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92 lines
3.7 KiB
92 lines
3.7 KiB
9 years ago
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/*
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* This file is Copyright Daniel Silverstone <dsilvers@digital-scurf.org> 2006
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#ifndef LIBGFSHARE_H
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#define LIBGFSHARE_H
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#include <stdint.h>
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typedef struct _gfshare_ctx gfshare_ctx;
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typedef void (*gfshare_rand_func_t)(unsigned char*,long);
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/* This will, by default, use random(). It's not very good so you should
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* replace it (perhaps with a function which reads from /dev/urandom).
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* If you can't be bothered, be sure to srandom() before you use any
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* of the gfshare_ctx_enc_* functions
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*/
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extern gfshare_rand_func_t gfshare_fill_rand;
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/* ------------------------------------------------------[ Preparation ]---- */
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/* Initialise a gfshare context for producing shares */
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gfshare_ctx* gfshare_ctx_init_enc(unsigned char* /* sharenrs */,
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uint32_t /* sharecount */,
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unsigned char /* threshold */,
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uint32_t /* size */);
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/* Initialise a gfshare context for recombining shares */
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gfshare_ctx* gfshare_ctx_init_dec(unsigned char* /* sharenrs */,
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uint32_t /* sharecount */,
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uint32_t /* size */);
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/* Free a share context's memory. */
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void gfshare_ctx_free(gfshare_ctx* /* ctx */);
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/* --------------------------------------------------------[ Splitting ]---- */
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/* Provide a secret to the encoder. (this re-scrambles the coefficients) */
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void gfshare_ctx_enc_setsecret(gfshare_ctx* /* ctx */,
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unsigned char* /* secret */);
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/* Extract a share from the context.
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* 'share' must be preallocated and at least 'size' bytes long.
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* 'sharenr' is the index into the 'sharenrs' array of the share you want.
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*/
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void gfshare_ctx_enc_getshare(gfshare_ctx* /* ctx */,
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unsigned char /* sharenr */,
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unsigned char* /* share */);
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/* ----------------------------------------------------[ Recombination ]---- */
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/* Inform a recombination context of a change in share indexes */
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void gfshare_ctx_dec_newshares(gfshare_ctx* /* ctx */,
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unsigned char* /* sharenrs */);
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/* Provide a share context with one of the shares.
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* The 'sharenr' is the index into the 'sharenrs' array
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*/
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void gfshare_ctx_dec_giveshare(gfshare_ctx* /* ctx */,
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unsigned char /* sharenr */,
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unsigned char* /* share */);
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/* Extract the secret by interpolation of the shares.
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* secretbuf must be allocated and at least 'size' bytes long
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*/
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void gfshare_ctx_dec_extract(gfshare_ctx* /* ctx */,
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unsigned char* /* secretbuf */);
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#endif /* LIBGFSHARE_H */
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