cc310_backend_ecdh.c 6.7 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_CC310)
  43. #include <string.h>
  44. #include "nrf_crypto_ecc_shared.h"
  45. #include "nrf_crypto_ecdh_shared.h"
  46. #include "nrf_crypto_ecdh.h"
  47. #include "nrf_crypto_mem.h"
  48. #include "nrf_crypto_shared.h"
  49. #include "cc310_backend_mutex.h"
  50. #include "cc310_backend_shared.h"
  51. #include "cc310_backend_ecdh.h"
  52. ret_code_t nrf_crypto_backend_cc310_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. ret_code_t result;
  59. CRYSError_t crys_error;
  60. uint32_t shared_secret_size;
  61. uint8_t aligned_buffer[(NRF_CRYPTO_ECDH_SHARED_SECRET_MAX_SIZE + 3) & ~3];
  62. uint8_t * p_output_buffer;
  63. bool mutex_locked;
  64. nrf_crypto_backend_cc310_ecdh_compute_context_t * p_ctx =
  65. (nrf_crypto_backend_cc310_ecdh_compute_context_t *)p_context;
  66. nrf_crypto_backend_cc310_ecc_private_key_t * p_prv =
  67. (nrf_crypto_backend_cc310_ecc_private_key_t *)p_private_key;
  68. nrf_crypto_backend_cc310_ecc_public_key_t * p_pub =
  69. (nrf_crypto_backend_cc310_ecc_public_key_t *)p_public_key;
  70. nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
  71. result = nrf_crypto_backend_cc310_ecc_public_key_convert(p_pub, &p_ctx->key_build_temp_data);
  72. if (result != NRF_SUCCESS)
  73. {
  74. return result;
  75. }
  76. shared_secret_size = p_info->raw_private_key_size;
  77. if ((shared_secret_size & 3) != 0) // Check if shared_secret_size is word aligned
  78. {
  79. shared_secret_size = (shared_secret_size + 3) & ~3;
  80. p_output_buffer = &aligned_buffer[0];
  81. }
  82. else
  83. {
  84. p_output_buffer = p_shared_secret;
  85. }
  86. mutex_locked = cc310_backend_mutex_trylock();
  87. if (!mutex_locked)
  88. {
  89. return NRF_ERROR_CRYPTO_BUSY;
  90. }
  91. crys_error = CRYS_ECDH_SVDP_DH(&p_pub->key.cc310_public_key,
  92. &p_prv->private_key,
  93. p_output_buffer,
  94. &shared_secret_size,
  95. &p_ctx->temp_data);
  96. cc310_backend_mutex_unlock();
  97. if (p_output_buffer != p_shared_secret)
  98. {
  99. //lint -save -e645 (Symbol 'aligned_buffer' may not have been initialized)
  100. memcpy(p_shared_secret,
  101. &aligned_buffer[3 - ((p_info->raw_private_key_size + 3) & 3)], // Bytes at the beginning that were added during padding are now skipped
  102. p_info->raw_private_key_size);
  103. //lint -restore
  104. }
  105. result = nrf_crypto_backend_cc310_ecc_error_convert(crys_error);
  106. return result;
  107. }
  108. #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_ECC_CURVE25519)
  109. ret_code_t nrf_crypto_backend_cc310_curve25519_ecdh_compute(
  110. void * p_context,
  111. void const * p_private_key,
  112. void const * p_public_key,
  113. uint8_t * p_shared_secret)
  114. {
  115. ret_code_t result;
  116. CRYSError_t crys_error;
  117. bool mutex_locked;
  118. nrf_crypto_backend_cc310_curve25519_context_t * p_ctx =
  119. (nrf_crypto_backend_cc310_curve25519_context_t *)p_context;
  120. nrf_crypto_backend_curve25519_private_key_t * p_prv =
  121. (nrf_crypto_backend_curve25519_private_key_t *)p_private_key;
  122. nrf_crypto_backend_curve25519_public_key_t * p_pub =
  123. (nrf_crypto_backend_curve25519_public_key_t *)p_public_key;
  124. nrf_crypto_ecc_curve_info_t const * p_info = p_prv->header.p_info;
  125. size_t shared_secret_size = p_info->raw_private_key_size;
  126. size_t pub_key_size = sizeof(p_pub->key);
  127. size_t prv_key_size = sizeof(p_prv->key);
  128. mutex_locked = cc310_backend_mutex_trylock();
  129. if (!mutex_locked)
  130. {
  131. return NRF_ERROR_CRYPTO_BUSY;
  132. }
  133. crys_error = CRYS_ECMONT_Scalarmult(p_shared_secret,
  134. &shared_secret_size,
  135. p_prv->key,
  136. prv_key_size,
  137. p_pub->key,
  138. pub_key_size,
  139. &p_ctx->temp_data);
  140. cc310_backend_mutex_unlock();
  141. // Swap endianess (only for Curve25519)
  142. #if NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
  143. nrf_crypto_internal_swap_endian_in_place(p_shared_secret,
  144. NRF_CRYPTO_ECDH_CURVE25519_SHARED_SECRET_SIZE);
  145. #endif
  146. result = nrf_crypto_backend_cc310_ecc_error_convert(crys_error);
  147. return result;
  148. }
  149. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310_ECC_CURVE25519)
  150. #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_CC310)