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cookfp - calculate file fingerprint


cookfp [ option... ][ filename... ]
cookfp -Help
cookfp -VERSion


The cookfp program is used to calculate the fingerprints of files. A fingerprint is a
hash of the contents of a file. The default fingerprint is cryptographically strong, so
the probability of two different files having the same fingerprint is less than 1 in

The fingerprint is based on Dan Berstien <djb@silverton.berkeley.edu> public domain
fingerprint 0.50 beta package 930809, posted to the alt.sources newsgroup. This program
produces identical results; the expected test results were generated using Dan's package.

The fingerprint is a base-64-sanely-encoded fingerprint of the input. Imagine this
fingerprint as something universal and permanent. A fingerprint is 76 characters long,
containing the following:

1. A Snefru-8 (version 2.5, 8 passes, 512->256) hash. (Derived from the Xerox Secure
Hash Function.)

2. An MD5 hash, as per RFC 1321. (Derived from the RSADSI MD5 Message-Digest Algorithm.)

3. A CRC checksum, as in the new cksum utility.

4. Length modulo 2^40.

The output format is not expected to be compatible with anything. However, options are
available to produce the purported output of Merkle's snefru program, the purported output
of RSADSI's mddriver -x, or the purported output of the POSIX cksum program.

If no files are named as input, the standard input will be used. The special file name
``-'' is understood to mean the standard input.


The following options are understood:

Print the CRC32 checksum and length of the named file(s).

Print a condensed form of the fingerprint (obtained by performing a CRC32 checksum
on the full fingerprint described above - a definite overkill). This is an
8-digit hexadecimal number, useful for generating unique short identifiers out of
long names. The first character is forced to be a letter (g-p), so there is no
problem in using the output as a variable name.

Provide some help with using the cookfp program.

Print the RSA Data Security, Inc. MD5 Message-Digest Algorithm hash of the named

-Snefru Print the Snefru hash of the named file(s), derived from the Xerox Secure Hash

Print the version of the cookfp program being executed.

All other options will produce a diagnostic error.

All options may be abbreviated; the abbreviation is documented as the upper case letters,
all lower case letters and underscores (_) are optional. You must use consecutive
sequences of optional letters.

All options are case insensitive, you may type them in upper case or lower case or a
combination of both, case is not important.

For example: the arguments "-help", "-HEL" and "-h" are all interpreted to mean the -Help
option. The argument "-hlp" will not be understood, because consecutive optional
characters were not supplied.

Options and other command line arguments may be mixed arbitrarily on the command line.

The GNU long option names are understood. Since all option names for cookfp are long,
this means ignoring the extra leading '-'. The "--option=value" convention is also


The cookfp command will exit with a status of 1 on any error. The cookfp command will
only exit with a status of 0 if there are no errors.


cookfp version 2.33
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Miller

The cookfp program comes with ABSOLUTELY NO WARRANTY; for details use the 'cookfp -VERSion
License' command. This is free software and you are welcome to redistribute it under
certain conditions; for details use the 'cookfp -VERSion License' command.

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