text: /**
   * \file config-ccm-psk-tls1_2.h
   *
   * \brief Minimal configuration for TLS 1.2 with PSK and AES-CCM ciphersuites
   */
  /*
   *  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.
   */
  /*
   * Minimal configuration for TLS 1.2 with PSK and AES-CCM ciphersuites
   * Distinguishing features:
   * - no bignum, no PK, no X509
   * - fully modern and secure (provided the pre-shared keys have high entropy)
   * - very low record overhead with CCM-8
   * - optimized for low RAM usage
   *
   * See README.txt for usage instructions.
   */
  #ifndef MBEDTLS_CONFIG_H
  #define MBEDTLS_CONFIG_H
  
  /* System support */
  //#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */
  /* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */
  
  /* mbed TLS feature support */
  #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
  #define MBEDTLS_SSL_PROTO_TLS1_2
  
  /* mbed TLS modules */
  #define MBEDTLS_AES_C
  #define MBEDTLS_CCM_C
  #define MBEDTLS_CIPHER_C
  #define MBEDTLS_CTR_DRBG_C
  #define MBEDTLS_ENTROPY_C
  #define MBEDTLS_MD_C
  #define MBEDTLS_NET_C
  /* The library does not currently support enabling SHA-224 without SHA-256.
   * A future version of the library will have this option disabled
   * by default. */
  #define MBEDTLS_SHA224_C
  #define MBEDTLS_SHA256_C
  #define MBEDTLS_SSL_CLI_C
  #define MBEDTLS_SSL_SRV_C
  #define MBEDTLS_SSL_TLS_C
  
  /* Save RAM at the expense of ROM */
  #define MBEDTLS_AES_ROM_TABLES
  
  /* Save some RAM by adjusting to your exact needs */
  #define MBEDTLS_PSK_MAX_LEN    16 /* 128-bits keys are generally enough */
  
  /*
   * You should adjust this to the exact number of sources you're using: default
   * is the "platform_entropy_poll" source, but you may want to add other ones
   * Minimum is 2 for the entropy test suite.
   */
  #define MBEDTLS_ENTROPY_MAX_SOURCES 2
  
  /*
   * Use only CCM_8 ciphersuites, and
   * save ROM and a few bytes of RAM by specifying our own ciphersuite list
   */
  #define MBEDTLS_SSL_CIPHERSUITES                        \
          MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8,             \
          MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8
  
  /*
   * Save RAM at the expense of interoperability: do this only if you control
   * both ends of the connection!  (See comments in "mbedtls/ssl.h".)
   * The optimal size here depends on the typical size of records.
   */
  #define MBEDTLS_SSL_IN_CONTENT_LEN             1024
  #define MBEDTLS_SSL_OUT_CONTENT_LEN             1024
  
  #include "mbedtls/check_config.h"
  
  #endif /* MBEDTLS_CONFIG_H */
  