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md4(3tcl)		 MD4 Message-Digest Algorithm		     md4(3tcl)

______________________________________________________________________________

NAME
       md4 - MD4 Message-Digest Algorithm

SYNOPSIS
       package require Tcl  8.2

       package require md4  ?1.0?

       ::md4::md4 ?-hex? [ -channel channel | -file filename | string ]

       ::md4::hmac  ?-hex?  -key  key  [  -channel  channel | -file filename |
       string ]

       ::md4::MD4Init

       ::md4::MD4Update token data

       ::md4::MD4Final token

       ::md4::HMACInit key

       ::md4::HMACUpdate token data

       ::md4::HMACFinal token

_________________________________________________________________

DESCRIPTION
       This package is an implementation in  Tcl  of  the  MD4	message-digest
       algorithm as described in RFC 1320 (1) and (2). This algorithm takes an
       arbitrary quantity of data and generates a 128-bit message digest  from
       the  input. The MD4 algorithm is faster but potentially weaker than the
       related MD5 algorithm (3).

       If you have critcl and have built the tcllibc package then  the	imple‐
       mentation  of  the hashing function will be performed by compiled code.
       Alternatively if cryptkit is available this will be used. If no	accel‐
       erator  package	can be found then the pure-tcl implementation is used.
       The programming interface remains the same in all cases.

COMMANDS
       ::md4::md4 ?-hex? [ -channel channel | -file filename | string ]
	      Calculate the MD4 digest of the data given in  string.  This  is
	      returned	as  a binary string by default. Giving the -hex option
	      will return a hexadecimal encoded version of the digest.

	      The data to be hashed can be specified either as a string	 argu‐
	      ment  to the md4 command, or as a filename or a pre-opened chan‐
	      nel. If the -filename argument is given then the file is opened,
	      the data read and hashed and the file is closed. If the -channel
	      argument is given then data is read from the channel  until  the
	      end of file. The channel is not closed.

	      Only one of -file, -channel or string should be given.

       ::md4::hmac  ?-hex?  -key  key  [  -channel  channel | -file filename |
       string ]
	      Calculate an Hashed Message Authentication digest	 (HMAC)	 using
	      the  MD4	digest	algorithm. HMACs are described in RFC 2104 (4)
	      and provide an MD4 digest that includes a key. All options other
	      than -key are as for the ::md4::md4 command.

PROGRAMMING INTERFACE
       For  the	 programmer, the MD4 hash can be viewed as a bucket into which
       one pours data. When you have finished, you extract  a  value  that  is
       derived	from the data that was poured into the bucket. The programming
       interface to the MD4 hash  operates  on	a  token  (equivalent  to  the
       bucket).	 You call MD4Init to obtain a token and then call MD4Update as
       many times as required  to  add	data  to  the  hash.  To  release  any
       resources and obtain the hash value, you then call MD4Final. An equiva‐
       lent set of functions gives you a keyed digest (HMAC).

       ::md4::MD4Init
	      Begins a new MD4 hash. Returns a token ID that must be used  for
	      the remaining functions.

       ::md4::MD4Update token data
	      Add  data	 to  the  hash	identified by token. Calling MD4Update
	      $token "abcd" is equivalent to  calling  MD4Update  $token  "ab"
	      followed by MD4Update $token "cb". See EXAMPLES.

       ::md4::MD4Final token
	      Returns  the  hash value and releases any resources held by this
	      token. Once this command completes the token  will  be  invalid.
	      The  result  is a binary string of 16 bytes representing the 128
	      bit MD4 digest value.

       ::md4::HMACInit key
	      This is equivalent to the ::md4::MD4Init command except that  it
	      requires the key that will be included in the HMAC.

       ::md4::HMACUpdate token data

       ::md4::HMACFinal token
	      These commands are identical to the MD4 equivalent commands.

EXAMPLES
       % md4::md4 -hex "Tcl does MD4"
       858da9b31f57648a032230447bd15f25

       % md4::hmac -hex -key Sekret "Tcl does MD4"
       c324088e5752872689caedf2a0464758

       % set tok [md4::MD4Init]
       ::md4::1
       % md4::MD4Update $tok "Tcl "
       % md4::MD4Update $tok "does "
       % md4::MD4Update $tok "MD4"
       % md4::Hex [md4::MD4Final $tok]
       858da9b31f57648a032230447bd15f25

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

       [2]    Rivest, R., "The MD4 message digest algorithm", in A.J.  Menezes
	      and  S.A. Vanstone, editors, Advances in Cryptology - CRYPTO '90
	      Proceedings, pages 303-311, Springer-Verlag, 1991.

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

       [4]    Krawczyk, H., Bellare, M. and Canetti, R.	 "HMAC:	 Keyed-Hashing
	      for   Message   Authentication",	 RFC   2104,   February	 1997.
	      (http://www.rfc-editor.org/rfc/rfc2104.txt)

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will  undoubtedly  contain
       bugs and other problems.	 Please report such in the category md4 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
       md5, sha1

KEYWORDS
       hashing, md4, message-digest, rfc 1320, rfc 1321, rfc 2104, security

CATEGORY
       Hashes, checksums, and encryption

COPYRIGHT
       Copyright (c) 2003, Pat Thoyts <patthoyts@users.sourceforge.net>

md4				     1.0.5			     md4(3tcl)
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