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ActiveTcl User Guide
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ripemd128(n) 1.0.1 "ripemd128"
ripemd128 - RIPEMD-128 Message-Digest Algorithm
TABLE OF
CONTENTS
SYNOPSIS
DESCRIPTION
COMMANDS
PROGRAMMING
INTERFACE
EXAMPLES
REFERENCES
SEE ALSO
KEYWORDS
COPYRIGHT
package require Tcl 8.2
package require ripemd128 ?1.0.1?
This package is an implementation in Tcl of the RIPEMD-128
message-digest algorithm (1). This algorithm takes an arbitrary
quantity of data and generates a 128-bit message digest from the
input. The RIPEMD-128 algorithm is based upon the MD4 algorithm (2,
4) but has been cryptographically strengthened against weaknesses
that have been found in MD4 (4). RIPEMD-128 has been designed to be
a drop-in replacement for MD4 and MD5 (5). If security is the major
consideration, then RIPEMD-160 or SHA1 should be considered.
- ::ripemd::ripemd128 ?-hex? [ -channel channel | -file filename | string ]
- Calculate the RIPEMD-128 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 ripemd128 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.
- ::ripemd::hmac128 ?-hex? -key key [ -channel channel | -file filename | string ]
- Calculate an Hashed Message Authentication digest (HMAC) using
the RIPEMD-128 digest algorithm. HMACs are described in RFC 2104
(6) and provide a RIPEMD-128 digest that includes a key. All
options other than -key are as for the ::ripemd::ripemd128 command.
For the programmer, hash functions can be viewed as a bucket
into which one pours data. When you have finished, you extract a
value that is uniquely derived from the data that was poured into
the bucket. The programming interface to the hash operates on a
token (equivalent to the bucket). You call RIPEMD128Init to obtain a token and then call RIPEMD128Update as many times as required to add data to
the hash. To release any resources and obtain the hash value, you
then call RIPEMD128Final. An equivalent set of
functions gives you a keyed digest (HMAC).
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 both the Trf and Memchan extensions are available then these
will be used. Finally the package will revert to a pure-Tcl
implementation. The programming interface remains the same,
however.
- ::ripemd::RIPEMD128Init
- Begins a new RIPEMD-128 hash. Returns a token ID that must be
used for the remaining functions.
- ::ripemd::RIPEMD128Update token data
- Add data to the hash identified by token. Calling
RIPEMD128Update $token "abcd" is equivalent to calling
RIPEMD128Update $token "ab" followed by
RIPEMD128Update $token "cb". See EXAMPLES.
- ::ripemd::RIPEMD128Final 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
RIPEMD-128 digest value.
- ::ripemd::RIPEHMAC128Init key
- This is equivalent to the ::ripemd::RIPEMD128Init command except that it requires
the key that will be included in the HMAC.
- ::ripemd::RIPEHMAC128Update token data
- ::ripemd::RIPEHMAC128Final token
- These commands are identical to the RIPEMD128 equivalent
commands.
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% ripemd::ripemd128 -hex "Tcl does RIPEMD-128"
3CAB177BAE65205D81E7978F63556C63
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% ripemd::hmac128 -hex -key Sekret "Tcl does RIPEMD-128"
B359DC5971A05BEEA0BE7B106B30E389
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% set tok [ripemd::RIPEMD128Init]
::ripemd::1
% ripemd::RIPEMD128Update $tok "Tcl "
% ripemd::RIPEMD128Update $tok "does "
% ripemd::RIPEMD128Update $tok "RIPEMD-128"
% ripemd::Hex [ripemd::RIPEMD128Final $tok]
3CAB177BAE65205D81E7978F63556C63
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- 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
- Rivest, R., "The MD4 Message Digest Algorithm", RFC 1320, MIT,
April 1992. (http://www.rfc-editor.org/rfc/rfc1320.txt)
- 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.
- Dobbertin, H., "Cryptanalysis of MD4", Journal of Cryptology
vol 11 (4), pp. 253-271 (1998)
- 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)
- 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)
md4 , md5 , ripemd160
, sha1
RIPEMD , hashing , md4 , message-digest , rfc 1320 , rfc 1321 , rfc 2104 , security
Copyright © 2004, Pat Thoyts
<patthoyts@users.sourceforge.net>