New sample/test configuration: small DTLS 1.2
1. Copy config-ccm-psk-tls1_2.h 2. Add DTLS support 3. Add some TLS and DTLS features that are useful in low-bandwidth, low-reliability networks 4. Reduce the SSL buffer to a very small size Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine
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configs/config-ccm-psk-dtls1_2.h
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configs/config-ccm-psk-dtls1_2.h
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/**
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* \file config-ccm-psk-dtls1_2.h
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*
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* \brief Small configuration for DTLS 1.2 with PSK and AES-CCM ciphersuites
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Minimal configuration for DTLS 1.2 with PSK and AES-CCM ciphersuites
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*
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* Distinguishing features:
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* - Optimized for small code size, low bandwidth (on an unreliable network),
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* and low RAM usage.
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* - No asymmetric cryptography (no certificates, no Diffie-Hellman key
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* exchange).
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* - Fully modern and secure (provided the pre-shared keys are generated and
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* stored securely).
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* - Very low record overhead with CCM-8.
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* - Includes several optional DTLS features typically used in IoT.
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*
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* See README.txt for usage instructions.
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*/
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/* System support */
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//#define MBEDTLS_HAVE_TIME /* Optionally used in Hello messages */
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/* Other MBEDTLS_HAVE_XXX flags irrelevant for this configuration */
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/* Mbed TLS modules */
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#define MBEDTLS_AES_C
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#define MBEDTLS_CCM_C
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#define MBEDTLS_CIPHER_C
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#define MBEDTLS_CTR_DRBG_C
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#define MBEDTLS_ENTROPY_C
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#define MBEDTLS_MD_C
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#define MBEDTLS_NET_C
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/* The library does not currently support enabling SHA-224 without SHA-256.
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* A future version of the library will have this option disabled
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* by default. */
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#define MBEDTLS_SHA224_C
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#define MBEDTLS_SHA256_C
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#define MBEDTLS_SSL_CLI_C
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#define MBEDTLS_SSL_COOKIE_C
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#define MBEDTLS_SSL_SRV_C
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#define MBEDTLS_SSL_TLS_C
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#define MBEDTLS_TIMING_C
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/* TLS protocol feature support */
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#define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
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#define MBEDTLS_SSL_PROTO_TLS1_2
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#define MBEDTLS_SSL_PROTO_DTLS
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#define MBEDTLS_SSL_DTLS_ANTI_REPLAY
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#define MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE
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#define MBEDTLS_SSL_DTLS_CONNECTION_ID
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#define MBEDTLS_SSL_DTLS_HELLO_VERIFY
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#define MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
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/*
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* Use only CCM_8 ciphersuites, and
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* save ROM and a few bytes of RAM by specifying our own ciphersuite list
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*/
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#define MBEDTLS_SSL_CIPHERSUITES \
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MBEDTLS_TLS_PSK_WITH_AES_256_CCM_8, \
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MBEDTLS_TLS_PSK_WITH_AES_128_CCM_8
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/*
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* Save RAM at the expense of interoperability: do this only if you control
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* both ends of the connection! (See comments in "mbedtls/ssl.h".)
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* The optimal size here depends on the typical size of records.
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*/
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#define MBEDTLS_SSL_IN_CONTENT_LEN 256
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#define MBEDTLS_SSL_OUT_CONTENT_LEN 256
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/* Save RAM at the expense of ROM */
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#define MBEDTLS_AES_ROM_TABLES
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/* Save some RAM by adjusting to your exact needs */
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#define MBEDTLS_PSK_MAX_LEN 16 /* 128-bits keys are generally enough */
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/*
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* You should adjust this to the exact number of sources you're using: default
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* is the "platform_entropy_poll" source, but you may want to add other ones
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* Minimum is 2 for the entropy test suite.
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*/
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#define MBEDTLS_ENTROPY_MAX_SOURCES 2
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/* These defines are present so that the config modifying scripts can enable
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* them during tests/scripts/test-ref-configs.pl */
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//#define MBEDTLS_USE_PSA_CRYPTO
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//#define MBEDTLS_PSA_CRYPTO_C
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@ -32,6 +32,10 @@ my %configs = (
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'compat' => '-m tls12 -f \'^TLS-PSK-WITH-AES-...-CCM-8\'',
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'compat' => '-m tls12 -f \'^TLS-PSK-WITH-AES-...-CCM-8\'',
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'test_again_with_use_psa' => 1
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'test_again_with_use_psa' => 1
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},
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},
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'config-ccm-psk-dtls1_2.h' => {
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'compat' => '-m dtls12 -f \'^TLS-PSK-WITH-AES-...-CCM-8\'',
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'test_again_with_use_psa' => 1
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},
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'config-no-entropy.h' => {
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'config-no-entropy.h' => {
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},
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},
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'config-suite-b.h' => {
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'config-suite-b.h' => {
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