1 /** 2 * \file config-ccm-psk-dtls1_2.h 3 * 4 * \brief Small configuration for DTLS 1.2 with PSK and AES-CCM ciphersuites 5 */ 6 /* 7 * Copyright The Mbed TLS Contributors 8 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later 9 */ 10 /* 11 * Minimal configuration for DTLS 1.2 with PSK and AES-CCM ciphersuites 12 * 13 * Distinguishing features: 14 * - Optimized for small code size, low bandwidth (on an unreliable transport), 15 * and low RAM usage. 16 * - No asymmetric cryptography (no certificates, no Diffie-Hellman key 17 * exchange). 18 * - Fully modern and secure (provided the pre-shared keys are generated and 19 * stored securely). 20 * - Very low record overhead with CCM-8. 21 * - Includes several optional DTLS features typically used in IoT. 22 * 23 * See README.txt for usage instructions. 24 */ 25 #ifndef MBEDTLS_CONFIG_H 26 #define MBEDTLS_CONFIG_H 27 28 /* System support */ 29 //#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */ 30 /* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */ 31 32 /* Mbed TLS modules */ 33 #define MBEDTLS_AES_C 34 #define MBEDTLS_CCM_C 35 #define MBEDTLS_CIPHER_C 36 #define MBEDTLS_CTR_DRBG_C 37 #define MBEDTLS_ENTROPY_C 38 #define MBEDTLS_MD_C 39 #define MBEDTLS_NET_C 40 #define MBEDTLS_SHA256_C 41 #define MBEDTLS_SSL_CLI_C 42 #define MBEDTLS_SSL_COOKIE_C 43 #define MBEDTLS_SSL_SRV_C 44 #define MBEDTLS_SSL_TLS_C 45 #define MBEDTLS_TIMING_C 46 47 /* TLS protocol feature support */ 48 #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED 49 #define MBEDTLS_SSL_PROTO_TLS1_2 50 #define MBEDTLS_SSL_PROTO_DTLS 51 #define MBEDTLS_SSL_DTLS_ANTI_REPLAY 52 #define MBEDTLS_SSL_DTLS_BADMAC_LIMIT 53 #define MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE 54 #define MBEDTLS_SSL_DTLS_CONNECTION_ID 55 #define MBEDTLS_SSL_DTLS_HELLO_VERIFY 56 #define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH 57 58 /* 59 * Use only CCM_8 ciphersuites, and 60 * save ROM and a few bytes of RAM by specifying our own ciphersuite list 61 */ 62 #define MBEDTLS_SSL_CIPHERSUITES \ 63 MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8, \ 64 MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8 65 66 /* 67 * Save RAM at the expense of interoperability: do this only if you control 68 * both ends of the connection! (See comments in "mbedtls/ssl.h".) 69 * The optimal size here depends on the typical size of records. 70 */ 71 #define MBEDTLS_SSL_MAX_CONTENT_LEN 256 72 73 /* Save RAM at the expense of ROM */ 74 #define MBEDTLS_AES_ROM_TABLES 75 76 /* Save some RAM by adjusting to your exact needs */ 77 #define MBEDTLS_PSK_MAX_LEN 16 /* 128-bits keys are generally enough */ 78 79 /* 80 * You should adjust this to the exact number of sources you're using: default 81 * is the "platform_entropy_poll" source plus a weak clock source, but you may 82 * want to add other ones. Minimum is 3 for the entropy test suite. 83 */ 84 #define MBEDTLS_ENTROPY_MAX_SOURCES 3 85 86 /* These defines are present so that the config modifying scripts can enable 87 * them during tests/scripts/test-ref-configs.pl */ 88 //#define MBEDTLS_USE_PSA_CRYPTO 89 //#define MBEDTLS_PSA_CRYPTO_C 90 91 /* Error messages and TLS debugging traces 92 * (huge code size increase, needed for tests/ssl-opt.sh) */ 93 //#define MBEDTLS_DEBUG_C 94 //#define MBEDTLS_ERROR_C 95 96 #include "mbedtls/check_config.h" 97 98 #endif /* MBEDTLS_CONFIG_H */ 99