/*
 *  Minimal configuration for TLS 1.2 with PSK and AES-CCM ciphersuites
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
/*
 * 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
#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_MAX_CONTENT_LEN             512

#include "check_config.h"

#endif /* MBEDTLS_CONFIG_H */