mbedtls_backend_ecdh.c 4.4 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_config.h"
  41. #include "nordic_common.h"
  42. #if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)
  43. #include <string.h>
  44. #include "nrf_crypto_ecc_shared.h"
  45. #include "nrf_crypto_ecdh_shared.h"
  46. #include "nrf_crypto_shared.h"
  47. #include "nrf_crypto_ecdh.h"
  48. /*lint -save -e????*/
  49. #if !defined(MBEDTLS_CONFIG_FILE)
  50. #include "mbedtls/config.h"
  51. #else
  52. #include MBEDTLS_CONFIG_FILE
  53. #endif
  54. #include "mbedtls/ecp.h"
  55. #include "mbedtls/ecdh.h"
  56. /*lint -restore*/
  57. ret_code_t nrf_crypto_backend_mbedtls_ecdh_compute(
  58. void * p_context,
  59. void const * p_private_key,
  60. void const * p_public_key,
  61. uint8_t * p_shared_secret)
  62. {
  63. int result;
  64. mbedtls_mpi shared_secret_mpi;
  65. mbedtls_ecp_group group;
  66. nrf_crypto_backend_mbedtls_ecc_private_key_t const * p_prv =
  67. (nrf_crypto_backend_mbedtls_ecc_private_key_t const *)p_private_key;
  68. nrf_crypto_backend_mbedtls_ecc_public_key_t const * p_pub =
  69. (nrf_crypto_backend_mbedtls_ecc_public_key_t const *)p_public_key;
  70. nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
  71. if (!nrf_crypto_backend_mbedtls_ecc_group_load(&group, p_info))
  72. {
  73. return NRF_ERROR_CRYPTO_INTERNAL;
  74. }
  75. mbedtls_mpi_init(&shared_secret_mpi);
  76. result = mbedtls_ecdh_compute_shared(&group,
  77. &shared_secret_mpi,
  78. &p_pub->key,
  79. &p_prv->key,
  80. nrf_crypto_backend_mbedtls_ecc_mbedtls_rng,
  81. NULL);
  82. if (result == 0)
  83. {
  84. result = mbedtls_mpi_write_binary(&shared_secret_mpi,
  85. p_shared_secret,
  86. p_info->raw_private_key_size);
  87. }
  88. #if NRF_CRYPTO_ECC_CURVE25519_ENABLED && !NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
  89. if (p_info == &g_nrf_crypto_ecc_curve25519_curve_info)
  90. {
  91. nrf_crypto_internal_swap_endian_in_place(p_shared_secret,
  92. NRF_CRYPTO_ECDH_CURVE25519_SHARED_SECRET_SIZE);
  93. }
  94. #endif
  95. mbedtls_mpi_free(&shared_secret_mpi);
  96. mbedtls_ecp_group_free(&group);
  97. if (result != 0)
  98. {
  99. return NRF_ERROR_CRYPTO_INTERNAL;
  100. }
  101. return NRF_SUCCESS;
  102. }
  103. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)