[Midnightbsd-cvs] src [8863] trunk/lib/libc: warn against weak PRNGs

[laffer1 at midnightbsd.org]

Revision: 8863
          http://svnweb.midnightbsd.org/src/?rev=8863
Author:   laffer1
Date:     2016-09-26 09:06:56 -0400 (Mon, 26 Sep 2016)
Log Message:
-----------
warn against weak PRNGs

Modified Paths:
--------------
    trunk/lib/libc/gen/rand48.3
    trunk/lib/libc/stdlib/random.3

Modified: trunk/lib/libc/gen/rand48.3
===================================================================
--- trunk/lib/libc/gen/rand48.3	2016-09-26 13:06:28 UTC (rev 8862)
+++ trunk/lib/libc/gen/rand48.3	2016-09-26 13:06:56 UTC (rev 8863)
@@ -12,7 +12,7 @@
 .\"     @(#)rand48.3 V1.0 MB 8 Oct 1993
 .\" $MidnightBSD$
 .\"
-.Dd February 2, 2010
+.Dd September 4, 2012
 .Dt RAND48 3
 .Os
 .Sh NAME
@@ -49,6 +49,14 @@
 .Ft void
 .Fn lcong48 "unsigned short p[7]"
 .Sh DESCRIPTION
+.Bf -symbolic
+The functions described in this manual page are not cryptographically
+secure.
+Cryptographic applications should use
+.Xr arc4random 3
+instead.
+.Ef
+.Pp
 The
 .Fn rand48
 family of functions generates pseudo-random numbers using a linear
@@ -174,10 +182,8 @@
 Note that all three methods of seeding the random number generator
 always also set the multiplicand and addend for any of the six
 generator calls.
-.Pp
-For a more powerful random number generator, see
-.Xr random 3 .
 .Sh SEE ALSO
+.Xr arc4random 3 ,
 .Xr rand 3 ,
 .Xr random 3
 .Sh AUTHORS

Modified: trunk/lib/libc/stdlib/random.3
===================================================================
--- trunk/lib/libc/stdlib/random.3	2016-09-26 13:06:28 UTC (rev 8862)
+++ trunk/lib/libc/stdlib/random.3	2016-09-26 13:06:56 UTC (rev 8863)
@@ -181,7 +181,6 @@
 .Xr arc4random 3 ,
 .Xr lrand48 3 ,
 .Xr rand 3 ,
-.Xr srand 3 ,
 .Xr random 4
 .Sh HISTORY
 These