tthsum man page on DragonFly
[printable version]
TTHSUM(1) User Commands TTHSUM(1)
NAME
tthsum ‐ generates or checks TTH message digests
SYNOPSIS
tthsum [-bhmpvVw] [-c [file]] | [file...]
DESCRIPTION
tthsum generates or checks TTH checksums (roots of the Tiger/THEX hash
tree). The Merkle Hash Tree, invented by Ralph Merkle, is a hash con‐
struct that exhibits desirable properties for verifying the integrity
of files and file subranges in an incremental or out‐of‐order fashion.
tthsum uses the Tiger hash algorithm, by Ross Anderson and Eli Biham,
for both the internal and the leaf nodes.
The specification of the THEX algorithm is at:
. http://tthsum.devs.nu/draft-jchapweske-thex-02.html
The specification of the Tiger hash algorithm is at:
. http://www.cs.technion.ac.il/~biham/Reports/Tiger/
Normally tthsum generates checksums of all files given to it as parame‐
ters and prints the checksums followed by the filenames. If, however,
-c is specified, only one filename parameter is allowed. This file
should contain checksums and filenames to which these checksums refer,
and the files listed in that file are checked against the checksums
listed there. See option -c for more information.
If no file is specified data will be read from standard input.
OPTIONS
-b An md5sum compatibility option. It does absolutely nothing.
(md5sum uses -b to treat binary files differently from texts
files.)
-c Check tthsum of all files listed in file against the checksum
listed in the same file. The actual format of that file is the
same as output of tthsum. That is, each line in the file
describes a file. A line looks like:
<TTH CHECKSUM> <FILENAME>
So, for example, if a file were created and its message digest
calculated like so:
echo foo > tth-test-file; tthsum tth-test-file
tthsum would report:
A2MPPCGS5CPJV6AOAP37ICDCFV3WYU7PBREC6FY tth-test-file
See NOTES for more information on the digest file format.
-m Use mmap(2) instead of read(2) to read the contents of the files
to hash. Normally, using read is cheaper. This all depends on
system load, I/O speed, CPU speed, L1 and/or L2 cache size and
whatnot.
-p Show the progress. Print the percentage of completeness while
hashing on standard error. Prints file position instead of per‐
centage when the file size is unknown.
-v Be verbose. Print filenames when checking (with -c).
-w Warn on improperly formatted lines when checking (with -c).
-h, -V Print a small help text or the version, respectively, on stan‐
dard out. If an unknown combination of options is encountered,
the small help is printed on standard error and tthsum will
return non‐zero.
RETURN VALUE
tthsum returns 0 if no error occurred or, when checking a digest, if at
least one line is formatted properly and the TTHs of all properly for‐
matted lines match. tthsum returns 2 if an unknown combination of
options is encountered. In all other cases will tthsum return 1.
NOTES
tthsum intentionally uses an interface identical to md5sum.
tthsum uses BASE32 encoding consisting of the following characters:
ABCDEFGHIJKLMNOPQRSTUVWXYZ234567. It will accept lower case letters in
the digest input as well.
tthsum does not accept long options such as --help.
A digest file format line looks like: <BASE32><SPACES><FILENAME><EOL>.
BASE32 is a 39 character long BASE32 encoded string. SPACES is a set
of two spaces (0x20). FILENAME is the name of the file, encoded in
UTF8 and with all control characters (those below 0x20) encoded as \xNN
or \C C‐style escapes. (The backslash is escaped as \\ as well. On Win‐
dows, backslashes in paths will be translated to slashes for compati‐
bility with real operating systems.) EOL may be CRLF (\r\n), just
plain LF (\n) or even nothing at end‐of‐file.
If you see warnings about an improper locale setup, check your LANG
and/or LC_CTYPE environment variables. If these are not set properly,
tthsum cannot represent non‐ASCII characters (those above 0x7F) in
UTF8. See locale(1) for more information or try to set LC_CTYPE to e.g.
"en_US".
REPORTING BUGS
Report bugs to <walter+tthsum@wjd.nu>.
COPYRIGHT
Copyright © 2009 Walter Doekes. License GPLv3+: GNU GPL version 3 or
later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
AUTHOR
tthsum and this manpage were written by Walter Doekes (walter+tth‐
sum@wjd.nu). The hashing code was copied directly from DC++, an open
source peer‐to‐peer file sharing program by Jacek Sieka (jacek@cre‐
atio.se) who had based the hashing code on the one used in BCDC++ (a
modified DC++) by Dustin Brody (blackclaw@parsoma.net). After version
1.1.0, the hashing code from the Tiger hash authors is used instead, to
support big endian architectures and to remove the need for C++ compil‐
ers and libraries. The md5sum manpage, written by Juho Vuori
(javuori@cc.helsinki.fi), was used as a template. This manpage was
proofread by Dustin Brody.
SEE ALSO
cksfv(1), md5sum(1), sha1sum(1)
tthsum version 1.3.2 Dec 2009 TTHSUM(1)
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