diff options
| author | tls <tls@NetBSD.org> | 2011-11-19 22:51:18 +0000 |
|---|---|---|
| committer | tls <tls@NetBSD.org> | 2011-11-19 22:51:18 +0000 |
| commit | 8e9334525367ba7642ed9b753a94935c07817c19 (patch) | |
| tree | 1b53338e20cd060235386b574dbf34d8cf11d50f /sys/dev/mca | |
| parent | 836ffd606791f7517a3ff458821d8013500d001c (diff) | |
First step of random number subsystem rework described in
<20111022023242.BA26F14A158@mail.netbsd.org>. This change includes
the following:
An initial cleanup and minor reorganization of the entropy pool
code in sys/dev/rnd.c and sys/dev/rndpool.c. Several bugs are
fixed. Some effort is made to accumulate entropy more quickly at
boot time.
A generic interface, "rndsink", is added, for stream generators to
request that they be re-keyed with good quality entropy from the pool
as soon as it is available.
The arc4random()/arc4randbytes() implementation in libkern is
adjusted to use the rndsink interface for rekeying, which helps
address the problem of low-quality keys at boot time.
An implementation of the FIPS 140-2 statistical tests for random
number generator quality is provided (libkern/rngtest.c). This
is based on Greg Rose's implementation from Qualcomm.
A new random stream generator, nist_ctr_drbg, is provided. It is
based on an implementation of the NIST SP800-90 CTR_DRBG by
Henric Jungheim. This generator users AES in a modified counter
mode to generate a backtracking-resistant random stream.
An abstraction layer, "cprng", is provided for in-kernel consumers
of randomness. The arc4random/arc4randbytes API is deprecated for
in-kernel use. It is replaced by "cprng_strong". The current
cprng_fast implementation wraps the existing arc4random
implementation. The current cprng_strong implementation wraps the
new CTR_DRBG implementation. Both interfaces are rekeyed from
the entropy pool automatically at intervals justifiable from best
current cryptographic practice.
In some quick tests, cprng_fast() is about the same speed as
the old arc4randbytes(), and cprng_strong() is about 20% faster
than rnd_extract_data(). Performance is expected to improve.
The AES code in src/crypto/rijndael is no longer an optional
kernel component, as it is required by cprng_strong, which is
not an optional kernel component.
The entropy pool output is subjected to the rngtest tests at
startup time; if it fails, the system will reboot. There is
approximately a 3/10000 chance of a false positive from these
tests. Entropy pool _input_ from hardware random numbers is
subjected to the rngtest tests at attach time, as well as the
FIPS continuous-output test, to detect bad or stuck hardware
RNGs; if any are detected, they are detached, but the system
continues to run.
A problem with rndctl(8) is fixed -- datastructures with
pointers in arrays are no longer passed to userspace (this
was not a security problem, but rather a major issue for
compat32). A new kernel will require a new rndctl.
The sysctl kern.arandom() and kern.urandom() nodes are hooked
up to the new generators, but the /dev/*random pseudodevices
are not, yet.
Manual pages for the new kernel interfaces are forthcoming.
Diffstat (limited to 'sys/dev/mca')
| -rw-r--r-- | sys/dev/mca/edvar.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/dev/mca/edvar.h b/sys/dev/mca/edvar.h index 8cf6ef1fe0b..b7262dfb13f 100644 --- a/sys/dev/mca/edvar.h +++ b/sys/dev/mca/edvar.h @@ -1,4 +1,4 @@ -/* $NetBSD: edvar.h,v 1.13 2008/05/04 13:11:14 martin Exp $ */ +/* $NetBSD: edvar.h,v 1.14 2011/11/19 22:51:23 tls Exp $ */ /* * Copyright (c) 2001 The NetBSD Foundation, Inc. @@ -61,6 +61,6 @@ struct ed_softc { u_int32_t rba; /* # of RBAs */ #if NRND > 0 - rndsource_element_t rnd_source; + krndsource_t rnd_source; #endif }; |
