tSeal_util.cpp 2.6 KB

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  1. /*
  2. * Copyright (C) 2011-2018 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #include "sgx_tseal.h"
  32. #ifndef UINT32_MAX
  33. #define UINT32_MAX 0xffffffffU
  34. #endif
  35. uint32_t sgx_calc_sealed_data_size(const uint32_t add_mac_txt_size, const uint32_t txt_encrypt_size)
  36. {
  37. if(add_mac_txt_size > UINT32_MAX - txt_encrypt_size)
  38. return UINT32_MAX;
  39. uint32_t payload_size = add_mac_txt_size + txt_encrypt_size; //Calculate the payload size
  40. if(payload_size > UINT32_MAX - sizeof(sgx_sealed_data_t))
  41. return UINT32_MAX;
  42. return (uint32_t)(sizeof(sgx_sealed_data_t) + payload_size);
  43. }
  44. uint32_t sgx_get_add_mac_txt_len(const sgx_sealed_data_t* p_sealed_data)
  45. {
  46. if(p_sealed_data == NULL)
  47. return UINT32_MAX;
  48. uint32_t data_size = p_sealed_data->aes_data.payload_size - p_sealed_data->plain_text_offset;
  49. if (data_size > p_sealed_data->aes_data.payload_size)
  50. return UINT32_MAX;
  51. return data_size;
  52. }
  53. uint32_t sgx_get_encrypt_txt_len(const sgx_sealed_data_t* p_sealed_data)
  54. {
  55. return ((p_sealed_data == NULL) ? UINT32_MAX : p_sealed_data->plain_text_offset);
  56. }