1md4(n) MD4 Message-Digest Algorithm md4(n)
2______________________________________________________________________________
6
8 md4 - MD4 Message-Digest Algorithm
9
11 package require Tcl 8.2
12 package require md4 ?1.0?
14 ::md4::md4 ?-hex? [ -channel channel | -file filename | string ]
16 ::md4::hmac ?-hex? -key key [ -channel channel | -file filename |
18 string ]
19 ::md4::MD4Init
21 ::md4::MD4Update token data
23 ::md4::MD4Final token
25 ::md4::HMACInit key
27 ::md4::HMACUpdate token data
29 ::md4::HMACFinal token
31_________________________________________________________________
33
35 This package is an implementation in Tcl of the MD4 message-digest
36 algorithm as described in RFC 1320 (1) and (2). This algorithm takes an
37 arbitrary quantity of data and generates a 128-bit message digest from
38 the input. The MD4 algorithm is faster but potentially weaker than the
39 related MD5 algorithm (3).
40 If you have critcl and have built the tcllibc package then the imple‐
42 mentation of the hashing function will be performed by compiled code.
43 Alternatively if cryptkit is available this will be used. If no accel‐
44 erator package can be found then the pure-tcl implementation is used.
45 The programming interface remains the same in all cases.
46
48 ::md4::md4 ?-hex? [ -channel channel | -file filename | string ]
49 Calculate the MD4 digest of the data given in string. This is
50 returned as a binary string by default. Giving the -hex option
51 will return a hexadecimal encoded version of the digest.
52 The data to be hashed can be specified either as a string argu‐
54 ment to the md4 command, or as a filename or a pre-opened chan‐
55 nel. If the -filename argument is given then the file is opened,
56 the data read and hashed and the file is closed. If the -channel
57 argument is given then data is read from the channel until the
58 end of file. The channel is not closed.
59 Only one of -file, -channel or string should be given.
61 ::md4::hmac ?-hex? -key key [ -channel channel | -file filename |
63 string ]
64 Calculate an Hashed Message Authentication digest (HMAC) using
65 the MD4 digest algorithm. HMACs are described in RFC 2104 (4)
66 and provide an MD4 digest that includes a key. All options other
67 than -key are as for the ::md4::md4 command.
68
70 For the programmer, the MD4 hash can be viewed as a bucket into which
71 one pours data. When you have finished, you extract a value that is
72 derived from the data that was poured into the bucket. The programming
73 interface to the MD4 hash operates on a token (equivalent to the
74 bucket). You call MD4Init to obtain a token and then call MD4Update as
75 many times as required to add data to the hash. To release any
76 resources and obtain the hash value, you then call MD4Final. An equiva‐
77 lent set of functions gives you a keyed digest (HMAC).
78 ::md4::MD4Init
80 Begins a new MD4 hash. Returns a token ID that must be used for
81 the remaining functions.
82 ::md4::MD4Update token data
84 Add data to the hash identified by token. Calling MD4Update
85 $token "abcd" is equivalent to calling MD4Update $token "ab"
86 followed by MD4Update $token "cb". See EXAMPLES.
87 ::md4::MD4Final token
89 Returns the hash value and releases any resources held by this
90 token. Once this command completes the token will be invalid.
91 The result is a binary string of 16 bytes representing the 128
92 bit MD4 digest value.
93 ::md4::HMACInit key
95 This is equivalent to the ::md4::MD4Init command except that it
96 requires the key that will be included in the HMAC.
97 ::md4::HMACUpdate token data
99 ::md4::HMACFinal token
101 These commands are identical to the MD4 equivalent commands.
102
104 % md4::md4 -hex "Tcl does MD4"
105 858da9b31f57648a032230447bd15f25
106 % md4::hmac -hex -key Sekret "Tcl does MD4"
109 c324088e5752872689caedf2a0464758
110 % set tok [md4::MD4Init]
113 ::md4::1
114 % md4::MD4Update $tok "Tcl "
115 % md4::MD4Update $tok "does "
116 % md4::MD4Update $tok "MD4"
117 % md4::Hex [md4::MD4Final $tok]
118 858da9b31f57648a032230447bd15f25
119
122 [1] Rivest, R., "The MD4 Message Digest Algorithm", RFC 1320, MIT,
123 April 1992. (http://www.rfc-editor.org/rfc/rfc1320.txt)
124 [2] Rivest, R., "The MD4 message digest algorithm", in A.J. Menezes
126 and S.A. Vanstone, editors, Advances in Cryptology - CRYPTO '90
127 Proceedings, pages 303-311, Springer-Verlag, 1991.
128 [3] Rivest, R., "The MD5 Message-Digest Algorithm", RFC 1321, MIT
130 and RSA Data Security, Inc, April 1992. (http://www.rfc-edi‐
131 tor.org/rfc/rfc1321.txt)
132 [4] Krawczyk, H., Bellare, M. and Canetti, R. "HMAC: Keyed-Hashing
134 for Message Authentication", RFC 2104, February 1997.
135 (http://www.rfc-editor.org/rfc/rfc2104.txt)
136
138 This document, and the package it describes, will undoubtedly contain
139 bugs and other problems. Please report such in the category md4 of the
140 Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].
141 Please also report any ideas for enhancements you may have for either
142 package and/or documentation.
143
145 md5, sha1
146
148 hashing, md4, message-digest, rfc 1320, rfc 1321, rfc 2104, security
149
151 Copyright (c) 2003, Pat Thoyts <patthoyts@users.sourceforge.net>
152md4 1.0.5 md4(n)