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Add CRC as another hash function.
[u/mdw/catacomb]
/
gfshare.c
diff --git
a/gfshare.c
b/gfshare.c
index
0af17cc
..
09d3e89
100644
(file)
--- a/
gfshare.c
+++ b/
gfshare.c
@@
-1,6
+1,6
@@
/* -*-c-*-
*
/* -*-c-*-
*
- * $Id: gfshare.c,v 1.
4 2000/06/24 18:29:05
mdw Exp $
+ * $Id: gfshare.c,v 1.
6 2000/12/06 20:30:10
mdw Exp $
*
* Secret sharing over %$\gf(2^8)$%
*
*
* Secret sharing over %$\gf(2^8)$%
*
@@
-30,6
+30,13
@@
/*----- Revision history --------------------------------------------------*
*
* $Log: gfshare.c,v $
/*----- Revision history --------------------------------------------------*
*
* $Log: gfshare.c,v $
+ * Revision 1.6 2000/12/06 20:30:10 mdw
+ * Change secret sharing interface: present the secret at share
+ * construction time.
+ *
+ * Revision 1.5 2000/06/24 19:11:47 mdw
+ * Fix daft error in the comment for @gfshare_get@.
+ *
* Revision 1.4 2000/06/24 18:29:05 mdw
* Interface change: allow shares to be extracted from a context on demand,
* rather than building them all up-front.
* Revision 1.4 2000/06/24 18:29:05 mdw
* Interface change: allow shares to be extracted from a context on demand,
* rather than building them all up-front.
@@
-83,7
+90,6
@@
void gfshare_create(gfshare *s, unsigned t, size_t sz)
s->t = t;
s->i = 0;
s->sz = sz;
s->t = t;
s->i = 0;
s->sz = sz;
- s->s = 0;
s->v = 0;
}
s->v = 0;
}
@@
-108,22
+114,23
@@
void gfshare_destroy(gfshare *s)
*
* Arguments: @gfshare *s@ = pointer to share context to fill in
* @grand *r@ = pointer to random number source
*
* Arguments: @gfshare *s@ = pointer to share context to fill in
* @grand *r@ = pointer to random number source
+ * @const void *buf@ = pointer to the secret to share
*
* Returns: ---
*
* Use: Initializes a sharing context to be able to create shares.
* The context structure is expected to be mostly filled in. In
*
* Returns: ---
*
* Use: Initializes a sharing context to be able to create shares.
* The context structure is expected to be mostly filled in. In
- * particular, @t@
and @s@ must be initialized. If @v@ is zero,
- *
a vector of appropriate size is allocated. You should us
e
- *
the macro @GFSHARE_INIT@ or @gfshare_create@ to construct
- *
sharing
contexts.
+ * particular, @t@
must be initialized. If @v@ is zero, a
+ *
vector of appropriate size is allocated. You should use th
e
+ *
macro @GFSHARE_INIT@ or @gfshare_create@ to construct sharing
+ * contexts.
*/
*/
-void gfshare_mkshares(gfshare *s, grand *r)
+void gfshare_mkshares(gfshare *s, grand *r
, const void *buf
)
{
s->v = XS_ALLOC(s->sz * s->t);
r->ops->fill(r, s->v, s->sz * (s->t - 1));
{
s->v = XS_ALLOC(s->sz * s->t);
r->ops->fill(r, s->v, s->sz * (s->t - 1));
- memcpy(s->v + s->sz * (s->t - 1),
s->s
, s->sz);
+ memcpy(s->v + s->sz * (s->t - 1),
buf
, s->sz);
}
/* --- @gfshare_get@ --- *
}
/* --- @gfshare_get@ --- *
@@
-132,7
+139,7
@@
void gfshare_mkshares(gfshare *s, grand *r)
* @unsigned x@ = share index to fetch
* @void *buf@ = pointer to output buffer
*
* @unsigned x@ = share index to fetch
* @void *buf@ = pointer to output buffer
*
- * Returns:
The share, as requested.
+ * Returns:
---
*
* Use: Extracts a share from the system. You may extract up to 255
* shares from the system. Shares are indexed from 0.
*
* Use: Extracts a share from the system. You may extract up to 255
* shares from the system. Shares are indexed from 0.
@@
-287,9
+294,8
@@
static int verify(grand *r)
r->ops->fill(r, sec, len);
gfshare_create(&s, t, len);
r->ops->fill(r, sec, len);
gfshare_create(&s, t, len);
- s.s = sec;
- gfshare_mkshares(&s, r);
+ gfshare_mkshares(&s, r
, sec
);
for (i = 0; i < t; i++)
gfshare_get(&s, p[i], v + (i * len));
gfshare_destroy(&s);
for (i = 0; i < t; i++)
gfshare_get(&s, p[i], v + (i * len));
gfshare_destroy(&s);