text: // ----------------------------------------------------------------------------
  // Copyright 2016-2019 ARM Ltd.
  //
  // 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 PAL_MBEDTLS_USER_CONFIG_H
  #define PAL_MBEDTLS_USER_CONFIG_H
  
  
  /*! All of the following definitions are mandatory requirements for correct 
  *   functionality of PAL TLS and Crypto components.
  *   Please do not disable them.
  */
  
  /* Platform has time function to provide time for certificates verifications */
  #if 1 //Please set to 1 if you are using secure time
  #ifndef MBEDTLS_HAVE_TIME
      #define MBEDTLS_HAVE_TIME
  #endif //MBEDTLS_HAVE_TIME
  
  #ifndef MBEDTLS_HAVE_TIME_DATE
      #define MBEDTLS_HAVE_TIME_DATE
  #endif //MBEDTLS_HAVE_TIME_DATE
  
  #ifndef MBEDTLS_PLATFORM_TIME_ALT
      #define MBEDTLS_PLATFORM_TIME_ALT
  #endif //MBEDTLS_PLATFORM_TIME_ALT
  
  /* System support */
  #ifndef MBEDTLS_HAVE_ASM
      #define MBEDTLS_HAVE_ASM
  #endif //MBEDTLS_HAVE_ASM
  #endif
  /* mbed TLS feature support */
  #ifndef MBEDTLS_ECP_DP_SECP256R1_ENABLED
      #define MBEDTLS_ECP_DP_SECP256R1_ENABLED
  #endif //MBEDTLS_ECP_DP_SECP256R1_ENABLED
  
  #ifndef MBEDTLS_ECP_NIST_OPTIM
      #define MBEDTLS_ECP_NIST_OPTIM
  #endif //MBEDTLS_ECP_NIST_OPTIM
  
  #ifndef MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
      #define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
  #endif //MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
  
  #ifndef MBEDTLS_SSL_PROTO_TLS1_2
      #define MBEDTLS_SSL_PROTO_TLS1_2
  #endif //MBEDTLS_SSL_PROTO_TLS1_2
  
  #ifndef MBEDTLS_SSL_PROTO_DTLS
      #define MBEDTLS_SSL_PROTO_DTLS
  #endif //MBEDTLS_SSL_PROTO_DTLS
  
  #ifndef MBEDTLS_SSL_DTLS_ANTI_REPLAY
      #define MBEDTLS_SSL_DTLS_ANTI_REPLAY
  #endif //MBEDTLS_SSL_DTLS_ANTI_REPLAY
  
  #ifndef MBEDTLS_SSL_DTLS_HELLO_VERIFY
      #define MBEDTLS_SSL_DTLS_HELLO_VERIFY
  #endif //MBEDTLS_SSL_DTLS_HELLO_VERIFY
  
  #ifndef MBEDTLS_SSL_EXPORT_KEYS
      #define MBEDTLS_SSL_EXPORT_KEYS
  #endif //MBEDTLS_SSL_EXPORT_KEYS
  
  /* mbed TLS modules */
  #ifndef MBEDTLS_AES_C
      #define MBEDTLS_AES_C
  #endif //MBEDTLS_AES_C
  
  /* Disable some of the speed optimizations on AES code to save
   * ~6200 bytes of ROM. According to comments on the mbedtls PR 394,
   * the speed on Cortex M4 is not even reduced by this. */
  #ifndef MBEDTLS_AES_FEWER_TABLES
      #define MBEDTLS_AES_FEWER_TABLES
  #endif // MBEDTLS_AES_FEWER_TABLES
  
  #ifndef MBEDTLS_ASN1_PARSE_C
      #define MBEDTLS_ASN1_PARSE_C
  #endif //MBEDTLS_ASN1_PARSE_C
  
  #ifndef MBEDTLS_ASN1_WRITE_C
      #define MBEDTLS_ASN1_WRITE_C
  #endif //MBEDTLS_ASN1_WRITE_C
  
  #ifndef MBEDTLS_BIGNUM_C
      #define MBEDTLS_BIGNUM_C
  #endif //MBEDTLS_BIGNUM_C
  
  #ifndef MBEDTLS_CIPHER_C
      #define MBEDTLS_CIPHER_C
  #endif //MBEDTLS_CIPHER_C
  
  #ifndef MBEDTLS_CTR_DRBG_C
      #define MBEDTLS_CTR_DRBG_C
  #endif //MBEDTLS_CTR_DRBG_C
  
  #ifndef MBEDTLS_ECP_C
      #define MBEDTLS_ECP_C
  #endif //MBEDTLS_ECP_C
  
  #ifndef MBEDTLS_ENTROPY_C
      #define MBEDTLS_ENTROPY_C
  #endif //MBEDTLS_ENTROPY_C
  
  #ifndef MBEDTLS_MD_C
      #define MBEDTLS_MD_C
  #endif //MBEDTLS_MD_C
  
  #ifndef MBEDTLS_OID_C
      #define MBEDTLS_OID_C
  #endif //MBEDTLS_OID_C
  
  #ifndef MBEDTLS_PK_C
      #define MBEDTLS_PK_C
  #endif //MBEDTLS_PK_C
  
  #ifndef MBEDTLS_PK_PARSE_C
      #define MBEDTLS_PK_PARSE_C
  #endif //MBEDTLS_PK_PARSE_C
  
  #ifndef MBEDTLS_SHA256_C
      #define MBEDTLS_SHA256_C
  #endif //MBEDTLS_SHA256_C
  
  // Disable the speed optimizations of SHA256, makes binary size smaller
  // on Cortex-M by 1800B with ARMCC5 and 1384B with GCC 6.3.
  #ifndef MBEDTLS_SHA256_SMALLER
      #define MBEDTLS_SHA256_SMALLER
  #endif // MBEDTLS_SHA256_SMALLER
  
  #ifndef MBEDTLS_SSL_COOKIE_C
      #define MBEDTLS_SSL_COOKIE_C
  #endif //MBEDTLS_SSL_COOKIE_C
  
  #ifndef MBEDTLS_SSL_CLI_C
      #define MBEDTLS_SSL_CLI_C
  #endif //MBEDTLS_SSL_CLI_C
  
  #ifndef MBEDTLS_SSL_TLS_C
      #define MBEDTLS_SSL_TLS_C
  #endif //MBEDTLS_SSL_TLS_C
  // XXX mbedclient needs these: mbedtls_x509_crt_free, mbedtls_x509_crt_init, mbedtls_x509_crt_parse
  #ifndef MBEDTLS_X509_USE_C
      #define MBEDTLS_X509_USE_C
  #endif //MBEDTLS_X509_USE_C
  
  #ifndef MBEDTLS_X509_CRT_PARSE_C
      #define MBEDTLS_X509_CRT_PARSE_C
  #endif //MBEDTLS_X509_CRT_PARSE_C
  // a bit wrong way to get mbedtls_ssl_conf_psk:
  #ifndef MBEDTLS_CMAC_C
      #define MBEDTLS_CMAC_C
  #endif //MBEDTLS_CMAC_C
  
  #ifndef MBEDTLS_ECDH_C
      #define MBEDTLS_ECDH_C
  #endif //MBEDTLS_ECDH_C
  
  #ifndef MBEDTLS_ECDSA_C
      #define MBEDTLS_ECDSA_C
  #endif //MBEDTLS_ECDSA_C
  
  #ifndef MBEDTLS_GCM_C
      #define MBEDTLS_GCM_C
  #endif //MBEDTLS_GCM_C
  
  #ifndef MBEDTLS_X509_CRT_PARSE_C
      #define MBEDTLS_X509_CRT_PARSE_C
  #endif //MBEDTLS_X509_CRT_PARSE_C
  
  #ifndef MBEDTLS_X509_CSR_PARSE_C
      #define MBEDTLS_X509_CSR_PARSE_C
  #endif //MBEDTLS_X509_CSR_PARSE_C
  
  #ifndef MBEDTLS_X509_CREATE_C
      #define MBEDTLS_X509_CREATE_C
  #endif //MBEDTLS_X509_CREATE_C
  
  #ifndef MBEDTLS_X509_CSR_WRITE_C
      #define MBEDTLS_X509_CSR_WRITE_C
  #endif //MBEDTLS_X509_CSR_WRITE_C
  
  #ifndef MBEDTLS_CTR_DRBG_MAX_REQUEST
      #define MBEDTLS_CTR_DRBG_MAX_REQUEST 2048
  #endif //MBEDTLS_CTR_DRBG_MAX_REQUEST
  
  // Needed by update
  #ifndef MBEDTLS_CIPHER_MODE_CTR
      #define MBEDTLS_CIPHER_MODE_CTR
  #endif //MBEDTLS_CIPHER_MODE_CTR
  
  // Save ROM and a few bytes of RAM by specifying our own ciphersuite list
  #ifndef MBEDTLS_SSL_CIPHERSUITES
      #define MBEDTLS_SSL_CIPHERSUITES MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8, \
                                       MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, \
                                       MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, \
                                       MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8, \
                                       MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8
  #endif //MBEDTLS_SSL_CIPHERSUITES
  
  /*! All of the following definitions are optimizations (reduce mbedTLS memory usage and size),
  *   changing them is on the user responsibility since they can enlarge
  *   the binary footprint and the memory usage
  */
  
  // define to save 8KB RAM at the expense of ROM
  #ifndef MBEDTLS_AES_ROM_TABLES
      #define MBEDTLS_AES_ROM_TABLES
  #endif //MBEDTLS_AES_ROM_TABLES
  
  // Reduce IO buffer to save RAM, default is 16KB
  #ifndef MBEDTLS_SSL_MAX_CONTENT_LEN
      #define MBEDTLS_SSL_MAX_CONTENT_LEN 4096
  #endif //MBEDTLS_SSL_MAX_CONTENT_LEN
  
  // needed for Base64 encoding Opaque data for
  // registration payload, adds 500 bytes to flash.
  #ifndef MBEDTLS_BASE64_C
      #define MBEDTLS_BASE64_C
  #endif // MBEDTLS_BASE64_C
  
  /**
   * \def MBEDTLS_SSL_RENEGOTIATION
   *
   * Enable 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.
   *
   * \note   Even if this option is disabled, both client and server are aware
   *         of the Renegotiation Indication Extension (RFC 5746) used to
   *         prevent the SSL renegotiation attack (see RFC 5746 Sect. 1).
   *         (See \c mbedtls_ssl_conf_legacy_renegotiation for the
   *          configuration of this extension).
   *
   * \note   This feature is required by Device Management Client for Client-side
   *         certificate expiration verification. Disabling it will also require
   *         setting PAL_USE_SECURE_TIME to 0.
   *
   */
  #define MBEDTLS_SSL_RENEGOTIATION
  
  // Needed by provisioning
  #undef MBEDTLS_PEM_WRITE_C
  
  // Remove RSA, save 20KB at total
  #if !MBED_CONF_MBED_CLIENT_PAL_RSA_REQUIRED
      #undef MBEDTLS_RSA_C
      #undef MBEDTLS_PK_RSA_ALT_SUPPORT
      #undef MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
      #undef MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
      #undef MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
  #endif // MBED_CONF_MBED_CLIENT_PAL_RSA_REQUIRED
  
  // Remove error messages, save 10KB of ROM
  #undef MBEDTLS_ERROR_C
  
  // Remove selftesting and save 11KB of ROM
  #undef MBEDTLS_SELF_TEST
  
  #undef MBEDTLS_CERTS_C
  
  // Reduces ROM size by 30 kB
  #undef MBEDTLS_ERROR_STRERROR_DUMMY
  
  #undef MBEDTLS_VERSION_FEATURES
  
  #undef MBEDTLS_DEBUG_C
  
  // needed for parsing the certificates
  #undef MBEDTLS_PEM_PARSE_C
  
  #undef MBEDTLS_SHA512_C
  
  #undef MBEDTLS_SSL_SRV_C
  
  #undef MBEDTLS_ECP_DP_SECP192R1_ENABLED
  #undef MBEDTLS_ECP_DP_SECP224R1_ENABLED
  #undef MBEDTLS_ECP_DP_SECP384R1_ENABLED
  #undef MBEDTLS_ECP_DP_SECP521R1_ENABLED
  #undef MBEDTLS_ECP_DP_SECP192K1_ENABLED
  #undef MBEDTLS_ECP_DP_SECP224K1_ENABLED
  #undef MBEDTLS_ECP_DP_SECP256K1_ENABLED
  #undef MBEDTLS_ECP_DP_BP256R1_ENABLED
  #undef MBEDTLS_ECP_DP_BP384R1_ENABLED
  #undef MBEDTLS_ECP_DP_BP512R1_ENABLED
  #undef MBEDTLS_ECP_DP_CURVE25519_ENABLED
  
  // Reduces size particularly in case PSA crypto is used
  #undef MBEDTLS_CHACHA20_C
  #undef MBEDTLS_CHACHAPOLY_C
  #undef MBEDTLS_POLY1305_C
  
  #include "mbedtls/check_config.h"
  
  #endif /* PAL_MBEDTLS_USER_CONFIG_H */
  