otp(n)                RFC 2289 A One-Time Password System               otp(n)



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NAME
       otp - One-Time Passwords

SYNOPSIS
       package require Tcl  8.2

       package require otp  ?1.0.0?

       ::otp::otp-md4 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-md5 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-sha1 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-rmd160 ?-hex? ?-words? -seed seed -count count data

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DESCRIPTION
       This package is an implementation in Tcl of the One-Time Password
       system as described in RFC 2289 (1). This system uses message-digest
       algorithms to sequentially hash a passphrase to create single-use
       passwords. The resulting data is then provided to the user as either
       hexadecimal digits or encoded using a dictionary of 2048 words. This
       system is used by OpenBSD for secure login and can be used as a SASL
       mechanism for authenticating users.

       In this implementation we provide support for four algorithms that are
       included in the tcllib distribution: MD5 (2), MD4 (3), RIPE-MD160 (4)
       and SHA-1 (5).

COMMANDS
       ::otp::otp-md4 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-md5 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-sha1 ?-hex? ?-words? -seed seed -count count data

       ::otp::otp-rmd160 ?-hex? ?-words? -seed seed -count count data

EXAMPLES
              % otp::otp-md5 -count 99 -seed host67821 "My Secret Pass Phrase"
              (binary gibberish)
              % otp::otp-md5 -words -count 99 -seed host67821 "My Secret Pass Phrase"
              SOON ARAB BURG LIMB FILE WAD
              % otp::otp-md5 -hex -count 99 -seed host67821 "My Secret Pass Phrase"
              e249b58257c80087


REFERENCES
       [1]    Haller, N. et al., "A One-Time Password System", RFC 2289,
              February 1998.  http://www.rfc-editor.org/rfc/rfc2289.txt

       [2]    Rivest, R., "The MD5 Message-Digest Algorithm", RFC 1321, MIT
              and RSA Data Security, Inc, April 1992.  (http://www.rfc-
              editor.org/rfc/rfc1321.txt)

       [3]    Rivest, R., "The MD4 Message Digest Algorithm", RFC 1320, MIT,
              April 1992. (http://www.rfc-editor.org/rfc/rfc1320.txt)

       [4]    H. Dobbertin, A. Bosselaers, B. Preneel, "RIPEMD-160, a
              strengthened version of RIPEMD"
              http://www.esat.kuleuven.ac.be/~cosicart/pdf/AB-9601/AB-9601.pdf

       [5]    "Secure Hash Standard", National Institute of Standards and
              Technology, U.S. Department Of Commerce, April 1995.
              (http://www.itl.nist.gov/fipspubs/fip180-1.htm)

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain
       bugs and other problems.  Please report such in the category otp of the
       Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].
       Please also report any ideas for enhancements you may have for either
       package and/or documentation.

SEE ALSO
       SASL, md4, md5, ripemd160, sha1

KEYWORDS
       hashing, message-digest, password, rfc 2289, security

CATEGORY
       Hashes, checksums, and encryption

COPYRIGHT
       Copyright (c) 2006, Pat Thoyts <patthoyts@users.sourceforge.net>




otp                                  1.0.0                              otp(n)
