text: /*
   *  Minimal configuration for using TLS in the bootloader
   *
   *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   *  Copyright (C) 2016, Linaro Ltd
   *  SPDX-License-Identifier: Apache-2.0
   *
   *  Licensed under the Apache License, Version 2.0 (the "License"); you may
   *  not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   *
   *  This file is part of mbed TLS (https://tls.mbed.org)
   */
  
  /*
   * Minimal configuration for using TLS in the bootloader
   *
   * - RSA or ECDSA signature verification
   */
  
  #ifndef MBEDTLS_CONFIG_BOOT_H
  #define MBEDTLS_CONFIG_BOOT_H
  
  /* TODO: Configure this between app and target.  Really, we want the
   * config to come from the app. */
  #define CONFIG_BOOT_VERIFY_RSA_SIGNATURE
  
  /* System support */
  #define MBEDTLS_PLATFORM_C
  #define MBEDTLS_PLATFORM_MEMORY
  #define MBEDTLS_MEMORY_BUFFER_ALLOC_C
  #define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
  #define MBEDTLS_PLATFORM_EXIT_ALT
  #define MBEDTLS_NO_PLATFORM_ENTROPY
  #define MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
  #define MBEDTLS_PLATFORM_PRINTF_ALT
  
  #if !defined(CONFIG_ARM)
  #define MBEDTLS_HAVE_ASM
  #endif
  
  #if defined(CONFIG_MBEDTLS_TEST)
  #define MBEDTLS_SELF_TEST
  #define MBEDTLS_DEBUG_C
  #else
  #define MBEDTLS_ENTROPY_C
  #define MBEDTLS_TEST_NULL_ENTROPY
  #endif
  
  /* mbed TLS feature support */
  #ifdef CONFIG_BOOT_VERIFY_ECDSA_SIGNATURE
  #define MBEDTLS_ECP_DP_SECP256R1_ENABLED
  #define MBEDTLS_ECP_DP_SECP224R1_ENABLED
  #define MBEDTLS_ECP_NIST_OPTIM
  #define MBEDTLS_ECDSA_C
  #define MBEDTLS_ECDH_C
  #define MBEDTLS_ECP_C
  #endif
  
  #ifdef CONFIG_BOOT_VERIFY_RSA_SIGNATURE
  #define MBEDTLS_RSA_C
  #define MBEDTLS_PKCS1_V15
  #endif
  
  /* mbed TLS modules */
  #define MBEDTLS_ASN1_PARSE_C
  #define MBEDTLS_ASN1_WRITE_C
  #define MBEDTLS_BIGNUM_C
  #define MBEDTLS_MD_C
  #define MBEDTLS_OID_C
  #define MBEDTLS_SHA256_C
  
  /* Save RAM by adjusting to our exact needs */
  #ifdef CONFIG_BOOT_VERIFY_RSA_SIGNATURE
  #define MBEDTLS_ECP_MAX_BITS             2048
  #define MBEDTLS_MPI_MAX_SIZE              256
  #else
  #define MBEDTLS_ECP_MAX_BITS             256
  #define MBEDTLS_MPI_MAX_SIZE              32 // 256 bits is 32 bytes
  #endif
  
  #define MBEDTLS_SSL_MAX_CONTENT_LEN 1024
  
  /* Save ROM and a few bytes of RAM by specifying our own ciphersuite list */
  #define MBEDTLS_SSL_CIPHERSUITES MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8
  
  #include "mbedtls/check_config.h"
  
  #endif /* MBEDTLS_CONFIG_BOOT_H */
  