optiga_backend_ecdh.c 4.0 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_OPTIGA)
  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. #include "optiga_backend_ecc.h"
  49. /*lint -save -e????*/
  50. #include "optiga/optiga_crypt.h"
  51. /*lint -restore*/
  52. ret_code_t nrf_crypto_backend_optiga_ecdh_compute(
  53. void * p_context,
  54. void const * p_private_key,
  55. void const * p_public_key,
  56. uint8_t * p_shared_secret)
  57. {
  58. optiga_lib_status_t res = OPTIGA_LIB_ERROR;
  59. // Prepare public key
  60. nrf_crypto_backend_secp256r1_public_key_t * p_pub =
  61. (nrf_crypto_backend_secp256r1_public_key_t *) p_public_key;
  62. if (p_pub->oid != NRF_CRYPTO_INFINEON_PUBKEY_HOST_OID)
  63. {
  64. // OPTIGA requires the peer' public key to be host-supplied
  65. return NRF_ERROR_CRYPTO_INTERNAL;
  66. }
  67. // magic OID for pubkey from host
  68. public_key_from_host_t pub_key = {
  69. .public_key = p_pub->raw_pubkey,
  70. .length = 64+4, // public key + DER BITSTRING header
  71. .curve = OPTIGA_ECC_NIST_P_256
  72. };
  73. // Prepare private key
  74. nrf_crypto_backend_secp256r1_private_key_t * p_priv =
  75. (nrf_crypto_backend_secp256r1_private_key_t *) p_private_key;
  76. optiga_key_id_t priv_oid = p_priv->oid;
  77. if (priv_oid == NRF_CRYPTO_INFINEON_PRIVKEY_HOST_OID)
  78. {
  79. // OPTIGA Trust X can only compute ECDH with private key from inside OPTIGA
  80. return NRF_ERROR_CRYPTO_INTERNAL;
  81. }
  82. res = optiga_crypt_ecdh(
  83. priv_oid, // private key OID
  84. &pub_key, // peer public key details
  85. true, // true: export shared secret to host
  86. p_shared_secret // resulting shared secret
  87. );
  88. if (res != OPTIGA_LIB_SUCCESS)
  89. {
  90. // error in the optiga library
  91. return NRF_ERROR_CRYPTO_INTERNAL;
  92. }
  93. return NRF_SUCCESS;
  94. }
  95. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)