libotp.h

   1 /** Practical One-time Pad Library
   2  *
   3  * Created:20080514
   4  * By Jeff Connelly
   5  */
   6
   7 #define MARKER_TO               "to:"
   8 #define MARKER_BEGIN            "--EMOTP_BEGIN--"
   9 #define MARKER_END              "--EMOTP_END--"
  10
  11 #define OFFSET_FILE_EXTENSION   ".off"
  12 #define OFFSET_SIZE             11      /* strlen("4294967296") + 1 */
  13
  14 #define PAD_NAME_LENGTH         4
  15
  16 /** Packaged up encrypted message, ready for transport. */
  17 typedef struct _MESSAGE {
  18     unsigned long offset;
  19     char pad_name[PAD_NAME_LENGTH];
  20     unsigned long length;
  21     char *cipher_text;
  22 } MESSAGE;
  23
  24 typedef struct _PAD {
  25     char *local_filename;
  26     char *name;
  27     FILE *fp;
  28     struct _PAD *next;
  29     /* Use read_offset() and write_offset() to access offset. */
  30 } PAD;
  31
  32 void show_pads();
  33 FILE *open_offset_file(PAD *p, char *mode);
  34 unsigned long read_offset(PAD *p);
  35 void write_offset(PAD *p, unsigned long offset);
  36 void load_pad(char *local_filename);
  37 void free_pads();
  38 MESSAGE *unpackage();
  39 void free_message(MESSAGE *);