mbedtls/configs/config-suite-b.h

/**
 * \file config-suite-b.h
 *
 * \brief Minimal configuration for TLS NSA Suite B Profile (RFC 6460)
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
/*
 * Minimal configuration for TLS NSA Suite B Profile (RFC 6460)
 *
 * Distinguishing features:
 * - no RSA or classic DH, fully based on ECC
 * - optimized for low RAM usage
 *
 * Possible improvements:
 * - if 128-bit security is enough, disable secp384r1 and SHA-512
 * - use embedded certs in DER format and disable PEM_PARSE_C and BASE64_C
 *
 * See README.txt for usage instructions.
 */

/* Mbed TLS feature support */
#define MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
#define MBEDTLS_SSL_PROTO_TLS1_2

/* Mbed TLS modules */
#define MBEDTLS_NET_C
#define MBEDTLS_SSL_CLI_C
#define MBEDTLS_SSL_SRV_C
#define MBEDTLS_SSL_TLS_C
#define MBEDTLS_X509_CRT_PARSE_C
#define MBEDTLS_X509_USE_C

/* Save ROM and a few bytes of RAM by specifying our own ciphersuite list */
#define MBEDTLS_SSL_CIPHERSUITES                        \
    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,    \
    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

/*
 * Save RAM at the expense of interoperability: do this only if you control
 * both ends of the connection!  (See comments in "mbedtls/ssl.h".)
 * The minimum size here depends on the certificate chain used as well as the
 * typical size of records.
 */
#define MBEDTLS_SSL_IN_CONTENT_LEN             1024
#define MBEDTLS_SSL_OUT_CONTENT_LEN             1024

/* Error messages and TLS debugging traces
 * (huge code size increase, needed for tests/ssl-opt.sh) */
//#define MBEDTLS_DEBUG_C
//#define MBEDTLS_ERROR_C