des.h 1.7 KB

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  1. /*
  2. * DES encryption/decryption
  3. * Copyright (c) 2007 Reimar Doeffinger
  4. *
  5. * This file is part of FFmpeg.
  6. *
  7. * FFmpeg is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU Lesser General Public
  9. * License as published by the Free Software Foundation; either
  10. * version 2.1 of the License, or (at your option) any later version.
  11. *
  12. * FFmpeg is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15. * Lesser General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Lesser General Public
  18. * License along with FFmpeg; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20. */
  21. #ifndef AVUTIL_DES_H
  22. #define AVUTIL_DES_H
  23. #include <stdint.h>
  24. struct AVDES {
  25. uint64_t round_keys[3][16];
  26. int triple_des;
  27. };
  28. /**
  29. * @brief Initializes an AVDES context.
  30. *
  31. * @param key_bits must be 64 or 192
  32. * @param decrypt 0 for encryption, 1 for decryption
  33. */
  34. int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
  35. /**
  36. * @brief Encrypts / decrypts using the DES algorithm.
  37. *
  38. * @param count number of 8 byte blocks
  39. * @param dst destination array, can be equal to src, must be 8-byte aligned
  40. * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
  41. * @param iv initialization vector for CBC mode, if NULL then ECB will be used,
  42. * must be 8-byte aligned
  43. * @param decrypt 0 for encryption, 1 for decryption
  44. */
  45. void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
  46. #endif /* AVUTIL_DES_H */