'\"
'\" Generated from file 'md5crypt\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2003, Pat Thoyts <patthoyts@users\&.sourceforge\&.net>
'\"
.TH "md5crypt" n 1\&.2\&.0 tcllib "MD5-based password encryption"
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.SH NAME
md5crypt \- MD5-based password encryption
.SH SYNOPSIS
package require \fBTcl 8\&.5 9\fR
.sp
package require \fBmd5 2\&.0\fR
.sp
package require \fBmd5crypt ?1\&.2\&.0?\fR
.sp
\fB::md5crypt::md5crypt\fR \fIpassword\fR \fIsalt\fR
.sp
\fB::md5crypt::aprcrypt\fR \fIpassword\fR \fIsalt\fR
.sp
\fB::md5crypt::salt\fR ?\fIlength\fR?
.sp
.BE
.SH DESCRIPTION
.PP
This package provides an implementation of the MD5-crypt password
encryption algorithm as pioneered by FreeBSD and currently in use as a
replacement for the unix crypt(3) function in many modern
systems\&. An implementation of the closely related Apache MD5-crypt is
also available\&.
The output of these commands are compatible with the BSD and OpenSSL
implementation of md5crypt and the Apache 2 htpasswd program\&.
.SH COMMANDS
.TP
\fB::md5crypt::md5crypt\fR \fIpassword\fR \fIsalt\fR
Generate a BSD compatible md5-encoded password hash from the plaintext
password and a random salt (see SALT)\&.
.TP
\fB::md5crypt::aprcrypt\fR \fIpassword\fR \fIsalt\fR
Generate an Apache compatible md5-encoded password hash from the plaintext
password and a random salt (see SALT)\&.
.TP
\fB::md5crypt::salt\fR ?\fIlength\fR?
Generate a random salt string suitable for use with the \fBmd5crypt\fR and
\fBaprcrypt\fR commands\&.
.PP
.SH SALT
The salt passed to either of the encryption schemes implemented here
is checked to see if it begins with the encryption scheme magic string
(either "$1$" for MD5-crypt or "$apr1$" for Apache crypt)\&. If so, this
is removed\&. The remaining characters up to the next $ and up to a
maximum of 8 characters are then used as the salt\&. The salt text
should probably be restricted to the set of ASCII alphanumeric characters
plus "\&./" (dot and forward-slash) - this is to preserve maximum
compatibility with the unix password file format\&.
.PP
If a password is being generated rather than checked from a password
file then the \fBsalt\fR command may be used to generate a random salt\&.
.SH EXAMPLES
.CS


% md5crypt::md5crypt password 01234567
$1$01234567$b5lh2mHyD2PdJjFfALlEz1

.CE
.CS


% md5crypt::aprcrypt password 01234567
$apr1$01234567$IXBaQywhAhc0d75ZbaSDp/

.CE
.CS


% md5crypt::md5crypt password [md5crypt::salt]
$1$dFmvyRmO$T\&.V3OmzqeEf3hqJp2WFcb\&.

.CE
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fImd5crypt\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"
md5
.SH KEYWORDS
hashing, md5, md5crypt, message-digest, security
.SH CATEGORY
Hashes, checksums, and encryption
.SH COPYRIGHT
.nf
Copyright (c) 2003, Pat Thoyts <patthoyts@users\&.sourceforge\&.net>

.fi
