HASHDEEP(1)                 United States Air Force                HASHDEEP(1)



NAME
       hashdeep - Compute, compare, or audit multiple message digests


SYNOPSIS
       hashdeep -V | -h
       hashdeep  [-c  <alg1>[,<alg2>]]  [-k <file>] [-i <size>] [-o <fbcplsd>]
       [-amxwMXrespblvv] [FILES]



DESCRIPTION
       Computes multiple hashes, or message digests, for any number  of  files
       while  optionally  recursively digging through the directory structure.
       By default the program computes MD5 and SHA-256 hashes,  equivalent  to
       -c  md5,sha256.   Can  also take a list of known hashes and display the
       filenames of input files whose hashes either do or do not match any  of
       the  known  hashes.  Can also use a list of known hashes to audit a set
       of FILES.  Errors are reported to standard error. If no FILES are spec-
       ified, reads from standard input.




       -c <alg1>[,<alg2>...]
              Computation  mode.  Compute hashes of FILES using the algorithms
              specified. Legal  values  are  md5,  sha1,  sha256,  tiger,  and
              whirlpool.



       -k     Load  a  file of known hashes.  This flag is required when using
              any of the matching or audit modes (i.e. -m, -x, -M, -X, or  -a)
              This  flag  may  be  used more than once to add multiple sets of
              known hashes.

              Loading sets with different hash algorithms can sometimes gener-
              ate  spurrious  hash  collisions. For example, let's say we have
              two hash sets, A and B, which have some overlapping  files.  For
              example,  the  file  /usr/bin/bad  is  in  both sets. In A we've
              recorded the MD5 and SHA-256.  In  B  we've  recorded  the  MD5,
              SHA-1,  and  SHA-256.  Because  these two records are different,
              they will both be loaded. When the program  computes  all  three
              hashes  and  compares  them to the set of knowns, we will get an
              exact match from the record in B and a collision from the record
              in A.



       -a     Audit  mode.  Each  input  file  is  compared against the set of
              knowns.  An audit is said to pass if each input file is  matched
              against  exactly  one file in set of knowns. Any collisions, new
              files, or missing files will make the  audit  fail.  Using  this
              flag  alone  produces a message, either "Audit passed" or "Audit
              Failed". Use the verbose modes, -v, for more details.  Using  -v
              prints  the  number of files in each category. Using -v a second
              time prints any discrepancies. Using -v a third time prints  the
              results for every file examined and every known file.
              Due  to  limitations  in the program, any filenames with Unicode
              characters will appear to have moved during an  audit.  See  the
              section "UNICODE SUPPORT" below.


       -m     Positive  matching,  requires  at  least one use of the -k flag.
              The input files are examined one at a time, and only those files
              that match the list of known hashes are output. The only accept-
              able format for known hashes is the output of previous  hashdeep
              runs.
               If standard input is used with the -m flag, displays "stdin" if
              the input matches one of the hashes in the list of known hashes.
              If the hash does not match, the program displays no output.
               This flag may not be used in conjunction with the -x, -X, or -a
              flags.  See the section "UNICODE SUPPORT" below.


       -x     Negative matching.  Same as the -m flag above, but does negative
              matching.  That  is,  only  those files NOT in the list of known
              hashes are displayed.
               This flag may not be used in conjunction with the -m, -M, or -a
              flags.  See the section "UNICODE SUPPORT" below.


       -w     When  used  with  positive  matching  modes (-m,-M) displays the
              filename of the known hash that matched the input file.  See the
              section "UNICODE SUPPORT" below.


       -M and -X
              Same  as  -m  and  -x above, but displays the hash for each file
              that does (or does not) match the list of known hashes.



       -r     Enables recursive mode. All subdirectories are traversed. Please
              note  that recursive mode cannot be used to examine all files of
              a given file extension. For example, calling hashdeep  -r  *.txt
              will examine all files in directories that end in .txt.



       -e     Displays a progress indicator and estimate of time remaining for
              each file being processed. Time estimates for files larger  than
              4GB are not available on Windows. This mode may not be used with
              th -p mode.



       -i <size>
              Size threshold mode. Only hash files smaller than the given  the
              threshold.   Sizes   may  be  specified  using  IEC  multipliers
              b,k,m,g,t,p, and e.



       -o <bcpflsd>
              Enables expert mode. Allows the user  specify  which  (and  only
              which)  types  of  files  are processed. Directory processing is
              still controlled with the  -r  flag.  The  expert  mode  options
              allowed are:
              f - Regular files
              b - Block Devices
              c - Character Devices
              p - Named Pipes
              l - Symbolic Links
              s - Sockets
              d - Solaris Doors



       -s     Enables silent mode. All error messages are supressed.



       -p     Piecewise  mode. Breaks files into chunks before hashing. Chunks
              may be specified  using  IEC  multipliers  b,k,m,g,t,p,  and  e.
              (Never let it be said that the author didnat plan ahead.)



       -b     Enables bare mode. Strips any leading directory information from
              displayed filenames.  This flag may not be used  in  conjunction
              with the -l flag.


       -l     Enables  relative  file  paths. Instead of printing the absolute
              path for each file, displays the relative file path as indicated
              on  the  command  line. This flag may not be used in conjunction
              with the -b flag.


       -v     Enables verbose mode. Use again to make the  program  more  ver-
              bose.  This mostly changes the behvaior of the audit mode, -a.


       -h     Show a help screen and exit.


       -V     Show the version number and exit.




UNICODE SUPPORT
       As  of  version  2.0  the  program can process input files with Unicode
       characters in their filenames on Windows  systems.   In  the  program's
       output,  however, each Unicode character is represented with a question
       mark (?).  Note that Unicode characters are not supported in the  files
       containing  known  hashes.  You can specify a file of known hashes that
       has Unicode characters in its name by  using  tab  completition  or  an
       asterisk  (e.g.  hashdeep -mk *.txt where there is only one file with a
       .txt extension).


RETURN VALUE
       Returns zero on success, one on error.


AUTHOR
       hashdeep was written by Jesse Kornblum, research@jessekornblum.com.


KNOWN ISSUES
       Using the -r flag cannot be used to recursively process all files of  a
       given  extension  in a directory. This is a feature, not a bug.  If you
       need to do this, use the find(1) command.

       The program will fail if you attempt to  compare  2^64  or  more  input
       files against a set of known files.



REPORTING BUGS
       We  take  all  bug reports very seriously. Any bug that jeopardizes the
       forensic integrity of this program could have serious  consequenses  on
       people's lives. When submitting a bug report, please include a descrip-
       tion of the problem, how you found it, and your contact information.

       Send bug reports to the author at the address above.


COPYRIGHT
       This program is a work of the US Government. In accordance with 17  USC
       105,  copyright protection is not available for any work of the US Gov-
       ernment.  This program is PUBLIC DOMAIN. Portions of this program  con-
       tain  code  that  is  licensed  under  the  terms of the General Public
       License (GPL).  Those portions  retain  their  original  copyright  and
       license. See the file COPYING for more details.

       There  is NO warranty for this program; not even for MERCHANTABILITY or
       FITNESS FOR A PARTICULAR PURPOSE.


SEE ALSO
       More information and installation instructions  can  be  found  in  the
       README  file.  Current  versions  of both documents can be found on the
       project homepage: http://md5deep.sourceforge.net/

       The MD5 specification, RFC 1321, is available at
       http://www.ietf.org/rfc/rfc1321.txt

       The SHA-1 specification, RFC 3174, is available at
       http://www.faqs.org/rfcs/rfc3174.html

       The SHA-256 specification, FIPS 180-2, is available at
       http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf

       The Tiger specification is available at
       http://www.cs.technion.ac.il/~biham/Reports/Tiger/

       The Whirlpool specification is available at
       http://planeta.terra.com.br/informatica/paulobarreto/WhirlpoolPage.html



AFOSI                        v3.9.2 - 26 Jul 2011                  HASHDEEP(1)
