[src/trunk]: src/share/man/man4 Update man page to reflect switch from CTR_DR...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0cf113973277
branches:  trunk
changeset: 459312:0cf113973277
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Wed Sep 04 03:15:20 2019 +0000

description:
Update man page to reflect switch from CTR_DRBG to Hash_DRBG.

diffstat:

 share/man/man4/rnd.4 |  14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diffs (42 lines):

diff -r 925e08a88f49 -r 0cf113973277 share/man/man4/rnd.4
--- a/share/man/man4/rnd.4      Tue Sep 03 21:34:03 2019 +0000
+++ b/share/man/man4/rnd.4      Wed Sep 04 03:15:20 2019 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: rnd.4,v 1.24 2017/01/18 22:38:00 abhinav Exp $
+.\"    $NetBSD: rnd.4,v 1.25 2019/09/04 03:15:20 riastradh Exp $
 .\"
 .\" Copyright (c) 2014 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd November 16, 2014
+.Dd September 3, 2019
 .Dt RND 4
 .Os
 .Sh NAME
@@ -404,9 +404,9 @@
 or
 .Pa /dev/urandom
 and first reads from it, the kernel draws from the entropy pool to seed
-a cryptographic pseudorandom number generator, the NIST CTR_DRBG
-(counter-mode deterministic random bit generator) with AES-128 as the
-block cipher, and uses that to generate data.
+a cryptographic pseudorandom number generator, the NIST Hash_DRBG
+(hash-based deterministic random bit generator) with SHA-256 as the
+hash function, and uses that to generate data.
 .Pp
 To draw a seed from the entropy pool, the kernel
 .Bl -bullet -offset abcd -compact
@@ -600,8 +600,8 @@
 .Pp
 History is littered with examples of broken entropy sources and failed
 system engineering for random number generators.
-Nobody has ever reported distinguishing AES ciphertext from uniform
-random without side channels, nor reported computing SHA-1 preimages
+Nobody has ever reported distinguishing SHA-256 hashes with secret
+inputs from uniform random, nor reported computing SHA-1 preimages
 faster than brute force.
 The folklore information-theoretic defence against computationally
 unbounded attackers replaces system engineering that successfully