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overflowerror 2014-03-06 11:22:49 +01:00
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15
README.md
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Chiff69
=======
kids' stuff
Chiff69 is a collection of encryption-algorithms, which use a keylength of 69 bit.
Because this it made by an amateur __DO NOT__ use this software for any security applications.
Chiff69/a
---------
This algorithm uses 72 bit to encrypt the text, but the last 3 Bits will be set to 0. This one only uses substitutions.
Chiff69/b
---------
This one uses 64 bit for the substitution (like Chiff69/a). The last 5 bits are used for a rail-fence-cpher-style pre-permutation.

69
chiff69a.php Executable file
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#!/usr/bin/php
<?php
/*
* parameters:
* 1: passphrase
* 2: encrypt or decrypt
* 3: base64 (optimal)
*
* everthing else: stdin/stdout
*/
if ($_SERVER['argc'] < 2)
exit(); // no password given
$passphrase = $_SERVER['argv'][1];
$key = array();
for ($i = 0; $i < 5; $i++)
$key[$i] = 0;
for ($i = 0; $i < strlen($passphrase); $i++) {
$char = ord(substr($passphrase, $i, 1));
$key[$i % 5] ^= $char;
}
for ($i = 0; $i < 4; $i++)
$key[$i] &= 0xff;
$key[4] &= 0x1f;
$text = "";
$stdin = fopen('php://stdin', 'r');
for ($i = 0; !feof($stdin); $i++) {
$char = fread($stdin, 1);
$text .= $char;
}
if (($_SERVER['argc'] > 3) && ($_SERVER['argv'][3] == "base64") && ($_SERVER['argv'][2] == "decrypt"))
$text = base64_decode($text);
$tmp = array();
for ($i = 0; $i < strlen($text); $i++) {
$tmp[$i] = ord(substr($text, $i, 1));
}
$text = $tmp;
$alg = "";
// we are decrypting
if (($_SERVER['argc'] > 2) && ($_SERVER['argv'][2] == "decrypt")) {
$alg = create_function('$char, $key, $i', 'return (($char - $i) - $key) & 0xff;');
// we are encrypting
} else {
$alg = create_function('$char, $key, $i', 'return (($char + $key) + $i) & 0xff;');
}
$result = array();
for ($i = 0; $i < count($text); $i++) {
$result[$i] = $alg($text[$i], $key[$i % 5], $i * (2 * ($i % 2) - 1));
}
for ($i = 0; $i < count($result); $i++)
$result[$i] = chr($result[$i]);
$result = implode($result);
if (($_SERVER['argc'] > 3) && ($_SERVER['argv'][3] == "base64") && ($_SERVER['argv'][2] == "encrypt"))
$result = base64_encode($result);
echo $result . "\n";
?>

137
chiff69b.php Executable file
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#!/usr/bin/php
<?php
/*
* parameters:
* 1: passphrase
* 2: encrypt or decrypt
* 3: base64 (optimal)
*
* everthing else: stdin/stdout
*/
if ($_SERVER['argc'] < 2)
exit(); // no password given
$passphrase = $_SERVER['argv'][1];
$key = array();
for ($i = 0; $i < 5; $i++)
$key[$i] = 0x55;
for ($i = 0; $i < strlen($passphrase); $i++) {
$char = ord(substr($passphrase, $i, 1));
$key[$i % 5] ^= $char;
}
for ($i = 0; $i < 4; $i++)
$key[$i] &= 0xff;
$key[4] &= 0x1f;
$text = "";
$stdin = fopen('php://stdin', 'r');
$stderr = fopen("php://stderr", "w");
for ($i = 0; !feof($stdin); $i++) {
$char = fread($stdin, 1);
$text .= $char;
}
if (($_SERVER['argc'] > 3) && ($_SERVER['argv'][3] == "base64") && ($_SERVER['argv'][2] == "decrypt"))
$text = base64_decode($text);
if ($key[4] == 0)
$key[4] = 0x55;
//$key[4] = 2;
$tmp = array();
if (($_SERVER['argc'] > 2) && ($_SERVER['argv'][2] == "decrypt")) {
for ($i = 0; $i < strlen($text); $i++) {
$tmp[] = $text[$i];
}
$text = array();
for ($i = 0; $i < count($tmp); $i++) {
$text[] = $tmp[$i];
}
} else {
for ($i = 0; $i < $key[4]; $i++)
$tmp[$i] = array();
for ($i = 0; $i < strlen($text); $i++) {
$tmp[$i % $key[4]][] = $text[$i];
}
$max = 0;
for($i = 0; $i < count($tmp); $i++) {
if (count($tmp[$i]) > $max) {
$max = count($tmp[$i]);
$i = 0;
continue;
}
while (count($tmp[$i]) < $max) {
$tmp[$i][] = " ";
}
}
$text = array();
for ($i = 0; $i < count($tmp); $i++)
for ($j = 0; $j < count($tmp[$i]); $j++)
$text[] = $tmp[$i][$j];
}
$tmp = array();
for ($i = 0; $i < count($text); $i++) {
$tmp[$i] = ord($text[$i]);
}
$text = $tmp;
$alg = "";
// we are decrypting
if (($_SERVER['argc'] > 2) && ($_SERVER['argv'][2] == "decrypt")) {
$alg = create_function('$char, $key, $i', 'return (($char - $i) - $key) & 0xff;');
// we are encrypting
} else {
$alg = create_function('$char, $key, $i', 'return (($char + $key) + $i) & 0xff;');
}
$result = array();
for ($i = 0; $i < count($text); $i++) {
$result[$i] = $alg($text[$i], $key[$i % 4], $i * (2 * ($i % 2) - 1));
}
for ($i = 0; $i < count($result); $i++)
$result[$i] = chr($result[$i]);
if (($_SERVER['argc'] > 2) && ($_SERVER['argv'][2] == "decrypt")) {
$tmp = array();
for ($i = 0; $i < $key[4]; $i++)
$tmp[$i] = array();
for ($i = 0; $i < count($result); $i++) {
$a = (count($result) / $key[4]);
$b = $i % ceil($a);
$tmp[intval($b)][] = $result[$i];
}
$result = array();
for ($i = 0; $i < count($tmp); $i++)
for ($j = 0; $j < count($tmp[$i]); $j++)
$result[] = $tmp[$i][$j];
}
$result = implode($result);
if (($_SERVER['argc'] > 3) && ($_SERVER['argv'][3] == "base64") && ($_SERVER['argv'][2] == "encrypt"))
$result = base64_encode($result);
echo $result . "\n";
?>