Code Snippet (Syntax highlighted) - Toggle Wrap

<form action="Crypt.php" method="post">
<table cellspacing='20'>
<tr>
<td style='vertical-align:top;'>
<h2>Hash</h2>
Text that needs to be hashed:<br />
<textarea name='text_to_be_hashed' cols='20' rows='5'><?php echo $text_to_be_hashed; ?></textarea><br /><br />
<select name='hash_type'>
<option value='md5'>MD5</option>
<option value='sha1'>SHA1</option>
</select>
<input type='submit' name='subm_hash' value='Calculate hash' /><br /><br />
Hash of text:<br />
<input type='text' value='<?php echo $text_hash; ?>' name='text_hash' /><br />
</td>
<td>
<h2>Encryption</h2>
Text to be encrypted:<br />
<textarea name='text_to_be_enc' cols='20' rows='5'><?php echo $text_to_be_enc; ?></textarea><br /><br />
Key: <input type='text' name='enc_key' value='<?php echo $enc_key; ?>' /><br /><br />
<select name='enc_type'>
<option value='rijndael'>Rijndael</option>
</select>
<input type='submit' name='subm_enc' value='Encrypt' /><br /><br />
Encrypted text: <br />
<textarea name='text_enc' cols='20' rows='5'><?php echo $text_enc; ?></textarea><br />
<br />
</td>
<td>
<h2>Decryption</h2>
Text to be decrypted:<br />
<textarea name='text_to_be_dec' cols='20' rows='5'><?php echo $text_to_be_dec; ?></textarea><br /><br />
Key: <input type='text' name='dec_key' value='<?php echo $dec_key; ?>' /><br /><br />
<select name='dec_type'>
<option value='rijndael'>Rijndael</option>
</select>
<input type='submit' name='subm_dec' value='Decrypt' /><br /><br />
Decrypted text: <br />
<textarea name='text_dec' cols='20' rows='5'><?php echo $text_dec; ?></textarea><br />
<br />
</td>
</tr>
</table>
</form>

Code Snippet (Syntax highlighted) - Toggle Wrap

/* Setting form values, if they are not send as form values: */

/* Hash form values: */
$text_to_be_hashed = (isset($_POST['text_to_be_hashed'])) ? $_POST['text_to_be_hashed'] : "";
$text_hash = (isset($_POST['text_hash'])) ? $_POST['text_hash'] : "";
$hash_type = (isset($_POST['hash_type'])) ? $_POST['hash_type'] : "";

/* Encryption form values: */
$text_to_be_enc = (isset($_POST['text_to_be_enc'])) ? $_POST['text_to_be_enc'] : "";
$text_enc = (isset($_POST['text_enc'])) ? $_POST['text_enc'] : "";
$enc_key = (isset($_POST['enc_key'])) ? $_POST['enc_key'] : "";
$enc_type = (isset($_POST['enc_type'])) ? $_POST['enc_type'] : "";

/* Decryption form values: */
$text_to_be_dec = (isset($_POST['text_to_be_dec'])) ? $_POST['text_to_be_dec'] : "";
$text_dec = (isset($_POST['text_dec'])) ? $_POST['text_dec'] : "";
$dec_key = (isset($_POST['dec_key'])) ? $_POST['dec_key'] : "";
$dec_type = (isset($_POST['dec_type'])) ? $_POST['dec_type'] : "";

Code Snippet (Syntax highlighted) - Toggle Wrap

if (isset($_POST['subm_hash'])) {

/* Calculating hash depending on hash type: */

if ($hash_type == 'md5') {
$text_hash = md5($text_to_be_hashed);
} else if ($hash_type == 'sha1') {
$text_hash = sha1($text_to_be_hashed);
}

} /* Here the encryption code is added (see next code) */

Code Snippet (Syntax highlighted) - Toggle Wrap

else if (isset($_POST['subm_enc'])) {

/* Calculating encryption text depending on type: */

if ($enc_type == 'rijndael') {

// Create the key:
$key = $enc_key;

// Set the data:
$data = $text_to_be_enc;

// Open the cipher:
// Using Rijndael 256 in CBC mode.
$m = mcrypt_module_open('rijndael-256', '', 'cbc', '');

// Initialize the encryption:
mcrypt_generic_init($m, $key, "00000000000000000000000000000000");

// Encrypt the data:
if ($data != "") {
$data = mcrypt_generic($m, $data);
}

// Close the encryption handler:
mcrypt_generic_deinit($m);

// Close the cipher:
mcrypt_module_close($m);

// Returning the encrypted data:
$text_enc = base64_encode($data);

}

}

Code Snippet (Syntax highlighted) - Toggle Wrap

else if (isset($_POST['subm_dec'])) {

if ($enc_type == 'rijndael') {

// Create the key:
$key = $dec_key;

// Set the data:
$data = $text_to_be_dec;

// Open the cipher:
// Using Rijndael 256 in CBC mode.
$m = mcrypt_module_open('rijndael-256', '', 'cbc', '');

// Initialize the encryption:
mcrypt_generic_init($m, $key, "00000000000000000000000000000000");

// Decrypt the data:
if ($data != "") {
$data = mdecrypt_generic($m, base64_decode($data));
}

// Close the encryption handler:
mcrypt_generic_deinit($m);

// Close the cipher:
mcrypt_module_close($m);

$text_dec = trim($data);

}

}