| 1 | /*
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| 2 | * Minimal configuration for TLS 1.2 with PSK and AES-CCM ciphersuites
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 | /*
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| 22 | * Minimal configuration for TLS 1.2 with PSK and AES-CCM ciphersuites
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| 23 | * Distinguishing features:
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| 24 | * - no bignum, no PK, no X509
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| 25 | * - fully modern and secure (provided the pre-shared keys have high entropy)
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| 26 | * - very low record overhead with CCM-8
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| 27 | * - optimized for low RAM usage
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| 28 | *
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| 29 | * See README.txt for usage instructions.
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| 30 | */
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| 31 | #ifndef MBEDTLS_CONFIG_H
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| 32 | #define MBEDTLS_CONFIG_H
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| 33 |
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| 34 | /* System support */
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| 35 | //#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */
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| 36 | /* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */
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| 37 |
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| 38 | /* mbed TLS feature support */
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| 39 | #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
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| 40 | #define MBEDTLS_SSL_PROTO_TLS1_2
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| 41 |
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| 42 | /* mbed TLS modules */
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| 43 | #define MBEDTLS_AES_C
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| 44 | #define MBEDTLS_CCM_C
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| 45 | #define MBEDTLS_CIPHER_C
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| 46 | #define MBEDTLS_CTR_DRBG_C
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| 47 | #define MBEDTLS_ENTROPY_C
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| 48 | #define MBEDTLS_MD_C
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| 49 | #define MBEDTLS_NET_C
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| 50 | #define MBEDTLS_SHA256_C
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| 51 | #define MBEDTLS_SSL_CLI_C
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| 52 | #define MBEDTLS_SSL_SRV_C
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| 53 | #define MBEDTLS_SSL_TLS_C
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| 54 |
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| 55 | /* Save RAM at the expense of ROM */
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| 56 | #define MBEDTLS_AES_ROM_TABLES
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| 57 |
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| 58 | /* Save some RAM by adjusting to your exact needs */
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| 59 | #define MBEDTLS_PSK_MAX_LEN 16 /* 128-bits keys are generally enough */
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| 60 |
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| 61 | /*
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| 62 | * You should adjust this to the exact number of sources you're using: default
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| 63 | * is the "platform_entropy_poll" source, but you may want to add other ones
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| 64 | * Minimum is 2 for the entropy test suite.
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| 65 | */
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| 66 | #define MBEDTLS_ENTROPY_MAX_SOURCES 2
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| 67 |
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| 68 | /*
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| 69 | * Use only CCM_8 ciphersuites, and
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| 70 | * save ROM and a few bytes of RAM by specifying our own ciphersuite list
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| 71 | */
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| 72 | #define MBEDTLS_SSL_CIPHERSUITES \
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| 73 | MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8, \
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| 74 | MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8
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| 75 |
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| 76 | /*
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| 77 | * Save RAM at the expense of interoperability: do this only if you control
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| 78 | * both ends of the connection! (See comments in "mbedtls/ssl.h".)
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| 79 | * The optimal size here depends on the typical size of records.
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| 80 | */
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| 81 | #define MBEDTLS_SSL_MAX_CONTENT_LEN 512
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| 82 |
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| 83 | #include "mbedtls/check_config.h"
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| 84 |
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| 85 | #endif /* MBEDTLS_CONFIG_H */
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