mbedtls_backend_init.c 3.6 KB

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  1. /**
  2. * Copyright (c) 2018 - 2020, Nordic Semiconductor ASA
  3. *
  4. * All rights reserved.
  5. *
  6. * Redistribution and use in source and binary forms, with or without modification,
  7. * are permitted provided that the following conditions are met:
  8. *
  9. * 1. Redistributions of source code must retain the above copyright notice, this
  10. * list of conditions and the following disclaimer.
  11. *
  12. * 2. Redistributions in binary form, except as embedded into a Nordic
  13. * Semiconductor ASA integrated circuit in a product or a software update for
  14. * such product, must reproduce the above copyright notice, this list of
  15. * conditions and the following disclaimer in the documentation and/or other
  16. * materials provided with the distribution.
  17. *
  18. * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
  19. * contributors may be used to endorse or promote products derived from this
  20. * software without specific prior written permission.
  21. *
  22. * 4. This software, with or without modification, must only be used with a
  23. * Nordic Semiconductor ASA integrated circuit.
  24. *
  25. * 5. Any software provided in binary form under this license must not be reverse
  26. * engineered, decompiled, modified and/or disassembled.
  27. *
  28. * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
  29. * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  30. * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
  31. * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
  32. * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33. * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  34. * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  37. * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  38. *
  39. */
  40. #include "sdk_common.h"
  41. #include "sdk_config.h"
  42. #if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)
  43. #include <string.h>
  44. #include <stdint.h>
  45. #include "nrf_crypto_init.h"
  46. #include "nrf_crypto_mem.h"
  47. /*lint -save -e????*/
  48. #include "mbedtls/platform.h"
  49. /*lint -restore*/
  50. #if NRF_CRYPTO_ALLOC_ON_STACK
  51. #error "MBED TLS backend does not support memory allocation on stack. Use different allocator."
  52. #endif
  53. /** @internal @brief Function to use NRF_CRYPTO_ALLOC for MBED TLS memory allocation.
  54. */
  55. static void * mbedtls_backend_calloc(size_t count, size_t size)
  56. {
  57. size_t total_size = count * size;
  58. void * p_data = NRF_CRYPTO_ALLOC(total_size);
  59. if (p_data != NULL)
  60. {
  61. memset(p_data, 0, total_size);
  62. }
  63. return p_data;
  64. }
  65. /** @internal @brief Function to use NRF_CRYPTO_FREE for MBED TLS memory deallocation.
  66. */
  67. static void mbedtls_backend_free(void * p_data)
  68. {
  69. NRF_CRYPTO_FREE(p_data);
  70. }
  71. /** @internal @brief Function to initialize MBED TLS backend - setup memory management for.
  72. */
  73. static ret_code_t mbedtls_backend_init(void)
  74. {
  75. (void)mbedtls_platform_set_calloc_free(mbedtls_backend_calloc, mbedtls_backend_free);
  76. return NRF_SUCCESS;
  77. }
  78. /** @internal @brief Function to uninitialize MBED TLS backend - currently no implementation is required.
  79. */
  80. static ret_code_t mbedtls_backend_uninit(void)
  81. {
  82. // Empty implementation
  83. return NRF_SUCCESS;
  84. }
  85. CRYPTO_BACKEND_REGISTER(nrf_crypto_backend_info_t const mbedtls_backend) =
  86. {
  87. .init_fn = mbedtls_backend_init,
  88. .uninit_fn = mbedtls_backend_uninit,
  89. };
  90. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)