X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/099355bc239ba5c0c066be2924fbf0930744ee2f..8404fd750e8d1a635ccb3895e4f0e155e5f5e3cf:/noise.h

diff --git a/noise.h b/noise.h
index b8a0050..9252809 100644
--- a/noise.h
+++ b/noise.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: noise.h,v 1.3 1999/12/22 15:57:55 mdw Exp $
+ * $Id: noise.h,v 1.5 2004/04/02 01:03:49 mdw Exp $
  *
  * Acquisition of environmental noise (Unix-specific)
  *
@@ -30,6 +30,13 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: noise.h,v $
+ * Revision 1.5  2004/04/02 01:03:49  mdw
+ * Miscellaneous constification.
+ *
+ * Revision 1.4  2000/06/17 12:57:47  mdw
+ * New free counter noise generator, for use if /dev/random is
+ * unavailable.
+ *
  * Revision 1.3  1999/12/22 15:57:55  mdw
  * Label system-specific parts more clearly.
  *
@@ -58,7 +65,7 @@
 
 /*----- Noise source definition -------------------------------------------*/
 
-extern rand_source noise_source;
+extern const rand_source noise_source;
 
 /*----- Magic numbers -----------------------------------------------------*/
 
@@ -133,6 +140,32 @@ extern void noise_setid(uid_t /*uid*/, gid_t /*gid*/);
 
 extern int noise_filter(rand_pool */*r*/, int /*good*/, const char */*c*/);
 
+/* --- @noise_freewheel@ --- *
+ *
+ * Arguments:	@rand_pool *r@ = pointer to a randomness pool
+ *
+ * Returns:	Nonzero if some randomness was contributed.
+ *
+ * Use:		Runs a free counter for a short while as a desparate attempt
+ *		to get randomness from somewhere.  This is actually quite
+ *		effective.
+ */
+
+int noise_freewheel(rand_pool */*r*/);
+
+/* --- @noise_enquire@ --- *
+ *
+ * Arguments:	@rand_pool *r@ = pointer to a randomness pool
+ *
+ * Returns:	Nonzero if some randomness was contributed.
+ *
+ * Use:		Runs some shell commands to enquire about the prevailing
+ *		environment.  This can gather quite a lot of low-quality
+ *		entropy.
+ */
+
+extern int noise_enquire(rand_pool */*r*/);
+
 /* --- @noise_acquire@ --- *
  *
  * Arguments:	@rand_pool *r@ = pointer to a randomness pool