RDIGEST(1) BSD General Commands Manual RDIGEST(1)NAMErdigest — calculate message digests of files and directories
SYNOPSISrdigest [-x directory] algorithm [file ...]
DESCRIPTION
The rdigest utility calculates message digests of files, directories, or,
if no file is specified, standard input. The -x option can be used as
many times as required to indicate directories not to be included in a
directory's hash. This allows you to skip, eg, CVS subdirectories in a
given tree, which can have relatively volatile contents not pertinent to
the hash.
The list of possible algorithms is:
md5 the md5(3) algorithm will be used.
rmd160 the rmd160(3) algorithm will be used.
sha1 the sha1(3) algorithm will be used.
sha256 the sha256 algorithm will be used.
sha384 the sha384 algorithm will be used.
sha512 the sha512 algorithm will be used.
tiger the tiger algorithm will be used.
whirlpool
the whirlpool algorithm will be used.
The rdigest utility is a simple wrapper for the various different algo‐
rithm implementations, which are located in the standard C library, and
was designed to be scalable as new message digest algorithms are devel‐
oped. The checksum for a directory is implemented as the hash over a
list of one or two hashes for each of the items in the tree.
· For a file, the string “f ” along with the path make up the data for
one hash, and the contents of the file is used for the second hash.
· For a symbolic link, the string “l ” along with the path to the sym‐
bolic link make up the data for one hash, and the target of the sym‐
bolic link is used for the second hash.
· For a directory, the string “d ” along with the path make up the data
for one hash. There is no second hash for a directory.
The rdigest utility exits 0 on success, and >0 if an error occurs.
SEE ALSOcksum(1), digest(1), md5(3), rmd160(3), sha1(3)HISTORY
The rdigest utility first appeared in NetBSD 2.0.
AUTHORS
The digest(1) utility was written by Alistair G. Crooks <agc@netbsd.org>.
rdigest was implemented by Andrew Brown <atatat@netbsd.org> as a patch to
digest(1) to add recursive capabilities.
BSD March 31, 2005 BSD
