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/usr/bin/tos-mote-key is in tinyos-tools 1.4.2-3.

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#!/usr/bin/perl

# Copyright (c) 2000-2002 The Regents of the University  of California.  
# All rights reserved.
#
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # - Redistributions of source code must retain the above copyright
 #   notice, this list of conditions and the following disclaimer.
 # - Redistributions in binary form must reproduce the above copyright
 #   notice, this list of conditions and the following disclaimer in the
 #   documentation and/or other materials provided with the
 #   distribution.
 # - Neither the name of the copyright holders nor the names of
 #   its contributors may be used to endorse or promote products derived
 #   from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 # FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 # THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 # OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Naveen Sastry
# Date:    11/11/02
#
#
# Script to manage the tinysec keyfile


# default keyfile and default key name (\w+ matches first valid key)
$KEYFILE=".keyfile";
$KEYNAME="\\w+";

# if no keyfile is found, we'll need to create it and populate it with data
# from /dev/random. This function returns the text taht should go into the 
# new keyfile. We store the key in a hex-form.
sub generateKey {
    print STDERR "Generating default TinySec Key...\n";
    
    $a = "\n# TinySec Keyfile. By default, the first key will be used.\n";
    $a = $a . "# You can import other keys by appending them to the file.\n";
    $a = $a . "\ndefault ";

    open RND, "</dev/urandom" or open "</dev/urandom" or 
        die("Couldn't open random file.");
    read RND, $r, 16;
    @chars = split //, $r;
    while (@chars) {
        $a = $a . sprintf("%02lX", (ord shift @chars));
    }
    return $a;
};

# Returns the binary version of the key (passed as the first arg)
sub recoverKey {
    $s = "";
    @chars = split /(..)/g, shift(@_);
    while (@chars) {
        $a = hex shift @chars;
        if ($a != 0 ) {
            $s = $s . chr ($a);
        }
    }
    return $s;
}

# Returns a text version of the key (passed as the key) suitable for use in c
# programs (ie returns "0x32,0xAB, ..." when given 32AB...)
sub splitKey {
    $s = "";
    $delim = "";
    @chars = split /(..)/g, shift(@_);
    while (@chars) {
        $a = shift @chars;
        if (! $a eq "" ) {
            $s = $s . $delim . "0x" . $a ;
            $delim = ",";
        }
    }
    return $s;
}

# prints the usage string and exits
sub usage {
    print "usage: TinySecKey [-kf keyfile] [-kn keyname]\n";
    print "       where \n";
    print "         [-kf keyfile] specifies an optional keyfile (default /home/$USER/.keyfile)\n";
    print "         [-kn keyname] specifies an optional keyname (default uses first) \n";
    exit 1;
}

# parse the args
while ($_ = $ARGV[0], /^-/) {
    shift;
    if (/^-kf/) { $KEYFILE = $ARGV[0]; shift; next;  }
    if (/^-kn/) { $KEYNAME = $ARGV[0] ; shift; next;  }
    usage();
}

# open the keyfile. if new, generate key data and reposition file pointer
open KEYFILE, '+<', $KEYFILE or
    (open KEYFILE, '+>', $KEYFILE and print KEYFILE generateKey() and
     seek KEYFILE, 0, 0) or
      die ("couldn't open file " . $KEYFILE);

# find the matching key and print.
while ( <KEYFILE> )  {
    if ($_ =~ /^$KEYNAME\s+([a-fA-F0-9]+)/) {
        $KEY = $1;
        last;
    }
}

print splitKey($KEY) . "\n";