micro_ecc_backend_ecdh.c 3.7 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103
  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_MICRO_ECC)
  43. #include <string.h>
  44. #include "nrf_crypto_ecc_shared.h"
  45. #include "nrf_crypto_ecdh_shared.h"
  46. #include "nrf_crypto_ecdh.h"
  47. #include "nrf_crypto_shared.h"
  48. #include "micro_ecc_backend_ecc.h"
  49. #include "micro_ecc_backend_shared.h"
  50. #include "uECC.h"
  51. ret_code_t nrf_crypto_backend_micro_ecc_ecdh_compute(
  52. void * p_context,
  53. void const * p_private_key,
  54. void const * p_public_key,
  55. uint8_t * p_shared_secret)
  56. {
  57. int result;
  58. nrf_crypto_backend_micro_ecc_common_key_t const * p_prv =
  59. (nrf_crypto_backend_micro_ecc_common_key_t const *)p_private_key;
  60. nrf_crypto_backend_micro_ecc_common_key_t const * p_pub =
  61. (nrf_crypto_backend_micro_ecc_common_key_t const *)p_public_key;
  62. nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
  63. uECC_Curve p_micro_ecc_curve = nrf_crypto_backend_micro_ecc_curve_get(p_prv);
  64. // Check that the public key is valid
  65. if (!uECC_valid_public_key((uint8_t *)(&p_pub->key[0]), p_micro_ecc_curve))
  66. {
  67. return NRF_ERROR_CRYPTO_INTERNAL;
  68. }
  69. result = uECC_shared_secret((uint8_t const *)(&p_pub->key[0]),
  70. (uint8_t const *)(&p_prv->key[0]),
  71. p_shared_secret,
  72. p_micro_ecc_curve);
  73. #if ECC_BACKEND_SWAP_BYTES
  74. nrf_crypto_internal_swap_endian_in_place(p_shared_secret, p_info->raw_private_key_size);
  75. #else
  76. UNUSED_PARAMETER(p_info);
  77. #endif
  78. if (result == 0)
  79. {
  80. return NRF_ERROR_CRYPTO_INTERNAL;
  81. }
  82. return NRF_SUCCESS;
  83. }
  84. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MICRO_ECC)