<!DOCTYPE html>
<html>
<title>basic encruption example</title>
<head>
<?php
// DEFINE our cipher
define('AES_256_CBC', 'aes-256-cbc');
// Generate a 256-bit encryption key
// This should be stored somewhere instead of recreating it each time
$encryption_key = openssl_random_pseudo_bytes(32);
// Generate an initialization vector
// This *MUST* be available for decryption as well
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length(AES_256_CBC));
// Create some data to encrypt
$data = $_POST['key'];;
echo "Before encryption: $data\n";
echo "<br>";
// Encrypt $data using aes-256-cbc cipher with the given encryption key and
// our initialization vector. The 0 gives us the default options, but can
// be changed to OPENSSL_RAW_DATA or OPENSSL_ZERO_PADDING
$encrypted = openssl_encrypt($data, AES_256_CBC, $encryption_key, 0, $iv);
echo "Encrypted: $encrypted\n"; echo "<br>";
// If we lose the $iv variable, we can't decrypt this, so:
// - $encrypted is already base64-encoded from openssl_encrypt
// - Append a separator that we know won't exist in base64, ":"
// - And then append a base64-encoded $iv
$encrypted = $encrypted . ':' . base64_encode($iv);
// To decrypt, separate the encrypted data from the initialization vector ($iv).
$parts = explode(':', $encrypted);
// $parts[0] = encrypted data
// $parts[1] = base-64 encoded initialization vector
// Don't forget to base64-decode the $iv before feeding it back to
//openssl_decrypt
$decrypted = openssl_decrypt($parts[0], AES_256_CBC, $encryption_key, 0, base64_decode($parts[1]));
echo "Decrypted: $decrypted\n";
?>
<?php
/*
print("-- Start --<br />");
$z = $_POST['key'];
$data = $_POST['plaintext'];
$mode = $_POST['mode'];
$iv = $_POST['iv'];
include("AES.class.php");
$aes = new AES($z, $mode, $iv);
$starte = microtime(true);
$encrypted = $aes->encrypt($data);
$ende = microtime(true);
print "Execution time to encrypt: " . ($ende - $starte) . " seconds<br />";
print "Cipher-Text: " . $encrypted . "<br />";
print "Hex: " . bin2hex($encrypted) . "<br />";
print "Base 64: " . base64_encode($encrypted) . "<br /><br />";
$startd = microtime(true);
$decrypted = $aes->decrypt($encrypted);
$endd = microtime(true);
print "Execution time to decrypt: " . ($endd - $startd) . " seconds<br />";
print "Decrypted-Text: " . stripslashes($decrypted);
print "<br />-- End --<br />";
*/
?>
</head>
<body>
<form method="POST" action="">
<table>
<tr><td align="right">Key:</td><td><input type="text" name="key" value="" size="34">
</td></tr>
<tr><td align="right">Mode:</td><td>
<select name="mode" style="width: 120px">
<option value="ECB">ECB</option><option value="CBC" selected>CBC</option>
<option value="CFB">CFB</option>
<option value="OFB">OFB</option>
</select></td></tr>
<tr><td align="right">Initialization Vector:</td><td>
<input type="text" name="iv" value="" size="16"> (used in all modes except ECB)</td></tr>
<tr><td align="right" valign="top">Plain-Text:</td><td>
<textarea name="plaintext" cols="40" rows="5"></textarea></td></tr>
<tr><td></td><td><input type="submit" name="submit" value="Encrypt!"></td></tr></p>
</table>
</form>
</body>
</html>
<?php
$data = "hello";
foreach (hash_algos() as $v) {
$r = hash($v, $data, false);
printf("%-12s %3d %s\n", $v, strlen($r), $r);
} ?>
<?php
echo "Building data...";
$data = "";
for($i = 0; $i < 1500; $i++)
$data .= sha1("H:k - $i - k:H");
echo "OK! (".strlen($data)." bytes)".PHP_EOL;
$res = [];
echo "Testing hashes.....".PHP_EOL;
foreach (hash_algos() as $algo) {
$time = microtime(1);
$hash = hash($algo, $data);
$time = (microtime(1) - $time) * 1000;
$length = strlen($hash);
$res["$time"][] = [
"algo" => "HEX-$algo",
"length" => "$length",
"time" => sprintf("%.8f", $time)
];
$time = microtime(1);
hash($algo, $data, 1);
$time = (microtime(1) - $time) * 1000;
$res["$time"][] = [
"algo" => "RAW-$algo",
"length" => "$length",
"time" => sprintf("%.8f", $time)
];
}
ksort($res);
$i = 0;
echo "Results:".PHP_EOL;
echo "Posit. Time in ms Type-Hash algo Hash length".PHP_EOL;
foreach($res as $sres){
foreach($sres as $result){
echo sprintf("%5d. %12s ms %-20s %-2d bytes", $i++, $result['time'], $result['algo'], $result['length']).PHP_EOL;
}
}?>
<?php
$val = 'hello';var_dump(crc32($val) == ( '0x' . hash('crc32b', $val) ) ); // bool(true)var_dump(crc32($val) == ( '0x' . hash('crc32', $val) ) ); // bool(false)?>
<?php
$val = 'hello';$crc64 = ( '0x' . hash('crc32', $val) . hash('crc32b', $val) ) );var_dump($crc64); // string(18) "0x3d6531193610a686"var_dump($crc64 + 0); // int(4423996193312384646)?>
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