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rsa_workbench/encode_pub.php

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rescued from ultra 10
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<html>
<body BGCOLOR="#00E0E0" link="#001fC0" vlink="#000080" text="#00000f">
<title> RSA Interactive Simulator : Encoding data with the public Key </title>
<h1> RSA Interactive Simulator / Work Bench : Encoding data with the public Key </h1>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php
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$c = $_POST['c'];
$e = $_POST['e'];
$d = $_POST['d'];
$p = $_POST['p'];
$n = $_POST['n'];
$q = $_POST['q'];
$phi = $_POST['phi'];
$mprivate = $_POST['mprivate'];
$m = $_POST['m'];
//printf("<h1> in encode_pup.php m is %s </h1>",$m);
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If ( $n < 1 || $e < 1 || $d < 1 ) {
printf("<h2> Error, you have got to this page without defining all of the RSA keys</h2>");
printf("<h2> You must go back and generate a full RSA key </h2>");
printf("<a href=\"generate_key.php\"><img src=\"create_rsa_key_set.png\" border=0></a>");
}
else {
?>
<h3> Here a user is encoding data to send to third party which
has published a public key. The user
takes the public key, and encodes the message. Only
the third party can decode the message, using its private key
</h3>
<p>
The encoding is simply performed by taking the number to be encrypted
to the power of e, and then applying the modulus for n (i.e. p times q).
</p>
<A name="KEYS">
<form enctype="multipart/form-data" method="post"
action="encode.php">
<strong>Encode Data using the following key set</strong>
<table border=2>
<tr>
<td>
<strong>Modulus (used by both public and private key) </strong>
</td>
<td>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<input type=text name="n" size=120 value='<?php echo $n ?>'>
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</td>
</tr>
<tr>
<td>
<strong> e - the public key </strong>
</td>
<td width>
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<input type=text name="e" size=120 value='<?php echo $e ?>'>
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</td>
</tr>
<tr>
<td>
<strong> m - the number to encrypt </strong>
</td>
<td width>
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<input type=text name="m" size=120 value='<?php echo $m ?>'>
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</td>
</tr>
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<input type="hidden" name=d value=<?php echo $d ?>>
<input type="hidden" name=p value=<?php echo $p ?>>
<input type="hidden" name=q value=<?php echo $q ?>>
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<input type="hidden" name=phi value=<? echo $phi ?>>
<tr><td><input type="submit" name="submit" value="Encode"> </td></tr>
</table>
</table>
</form>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php if ( $m ) { ?>
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<br> <br>
<hr>
<h2> DECODE : Decode with your secret key (n,d) </h2>
<A name="DECODE">
<hr>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php $digits = `./pow_digits $c $d ` ?>
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<p>
The decoding process calculates the value of c ^ d % n.
</p>
<p>
The value c ^ d <i> ( <? printf(" %s ^ %s ",$c,$d); ?> ) </i>
in this case
would produce a number with approx
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<b> <?php echo $digits ?> </b> decimal digits !
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</p>
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<?php $gt100k = `./gt100k $digits`;
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if ( $gt100k == 1 ) { ?>
<p>
Obviously this is unacceptable and would cause memory and processing time problems.
Mathematical techniques for algebraically breaking this problem into
smaller pieces, are described <a href="maths.html"> here </a>
</p>
<p> Note that for this very large value,
the bc script may take up to
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php $mins_est = (($digits/1000000) * ($digits/1000000)) * 1.5;
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printf("%2.2f",$mins_est); ?>
minutes to finish this calculation.
</P>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php } ?>
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<br>
<form enctype="multipart/form-data" method="post"
action="decode.php">
<strong>De-code Data using the key set</strong>
<p> Note that to encode with the private key, you may type a value in for 'c' and press decode. Cut and paste the 'in clear' value into the m of encode to verify correct reverse operation (de-coding with the private key ).
</p>
<p> The purpose of encoding with the private key is one of verifying identity (i.e. anyone can decode it using your published public key, but it is stamped with your RSA identity)</p>
<table border=2>
<tr>
<td>
<strong>Modulus (used by both public and private key) </strong>
</td>
<td>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<input type=text name="n" size=120 value="<?php echo $n ?>">
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</td>
</tr>
<tr>
<td>
<strong>d - the private key</strong>
</td>
<td>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<input type=text name="d" size=120 value="<?php echo $d ?>" >
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</td>
</tr>
<tr>
<td>
<strong> c - the number to de-crypt </strong>
</td>
<td width>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<input type=text name="c" size=120 value="<?php echo $c ?>">
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</td>
</tr>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
2016-01-26 10:27:43 +00:00
<input type="hidden" name=digits value=<?php echo $digits ?>
<input type="hidden" name=m value=<?php echo $m ?>>
<input type="hidden" name=e value=<?php echo $e ?>>
<input type="hidden" name=phi value=<?php echo $phi ?>>
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<tr><td><input type="submit" name="submit" value="Decode"> </td></tr>
</table>
</form>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php } // if to hide decode menu until a value has been coded
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?>
<form enctype="multipart/form-data" method="post"
action="generate_key.php">
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
2016-01-26 10:27:43 +00:00
<input type="hidden" name=digits value=<?php echo $digits ?>
<input type="hidden" name=m value=<?php echo $m ?>>
<input type="hidden" name=e value=<?php echo $e ?>>
<input type="hidden" name=n value=<?php echo $n ?>>
<input type="hidden" name=d value=<?php echo $d ?>>
<input type="hidden" name=phi value=<?php echo $phi ?>>
rescued from ultra 10
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<input type="submit" name="submit" value="Back to Generate Key">
</form>
updated for php5 and made it create a bc script for larger keys (rather thn make the web page wait for the long calculations).
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<?php } // all RSA key components defined
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?>
<center> <a href="index.php" border=0> <img src="home.png" border=0> </a> </center>
</body>
</html>
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