Module Name: othersrc
Committed By: agc
Date: Sun Sep 18 19:01:16 UTC 2011
Modified Files:
othersrc/external/bsd/threshold/dist/src/threshold: threshold.1
Log Message:
sync manual page with reality
To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 \
othersrc/external/bsd/threshold/dist/src/threshold/threshold.1
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: othersrc/external/bsd/threshold/dist/src/threshold/threshold.1
diff -u othersrc/external/bsd/threshold/dist/src/threshold/threshold.1:1.2 othersrc/external/bsd/threshold/dist/src/threshold/threshold.1:1.3
--- othersrc/external/bsd/threshold/dist/src/threshold/threshold.1:1.2 Sat Mar 12 13:22:24 2011
+++ othersrc/external/bsd/threshold/dist/src/threshold/threshold.1 Sun Sep 18 19:01:16 2011
@@ -1,4 +1,4 @@
-.\" $NetBSD: threshold.1,v 1.2 2011/03/12 13:22:24 wiz Exp $
+.\" $NetBSD: threshold.1,v 1.3 2011/09/18 19:01:16 agc Exp $
.\"
.\" Copyright (c) 2010 Alistair Crooks <[email protected]>
.\" All rights reserved.
@@ -23,7 +23,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd April 13, 2010
+.Dd September 18, 2011
.Dt THRESHOLD 1
.Os
.Sh NAME
@@ -35,8 +35,7 @@
.Op Fl a algorithm
.Op Fl m memory-size
.Op Fl o filename
-.Op Fl s total-shares|threshold/shares
-.Op Fl t threshold-shares|threshold/shares
+.Op Fl t threshold/shares
.Ar file
.Sh DESCRIPTION
The
@@ -60,8 +59,17 @@
.Bl -tag -width Ar
.It Fl a
Specify the algorithm to be used in the threshold scheme.
-The default algorithm is
-.Dq ssss .
+The possible algorithms are
+.Dq ida
+for Rabin's IDA (this is the default),
+.Dq RAID4
+and
+.Dq RAID5
+while the
+.Xr ssss 1
+command also uses the
+.Xr libthreshold 3
+framework.
.It Fl i
Operate in an interactive manner by prompting the user for a secret
to be typed in response to a prompt, and read by
@@ -113,26 +121,78 @@
.Dv secretfile
into 10 separate shares, of which 3 are needed to reconstruct the original file.
.Bd -literal
-% threshold -a s4 -t 3/5 secretfile
-Splitting file secretfile to:
-secretfile.001 secretfile.002 secretfile.003 secretfile.004 secretfile.005
-% ls -al secretfile.0*
--rw-r--r-- 1 agc agc 21327 May 2 21:44 secretfile.001
--rw-r--r-- 1 agc agc 21327 May 2 21:44 secretfile.002
--rw-r--r-- 1 agc agc 21327 May 2 21:44 secretfile.003
--rw-r--r-- 1 agc agc 21327 May 2 21:44 secretfile.004
--rw-r--r-- 1 agc agc 21327 May 2 21:44 secretfile.005
-% threshold -j -o secretfile.out secretfile.003 secretfile.001 secretfile.002
-Creating file secretfile.out from files:
-% diff secretfile secretfile.out
+% cp /etc/group origfile
+% threshold -t 3/10 origfile
+% ls -al /etc/group origfile.split*
+-rw-r--r-- 1 root wheel 526 Jun 26 01:34 /etc/group
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split0
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split1
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split2
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split3
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split4
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split5
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split6
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split7
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split8
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 origfile.split9
+% threshold -j -o origfile.recons origfile.split4 origfile.split2 origfile.split3
+% diff origfile origfile.recons
+% rm origfile.*
%
.Ed
+.Pp
+The following example uses shell redirection to split the
+data on standard input:
+.Bd -literal
+% threshold -t 3/10 < origfile
+% ls -al threshold.split*
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split0
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split1
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split2
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split3
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split4
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split5
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split6
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split7
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split8
+-rw-r--r-- 1 agc agc 192 Sep 17 13:59 threshold.split9
+% threshold -j -o origfile.mem threshold.split1 threshold.split2 threshold.split3
+% diff origfile origfile.mem
+% rm threshold.*
+.Ed
+.Pp
+The following example prompts for input using
+.Xr getpass 3
+.Bd -literal
+% threshold -t 3/10 -i
+Data to share:
+% ls -al threshold.split*
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split0
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split1
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split2
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split3
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split4
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split5
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split6
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split7
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split8
+-rw-r--r-- 1 agc agc 20 Sep 17 13:59 threshold.split9
+% threshold -j threshold.split4 threshold.split2 threshold.split3
+hello world
+%
+.Ed
+.Pp
+Rabin's IDA creates shares which are a fraction of the original size.
+The exact size of each share is a function of the number of shares defined
+as necessary to recreate the original data, and the size of the original data
+itself.
.Sh RETURN VALUES
The
.Nm
utility will return 0 for success,
and 1 for failure.
.Sh SEE ALSO
+.Xr ssss 1 ,
.Xr getpass 3 ,
.Xr libthreshold 3
.Sh HISTORY
@@ -142,9 +202,6 @@
.Nx 6.0 .
.Sh AUTHORS
.An -nosplit
-.An Hal Finney wrote the original
-.Dq secsplit
-Shamir Secret Sharing Scheme functionality.
The Information Dispersal Algorithm implementation was written by
.An Alistair Crooks Aq [email protected]
and ended up being influenced by a number of sources.
