micro_ecc_backend_ecdsa.c 5.5 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_MICRO_ECC)
  43. #include <stdint.h>
  44. #include <stdbool.h>
  45. #include <string.h>
  46. #include "nrf_crypto_ecc.h"
  47. #include "nrf_crypto_ecdsa.h"
  48. #include "nrf_crypto_shared.h"
  49. #include "nrf_crypto_mem.h"
  50. #include "micro_ecc_backend_ecc.h"
  51. #include "micro_ecc_backend_shared.h"
  52. #include "uECC.h"
  53. ret_code_t nrf_crypto_backend_micro_ecc_sign(
  54. void * p_context,
  55. void const * p_private_key,
  56. uint8_t const * p_data,
  57. size_t data_size,
  58. uint8_t * p_signature)
  59. {
  60. int result;
  61. nrf_crypto_backend_micro_ecc_common_key_t const * p_prv =
  62. (nrf_crypto_backend_micro_ecc_common_key_t const *)p_private_key;
  63. uECC_Curve p_micro_ecc_curve = nrf_crypto_backend_micro_ecc_curve_get(p_prv);
  64. #if ECC_BACKEND_SWAP_BYTES
  65. nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
  66. size_t hash_size = MIN(data_size, p_info->raw_private_key_size);
  67. uint8_t hash_le[NRF_CRYPTO_ECC_RAW_PRIVATE_KEY_MAX_SIZE];
  68. nrf_crypto_internal_swap_endian(hash_le, p_data, hash_size);
  69. uECC_set_rng(nrf_crypto_backend_micro_ecc_rng_callback);
  70. result = uECC_sign((uint8_t const *)(&p_prv->key[0]),
  71. hash_le,
  72. hash_size,
  73. p_signature,
  74. p_micro_ecc_curve);
  75. nrf_crypto_internal_double_swap_endian_in_place(p_signature, p_info->raw_private_key_size);
  76. #else
  77. uECC_set_rng(nrf_crypto_backend_micro_ecc_rng_callback);
  78. result = uECC_sign((uint8_t const *)(&p_prv->key[0]),
  79. p_data,
  80. data_size,
  81. p_signature,
  82. p_micro_ecc_curve);
  83. #endif
  84. if (result == 0)
  85. {
  86. return NRF_ERROR_CRYPTO_INTERNAL;
  87. }
  88. return NRF_SUCCESS;
  89. }
  90. ret_code_t nrf_crypto_backend_micro_ecc_verify(
  91. void * p_context,
  92. void const * p_public_key,
  93. uint8_t const * p_data,
  94. size_t data_size,
  95. uint8_t const * p_signature)
  96. {
  97. int result;
  98. nrf_crypto_backend_micro_ecc_common_key_t const * p_pub =
  99. (nrf_crypto_backend_micro_ecc_common_key_t const *)p_public_key;
  100. uECC_Curve p_micro_ecc_curve = nrf_crypto_backend_micro_ecc_curve_get(p_pub);
  101. #if ECC_BACKEND_SWAP_BYTES
  102. nrf_crypto_ecc_curve_info_t const * p_info = p_pub->header.p_info;
  103. size_t hash_size = MIN(data_size, p_info->raw_private_key_size);
  104. uint8_t hash_le [NRF_CRYPTO_ECC_RAW_PRIVATE_KEY_MAX_SIZE];
  105. uint8_t signature_le[NRF_CRYPTO_ECDSA_SIGNATURE_MAX_SIZE];
  106. nrf_crypto_internal_swap_endian(hash_le, p_data, hash_size);
  107. nrf_crypto_internal_double_swap_endian(signature_le,
  108. p_signature,
  109. p_info->raw_private_key_size);
  110. result = uECC_verify((uint8_t const *)(&p_pub->key[0]),
  111. hash_le,
  112. hash_size,
  113. signature_le,
  114. p_micro_ecc_curve);
  115. #else
  116. result = uECC_verify((uint8_t const *)(&p_pub->key[0]),
  117. p_data,
  118. data_size,
  119. p_signature,
  120. p_micro_ecc_curve);
  121. #endif
  122. if (result == 0)
  123. {
  124. return NRF_ERROR_CRYPTO_ECDSA_INVALID_SIGNATURE;
  125. }
  126. return NRF_SUCCESS;
  127. }
  128. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MICRO_ECC)