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https://github.com/Mbed-TLS/mbedtls.git
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86eac795c9
Nowadays, the timing module just builds on a function that provides a timer with millisecond resolution. In terms of platform requirements, this is almost exactly equivalent to `mbedtls_ms_time()` provides (`mbedtls_ms_time()` is arguably a little stronger because it is supposed to last longer than a single timer object, but an application could start a timer when it starts, so there's no real difference.) So it's a bit silly that `timing.c` essentially reimplements this. Rely on `mbedtls_ms_time()` instead. This is an API break because in Mbed TLS 4.0, it was possible to enable `MBEDTLS_TIMING_C` without `MBEDTLS_HAVE_TIME`. However, `timing.c` only provided an implementation for Windows and Unix-like platforms, and on those platforms, it is very likely that the default implementation of `MBEDTLS_HAVE_TIME` would also work. (The main exception would be a platform that has the traditional Unix function `gettimeofday()`, but not the 1990s novelty `clock_gettime()`.) So make this an official requirement, as a belated change that really should have gone into 4.0 if we'd taken the time to dig into it. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/**
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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 OR GPL-2.0-or-later
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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 transport),
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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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/* Mbed TLS modules */
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#define MBEDTLS_NET_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 //Only used by test programs
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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 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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/* Error messages and TLS debugging traces
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* (huge code size increase, needed for tests/ssl-opt.sh) */
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//#define MBEDTLS_DEBUG_C
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//#define MBEDTLS_ERROR_C
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