS_RSA_PSK_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_PSK_WITH_RC4_128_SHA
   *
   * MBEDTLS_REMOVE_ARC4_CIPHERSUITES
   * This flag removes the ciphersuites based on RC4 from the default list as
   * returned by mbedtls_ssl_list_ciphersuites(). However, it is still possible to
   * enable (some of) them with mbedtls_ssl_conf_ciphersuites() by including them
   * explicitly.
   *
   * Uncomment this macro to remove RC4 ciphersuites by default.
   */
  #ifdef CONFIG_MBEDTLS_RC4_ENABLED
  #define MBEDTLS_ARC4_C
  #undef MBEDTLS_REMOVE_ARC4_CIPHERSUITES
  #elif defined CONFIG_MBEDTLS_RC4_ENABLED_NO_DEFAULT
  #define MBEDTLS_ARC4_C
  #define MBEDTLS_REMOVE_ARC4_CIPHERSUITES
  #else
  #undef MBEDTLS_ARC4_C
  #define MBEDTLS_REMOVE_ARC4_CIPHERSUITES
  #endif
  
  /**
   * \def MBEDTLS_ECP_RESTARTABLE
   *
   * Enable "non-blocking" ECC operations that can return early and be resumed.
   *
   * This allows various functions to pause by returning
   * #MBEDTLS_ERR_ECP_IN_PROGRESS (or, for functions in the SSL module,
   * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) and then be called later again in
   * order to further progress and eventually complete their operation. This is
   * controlled through mbedtls_ecp_set_max_ops() which limits the maximum
   * number of ECC operations a function may perform before pausing; see
   * mbedtls_ecp_set_max_ops() for more information.
   *
   * This is useful in non-threaded environments if you want to avoid blocking
   * for too long on ECC (and, hence, X.509 or SSL/TLS) operations.
   *
   * Uncomment this macro to enable restartable ECC computations.
   *
   * \note  This option only works with the default software implementation of
   *        elliptic curve functionality. It is incompatible with
   *        MBEDTLS_ECP_ALT, MBEDTLS_ECDH_XXX_ALT and MBEDTLS_ECDSA_XXX_ALT.
   */
  #ifdef CONFIG_MBEDTLS_ECP_RESTARTABLE
  #define MBEDTLS_ECP_RESTARTABLE
  #endif
  
  /**
   * \def MBEDTLS_CMAC_C
   *
   * Enable the CMAC (Cipher-based Message Authentication Code) mode for block
   * ciphers.
   *
   * Module:  library/cmac.c
   *
   * Requires: MBEDTLS_AES_C or MBEDTLS_DES_C
   *
   */
  #ifdef CONFIG_MBEDTLS_CMAC_C
  #define MBEDTLS_CMAC_C
  #endif
  
  /**
   * \def MBEDTLS_ECP_DP_SECP192R1_ENABLED
   *
   * MBEDTLS_ECP_XXXX_ENABLED: Enables specific curves within the Elliptic Curve
   * module.  By default all supported curves are enabled.
   *
   * Comment macros to disable the curve and functions for it
   */
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP192R1_ENABLED
  #define MBEDTLS_ECP_DP_SECP192R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP192R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP224R1_ENABLED
  #define MBEDTLS_ECP_DP_SECP224R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP224R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP256R1_ENABLED
  #define MBEDTLS_ECP_DP_SECP256R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP256R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP384R1_ENABLED
  #define MBEDTLS_ECP_DP_SECP384R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP384R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP521R1_ENABLED
  #define MBEDTLS_ECP_DP_SECP521R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP521R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP192K1_ENABLED
  #define MBEDTLS_ECP_DP_SECP192K1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP192K1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP224K1_ENABLED
  #define MBEDTLS_ECP_DP_SECP224K1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP224K1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_SECP256K1_ENABLED
  #define MBEDTLS_ECP_DP_SECP256K1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_SECP256K1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_BP256R1_ENABLED
  #define MBEDTLS_ECP_DP_BP256R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_BP256R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_BP384R1_ENABLED
  #define MBEDTLS_ECP_DP_BP384R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_BP384R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_BP512R1_ENABLED
  #define MBEDTLS_ECP_DP_BP512R1_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_BP512R1_ENABLED
  #endif
  #ifdef CONFIG_MBEDTLS_ECP_DP_CURVE25519_ENABLED
  #define MBEDTLS_ECP_DP_CURVE25519_ENABLED
  #else
  #undef MBEDTLS_ECP_DP_CURVE25519_ENABLED
  #endif
  
  #ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED
  #undef MBEDTLS_ECP_DP_CURVE448_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_ECP_NIST_OPTIM
   *
   * Enable specific 'modulo p' routines for each NIST prime.
   * Depending on the prime and architecture, makes operations 4 to 8 times
   * faster on the corresponding curve.
   *
   * Comment this macro to disable NIST curves optimisation.
   */
  #ifdef CONFIG_MBEDTLS_ECP_NIST_OPTIM
  #define MBEDTLS_ECP_NIST_OPTIM
  #else
  #undef MBEDTLS_ECP_NIST_OPTIM
  #endif
  
  /**
   * \def MBEDTLS_ECDSA_DETERMINISTIC
   *
   * Enable deterministic ECDSA (RFC 6979).
   * Standard ECDSA is "fragile" in the sense that lack of entropy when signing
   * may result in a compromise of the long-term signing key. This is avoided by
   * the deterministic variant.
   *
   * Requires: MBEDTLS_HMAC_DRBG_C
   *
   * Comment this macro to disable deterministic ECDSA.
   */
  #ifdef CONFIG_MBEDTLS_ECDSA_DETERMINISTIC
  #define MBEDTLS_ECDSA_DETERMINISTIC
  #else
  #undef MBEDTLS_ECDSA_DETERMINISTIC
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
   *
   * Enable the PSK based ciphersuite modes in SSL / TLS.
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_PSK_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_PSK_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_PSK_WITH_RC4_128_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_PSK
  #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED
   *
   * Enable the DHE-PSK based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_DHM_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_RC4_128_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_PSK
  #define MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED
   *
   * Enable the ECDHE-PSK based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_ECDH_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_RC4_128_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_PSK
  #define MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
   *
   * Enable the RSA-PSK based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_RSA_C, MBEDTLS_PKCS1_V15,
   *           MBEDTLS_X509_CRT_PARSE_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_RC4_128_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_RSA_PSK
  #define MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
   *
   * Enable the RSA-only based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_RSA_C, MBEDTLS_PKCS1_V15,
   *           MBEDTLS_X509_CRT_PARSE_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_RSA_WITH_RC4_128_MD5
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_RSA
  #define MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
   *
   * Enable the DHE-RSA based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_DHM_C, MBEDTLS_RSA_C, MBEDTLS_PKCS1_V15,
   *           MBEDTLS_X509_CRT_PARSE_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_RSA
  #define MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
   *
   * Enable the ECDHE-RSA based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_ECDH_C, MBEDTLS_RSA_C, MBEDTLS_PKCS1_V15,
   *           MBEDTLS_X509_CRT_PARSE_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_RC4_128_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_RSA
  #define MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
   *
   * Enable the ECDHE-ECDSA based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_ECDH_C, MBEDTLS_ECDSA_C, MBEDTLS_X509_CRT_PARSE_C,
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA
  #define MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED
   *
   * Enable the ECDH-ECDSA based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_ECDH_C, MBEDTLS_X509_CRT_PARSE_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA
  #define MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
   *
   * Enable the ECDH-RSA based ciphersuite modes in SSL / TLS.
   *
   * Requires: MBEDTLS_ECDH_C, MBEDTLS_X509_CRT_PARSE_C
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDH_RSA_WITH_RC4_128_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_ECDH_RSA
  #define MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED
   *
   * Enable the ECJPAKE based ciphersuite modes in SSL / TLS.
   *
   * \warning This is currently experimental. EC J-PAKE support is based on the
   * Thread v1.0.0 specification; incompatible changes to the specification
   * might still happen. For this reason, this is disabled by default.
   *
   * Requires: MBEDTLS_ECJPAKE_C
   *           MBEDTLS_SHA256_C
   *           MBEDTLS_ECP_DP_SECP256R1_ENABLED
   *
   * This enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8
   */
  #ifdef CONFIG_MBEDTLS_KEY_EXCHANGE_ECJPAKE
  #define MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED
  #else
  #undef MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED
  #endif
  
  /**
   * \def MBEDTLS_PK_PARSE_EC_EXTENDED
   *
   * Enhance support for reading EC keys using variants of SEC1 not allowed by
   * RFC 5915 and RFC 5480.
   *
   * Currently this means parsing the SpecifiedECDomain choice of EC
   * parameters (only known groups are supported, not arbitrary domains, to
   * avoid validation issues).
   *
   * Disable if you only need to support RFC 5915 + 5480 key formats.
   */
  #define MBEDTLS_PK_PARSE_EC_EXTENDED
  
  /**
   * \def MBEDTLS_ERROR_STRERROR_DUMMY
   *
   * Enable a dummy error function to make use of mbedtls_strerror() in
   * third party libraries easier when MBEDTLS_ERROR_C is disabled
   * (no effect when MBEDTLS_ERROR_C is enabled).
   *
   * You can safely disable this if MBEDTLS_ERROR_C is enabled, or if you're
   * not using mbedtls_strerror() or error_strerror() in your application.
   *
   * Disable if you run into name conflicts and want to really remove the
   * mbedtls_strerror()
   */
  #define MBEDTLS_ERROR_STRERROR_DUMMY
  
  /**
   * \def MBEDTLS_GENPRIME
   *
   * Enable the prime-number generation code.
   *
   * Requires: MBEDTLS_BIGNUM_C
   */
  #define MBEDTLS_GENPRIME
  
  /**
   * \def MBEDTLS_FS_IO
   *
   * Enable functions that use the filesystem.
   */
  #define MBEDTLS_FS_IO
  
  /**
   * \def MBEDTLS_NO_PLATFORM_ENTROPY
   *
   * Do not use built-in platform entropy functions.
   * This is useful if your platform does not support
   * standards like the /dev/urandom or Windows CryptoAPI.
   *
   * Uncomment this macro to disable the built-in platform entropy functions.
   */
  #define MBEDTLS_NO_PLATFORM_ENTROPY
  
  /**
   * \def MBEDTLS_PK_RSA_ALT_SUPPORT
   *
   * Support external private RSA keys (eg from a HSM) in the PK layer.
   *
   * Comment this macro to disable support for external private RSA keys.
   */
  #define MBEDTLS_PK_RSA_ALT_SUPPORT
  
  /**
   * \def MBEDTLS_PKCS1_V15
   *
   * Enable support for PKCS#1 v1.5 encoding.
   *
   * Requires: MBEDTLS_RSA_C
   *
   * This enables support for PKCS#1 v1.5 operations.
   */
  #define MBEDTLS_PKCS1_V15
  
  /**
   * \def MBEDTLS_PKCS1_V21
   *
   * Enable support for PKCS#1 v2.1 encoding.
   *
   * Requires: MBEDTLS_MD_C, MBEDTLS_RSA_C
   *
   * This enables support for RSAES-OAEP and RSASSA-PSS operations.
   */
  #define MBEDTLS_PKCS1_V21
  
  /**
   * \def MBEDTLS_SELF_TEST
   *
   * Enable the checkup functions (*_self_test).
   */
  #define MBEDTLS_SELF_TEST
  
  /**
   * \def MBEDTLS_SSL_ALL_ALERT_MESSAGES
   *
   * Enable sending of alert messages in case of encountered errors as per RFC.
   * If you choose not to send the alert messages, mbed TLS can still communicate
   * with other servers, only debugging of failures is harder.
   *
   * The advantage of not sending alert messages, is that no information is given
   * about reasons for failures thus preventing adversaries of gaining intel.
   *
   * Enable sending of all alert messages
   */
  #define MBEDTLS_SSL_ALL_ALERT_MESSAGES
  
  /** \def MBEDTLS_SSL_ENCRYPT_THEN_MAC
   *
   * Enable support for Encrypt-then-MAC, RFC 7366.
   *
   * This allows peers that both support it to use a more robust protection for
   * ciphersuites using CBC, providing deep resistance against timing attacks
   * on the padding or underlying cipher.
   *
   * This only affects CBC ciphersuites, and is useless if none is defined.
   *
   * Requires: MBEDTLS_SSL_PROTO_TLS1    or
   *           MBEDTLS_SSL_PROTO_TLS1_1  or
   *           MBEDTLS_SSL_PROTO_TLS1_2
   *
   * Comment this macro to disable support for Encrypt-then-MAC
   */
  #ifdef CONFIG_MBEDTLS_TLS_ENABLED
  #define MBEDTLS_SSL_ENCRYPT_THEN_MAC
  #else
  #undef MBEDTLS_SSL_ENCRYPT_THEN_MAC
  #endif
  
  /** \def MBEDTLS_SSL_EXTENDED_MASTER_SECRET
   *
   * Enable support for Extended Master Secret, aka Session Hash
   * (draft-ietf-tls-session-hash-02).
   *
   * This was introduced as "the proper fix" to the Triple Handshake familiy of
   * attacks, but it is recommended to always use it (even if you disable
   * renegotiation), since it actually fixes a more fundamental issue in the
   * original SSL/TLS design, and has implications beyond Triple Handshake.
   *
   * Requires: MBEDTLS_SSL_PROTO_TLS1    or
   *           MBEDTLS_SSL_PROTO_TLS1_1  or
   *           MBEDTLS_SSL_PROTO_TLS1_2
   *
   * Comment this macro to disable support for Extended Master Secret.
   */
  #ifdef CONFIG_MBEDTLS_TLS_ENABLED
  #define MBEDTLS_SSL_EXTENDED_MASTER_SECRET
  #else
  #undef MBEDTLS_SSL_EXTENDED_MASTER_SECRET
  #endif
  
  /**
   * \def MBEDTLS_SSL_FALLBACK_SCSV
   *
   * Enable support for FALLBACK_SCSV (draft-ietf-tls-downgrade-scsv-00).
   *
   * For servers, it is recommended to always enable this, unless you support
   * only one version of TLS, or know for sure that none of your clients
   * implements a fallback strategy.
   *
   * For clients, you only need this if you're using a fallback strategy, which
   * is not recommended in the first place, unless you absolutely need it to
   * interoperate with buggy (version-intolerant) servers.
   *
   * Comment this macro to disable support for FALLBACK_SCSV
   */
  #define MBEDTLS_SSL_FALLBACK_SCSV
  
  /**
   * \def MBEDTLS_SSL_PROTO_TLS1
   *
   * Enable support for TLS 1.0.
   *
   * Requires: MBEDTLS_MD5_C
   *           MBEDTLS_SHA1_C
   *
   * Comment this macro to disable support for TLS 1.0
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_TLS1
  #define MBEDTLS_SSL_PROTO_TLS1
  #else
  #undef MBEDTLS_SSL_PROTO_TLS1
  #endif
  
  /**
   * \def MBEDTLS_SSL_PROTO_SSL3
   *
   * Enable support for SSL 3.0.
   *
   * Requires: MBEDTLS_MD5_C
   *           MBEDTLS_SHA1_C
   *
   * Comment this macro to disable support for SSL 3.0
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_SSL3
  #define MBEDTLS_SSL_PROTO_SSL3
  #else
  #undef MBEDTLS_SSL_PROTO_SSL3
  #endif
  
  /**
   * \def MBEDTLS_SSL_CBC_RECORD_SPLITTING
   *
   * Enable 1/n-1 record splitting for CBC mode in SSLv3 and TLS 1.0.
   *
   * This is a countermeasure to the BEAST attack, which also minimizes the risk
   * of interoperability issues compared to sending 0-length records.
   *
   * Comment this macro to disable 1/n-1 record splitting.
   */
  #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
  #define MBEDTLS_SSL_CBC_RECORD_SPLITTING
  #else
  #undef MBEDTLS_SSL_CBC_RECORD_SPLITTING
  #endif
  
  /**
   * \def MBEDTLS_SSL_RENEGOTIATION
   *
   * Disable support for TLS renegotiation.
   *
   * The two main uses of renegotiation are (1) refresh keys on long-lived
   * connections and (2) client authentication after the initial handshake.
   * If you don't need renegotiation, it's probably better to disable it, since
   * it has been associated with security issues in the past and is easy to
   * misuse/misunderstand.
   *
   * Comment this to disable support for renegotiation.
   */
  #ifdef CONFIG_MBEDTLS_SSL_RENEGOTIATION
  #define MBEDTLS_SSL_RENEGOTIATION
  #else
  #undef MBEDTLS_SSL_RENEGOTIATION
  #endif
  
  /**
   * \def MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
   *
   * Enable support for RFC 6066 max_fragment_length extension in SSL.
   *
   * Comment this macro to disable support for the max_fragment_length extension
   */
  #define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
  
  /**
   * \def MBEDTLS_SSL_PROTO_TLS1_1
   *
   * Enable support for TLS 1.1 (and DTLS 1.0 if DTLS is enabled).
   *
   * Requires: MBEDTLS_MD5_C
   *           MBEDTLS_SHA1_C
   *
   * Comment this macro to disable support for TLS 1.1 / DTLS 1.0
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_TLS1_1
  #define MBEDTLS_SSL_PROTO_TLS1_1
  #else
  #undef MBEDTLS_SSL_PROTO_TLS1_1
  #endif
  
  /**
   * \def MBEDTLS_SSL_PROTO_TLS1_2
   *
   * Enable support for TLS 1.2 (and DTLS 1.2 if DTLS is enabled).
   *
   * Requires: MBEDTLS_SHA1_C or MBEDTLS_SHA256_C or MBEDTLS_SHA512_C
   *           (Depends on ciphersuites)
   *
   * Comment this macro to disable support for TLS 1.2 / DTLS 1.2
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_TLS1_2
  #define MBEDTLS_SSL_PROTO_TLS1_2
  #else
  #undef MBEDTLS_SSL_PROTO_TLS1_2
  #endif
  
  /**
   * \def MBEDTLS_SSL_PROTO_DTLS
   *
   * Enable support for DTLS (all available versions).
   *
   * Enable this and MBEDTLS_SSL_PROTO_TLS1_1 to enable DTLS 1.0,
   * and/or this and MBEDTLS_SSL_PROTO_TLS1_2 to enable DTLS 1.2.
   *
   * Requires: MBEDTLS_SSL_PROTO_TLS1_1
   *        or MBEDTLS_SSL_PROTO_TLS1_2
   *
   * Comment this macro to disable support for DTLS
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_DTLS
  #define MBEDTLS_SSL_PROTO_DTLS
  #else
  #undef MBEDTLS_SSL_PROTO_DTLS
  #endif
  
  /**
   * \def MBEDTLS_SSL_ALPN
   *
   * Enable support for RFC 7301 Application Layer Protocol Negotiation.
   *
   * Comment this macro to disable support for ALPN.
   */
  #ifdef CONFIG_MBEDTLS_SSL_ALPN
  #define MBEDTLS_SSL_ALPN
  #else
  #undef MBEDTLS_SSL_ALPN
  #endif
  
  /**
   * \def MBEDTLS_SSL_DTLS_ANTI_REPLAY
   *
   * Enable support for the anti-replay mechanism in DTLS.
   *
   * Requires: MBEDTLS_SSL_TLS_C
   *           MBEDTLS_SSL_PROTO_DTLS
   *
   * \warning Disabling this is often a security risk!
   * See mbedtls_ssl_conf_dtls_anti_replay() for details.
   *
   * Comment this to disable anti-replay in DTLS.
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_DTLS
  #define MBEDTLS_SSL_DTLS_ANTI_REPLAY
  #else
  #undef MBEDTLS_SSL_DTLS_ANTI_REPLAY
  #endif
  
  /**
   * \def MBEDTLS_SSL_DTLS_HELLO_VERIFY
   *
   * Enable support for HelloVerifyRequest on DTLS servers.
   *
   * This feature is highly recommended to prevent DTLS servers being used as
   * amplifiers in DoS attacks against other hosts. It should always be enabled
   * unless you know for sure amplification cannot be a problem in the
   * environment in which your server operates.
   *
   * \warning Disabling this can ba a security risk! (see above)
   *
   * Requires: MBEDTLS_SSL_PROTO_DTLS
   *
   * Comment this to disable support for HelloVerifyRequest.
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_DTLS
  #define MBEDTLS_SSL_DTLS_HELLO_VERIFY
  #else
  #undef MBEDTLS_SSL_DTLS_HELLO_VERIFY
  #endif
  
  /**
   * \def MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE
   *
   * Enable server-side support for clients that reconnect from the same port.
   *
   * Some clients unexpectedly close the connection and try to reconnect using the
   * same source port. This needs special support from the server to handle the
   * new connection securely, as described in section 4.2.8 of RFC 6347. This
   * flag enables that support.
   *
   * Requires: MBEDTLS_SSL_DTLS_HELLO_VERIFY
   *
   * Comment this to disable support for clients reusing the source port.
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_DTLS
  #define MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE
  #else
  #undef MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE
  #endif
  
  /**
   * \def MBEDTLS_SSL_DTLS_BADMAC_LIMIT
   *
   * Enable support for a limit of records with bad MAC.
   *
   * See mbedtls_ssl_conf_dtls_badmac_limit().
   *
   * Requires: MBEDTLS_SSL_PROTO_DTLS
   */
  #ifdef CONFIG_MBEDTLS_SSL_PROTO_DTLS
  #define MBEDTLS_SSL_DTLS_BADMAC_LIMIT
  #else
  #undef MBEDTLS_SSL_DTLS_BADMAC_LIMIT
  #endif
  
  /**
   * \def MBEDTLS_SSL_SESSION_TICKETS
   *
   * Enable support for RFC 5077 session tickets in SSL.
   * Client-side, provides full support for session tickets (maintainance of a
   * session store remains the responsibility of the application, though).
   * Server-side, you also need to provide callbacks for writing and parsing
   * tickets, including authenticated encryption and key management. Example
   * callbacks are provided by MBEDTLS_SSL_TICKET_C.
   *
   * Comment this macro to disable support for SSL session tickets
   */
  #ifdef CONFIG_MBEDTLS_CLIENT_SSL_SESSION_TICKETS
  #define MBEDTLS_SSL_SESSION_TICKETS
  #else
  #undef MBEDTLS_SSL_SESSION_TICKETS
  #endif
  
  /**
   * \def MBEDTLS_SSL_EXPORT_KEYS
   *
   * Enable support for exporting key block and master secret.
   * This is required for certain users of TLS, e.g. EAP-TLS.
   *
   * Comment this macro to disable support for key export
   */
  #define MBEDTLS_SSL_EXPORT_KEYS
  
  /**
   * \def MBEDTLS_SSL_SERVER_NAME_INDICATION
   *
   * Enable support for RFC 6066 server name indication (SNI) in SSL.
   *
   * Requires: MBEDTLS_X509_CRT_PARSE_C
   *
   * Comment this macro to disable support for server name indication in SSL
   */
  #define MBEDTLS_SSL_SERVER_NAME_INDICATION
  
  /**
   * \def MBEDTLS_SSL_TRUNCATED_HMAC
   *
   * Enable support for RFC 6066 truncated HMAC in SSL.
   *
   * Comment this macro to disable support for truncated HMAC in SSL
   */
  #define MBEDTLS_SSL_TRUNCATED_HMAC
  
  /**
   * \def MBEDTLS_VERSION_FEATURES
   *
   * Allow run-time checking of compile-time enabled features. Thus allowing users
   * to check at run-time if the library is for instance compiled with threading
   * support via mbedtls_version_check_feature().
   *
   * Requires: MBEDTLS_VERSION_C
   *
   * Comment this to disable run-time checking and save ROM space
   */
  #define MBEDTLS_VERSION_FEATURES
  
  /**
   * \def MBEDTLS_X509_CHECK_KEY_USAGE
   *
   * Enable verification of the keyUsage extension (CA and leaf certificates).
   *
   * Disabling this avoids problems with mis-issued and/or misused
   * (intermediate) CA and leaf certificates.
   *
   * \warning Depending on your PKI use, disabling this can be a security risk!
   *
   * Comment to skip keyUsage checking for both CA and leaf certificates.
   */
  #define MBEDTLS_X509_CHECK_KEY_USAGE
  
  /**
   * \def MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
   *
   * Enable verification of the extendedKeyUsage extension (leaf certificates).
   *
   * Disabling this avoids problems with mis-issued and/or misused certificates.
   *
   * \warning Depending on your PKI use, disabling this can be a security risk!
   *
   * Comment to skip extendedKeyUsage checking for certificates.
   */
  #define MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
  
  /**
   * \def MBEDTLS_X509_RSASSA_PSS_SUPPORT
   *
   * Enable parsing and verification of X.509 certificates, CRLs and CSRS
   * signed with RSASSA-PSS (aka PKCS#1 v2.1).
   *
   * Comment this macro to disallow using RSASSA-PSS in certificates.
   */
  #define MBEDTLS_X509_RSASSA_PSS_SUPPORT
  
  
  /* \} name SECTION: mbed TLS feature support */
  
  /**
   * \name SECTION: mbed TLS modules
   *
   * This section enables or disables entire modules in mbed TLS
   * \{
   */
  
  /**
   * \def MBEDTLS_AESNI_C
   *
   * Enable AES-NI support on x86-64.
   *
   * Module:  library/aesni.c
   * Caller:  library/aes.c
   *
   * Requires: MBEDTLS_HAVE_ASM
   *
   * This modules adds support for the AES-NI instructions on x86-64
   */
  #define MBEDTLS_AESNI_C
  
  /**
   * \def MBEDTLS_AES_C
   *
   * Enable the AES block cipher.
   *
   * Module:  library/aes.c
   * Caller:  library/ssl_tls.c
   *          library/pem.c
   *          library/ctr_drbg.c
   *
   * This module enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_AES_128_CBC_SHA
   *      MBEDTLS_TLS_PSK_WITH_AES_256_GCM_SHA384
   *      MBEDTLS_TLS_PSK_WITH_AES_256_CBC_SHA384
   *      MBEDTLS_TLS_PSK_WITH_AES_256_CBC_SHA
   *      MBEDTLS_TLS_PSK_WITH_AES_128_GCM_SHA256
   *      MBEDTLS_TLS_PSK_WITH_AES_128_CBC_SHA256
   *      MBEDTLS_TLS_PSK_WITH_AES_128_CBC_SHA
   *
   * PEM_PARSE uses AES for decrypting encrypted keys.
   */
  #ifdef CONFIG_MBEDTLS_AES_C
  #define MBEDTLS_AES_C
  #else
  #undef MBEDTLS_AES_C
  #endif
  
  /**
   * \def MBEDTLS_ASN1_PARSE_C
   *
   * Enable the generic ASN1 parser.
   *
   * Module:  library/asn1.c
   * Caller:  library/x509.c
   *          library/dhm.c
   *          library/pkcs12.c
   *          library/pkcs5.c
   *          library/pkparse.c
   */
  #define MBEDTLS_ASN1_PARSE_C
  
  /**
   * \def MBEDTLS_ASN1_WRITE_C
   *
   * Enable the generic ASN1 writer.
   *
   * Module:  library/asn1write.c
   * Caller:  library/ecdsa.c
   *          library/pkwrite.c
   *          library/x509_create.c
   *          library/x509write_crt.c
   *          library/mbedtls_x509write_csr.c
   */
  #define MBEDTLS_ASN1_WRITE_C
  
  /**
   * \def MBEDTLS_BASE64_C
   *
   * Enable the Base64 module.
   *
   * Module:  library/base64.c
   * Caller:  library/pem.c
   *
   * This module is required for PEM support (required by X.509).
   */
  #define MBEDTLS_BASE64_C
  
  /**
   * \def MBEDTLS_BIGNUM_C
   *
   * Enable the multi-precision integer library.
   *
   * Module:  library/bignum.c
   * Caller:  library/dhm.c
   *          library/ecp.c
   *          library/ecdsa.c
   *          library/rsa.c
   *          library/ssl_tls.c
   *
   * This module is required for RSA, DHM and ECC (ECDH, ECDSA) support.
   */
  #define MBEDTLS_BIGNUM_C
  
  /**
   * \def MBEDTLS_BLOWFISH_C
   *
   * Enable the Blowfish block cipher.
   *
   * Module:  library/blowfish.c
   */
  #ifdef CONFIG_MBEDTLS_BLOWFISH_C
  #define MBEDTLS_BLOWFISH_C
  #else
  #undef MBEDTLS_BLOWFISH_C
  #endif
  
  /**
   * \def MBEDTLS_CAMELLIA_C
   *
   * Enable the Camellia block cipher.
   *
   * Module:  library/camellia.c
   * Caller:  library/ssl_tls.c
   *
   * This module enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_DHE_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_RSA_PSK_WITH_CAMELLIA_128_CBC_SHA256
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_256_GCM_SHA384
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_256_CBC_SHA384
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_128_GCM_SHA256
   *      MBEDTLS_TLS_PSK_WITH_CAMELLIA_128_CBC_SHA256
   */
  #ifdef CONFIG_MBEDTLS_CAMELLIA_C
  #define MBEDTLS_CAMELLIA_C
  #else
  #undef MBEDTLS_CAMELLIA_C
  #endif
  
  /**
   * \def MBEDTLS_CCM_C
   *
   * Enable the Counter with CBC-MAC (CCM) mode for 128-bit block cipher.
   *
   * Module:  library/ccm.c
   *
   * Requires: MBEDTLS_AES_C or MBEDTLS_CAMELLIA_C
   *
   * This module enables the AES-CCM ciphersuites, if other requisites are
   * enabled as well.
   */
  #ifdef CONFIG_MBEDTLS_CCM_C
  #define MBEDTLS_CCM_C
  #else
  #undef MBEDTLS_CCM_C
  #endif
  
  /**
   * \def MBEDTLS_CERTS_C
   *
   * Enable the test certificates.
   *
   * Module:  library/certs.c
   * Caller:
   *
   * This module is used for testing (ssl_client/server).
   */
  #define MBEDTLS_CERTS_C
  
  /**
   * \def MBEDTLS_CHACHA20_C
   *
   * Enable the ChaCha20 stream cipher.
   *
   * Module:  library/chacha20.c
   */
  #ifdef CONFIG_MBEDTLS_CHACHA20_C
  #define MBEDTLS_CHACHA20_C
  #else
  #undef MBEDTLS_CHACHA20_C
  #endif
  
  /**
   * \def MBEDTLS_CHACHAPOLY_C
   *
   * Enable the ChaCha20-Poly1305 AEAD algorithm.
   *
   * Module:  library/chachapoly.c
   *
   * This module requires: MBEDTLS_CHACHA20_C, MBEDTLS_POLY1305_C
   */
  #ifdef CONFIG_MBEDTLS_CHACHAPOLY_C
  #define MBEDTLS_CHACHAPOLY_C
  #else
  #undef MBEDTLS_CHACHAPOLY_C
  #endif
  
  /**
   * \def MBEDTLS_CIPHER_C
   *
   * Enable the generic cipher layer.
   *
   * Module:  library/cipher.c
   * Caller:  library/ssl_tls.c
   *
   * Uncomment to enable generic cipher wrappers.
   */
  #define MBEDTLS_CIPHER_C
  
  /**
   * \def MBEDTLS_CTR_DRBG_C
   *
   * Enable the CTR_DRBG AES-256-based random generator.
   *
   * Module:  library/ctr_drbg.c
   * Caller:
   *
   * Requires: MBEDTLS_AES_C
   *
   * This module provides the CTR_DRBG AES-256 random number generator.
   */
  #define MBEDTLS_CTR_DRBG_C
  
  /**
   * \def MBEDTLS_DEBUG_C
   *
   * Enable the debug functions.
   *
   * Module:  library/debug.c
   * Caller:  library/ssl_cli.c
   *          library/ssl_srv.c
   *          library/ssl_tls.c
   *
   * This module provides debugging functions.
   */
  #if CONFIG_MBEDTLS_DEBUG
  #define MBEDTLS_DEBUG_C
  #else
  #undef MBEDTLS_DEBUG_C
  #endif
  
  /**
   * \def MBEDTLS_DES_C
   *
   * Enable the DES block cipher.
   *
   * Module:  library/des.c
   * Caller:  library/pem.c
   *          library/ssl_tls.c
   *
   * This module enables the following ciphersuites (if other requisites are
   * enabled as well):
   *      MBEDTLS_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_RSA_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA
   *      MBEDTLS_TLS_PSK_WITH_3DES_EDE_CBC_SHA
   *
   * PEM_PARSE uses DES/3DES for decrypting encrypted keys.
   */
  #ifdef CONFIG_MBEDTLS_DES_C
  #define MBEDTLS_DES_C
  #else
  #undef MBEDTLS_DES_C
  #endif
  
  /**
   * \def MBEDTLS_DHM_C
   *
   * Enable the Diffie-Hellman-Merkle module.
   *
   * Module:  library/dhm.c
   * Caller:  library/ssl_cli.c
   *          library/ssl_srv.c
   *
   * This module is used by the following key exchanges:
   *      DHE-RSA, DHE-PSK
   */
  #define MBEDTLS_DHM_C
  
  /**
   * \def MBEDTLS_ECDH_C
   *
   * Enable the elliptic curve Diffie-Hellman library.
   *
   * Module:  library/ecdh.c
   * Caller:  library/ssl_cli.c
   *          library/ssl_srv.c
   *
   * This module is used by the following key exchanges:
   *      ECDHE-ECDSA, ECDHE-RSA, DHE-PSK
   *
   * Requires: MBEDTLS_ECP_C
   */
  #ifdef CONFIG_MBEDTLS_ECDH_C
  #define MBEDTLS_ECDH_C
  #else
  #undef MBEDTLS_ECDH_C
  #endif
  
  /**
   * \def MBEDTLS_ECDSA_C
   *
   * Enable the elliptic curve DSA library.
   *
   * Module:  library/ecdsa.c
   * Caller:
   *
   * This module is used by the following key exchanges:
   *      ECDHE-ECDSA
   *
   * Requires: MBEDTLS_ECP_C, MBEDTLS_ASN1_WRITE_C, MBEDTLS_ASN1_PARSE_C
   */
  #ifdef CONFIG_MBEDTLS_ECDSA_C
  #define MBEDTLS_ECDSA_C
  #else
  #undef MBEDTLS_ECDSA_C
  #endif
  
  /**
   * \def MBEDTLS_ECJPAKE_C
   *
   * Enable the elliptic curve J-PAKE library.
   *
   * \warning This is currently experimental. EC J-PAKE support is based on the
   * Thread v1.0.0 specification; incompatible changes to the specification
   * might still happen. For this reason, this is disabled by default.
   *
   * Module:  library/ecjpake.c
   * Caller:
   *
   * This module is used by the following key exchanges:
   *      ECJPAKE
   *
   * Requires: MBEDTLS_ECP_C, MBEDTLS_MD_C
   */
  #ifdef CONFIG_MBEDTLS_ECJPAKE_C
  #define MBEDTLS_ECJPAKE_C
  #else
  #undef MBEDTLS_ECJPAKE_C
  #endif
  
  /**
   * \def MBEDTLS_ECP_C
   *
   * Enable the elliptic curve over GF(p) library.
   *
   * Module:  library/ecp.c
   * Caller:  library/ecdh.c
   *          library/ecdsa.c
   *          library/ecjpake.c
   *
   * Requires: MBEDTLS_BIGNUM_C and at least one MBEDTLS_ECP_DP_XXX_ENABLED
   */
  #ifdef CONFIG_MBEDTLS_ECP_C
  #define MBEDTLS_ECP_C
  #else
  #undef MBEDTLS_ECP_C
  #endif
  
  /**
   * \def MBEDTLS_ENTROPY_C
   *
   * Enable the platform-specific entropy code.
   *
   * Module:  library/entropy.c
   * Caller:
   *
   * Requires: MBEDTLS_SHA512_C or MBEDTLS_SHA256_C
   *
   * This module provides a generic entropy pool
   */
  #define MBEDTLS_ENTROPY_C
  
  /**
   * \def MBEDTLS_ERROR_C
   *
   * Enable error code to error string conversion.
   *
   * Module:  library/error.c
   * Caller:
   *
   * This module enables mbedtls_strerror().
   */
  #define MBEDTLS_ERROR_C
  
  /**
   * \def MBEDTLS_GCM_C
   *
   * Enable the Galois/Counter Mode (GCM) for AES.
   *
   * Module:  library/gcm.c
   *
   * Requires: MBEDTLS_AES_C or MBEDTLS_CAMELLIA_C
   *
   * This module enables the AES-GCM and CAMELLIA-GCM ciphersuites, if other
   * requisites are enabled as well.
   */
  #ifdef CONFIG_MBEDTLS_GCM_C
  #define MBEDTLS_GCM_C
  #else
  #undef MBEDTLS_GCM_C
  #endif
  
  /**
   * \def MBEDTLS_HKDF_C
   *
   * Enable the HKDF algorithm (RFC 5869).
   *
   * Module:  library/hkdf.c
   * Caller:
   *
   * Requires: MBEDTLS_MD_C
   *
   * This module enables support for the Hashed Message Authentication Code
   * (HMAC)-based key derivation function (HKDF).
   */
  #ifdef CONFIG_MBEDTLS_HKDF_C
  #define MBEDTLS_HKDF_C
  #else
  #undef MBEDTLS_HKDF_C
  #endif
  
  /**
   * \def MBEDTLS_HMAC_DRBG_C
   *
   * Enable the HMAC_DRBG random generator.
   *
   * Module:  library/hmac_drbg.c
   * Caller:
   *
   * Requires: MBEDTLS_MD_C
   *
   * Uncomment to enable the HMAC_DRBG random number geerator.
   */
  #define MBEDTLS_HMAC_DRBG_C
  
  /**
   * \def MBEDTLS_MD_C
   *
   * Enable the generic message digest layer.
   *
   * Module:  library/mbedtls_md.c
   * Caller:
   *
   * Uncomment to enable generic message digest wrappers.
   */
  #define MBEDTLS_MD_C
  
  /**
   * \def MBEDTLS_MD5_C
   *
   * Enable the MD5 hash algorithm.
   *
   * Module:  library/mbedtls_md5.c
   * Caller:  library/mbedtls_md.c
   *          library/pem.c
   *          library/ssl_tls.c
   *
   * This module is required for SSL/TLS and X.509.
   * PEM_PARSE uses MD5 for decrypting encrypted keys.
   */
  #define MBEDTLS_MD5_C
  
  /**
   * \def MBEDTLS_NET_C
   *
   * Enable the TCP/IP networking routines.
   *
   * Module:  library/net.c
   *
   * This module provides TCP/IP networking routines.
   */
  #ifdef MBEDTLS_NET_C
  #undef MBEDTLS_NET_C
  #endif
  
  /**
   * \def MBEDTLS_OID_C
   *
   * Enable the OID database.
   *
   * Module:  library/oid.c
   * Caller:  library/asn1write.c
   *          library/pkcs5.c
   *          library/pkparse.c
   *          library/pkwrite.c
   *          library/rsa.c
   *          library/x509.c
   *          library/x509_create.c
   *          library/mbedtls_x509_crl.c
   *          library/mbedtls_x509_crt.c
   *          library/mbedtls_x509_csr.c
   *          library/x509write_crt.c
   *          library/mbedtls_x509write_csr.c
   *
   * This modules translates between OIDs and internal values.
   */
  #define MBEDTLS_OID_C
  
  /**
   * \def MBEDTLS_PADLOCK_C
   *
   * Enable VIA Padlock support on x86.
   *
   * Module:  library/padlock.c
   * Caller:  library/aes.c
   *
   * Requires: MBEDTLS_HAVE_ASM
   *
   * This modules adds support for the VIA PadLock on x86.
   */
  #define MBEDTLS_PADLOCK_C
  
  /**
   * \def MBEDTLS_PEM_PARSE_C
   *
   * Enable PEM decoding / parsing.
   *
   * Module:  library/pem.c
   * Caller:  library/dhm.c
   *          library/pkparse.c
   *          library/mbedtls_x509_crl.c
   *          library/mbedtls_x509_crt.c
   *          library/mbedtls_x509_csr.c
   *
   * Requires: MBEDTLS_BASE64_C
   *
   * This modules adds support for decoding / parsing PEM files.
   */
  #ifdef CONFIG_MBEDTLS_PEM_PARSE_C
  #define MBEDTLS_PEM_PARSE_C
  #else
  #undef MBEDTLS_PEM_PARSE_C
  #endif
  
  /**
   * \def MBEDTLS_PEM_WRITE_C
   *
   * Enable PEM encoding / writing.
   *
   * Module:  library/pem.c
   * Caller:  library/pkwrite.c
   *          library/x509write_crt.c
   *          library/mbedtls_x509write_csr.c
   *
   * Requires: MBEDTLS_BASE64_C
   *
   * This modules adds support for encoding / writing PEM files.
   */
  #ifdef CONFIG_MBEDTLS_PEM_WRITE_C
  #define MBEDTLS_PEM_WRITE_C
  #else
  #undef MBEDTLS_PEM_WRITE_C
  #endif
  
  /**
   * \def MBEDTLS_PK_C
   *
   * Enable the generic public (asymetric) key layer.
   *
   * Module:  library/pk.c
   * Caller:  library/ssl_tls.c
   *          library/ssl_cli.c
   *          library/ssl_srv.c
   *
   * Requires: MBEDTLS_RSA_C or MBEDTLS_ECP_C
   *
   * Uncomment to enable generic public key wrappers.
   */
  #define MBEDTLS_PK_C
  
  /**
   * \def MBEDTLS_PK_PARSE_C
   *
   * Enable the generic public (asymetric) key parser.
   *
   * Module:  library/pkparse.c
   * Caller:  library/mbedtls_x509_crt.c
   *          library/mbedtls_x509_csr.c
   *
   * Requires: MBEDTLS_PK_C
   *
   * Uncomment to enable generic public key parse functions.
   */
  #define MBEDTLS_PK_PARSE_C
  
  /**
   * \def MBEDTLS_PK_WRITE_C
   *
   * Enable the generic public (asymetric) key writer.
   *
   * Module:  library/pkwrite.c
   * Caller:  library/x509write.c
   *
   * Requires: MBEDTLS_PK_C
   *
   * Uncomment to enable generic public key write functions.
   */
  #define MBEDTLS_PK_WRITE_C
  
  /**
   * \def MBEDTLS_PKCS5_C
   *
   * Enable PKCS#5 functions.
   *
   * Module:  library/pkcs5.c
   *
   * Requires: MBEDTLS_MD_C
   *
   * This module adds support for the PKCS#5 functions.
   */
  #define MBEDTLS_PKCS5_C
  
  /**
   * \def MBEDTLS_PKCS12_C
   *
   * Enable PKCS#12 PBE functions.
   * Adds algorithms for parsing PKCS#8 encrypted private keys
   *
   * Module:  library/pkcs12.c
   * Caller:  library/pkparse.c
   *
   * Requires: MBEDTLS_ASN1_PARSE_C, MBEDTLS_CIPHER_C, MBEDTLS_MD_C
   * Can use:  MBEDTLS_ARC4_C
   *
   * This module enables PKCS#12 functions.
   */
  #define MBEDTLS_PKCS12_C
  
  /**
   * \def MBEDTLS_PLATFORM_C
   *
   * Enable the platform abstraction layer that allows you to re-assign
   * functions like calloc(), free(), snprintf(), printf(), fprintf(), exit().
   *
   * Enabling MBEDTLS_PLATFORM_C enables to use of MBEDTLS_PLATFORM_XXX_ALT
   * or MBEDTLS_PLATFORM_XXX_MACRO directives, allowing the functions mentioned
   * above to be specified at runtime or compile time respectively.
   *
   * \note This abstraction layer must be enabled on Windows (including MSYS2)
   * as other module rely on it for a fixed snprintf implementation.
   *
   * Module:  library/platform.c
   * Caller:  Most other .c files
   *
   * This module enables abstraction of common (libc) functions.
   */
  #define MBEDTLS_PLATFORM_C
  
  /**
   * \def MBEDTLS_POLY1305_C
   *
   * Enable the Poly1305 MAC algorithm.
   *
   * Module:  library/poly1305.c
   * Caller:  library/chachapoly.c
   */
  #ifdef CONFIG_MBEDTLS_POLY1305_C
  #define MBEDTLS_POLY1305_C
  #else
  #undef MBEDTLS_POLY1305_C
  #endif
  
  /**
   * \def MBEDTLS_RIPEMD160_C
   *
   * Enable the RIPEMD-160 hash algorithm.
   *
   * Module:  library/mbedtls_ripemd160.c
   * Caller:  library/mbedtls_md.c
   *
   */
  #ifdef CONFIG_MBEDTLS_RIPEMD160_C
  #define MBEDTLS_RIPEMD160_C
  #else
  #undef MBEDTLS_RIPEMD160_C
  #endif
  
  /**
   * \def MBEDTLS_RSA_C
   *
   * Enable the RSA public-key cryptosystem.
   *
   * Module:  library/rsa.c
   * Caller:  library/ssl_cli.c
   *          library/ssl_srv.c
   *          library/ssl_tls.c
   *          library/x509.c
   *
   * This module is used by the following key exchanges:
   *      RSA, DHE-RSA, ECDHE-RSA, RSA-PSK
   *
   * Requires: MBEDTLS_BIGNUM_C, MBEDTLS_OID_C
   */
  #define MBEDTLS_RSA_C
  
  /**
   * \def MBEDTLS_SHA1_C
   *
   * Enable the SHA1 cryptographic hash algorithm.
   *
   * Module:  library/mbedtls_sha1.c
   * Caller:  library/mbedtls_md.c
   *          library/ssl_cli.c
   *          library/ssl_srv.c
   *          library/ssl_tls.c
   *          library/x509write_crt.c
   *
   * This module is required for SSL/TLS and SHA1-signed certificates.
   */
  #define MBEDTLS_SHA1_C
  
  /**
   * \def MBEDTLS_SHA256_C
   *
   * Enable the SHA-224 and SHA-256 cryptographic hash algorithms.
   *
   * Module:  library/mbedtls_sha256.c
   * Caller:  library/entropy.c
   *          library/mbedtls_md.c
   *          library/ssl_cli.c
   *          library/ssl_srv.c
   *          library/ssl_tls.c
   *
   * This module adds support for SHA-224 and SHA-256.
   * This module is required for the SSL/TLS 1.2 PRF function.
   */
  #define MBEDTLS_SHA256_C
  
  /**
   * \def MBEDTLS_SHA512_C
   *
   * Enable the SHA-384 and SHA-512 cryptographic hash algorithms.
   *
   * Module:  library/mbedtls_sha512.c
   * Caller:  library/entropy.c
   *          library/mbedtls_md.c
   *          library/ssl_cli.c
   *          library/ssl_srv.c
   *
   * This module adds support for SHA-384 and SHA-512.
   */
  #ifdef CONFIG_MBEDTLS_SHA512_C
  #define MBEDTLS_SHA512_C
  #else
  #undef MBEDTLS_SHA512_C
  #endif
  
  /**
   * \def MBEDTLS_SSL_CACHE_C
   *
   * Enable simple SSL cache implementation.
   *
   * Module:  library/ssl_cache.c
   * Caller:
   *
   * Requires: MBEDTLS_SSL_CACHE_C
   */
  #define MBEDTLS_SSL_CACHE_C
  
  /**
   * \def MBEDTLS_SSL_COOKIE_C
   *
   * Enable basic implementation of DTLS cookies for hello verification.
   *
   * Module:  library/ssl_cookie.c
   * Caller:
   */
  #define MBEDTLS_SSL_COOKIE_C
  
  /**
   * \def MBEDTLS_SSL_TICKET_C
   *
   * Enable an implementation of TLS server-side callbacks for session tickets.
   *
   * Module:  library/ssl_ticket.c
   * Caller:
   *
   * Requires: MBEDTLS_CIPHER_C
   */
  #ifdef CONFIG_MBEDTLS_SERVER_SSL_SESSION_TICKETS
  #define MBEDTLS_SSL_TICKET_C
  #else
  #undef MBEDTLS_SSL_TICKET_C
  #endif
  
  /**
   * \def MBEDTLS_SSL_CLI_C
   *
   * Enable the SSL/TLS client code.
   *
   * Module:  library/ssl_cli.c
   * Caller:
   *
   * Requires: MBEDTLS_SSL_TLS_C
   *
   * This module is required for SSL/TLS client support.
   */
  #ifdef CONFIG_MBEDTLS_TLS_CLIENT
  #define MBEDTLS_SSL_CLI_C
  #else
  #undef MBEDTLS_SSL_CLI_C
  #endif
  
  /**
   * \def MBEDTLS_SSL_SRV_C
   *
   * Enable the SSL/TLS server code.
   *
   * Module:  library/ssl_srv.c
   * Caller:
   *
   * Requires: MBEDTLS_SSL_TLS_C
   *
   * This module is required for SSL/TLS server support.
   */
  #ifdef CONFIG_MBEDTLS_TLS_SERVER
  #define MBEDTLS_SSL_SRV_C
  #else
  #undef MBEDTLS_SSL_SRV_C
  #endif
  
  /**
   * \def MBEDTLS_SSL_TLS_C
   *
   * Enable the generic SSL/TLS code.
   *
   * Module:  library/ssl_tls.c
   * Caller:  library/ssl_cli.c
   *          library/ssl_srv.c
   *
   * Requires: MBEDTLS_CIPHER_C, MBEDTLS_MD_C
   *           and at least one of the MBEDTLS_SSL_PROTO_XXX defines
   *
   * This module is required for SSL/TLS.
   */
  #ifdef CONFIG_MBEDTLS_TLS_ENABLED
  #define MBEDTLS_SSL_TLS_C
  #else
  #undef MBEDTLS_SSL_TLS_C
  #endif
  
  /**
   * \def MBEDTLS_TIMING_C
   *
   * Enable the semi-portable timing interface.
   *
   * \note The provided implementation only works on POSIX/Unix (including Linux,
   * BSD and OS X) and Windows. On other platforms, you can either disable that
   * module and provide your own implementations of the callbacks needed by
   * \c mbedtls_ssl_set_timer_cb() for DTLS, or leave it enabled and provide
   * your own implementation of the whole module by setting
   * \c MBEDTLS_TIMING_ALT in the current file.
   *
   * \note See also our Knowledge Base article about porting to a new
   * environment:
   * https://tls.mbed.org/kb/how-to/how-do-i-port-mbed-tls-to-a-new-environment-OS
   *
   * Module:  library/timing.c
   * Caller:  library/havege.c
   *
   * This module is used by the HAVEGE random number generator.
   */
  #ifdef MBEDTLS_TIMING_C
  #undef MBEDTLS_TIMING_C
  #endif
  
  /**
   * \def MBEDTLS_VERSION_C
   *
   * Enable run-time version information.
   *
   * Module:  library/version.c
   *
   * This module provides run-time version information.
   */
  #define MBEDTLS_VERSION_C
  
  /**
   * \def MBEDTLS_X509_USE_C
   *
   * Enable X.509 core for using certificates.
   *
   * Module:  library/x509.c
   * Caller:  library/mbedtls_x509_crl.c
   *          library/mbedtls_x509_crt.c
   *          library/mbedtls_x509_csr.c
   *
   * Requires: MBEDTLS_ASN1_PARSE_C, MBEDTLS_BIGNUM_C, MBEDTLS_OID_C,
   *           MBEDTLS_PK_PARSE_C
   *
   * This module is required for the X.509 parsing modules.
   */
  #define MBEDTLS_X509_USE_C
  
  /**
   * \def MBEDTLS_X509_CRT_PARSE_C
   *
   * Enable X.509 certificate parsing.
   *
   * Module:  library/mbedtls_x509_crt.c
   * Caller:  library/ssl_cli.c
   *          library/ssl_srv.c
   *          library/ssl_tls.c
   *
   * Requires: MBEDTLS_X509_USE_C
   *
   * This module is required for X.509 certificate parsing.
   */
  #define MBEDTLS_X509_CRT_PARSE_C
  
  /**
   * \def MBEDTLS_X509_CRL_PARSE_C
   *
   * Enable X.509 CRL parsing.
   *
   * Module:  library/mbedtls_x509_crl.c
   * Caller:  library/mbedtls_x509_crt.c
   *
   * Requires: MBEDTLS_X509_USE_C
   *
   * This module is required for X.509 CRL parsing.
   */
  #ifdef CONFIG_MBEDTLS_X509_CRL_PARSE_C
  #define MBEDTLS_X509_CRL_PARSE_C
  #else
  #undef MBEDTLS_X509_CRL_PARSE_C
  #endif
  
  /**
   * \def MBEDTLS_X509_CSR_PARSE_C
   *
   * Enable X.509 Certificate Signing Request (CSR) parsing.
   *
   * Module:  library/mbedtls_x509_csr.c
   * Caller:  library/x509_crt_write.c
   *
   * Requires: MBEDTLS_X509_USE_C
   *
   * This module is used for reading X.509 certificate request.
   */
  #ifdef CONFIG_MBEDTLS_X509_CSR_PARSE_C
  #define MBEDTLS_X509_CSR_PARSE_C
  #else
  #undef MBEDTLS_X509_CSR_PARSE_C
  #endif
  
  /**
   * \def MBEDTLS_X509_CREATE_C
   *
   * Enable X.509 core for creating certificates.
   *
   * Module:  library/x509_create.c
   *
   * Requires: MBEDTLS_BIGNUM_C, MBEDTLS_OID_C, MBEDTLS_PK_WRITE_C
   *
   * This module is the basis for creating X.509 certificates and CSRs.
   */
  #define MBEDTLS_X509_CREATE_C
  
  /**
   * \def MBEDTLS_X509_CRT_WRITE_C
   *
   * Enable creating X.509 certificates.
   *
   * Module:  library/x509_crt_write.c
   *
   * Requires: MBEDTLS_X509_CREATE_C
   *
   * This module is required for X.509 certificate creation.
   */
  #define MBEDTLS_X509_CRT_WRITE_C
  
  /**
   * \def MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
   *
    * Alow the X509 parser to not break-off when parsing an X509 certificate
   * and encountering an unknown critical extension.
   *
   * Module:  library/x509_crt.c
   *
   * Requires: MBEDTLS_X509_CRT_PARSE_C
   *
   * This module is supports loading of certificates with extensions that
   * may not be supported by mbedtls.
   */
  #ifdef CONFIG_MBEDTLS_ALLOW_UNSUPPORTED_CRITICAL_EXT
  #define MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
  #else
  #undef MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
  #endif
  
  /**
   * \def MBEDTLS_X509_CSR_WRITE_C
   *
   * Enable creating X.509 Certificate Signing Requests (CSR).
   *
   * Module:  library/x509_csr_write.c
   *
   * Requires: MBEDTLS_X509_CREATE_C
   *
   * This module is required for X.509 certificate request writing.
   */
  #define MBEDTLS_X509_CSR_WRITE_C
  
  /**
   * \def MBEDTLS_XTEA_C
   *
   * Enable the XTEA block cipher.
   *
   * Module:  library/xtea.c
   * Caller:
   */
  #ifdef CONFIG_MBEDTLS_XTEA_C
  #define MBEDTLS_XTEA_C
  #else
  #undef MBEDTLS_XTEA_C
  #endif
  
  /* \} name SECTION: mbed TLS modules */
  
  /**
   * \name SECTION: Module configuration options
   *
   * This section allows for the setting of module specific sizes and
   * configuration options. The default values are already present in the
   * relevant header files and should suffice for the regular use cases.
   *
   * Our advice is to enable options and change their values here
   * only if you have a good reason and know the consequences.
   *
   * Please check the respective header file for documentation on these
   * parameters (to prevent duplicate documentation).
   * \{
   */
  
  /* SSL options */
  #ifndef CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN
  
  #define MBEDTLS_SSL_MAX_CONTENT_LEN             CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN /**< Maxium fragment length in bytes, determines the size of each of the two internal I/O buffers */
  
  #else
  
  /** \def MBEDTLS_SSL_IN_CONTENT_LEN
   *
   * Maximum incoming fragment length in bytes.
   *
   * Uncomment to set the size of the inward TLS buffer independently of the
   * outward buffer.
   */
  #define MBEDTLS_SSL_IN_CONTENT_LEN              CONFIG_MBEDTLS_SSL_IN_CONTENT_LEN
  
  /** \def MBEDTLS_SSL_OUT_CONTENT_LEN
   *
   * Maximum outgoing fragment length in bytes.
   *
   * Uncomment to set the size of the outward TLS buffer independently of the
   * inward buffer.
   *
   * It is possible to save RAM by setting a smaller outward buffer, while keeping
   * the default inward 16384 byte buffer to conform to the TLS specification.
   *
   * The minimum required outward buffer size is determined by the handshake
   * protocol's usage. Handshaking will fail if the outward buffer is too small.
   * The specific size requirement depends on the configured ciphers and any
   * certificate data which is sent during the handshake.
   *
   * For absolute minimum RAM usage, it's best to enable
   * MBEDTLS_SSL_MAX_FRAGMENT_LENGTH and reduce MBEDTLS_SSL_MAX_CONTENT_LEN. This
   * reduces both incoming and outgoing buffer sizes. However this is only
   * guaranteed if the other end of the connection also supports the TLS
   * max_fragment_len extension. Otherwise the connection may fail.
   */
  #define MBEDTLS_SSL_OUT_CONTENT_LEN             CONFIG_MBEDTLS_SSL_OUT_CONTENT_LEN
  
  #endif /* !CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN */
  
  /**
   * Allow SHA-1 in the default TLS configuration for TLS 1.2 handshake
   * signature and ciphersuite selection. Without this build-time option, SHA-1
   * support must be activated explicitly through mbedtls_ssl_conf_sig_hashes.
   * The use of SHA-1 in TLS <= 1.1 and in HMAC-SHA-1 is always allowed by
   * default. At the time of writing, there is no practical attack on the use
   * of SHA-1 in handshake signatures, hence this option is turned on by default
   * for compatibility with existing peers.
   */
  #define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE
  
  /**
   * \def MBEDTLS_THREADING_C
   *
   * Enable the threading abstraction layer.
   * By default mbed TLS assumes it is used in a non-threaded environment or that
   * contexts are not shared between threads. If you do intend to use contexts
   * between threads, you will need to enable this layer to prevent race
   * conditions. See also our Knowledge Base article about threading:
   * https://tls.mbed.org/kb/development/thread-safety-and-multi-threading
   *
   * Module:  library/threading.c
   *
   * This allows different threading implementations (self-implemented or
   * provided).
   *
   * You will have to enable either MBEDTLS_THREADING_ALT or
   * MBEDTLS_THREADING_PTHREAD.
   *
   * Enable this layer to allow use of mutexes within mbed TLS
   */
  #ifdef CONFIG_MBEDTLS_THREADING_C
  #define MBEDTLS_THREADING_C
  #else
  #undef MBEDTLS_THREADING_C
  #endif
  
  /**
   * \def MBEDTLS_THREADING_ALT
   *
   * Provide your own alternate threading implementation.
   *
   * Requires: MBEDTLS_THREADING_C
   *
   * Uncomment this to allow your own alternate threading implementation.
   */
  #ifdef CONFIG_MBEDTLS_THREADING_ALT
  #define MBEDTLS_THREADING_ALT
  #else
  #undef MBEDTLS_THREADING_ALT
  #endif
  
  /**
   * \def MBEDTLS_THREADING_PTHREAD
   *
   * Enable the pthread wrapper layer for the threading layer.
   *
   * Requires: MBEDTLS_THREADING_C
   *
   * Uncomment this to enable pthread mutexes.
   */
  #ifdef CONFIG_MBEDTLS_THREADING_PTHREAD
  #define MBEDTLS_THREADING_PTHREAD
  #else
  #undef MBEDTLS_THREADING_PTHREAD
  #endif
  
  /* \} name SECTION: Module configuration options */
  
  #if defined(TARGET_LIKE_MBED)
  #include "mbedtls/target_config.h"
  #endif
  
  /*
   * Allow user to override any previous default.
   *
   * Use two macro names for that, as:
   * - with yotta the prefix YOTTA_CFG_ is forced
   * - without yotta is looks weird to have a YOTTA prefix.
   */
  #if defined(YOTTA_CFG_MBEDTLS_USER_CONFIG_FILE)
  #include YOTTA_CFG_MBEDTLS_USER_CONFIG_FILE
  #elif defined(MBEDTLS_USER_CONFIG_FILE)
  #include MBEDTLS_USER_CONFIG_FILE
  #endif
  
  #include "mbedtls/check_config.h"
  
  #endif /* MBEDTLS_CONFIG_H */
  