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Current File : /usr/share/doc/haveged/README.Debian
Debian specific notes regarding haveged
=======================================

Concerns regarding the RDTSC instructions in virtualized environments
---------------------------------------------------------------------

PolarSSL issued a security advisory on 2011-12-05 regarding their
implementation of the HAVEGE random generator and virtualized environment:
<https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2011-02>

When asked if the issue also applied to haveged, Gary Wuertz — haveged author —
replied:

First, there are significant differences between the polarssl and haveged
implementations of HAVEGE. In general, haveged works much harder to provoke
timing variations in the host (larger collection buffer, tuning collection code
and walk table to the host L1 caches). See comparison below.
I think items d) and e) in the comparison are items where polarssl is
particularly weak.

Second, since V1.5 haveged includes run time testing of haveged output. This is
the only definitive way to deal with a poor timing source (virtual or
otherwise). The test procedures are adapted from the German CC body, see:
http://www.issihosts.com/haveged/ais31.html

By default, AIS procedures A and B are run at start up and AIS procedure B is
run continuously by the daemon. Procedure A is intended to detect statistical
anomalies - it includes running the FIPS140-1 tests 257 times on successive
20,000 bit samples and an auto-correlation test. Procedure B runs a series of
bit distribution tests of a more theoretical nature, terminating with an
entropy estimate on a 256000+2560 bit sample using Coron's estimator.
Dispensing with procedure A during continuous tests is a performance
enhancement. haveged output gets mixed with other sources in /dev/random and as
long as haveged does not lie about the entropy it is feeding into the pool, all
should be fine.

AIS31 defines a retry strategy that a ideal generator should never fail, so any
haveged testing failure terminates output. Note that the test procedures
are not synchronized with collection but all haveged output is guaranteed to
come from a buffer not containing any failed individual test.

Comparison of the polarssl and haveged implementations of HAVEGE

a) Both use approximately the same collection code:

 * PolarSSL: havege.c inline macro
 * haveged: oniteration.h

b) Adaptation of collection code to host:

 * PolarSSL: static
   - collection buffer: 1024*sizeof(int),
   - walk table: 8192 * sizeof(int),
   - fill loop: 4 iterations
 * haveged: dynamic (built in tuning or invocation parameters)
   - collection buffer: 512*1024*sizeof(int32) (default, adjustable),
   - walk table: (4K *sizeof(int32)) + (2 * size of L1 data cache) ,
   - fill loop: number of iterations in that fit in a minimum of L1 instruction
                cache or 64K (approximately)

c) Timer source

 * PolarSSL: hardware cycle counter, gettimeofday() fallback
 * haveged: hardware cycle counter, clock_gettime() fallback

d) Collector warmup

 * PolarSSL: 1 fill
 * haveged: 32 fills plus self test

e) Run time testing

 * PolarSSL: none
 * haveged: Continuous and start-up AIS-31 tests (configurable)
N4m3
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