include/fileeq.h

   1
   2 /*
   3  * No copyright is claimed.  This code is in the public domain; do with
   4  * it what you wish.
   5  */
   6 #ifndef UTIL_LINUX_FILEEQ
   7 #define UTIL_LINUX_FILEEQ
   8
   9 #include <stdlib.h>
  10 #include <stdint.h>
  11 #include <stdbool.h>
  12
  13 #if defined(__linux__) && defined(HAVE_LINUX_IF_ALG_H)
  14 # define USE_FILEEQ_CRYPTOAPI 1
  15 #endif
  16
  17 /* Number of bytes from the beginning of the file we always
  18  * compare by memcmp() */
  19 #define UL_FILEEQ_INTROSIZ      32
  20
  21 struct ul_fileeq_data {
  22         unsigned char intro[UL_FILEEQ_INTROSIZ];
  23         unsigned char *blocks;
  24         size_t nblocks;
  25         size_t maxblocks;
  26         int fd;
  27         const char *name;
  28         bool is_eof;
  29 };
  30
  31 struct ul_fileeq {
  32         int fd_api;     /* Crypto socket */
  33         int fd_cip;     /* Cipher handler */
  34
  35         size_t readsiz;
  36         uint64_t filesiz;
  37         uint64_t blocksmax;
  38         const struct ul_fileeq_method *method;
  39
  40         /* UL_FILEEQ_MEMCMP buffers */
  41         unsigned char *buf_a;
  42         unsigned char *buf_b;
  43         unsigned char *buf_last;
  44 };
  45
  46 extern int ul_fileeq_init(struct ul_fileeq *eq, const char *method);
  47 extern void ul_fileeq_deinit(struct ul_fileeq *eq);
  48
  49
  50 extern int ul_fileeq_data_associated(struct ul_fileeq_data *data);
  51 extern void ul_fileeq_data_close_file(struct ul_fileeq_data *data);
  52 extern void ul_fileeq_data_init(struct ul_fileeq_data *data);
  53 extern void ul_fileeq_data_deinit(struct ul_fileeq_data *data);
  54 extern void ul_fileeq_data_set_file(struct ul_fileeq_data *data,
  55                                     const char *name);
  56 extern size_t ul_fileeq_set_size(struct ul_fileeq *eq, uint64_t filesiz,
  57                                  size_t readsiz, size_t memsiz);
  58
  59 extern int ul_fileeq(struct ul_fileeq *eq,
  60               struct ul_fileeq_data *a, struct ul_fileeq_data *b);
  61
  62 #endif /* UTIL_LINUX_FILEEQ */