curl_des.c 2.1 KB

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  1. /***************************************************************************
  2. * _ _ ____ _
  3. * Project ___| | | | _ \| |
  4. * / __| | | | |_) | |
  5. * | (__| |_| | _ <| |___
  6. * \___|\___/|_| \_\_____|
  7. *
  8. * Copyright (C) Steve Holme, <steve_holme@hotmail.com>.
  9. *
  10. * This software is licensed as described in the file COPYING, which
  11. * you should have received as part of this distribution. The terms
  12. * are also available at https://curl.se/docs/copyright.html.
  13. *
  14. * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15. * copies of the Software, and permit persons to whom the Software is
  16. * furnished to do so, under the terms of the COPYING file.
  17. *
  18. * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19. * KIND, either express or implied.
  20. *
  21. * SPDX-License-Identifier: curl
  22. *
  23. ***************************************************************************/
  24. #include "curl_setup.h"
  25. #if defined(USE_CURL_NTLM_CORE) && \
  26. (defined(USE_GNUTLS) || \
  27. defined(USE_SECTRANSP) || \
  28. defined(USE_OS400CRYPTO) || \
  29. defined(USE_WIN32_CRYPTO))
  30. #include "curl_des.h"
  31. /*
  32. * Curl_des_set_odd_parity()
  33. *
  34. * This is used to apply odd parity to the given byte array. It is typically
  35. * used by when a cryptography engine does not have its own version.
  36. *
  37. * The function is a port of the Java based oddParity() function over at:
  38. *
  39. * https://davenport.sourceforge.net/ntlm.html
  40. *
  41. * Parameters:
  42. *
  43. * bytes [in/out] - The data whose parity bits are to be adjusted for
  44. * odd parity.
  45. * len [out] - The length of the data.
  46. */
  47. void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
  48. {
  49. size_t i;
  50. for(i = 0; i < len; i++) {
  51. unsigned char b = bytes[i];
  52. bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
  53. (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
  54. (b >> 1)) & 0x01) == 0;
  55. if(needs_parity)
  56. bytes[i] |= 0x01;
  57. else
  58. bytes[i] &= 0xfe;
  59. }
  60. }
  61. #endif