md4(n) MD4 Message-Digest Algorithm md4(n) 







md4 - MD4 Message-Digest Algorithm








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












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 implementation of the hashing function will be performed by
    compiled code. Alternatively if cryptkit is available this will be
    used. If no accelerator package can be found then the pure-tcl
    implementation is used. The programming interface remains the same in all
    cases.









  
::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
        argument to the md4 command, or as a filename or a pre-opened channel.
        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.










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 equivalent 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.










% 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










  
[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-editor.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)










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.








md5, sha1








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








Hashes, checksums, and encryption








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








  

    1.0.5
    md4