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 26 /* System support */ 27 //#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */ 28 /* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */ 29 30 /* Mbed TLS modules */ 31 #define MBEDTLS_AES_C 32 #define MBEDTLS_CCM_C 33 #define MBEDTLS_CIPHER_C 34 #define MBEDTLS_CTR_DRBG_C 35 #define MBEDTLS_ENTROPY_C 36 #define MBEDTLS_MD_C 37 #define MBEDTLS_NET_C 38 #define MBEDTLS_SHA256_C 39 #define MBEDTLS_SSL_CLI_C 40 #define MBEDTLS_SSL_COOKIE_C 41 #define MBEDTLS_SSL_SRV_C 42 #define MBEDTLS_SSL_TLS_C 43 #define MBEDTLS_TIMING_C 44 45 /* TLS protocol feature support */ 46 #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED 47 #define MBEDTLS_SSL_PROTO_TLS1_2 48 #define MBEDTLS_SSL_PROTO_DTLS 49 #define MBEDTLS_SSL_DTLS_ANTI_REPLAY 50 #define MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE 51 #define MBEDTLS_SSL_DTLS_CONNECTION_ID 52 #define MBEDTLS_SSL_DTLS_HELLO_VERIFY 53 #define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH 54 55 /* 56 * Use only CCM_8 ciphersuites, and 57 * save ROM and a few bytes of RAM by specifying our own ciphersuite list 58 */ 59 #define MBEDTLS_SSL_CIPHERSUITES \ 60 MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8, \ 61 MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8 62 63 /* 64 * Save RAM at the expense of interoperability: do this only if you control 65 * both ends of the connection! (See comments in "mbedtls/ssl.h".) 66 * The optimal size here depends on the typical size of records. 67 */ 68 #define MBEDTLS_SSL_IN_CONTENT_LEN 256 69 #define MBEDTLS_SSL_OUT_CONTENT_LEN 256 70 71 /* Save RAM at the expense of ROM */ 72 #define MBEDTLS_AES_ROM_TABLES 73 74 /* Save some RAM by adjusting to your exact needs */ 75 #define MBEDTLS_PSK_MAX_LEN 16 /* 128-bits keys are generally enough */ 76 77 /* 78 * You should adjust this to the exact number of sources you're using: default 79 * is the "platform_entropy_poll" source, but you may want to add other ones 80 * Minimum is 2 for the entropy test suite. 81 */ 82 #define MBEDTLS_ENTROPY_MAX_SOURCES 2 83 84 /* These defines are present so that the config modifying scripts can enable 85 * them during tests/scripts/test-ref-configs.pl */ 86 //#define MBEDTLS_USE_PSA_CRYPTO 87 //#define MBEDTLS_PSA_CRYPTO_C 88 89 /* Error messages and TLS debugging traces 90 * (huge code size increase, needed for tests/ssl-opt.sh) */ 91 //#define MBEDTLS_DEBUG_C 92 //#define MBEDTLS_ERROR_C 93
