/usr/include/libgfshare.h is in libgfshare-dev 2.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | /*
* This file is Copyright Daniel Silverstone <dsilvers@digital-scurf.org> 2006,2015
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
#ifndef LIBGFSHARE_H
#define LIBGFSHARE_H
typedef struct _gfshare_ctx gfshare_ctx;
typedef void (*gfshare_rand_func_t)(unsigned char*, unsigned int);
/* This will, use random(). It's not very good so you should not use it unless
* you must. If you can't be bothered to write your own, be sure to srandom()
* before you use any of the gfshare_ctx_enc_* functions
*/
extern const gfshare_rand_func_t gfshare_bad_idea_but_fill_rand_using_random;
/* This must be filled out before running any of the gfshare_ctx_enc_* calls
* or bad things will happen since it is initialised to NULL be default.
* You should fill this with a routine which uses urandom or similar ideally.
* If you cannot do that on your platform, you can use the function provided
* which does random() calls, but I recommend against it unless you must.
*/
extern gfshare_rand_func_t gfshare_fill_rand;
/* ------------------------------------------------------[ Preparation ]---- */
/* Initialise a gfshare context for producing shares */
gfshare_ctx* gfshare_ctx_init_enc(unsigned char* /* sharenrs */,
unsigned int /* sharecount */,
unsigned char /* threshold */,
unsigned int /* size */);
/* Initialise a gfshare context for recombining shares */
gfshare_ctx* gfshare_ctx_init_dec(unsigned char* /* sharenrs */,
unsigned int /* sharecount */,
unsigned int /* size */);
/* Free a share context's memory. */
void gfshare_ctx_free(gfshare_ctx* /* ctx */);
/* --------------------------------------------------------[ Splitting ]---- */
/* Provide a secret to the encoder. (this re-scrambles the coefficients) */
void gfshare_ctx_enc_setsecret(gfshare_ctx* /* ctx */,
unsigned char* /* secret */);
/* Extract a share from the context.
* 'share' must be preallocated and at least 'size' bytes long.
* 'sharenr' is the index into the 'sharenrs' array of the share you want.
*/
void gfshare_ctx_enc_getshare(gfshare_ctx* /* ctx */,
unsigned char /* sharenr */,
unsigned char* /* share */);
/* ----------------------------------------------------[ Recombination ]---- */
/* Inform a recombination context of a change in share indexes */
void gfshare_ctx_dec_newshares(gfshare_ctx* /* ctx */,
unsigned char* /* sharenrs */);
/* Provide a share context with one of the shares.
* The 'sharenr' is the index into the 'sharenrs' array
*/
void gfshare_ctx_dec_giveshare(gfshare_ctx* /* ctx */,
unsigned char /* sharenr */,
unsigned char* /* share */);
/* Extract the secret by interpolation of the shares.
* secretbuf must be allocated and at least 'size' bytes long
*/
void gfshare_ctx_dec_extract(gfshare_ctx* /* ctx */,
unsigned char* /* secretbuf */);
#endif /* LIBGFSHARE_H */
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