'\"
'\" Generated from file 'ripemd128\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2004, Pat Thoyts <patthoyts@users\&.sourceforge\&.net>
'\"
.TH "ripemd128" n 1\&.0\&.5 tcllib "RIPEMD Message-Digest Algorithm"
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.BS
.SH NAME
ripemd128 \- RIPEMD-128 Message-Digest Algorithm
.SH SYNOPSIS
package require \fBTcl  8\&.2\fR
.sp
package require \fBripemd128  ?1\&.0\&.5?\fR
.sp
\fB::ripemd::ripemd128\fR ?\fI-hex\fR? [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ]
.sp
\fB::ripemd::hmac128\fR ?\fI-hex\fR? \fI-key key\fR [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ]
.sp
\fB::ripemd::RIPEMD128Init\fR
.sp
\fB::ripemd::RIPEMD128Update\fR \fItoken\fR \fIdata\fR
.sp
\fB::ripemd::RIPEMD128Final\fR \fItoken\fR
.sp
\fB::ripemd::RIPEHMAC128Init\fR \fIkey\fR
.sp
\fB::ripemd::RIPEHMAC128Update\fR \fItoken\fR \fIdata\fR
.sp
\fB::ripemd::RIPEHMAC128Final\fR \fItoken\fR
.sp
.BE
.SH DESCRIPTION
.PP
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\&.
.PP
This package will use \fBTrf\fR to
accelerate the digest computation if available\&. In
the absence of an accelerator package the pure-Tcl implementation will
be used\&.
.SH COMMANDS
.TP
\fB::ripemd::ripemd128\fR ?\fI-hex\fR? [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ]
Calculate the RIPEMD-128 digest of the data given in string\&. This is
returned as a binary string by default\&. Giving the \fI-hex\fR option
will return a hexadecimal encoded version of the digest\&.
.sp
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
\fI-filename\fR argument is given then the file is opened, the data read
and hashed and the file is closed\&. If the \fI-channel\fR argument is
given then data is read from the channel until the end of file\&. The
channel is not closed\&.
.sp
Only one of \fI-file\fR, \fI-channel\fR or \fIstring\fR should be given\&.
.TP
\fB::ripemd::hmac128\fR ?\fI-hex\fR? \fI-key key\fR [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ]
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 \fI-key\fR are as for the \fB::ripemd::ripemd128\fR command\&.
.PP
.SH "PROGRAMMING INTERFACE"
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 \fBRIPEMD128Init\fR to obtain a token and then call
\fBRIPEMD128Update\fR as many times as required to add data to the hash\&. To
release any resources and obtain the hash value, you then call
\fBRIPEMD128Final\fR\&. An equivalent set of functions gives you a keyed
digest (HMAC)\&.
.PP
If you have \fBcritcl\fR and have built the \fBtcllibc\fR
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\&.
.TP
\fB::ripemd::RIPEMD128Init\fR
Begins a new RIPEMD-128 hash\&. Returns a token ID that must be used for the
remaining functions\&.
.TP
\fB::ripemd::RIPEMD128Update\fR \fItoken\fR \fIdata\fR
Add data to the hash identified by token\&. Calling
\fIRIPEMD128Update $token "abcd"\fR is equivalent to calling
\fIRIPEMD128Update $token "ab"\fR followed by
\fIRIPEMD128Update $token "cb"\fR\&. See \fBEXAMPLES\fR\&.
.TP
\fB::ripemd::RIPEMD128Final\fR \fItoken\fR
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\&.
.TP
\fB::ripemd::RIPEHMAC128Init\fR \fIkey\fR
This is equivalent to the \fB::ripemd::RIPEMD128Init\fR command
except that it requires the key that will be included in the HMAC\&.
.TP
\fB::ripemd::RIPEHMAC128Update\fR \fItoken\fR \fIdata\fR
.TP
\fB::ripemd::RIPEHMAC128Final\fR \fItoken\fR
These commands are identical to the RIPEMD128 equivalent commands\&.
.PP
.SH EXAMPLES
.CS


% ripemd::ripemd128 -hex "Tcl does RIPEMD-128"
3cab177bae65205d81e7978f63556c63

.CE
.CS


% ripemd::hmac128 -hex -key Sekret "Tcl does RIPEMD-128"
b359dc5971a05beea0be7b106b30e389

.CE
.CS


% 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

.CE
.SH REFERENCES
.IP [1]
H\&. Dobbertin, A\&. Bosselaers, B\&. Preneel,
"RIPEMD-160, a strengthened version of RIPEMD"
\fIhttp://www\&.esat\&.kuleuven\&.ac\&.be/~cosicart/pdf/AB-9601/AB-9601\&.pdf\fR
.IP [2]
Rivest, R\&., "The MD4 Message Digest Algorithm", RFC 1320, MIT,
April 1992\&. (\fIhttp://www\&.rfc-editor\&.org/rfc/rfc1320\&.txt\fR)
.IP [3]
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\&.
.IP [4]
Dobbertin, H\&., "Cryptanalysis of MD4", Journal of Cryptology
vol 11 (4), pp\&. 253-271 (1998)
.IP [5]
Rivest, R\&., "The MD5 Message-Digest Algorithm", RFC 1321, MIT and
RSA Data Security, Inc, April 1992\&.
(\fIhttp://www\&.rfc-editor\&.org/rfc/rfc1321\&.txt\fR)
.IP [6]
Krawczyk, H\&., Bellare, M\&. and Canetti, R\&. "HMAC: Keyed-Hashing for
Message Authentication", RFC 2104, February 1997\&.
(\fIhttp://www\&.rfc-editor\&.org/rfc/rfc2104\&.txt\fR)
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIripemd\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH "SEE ALSO"
md4, md5, ripemd160, sha1
.SH KEYWORDS
RIPEMD, hashing, md4, message-digest, rfc 1320, rfc 1321, rfc 2104, security
.SH CATEGORY
Hashes, checksums, and encryption
.SH COPYRIGHT
.nf
Copyright (c) 2004, Pat Thoyts <patthoyts@users\&.sourceforge\&.net>

.fi