optiga_backend_rng.c 4.8 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_common.h"
  41. #if NRF_MODULE_ENABLED(NRF_CRYPTO)
  42. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
  43. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
  44. #include "nrf_crypto_rng.h"
  45. #include "optiga_backend_rng.h"
  46. #include "optiga/optiga_crypt.h"
  47. /** @brief Minimal size output of random data in OPTIGA Trust X
  48. *
  49. * @details See Solution Reference Manual v1.35, section 4.4.3.4
  50. */
  51. #define OPTIGA_RNG_MIN_SIZE (0x8)
  52. /** @brief Maximum size output of random data in OPTIGA Trust X
  53. *
  54. * @details See Solution Reference Manual v1.35, section 4.4.3.4
  55. */
  56. #define OPTIGA_RNG_MAX_SIZE (0x100)
  57. ret_code_t nrf_crypto_rng_backend_init(void * const p_context,
  58. void * const p_temp_buffer)
  59. {
  60. UNUSED_PARAMETER(p_context);
  61. UNUSED_PARAMETER(p_temp_buffer);
  62. return NRF_SUCCESS;
  63. }
  64. ret_code_t nrf_crypto_rng_backend_uninit(void * const p_context)
  65. {
  66. UNUSED_PARAMETER(p_context);
  67. return NRF_SUCCESS;
  68. }
  69. ret_code_t nrf_crypto_rng_backend_vector_generate(void * const p_context,
  70. uint8_t * const p_target,
  71. size_t size,
  72. bool use_mutex)
  73. {
  74. UNUSED_PARAMETER(use_mutex);
  75. UNUSED_PARAMETER(p_context);
  76. uint8_t backup[OPTIGA_RNG_MIN_SIZE] = {0};
  77. optiga_lib_status_t err;
  78. uint8_t * out_cur = p_target;
  79. size_t size_left = size;
  80. size_t cur_len = size_left;
  81. do
  82. {
  83. cur_len = size_left > OPTIGA_RNG_MAX_SIZE ? OPTIGA_RNG_MAX_SIZE : size_left;
  84. if (cur_len < OPTIGA_RNG_MIN_SIZE)
  85. {
  86. err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, backup, OPTIGA_RNG_MIN_SIZE);
  87. if(err != OPTIGA_LIB_SUCCESS)
  88. {
  89. return NRF_ERROR_CRYPTO_INTERNAL;
  90. }
  91. memcpy(out_cur, backup, cur_len);
  92. }
  93. else
  94. {
  95. err = optiga_crypt_random(OPTIGA_RNG_TYPE_TRNG, out_cur, cur_len);
  96. if (err != OPTIGA_LIB_SUCCESS)
  97. {
  98. return NRF_ERROR_CRYPTO_INTERNAL;
  99. }
  100. }
  101. out_cur += cur_len;
  102. size_left -= cur_len;
  103. } while(size_left > 0);
  104. return NRF_SUCCESS;
  105. }
  106. ret_code_t nrf_crypto_rng_backend_reseed(void * const p_context,
  107. void * p_temp_buffer,
  108. uint8_t * p_input_data,
  109. size_t size)
  110. {
  111. UNUSED_PARAMETER(p_context);
  112. UNUSED_PARAMETER(p_temp_buffer);
  113. UNUSED_PARAMETER(p_input_data);
  114. UNUSED_PARAMETER(size);
  115. return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
  116. }
  117. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_RNG)
  118. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
  119. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO)