1/**
2 * \file config-ccm-psk-tls1_2.h
3 *
4 * \brief Minimal configuration for TLS 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 TLS 1.2 with PSK and AES-CCM ciphersuites
24 *
25 * Distinguishing features:
26 * - Optimized for small code size, low bandwidth (on a reliable 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 *
34 * See README.txt for usage instructions.
35 */
36
37/* System support */
38//#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */
39/* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */
40
41/* Mbed TLS modules */
42#define MBEDTLS_AES_C
43#define MBEDTLS_CCM_C
44#define MBEDTLS_CIPHER_C
45#define MBEDTLS_CTR_DRBG_C
46#define MBEDTLS_ENTROPY_C
47#define MBEDTLS_MD_C
48#define MBEDTLS_NET_C
49#define MBEDTLS_SHA256_C
50#define MBEDTLS_SSL_CLI_C
51#define MBEDTLS_SSL_SRV_C
52#define MBEDTLS_SSL_TLS_C
53
54/* TLS protocol feature support */
55#define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
56#define MBEDTLS_SSL_PROTO_TLS1_2
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_IN_CONTENT_LEN              1024
72#define MBEDTLS_SSL_OUT_CONTENT_LEN             1024
73
74/* Save RAM at the expense of ROM */
75#define MBEDTLS_AES_ROM_TABLES
76
77/* Save some RAM by adjusting to your exact needs */
78#define MBEDTLS_PSK_MAX_LEN    16 /* 128-bits keys are generally enough */
79
80/*
81 * You should adjust this to the exact number of sources you're using: default
82 * is the "platform_entropy_poll" source, but you may want to add other ones
83 * Minimum is 2 for the entropy test suite.
84 */
85#define MBEDTLS_ENTROPY_MAX_SOURCES 2
86
87/* These defines are present so that the config modifying scripts can enable
88 * them during tests/scripts/test-ref-configs.pl */
89//#define MBEDTLS_USE_PSA_CRYPTO
90//#define MBEDTLS_PSA_CRYPTO_C
91
92/* Error messages and TLS debugging traces
93 * (huge code size increase, needed for tests/ssl-opt.sh) */
94//#define MBEDTLS_DEBUG_C
95//#define MBEDTLS_ERROR_C
96