oberon_backend_ecdh.c 4.3 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_OBERON)
  43. #include <stdint.h>
  44. #include "nrf_crypto_ecc.h"
  45. #include "nrf_crypto_ecdh.h"
  46. #include "nrf_crypto_shared.h"
  47. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
  48. #include "ocrypto_ecdh_p256.h"
  49. #endif
  50. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
  51. #include "ocrypto_curve25519.h"
  52. #endif
  53. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
  54. ret_code_t nrf_crypto_backend_secp256r1_ecdh_compute(
  55. void * p_context,
  56. void const * p_private_key,
  57. void const * p_public_key,
  58. uint8_t * p_shared_secret)
  59. {
  60. int result;
  61. nrf_crypto_backend_secp256r1_private_key_t const * p_prv =
  62. (nrf_crypto_backend_secp256r1_private_key_t const *)p_private_key;
  63. nrf_crypto_backend_secp256r1_public_key_t const * p_pub =
  64. (nrf_crypto_backend_secp256r1_public_key_t const *)p_public_key;
  65. result = ocrypto_ecdh_p256_common_secret(p_shared_secret, p_prv->key, p_pub->key);
  66. if (result != 0)
  67. {
  68. return NRF_ERROR_CRYPTO_INTERNAL;
  69. }
  70. return NRF_SUCCESS;
  71. }
  72. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
  73. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
  74. ret_code_t nrf_crypto_backend_curve25519_ecdh_compute(
  75. void * p_context,
  76. void const * p_private_key,
  77. void const * p_public_key,
  78. uint8_t * p_shared_secret)
  79. {
  80. nrf_crypto_backend_curve25519_private_key_t const * p_prv =
  81. (nrf_crypto_backend_curve25519_private_key_t const *)p_private_key;
  82. nrf_crypto_backend_curve25519_public_key_t const * p_pub =
  83. (nrf_crypto_backend_curve25519_public_key_t const *)p_public_key;
  84. // Private key can be completely random at this point.
  85. // Oberon library updates bits in the key according to Curve25519 specification before use.
  86. ocrypto_curve25519_scalarmult(p_shared_secret, p_prv->key, p_pub->key);
  87. #if NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
  88. nrf_crypto_internal_swap_endian_in_place(p_shared_secret,
  89. NRF_CRYPTO_ECDH_CURVE25519_SHARED_SECRET_SIZE);
  90. #endif
  91. return NRF_SUCCESS;
  92. }
  93. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
  94. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON)