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 9 * 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may 11 * not use this file except in compliance with the License. 12 * You may obtain a copy of the License at 13 * 14 * http://www.apache.org/licenses/LICENSE-2.0 15 * 16 * Unless required by applicable law or agreed to in writing, software 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 19 * See the License for the specific language governing permissions and 20 * limitations under the License. 21 */ 22 /* 23 * Minimal configuration for DTLS 1.2 with PSK and AES-CCM ciphersuites 24 * 25 * Distinguishing features: 26 * - Optimized for small code size, low bandwidth (on an unreliable transport), 27 * and low RAM usage. 28 * - No asymmetric cryptography (no certificates, no Diffie-Hellman key 29 * exchange). 30 * - Fully modern and secure (provided the pre-shared keys are generated and 31 * stored securely). 32 * - Very low record overhead with CCM-8. 33 * - Includes several optional DTLS features typically used in IoT. 34 * 35 * See README.txt for usage instructions. 36 */ 37 38 /* System support */ 39 //#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */ 40 /* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */ 41 42 /* Mbed TLS modules */ 43 #define MBEDTLS_AES_C 44 #define MBEDTLS_CCM_C 45 #define MBEDTLS_CIPHER_C 46 #define MBEDTLS_CTR_DRBG_C 47 #define MBEDTLS_ENTROPY_C 48 #define MBEDTLS_MD_C 49 #define MBEDTLS_NET_C 50 /* The library does not currently support enabling SHA-224 without SHA-256. 51 * A future version of the library will have this option disabled 52 * by default. */ 53 #define MBEDTLS_SHA224_C 54 #define MBEDTLS_SHA256_C 55 #define MBEDTLS_SSL_CLI_C 56 #define MBEDTLS_SSL_COOKIE_C 57 #define MBEDTLS_SSL_SRV_C 58 #define MBEDTLS_SSL_TLS_C 59 #define MBEDTLS_TIMING_C 60 61 /* TLS protocol feature support */ 62 #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED 63 #define MBEDTLS_SSL_PROTO_TLS1_2 64 #define MBEDTLS_SSL_PROTO_DTLS 65 #define MBEDTLS_SSL_DTLS_ANTI_REPLAY 66 #define MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE 67 #define MBEDTLS_SSL_DTLS_CONNECTION_ID 68 #define MBEDTLS_SSL_DTLS_HELLO_VERIFY 69 #define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH 70 71 /* 72 * Use only CCM_8 ciphersuites, and 73 * save ROM and a few bytes of RAM by specifying our own ciphersuite list 74 */ 75 #define MBEDTLS_SSL_CIPHERSUITES \ 76 MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8, \ 77 MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8 78 79 /* 80 * Save RAM at the expense of interoperability: do this only if you control 81 * both ends of the connection! (See comments in "mbedtls/ssl.h".) 82 * The optimal size here depends on the typical size of records. 83 */ 84 #define MBEDTLS_SSL_IN_CONTENT_LEN 256 85 #define MBEDTLS_SSL_OUT_CONTENT_LEN 256 86 87 /* Save RAM at the expense of ROM */ 88 #define MBEDTLS_AES_ROM_TABLES 89 90 /* Save some RAM by adjusting to your exact needs */ 91 #define MBEDTLS_PSK_MAX_LEN 16 /* 128-bits keys are generally enough */ 92 93 /* 94 * You should adjust this to the exact number of sources you're using: default 95 * is the "platform_entropy_poll" source, but you may want to add other ones 96 * Minimum is 2 for the entropy test suite. 97 */ 98 #define MBEDTLS_ENTROPY_MAX_SOURCES 2 99 100 /* These defines are present so that the config modifying scripts can enable 101 * them during tests/scripts/test-ref-configs.pl */ 102 //#define MBEDTLS_USE_PSA_CRYPTO 103 //#define MBEDTLS_PSA_CRYPTO_C 104 105 /* Error messages and TLS debugging traces 106 * (huge code size increase, needed for tests/ssl-opt.sh) */ 107 //#define MBEDTLS_DEBUG_C 108 //#define MBEDTLS_ERROR_C 109
