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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> SigWrite </title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="canonical" href="index.html">
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<body>
<div>
<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../../index.html">minivmac</a>/<a href="../index.html">extras</a>/sigwrite
- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
</div>
<hr>
<h2 align=center>
SigWrite
</h2>
<hr>
<p> Download </p>
<blockquote>
<p> <a href="https://www.gryphel.com/d/minivmac/extras/sigwrite/sigwrite-1.2.0.zip">sigwrite-1.2.0.zip</a>
(111K) a zipped hfs disk image and checksum file.
The disk image can be mounted with Mini vMac.
Includes source code.
</p>
</blockquote>
<p>
SigWrite is a tool for creating digital signatures that can be checked
with the
<a href="../sigcheck/index.html">SigCheck</a>
tool. Public and secret
key pairs for these tools can be created with
<a href="../makekeys/index.html">MakeKeys</a>.
</p>
<p> <img src="https://www.gryphel.com/d/minivmac/extras/sigwrite/screen.gif" width=514 height=344 border=0 alt="Screenshot"> </p>
<p> To use SigWrite, launch the application, and in the editing window
that appears, paste in a message to be signed. For example: </p>
<blockquote>
<pre>
Twas brillig, and the slithy toves
did gyre and gimble in the wabe:
All mimsy were the borogoves,
and the mome raths outgrabe.
</pre>
</blockquote>
<p>
Copy all of the indented text above. Then paste it into SigWrite,
which requires getting the clipboard into the emulated Macintosh, if
SigWrite is run inside Mini vMac. You can get
text into the emulated Macintosh using the “Host Paste”
command in the Edit Menu of SigWrite. It is like the “Paste” command,
except that it uses the clipboard of the real computer instead
of the clipboard of the emulated computer. The keyboard shortcut
is Command-Option-V. (The “Host Paste” command has
similar effect to using
<a href="../clipin/index.html">ClipIn</a>
and then the normal “Paste” command.)
</p>
<p> Then click on the status bar, at the bottom
of the window below the editing area.
(Choosing the ‘Go’ command from the File menu,
of the emulated Macintosh, will also work. The keyboard shortcut
is Command-G.) </p>
<p>
The editing area is cleared. Next paste in a secret key
to sign the message with. (One can be created with
<a href="../makekeys/index.html">MakeKeys</a>).
For example (and only as example,
normally a secret key should never be given to anyone
else):
</p>
<blockquote>
<pre>
----- BEGIN GRY SECRET KEY -----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------ END GRY SECRET KEY ------
</pre>
</blockquote>
<p>
Before continuing, it would be a good idea to set Mini vMac to
<a href="../../hardware.html#processor">All Out speed</a>.
Then, on a modern computer, SigWrite should
take less than ten seconds to run (for a 1024 bit key, as
in this example).
At 1x speed, or on a real Macintosh Plus, it takes much longer.
The code of SigWrite is intended to be simple
to understand and maintain, as opposed to fast.
</p>
<p>
Again, click on the status bar. After a while, if
all is well, the edit area is replaced with the signed text:
</p>
<blockquote>
<pre>
--------- GRY SIGNED TEXT ---------
Twas brillig, and the slithy toves
did gyre and gimble in th
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