cast5.h 2.5 KB

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  1. /*
  2. * An implementation of the CAST128 algorithm as mentioned in RFC2144
  3. * Copyright (c) 2014 Supraja Meedinti
  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_CAST5_H
  22. #define AVUTIL_CAST5_H
  23. #include <stdint.h>
  24. /**
  25. * @file
  26. * @brief Public header for libavutil CAST5 algorithm
  27. * @defgroup lavu_cast5 CAST5
  28. * @ingroup lavu_crypto
  29. * @{
  30. */
  31. extern const int av_cast5_size;
  32. struct AVCAST5;
  33. /**
  34. * Allocate an AVCAST5 context
  35. * To free the struct: av_free(ptr)
  36. */
  37. struct AVCAST5 *av_cast5_alloc(void);
  38. /**
  39. * Initialize an AVCAST5 context.
  40. *
  41. * @param ctx an AVCAST5 context
  42. * @param key a key of 5,6,...16 bytes used for encryption/decryption
  43. * @param key_bits number of keybits: possible are 40,48,...,128
  44. * @return 0 on success, less than 0 on failure
  45. */
  46. int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits);
  47. /**
  48. * Encrypt or decrypt a buffer using a previously initialized context, ECB mode only
  49. *
  50. * @param ctx an AVCAST5 context
  51. * @param dst destination array, can be equal to src
  52. * @param src source array, can be equal to dst
  53. * @param count number of 8 byte blocks
  54. * @param decrypt 0 for encryption, 1 for decryption
  55. */
  56. void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, int decrypt);
  57. /**
  58. * Encrypt or decrypt a buffer using a previously initialized context
  59. *
  60. * @param ctx an AVCAST5 context
  61. * @param dst destination array, can be equal to src
  62. * @param src source array, can be equal to dst
  63. * @param count number of 8 byte blocks
  64. * @param iv initialization vector for CBC mode, NULL for ECB mode
  65. * @param decrypt 0 for encryption, 1 for decryption
  66. */
  67. void av_cast5_crypt2(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
  68. /**
  69. * @}
  70. */
  71. #endif /* AVUTIL_CAST5_H */