1ripemd160(n) RIPEMD Message-Digest Algorithm ripemd160(n)
2______________________________________________________________________________
6
8 ripemd160 - RIPEMD-160 Message-Digest Algorithm
9
11 package require Tcl 8.2
12 package require ripemd160 ?1.0.5?
14 ::ripemd::ripemd160 ?-hex? [ -channel channel | -file filename | string
16 ]
17 ::ripemd::hmac160 ?-hex? -key key [ -channel channel | -file filename |
19 string ]
20 ::ripemd::RIPEMD160Init
22 ::ripemd::RIPEMD160Update token data
24 ::ripemd::RIPEMD160Final token
26 ::ripemd::RIPEHMAC160Init key
28 ::ripemd::RIPEHMAC160Update token data
30 ::ripemd::RIPEHMAC160Final token
32______________________________________________________________________________
34
36 This package is an implementation in Tcl of the RIPEMD-160 message-
37 digest algorithm (1). This algorithm takes an arbitrary quantity of
38 data and generates a 160-bit message digest from the input. The
39 RIPEMD-160 algorithm is based upon the MD4 algorithm (2, 4) but has
40 been cryptographically strengthened against weaknesses that have been
41 found in MD4 (4).
42 This package will use cryptkit or Trf to accelerate the digest computa‐
44 tion if either package is available. In the absence of an accelerator
45 package the pure-Tcl implementation will be used.
46
48 ::ripemd::ripemd160 ?-hex? [ -channel channel | -file filename | string
49 ]
50 Calculate the RIPEMD-160 digest of the data given in string.
51 This is returned as a binary string by default. Giving the -hex
52 option will return a hexadecimal encoded version of the digest.
53 The data to be hashed can be specified either as a string argu‐
55 ment to the ripemd160 command, or as a filename or a pre-opened
56 channel. If the -filename argument is given then the file is
57 opened, the data read and hashed and the file is closed. If the
58 -channel argument is given then data is read from the channel
59 until the end of file. The channel is not closed.
60 Only one of -file, -channel or string should be given.
62 ::ripemd::hmac160 ?-hex? -key key [ -channel channel | -file filename |
64 string ]
65 Calculate an Hashed Message Authentication digest (HMAC) using
66 the RIPEMD-160 digest algorithm. HMACs are described in RFC 2104
67 (5) and provide a RIPEMD-160 digest that includes a key. All
68 options other than -key are as for the ::ripemd::ripemd160 com‐
69 mand.
70
72 For the programmer, hash functions can be viewed as a bucket into which
73 one pours data. When you have finished, you extract a value that is
74 uniquely derived from the data that was poured into the bucket. The
75 programming interface to the hash operates on a token (equivalent to
76 the bucket). You call RIPEMD160Init to obtain a token and then call
77 RIPEMD160Update as many times as required to add data to the hash. To
78 release any resources and obtain the hash value, you then call
79 RIPEMD160Final. An equivalent set of functions gives you a keyed digest
80 (HMAC).
81 ::ripemd::RIPEMD160Init
83 Begins a new RIPEMD-160 hash. Returns a token ID that must be
84 used for the remaining functions.
85 ::ripemd::RIPEMD160Update token data
87 Add data to the hash identified by token. Calling
88 RIPEMD160Update $token "abcd" is equivalent to calling
89 RIPEMD160Update $token "ab" followed by RIPEMD160Update $token
90 "cb". See EXAMPLES.
91 ::ripemd::RIPEMD160Final token
93 Returns the hash value and releases any resources held by this
94 token. Once this command completes the token will be invalid.
95 The result is a binary string of 16 bytes representing the 160
96 bit RIPEMD-160 digest value.
97 ::ripemd::RIPEHMAC160Init key
99 This is equivalent to the ::ripemd::RIPEMD160Init command except
100 that it requires the key that will be included in the HMAC.
101 ::ripemd::RIPEHMAC160Update token data
103 ::ripemd::RIPEHMAC160Final token
105 These commands are identical to the RIPEMD160 equivalent com‐
106 mands.
107
109 % ripemd::ripemd160 -hex "Tcl does RIPEMD-160"
110 0829dea75a1a7074c702896723fe37763481a0a7
111 % ripemd::hmac160 -hex -key Sekret "Tcl does RIPEMD-160"
115 bf0c927231733686731dddb470b64a9c23f7f53b
116 % set tok [ripemd::RIPEMD160Init]
120 ::ripemd::1
121 % ripemd::RIPEMD160Update $tok "Tcl "
122 % ripemd::RIPEMD160Update $tok "does "
123 % ripemd::RIPEMD160Update $tok "RIPEMD-160"
124 % ripemd::Hex [ripemd::RIPEMD160Final $tok]
125 0829dea75a1a7074c702896723fe37763481a0a7
126
129 [1] H. Dobbertin, A. Bosselaers, B. Preneel, "RIPEMD-160, a
130 strengthened version of RIPEMD" http://www.esat.kuleu‐
131 ven.ac.be/~cosicart/pdf/AB-9601/AB-9601.pdf
132 [2] Rivest, R., "The MD4 Message Digest Algorithm", RFC 1320, MIT,
134 April 1992. (http://www.rfc-editor.org/rfc/rfc1320.txt)
135 [3] Rivest, R., "The MD4 message digest algorithm", in A.J. Menezes
137 and S.A. Vanstone, editors, Advances in Cryptology - CRYPTO '90
138 Proceedings, pages 303-311, Springer-Verlag, 1991.
139 [4] Dobbertin, H., "Cryptanalysis of MD4", Journal of Cryptology vol
141 11 (4), pp. 253-271 (1998)
142 [5] Krawczyk, H., Bellare, M. and Canetti, R. "HMAC: Keyed-Hashing
144 for Message Authentication", RFC 2104, February 1997.
145 (http://www.rfc-editor.org/rfc/rfc2104.txt)
146
148 This document, and the package it describes, will undoubtedly contain
149 bugs and other problems. Please report such in the category ripemd of
150 the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please
151 also report any ideas for enhancements you may have for either package
152 and/or documentation.
153 When proposing code changes, please provide unified diffs, i.e the out‐
155 put of diff -u.
156 Note further that attachments are strongly preferred over inlined
158 patches. Attachments can be made by going to the Edit form of the
159 ticket immediately after its creation, and then using the left-most
160 button in the secondary navigation bar.
161
163 md4, md5, ripemd128, sha1
164
166 RIPEMD, hashing, md4, message-digest, rfc 1320, rfc 1321, rfc 2104,
167 security
168
170 Hashes, checksums, and encryption
171
173 Copyright (c) 2004, Pat Thoyts <patthoyts@users.sourceforge.net>
174tcllib 1.0.5 ripemd160(n)