oberon_backend_ecdsa.c 4.1 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) && \
  43. NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON) && \
  44. NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
  45. #include <stdint.h>
  46. #include <stdbool.h>
  47. #include <string.h>
  48. #include "nrf_crypto_ecc.h"
  49. #include "nrf_crypto_rng.h"
  50. #include "nrf_crypto_ecdsa.h"
  51. #include "oberon_backend_eddsa.h"
  52. #include "nrf_crypto_eddsa_shared.h"
  53. #include "ocrypto_ecdsa_p256.h"
  54. #define OBERON_HASH_SIZE_FOR_SECP256R1 (256 / 8)
  55. ret_code_t nrf_crypto_backend_secp256r1_sign(
  56. void * p_context,
  57. void const * p_private_key,
  58. uint8_t const * p_data,
  59. size_t data_size,
  60. uint8_t * p_signature)
  61. {
  62. int result;
  63. uint8_t session_key[32];
  64. nrf_crypto_backend_secp256r1_private_key_t const * p_prv =
  65. (nrf_crypto_backend_secp256r1_private_key_t const *)p_private_key;
  66. if (data_size < OBERON_HASH_SIZE_FOR_SECP256R1)
  67. {
  68. return NRF_ERROR_CRYPTO_INPUT_LENGTH;
  69. }
  70. result = nrf_crypto_backend_oberon_ecc_secp256r1_rng(session_key);
  71. if (result != NRF_SUCCESS)
  72. {
  73. return result;
  74. }
  75. result = ocrypto_ecdsa_p256_sign_hash(p_signature, p_data, p_prv->key, session_key);
  76. return result == 0 ? NRF_SUCCESS : NRF_ERROR_CRYPTO_INTERNAL;
  77. }
  78. ret_code_t nrf_crypto_backend_secp256r1_verify(
  79. void * p_context,
  80. void const * p_public_key,
  81. uint8_t const * p_data,
  82. size_t data_size,
  83. uint8_t const * p_signature)
  84. {
  85. int result;
  86. nrf_crypto_backend_secp256r1_public_key_t const * p_pub =
  87. (nrf_crypto_backend_secp256r1_public_key_t const *)p_public_key;
  88. if (data_size < OBERON_HASH_SIZE_FOR_SECP256R1)
  89. {
  90. return NRF_ERROR_CRYPTO_INPUT_LENGTH;
  91. }
  92. result = ocrypto_ecdsa_p256_verify_hash(p_signature, p_data, p_pub->key);
  93. if (result != 0)
  94. {
  95. return NRF_ERROR_CRYPTO_ECDSA_INVALID_SIGNATURE;
  96. }
  97. return NRF_SUCCESS;
  98. }
  99. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)