The Advanced Encryption Standard (AES) atau Rijndael KKP
Sorce code PHP AES 128
namespace hs;
Class Aes
/*
variable
$rnd = round
$Nr = Jumlah putaran
$Nb = Ukuran Blok
$Nk = Jumlah Key
Untuk AES 128 Nk = 4, Nb = 4 Nr = 10
operator ^ = XOR
ord() adalah menghasilkan kode ASCII dari suatu karakter
floor() pembulatan ke bawah
ceil() pembulatan keatas
keyword $this = mengakses properties(variable)
------
function chiper($input,$w)
chiper($input,$w) merupakan methode
$input dan $w merupakan parameter
------
array_merge() array berupa string dan pada array-array yang digabung terdapat indeks array yang sama
implode() fungsi yang di gunakan untuk menyatukan beberapa data, misalnya saya punya array str yang isinya a b dan c, saya ingin menggabungkan setiap lemen arraynya dan menyimpannya dalam sebuah variabel
*/
{
public static function cipher($input, $w)
{
$Nb = 4;
$Nr = count($w) / $Nb - 1;
$state = array();
for ($i = 0; $i < 4 * $Nb; $i++) $state[$i % 4][floor($i / 4)] = $input[$i];
$state = self::addRoundKey($state, $w, 0, $Nb);
for ($round = 1; $round < $Nr; $round++) {
$state = self::subBytes($state, $Nb);
$state = self::shiftRows($state, $Nb);
$state = self::mixColumns($state, $Nb);
$state = self::addRoundKey($state, $w, $round, $Nb);
}
$state = self::subBytes($state, $Nb);
$state = self::shiftRows($state, $Nb);
$state = self::addRoundKey($state, $w, $Nr, $Nb);
$output = array(4 * $Nb);
for ($i = 0; $i < 4 * $Nb; $i++) $output[$i] = $state[$i % 4][floor($i / 4)];
return $output;
}
private static function addRoundKey($state, $w, $rnd, $Nb)
{
for ($r = 0; $r < 4; $r++) {
for ($c = 0; $c < $Nb; $c++)
$state[$r][$c] ^= $w[$rnd * 4 + $c][$r];
}
return $state;
}
private static function subBytes($s, $Nb)
{
for ($r = 0; $r < 4; $r++) {
for ($c = 0; $c < $Nb; $c++)
$s[$r][$c] = self::$sBox[$s[$r][$c]];
}
return $s;
}
private static function shiftRows($s, $Nb)
{
$t = array(4);
for ($r = 1; $r < 4; $r++) {
for ($c = 0; $c < 4; $c++)
$t[$c] = $s[$r][($c + $r) % $Nb];
for ($c = 0; $c < 4; $c++)
$s[$r][$c] = $t[$c];
}
return $s;
}
private static function mixColumns($s, $Nb)
{
for ($c = 0; $c < 4; $c++) {
$a = array(4);
$b = array(4);
for ($i = 0; $i < 4; $i++) {
$a[$i] = $s[$i][$c];
$b[$i] = $s[$i][$c] & 0x80 ? $s[$i][$c] << 1 ^ 0x011b : $s[$i][$c] << 1;
}
$s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3];
$s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3];
$s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3];
$s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3];
}
return $s;
}
public static function keyExpansion($key)
{
$Nb = 4;
$Nk = count($key) / 4;
$Nr = $Nk + 6;
$w = array();
$temp = array();
for ($i = 0; $i < $Nk; $i++) {
$r = array($key[4 * $i], $key[4 * $i + 1], $key[4 * $i + 2], $key[4 * $i + 3]);
$w[$i] = $r;
}
for ($i = $Nk; $i < ($Nb * ($Nr + 1)); $i++) {
$w[$i] = array();
for ($t = 0; $t < 4; $t++) $temp[$t] = $w[$i - 1][$t];
if ($i % $Nk == 0) {
$temp = self::subWord(self::rotWord($temp));
for ($t = 0; $t < 4; $t++) $temp[$t] ^= self::$rCon[$i / $Nk][$t];
} else if ($Nk > 6 && $i % $Nk == 4) {
$temp = self::subWord($temp);
}
for ($t = 0; $t < 4; $t++) $w[$i][$t] = $w[$i - $Nk][$t] ^ $temp[$t];
}
return $w;
}
private static function subWord($w)
{
for ($i = 0; $i < 4; $i++)
$w[$i] = self::$sBox[$w[$i]];
return $w;
}
private static function rotWord($w)
{
$tmp = $w[0];
for ($i = 0; $i < 3; $i++) $w[$i] = $w[$i + 1];
$w[3] = $tmp;
return $w;
}
private static $sBox = array(
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16);
private static $rCon = array(
array(0x00, 0x00, 0x00, 0x00),
array(0x01, 0x00, 0x00, 0x00),
array(0x02, 0x00, 0x00, 0x00),
array(0x04, 0x00, 0x00, 0x00),
array(0x08, 0x00, 0x00, 0x00),
array(0x10, 0x00, 0x00, 0x00),
array(0x20, 0x00, 0x00, 0x00),
array(0x40, 0x00, 0x00, 0x00),
array(0x80, 0x00, 0x00, 0x00),
array(0x1b, 0x00, 0x00, 0x00),
array(0x36, 0x00, 0x00, 0x00));
public static function encrypt($plaintext, $password)
{
$blockSize = 16;
$nBits = 128;
$nBytes = $nBits / 8;
$pwBytes = array();
for ($i = 0; $i < $nBytes; $i++)
$pwBytes[$i] = ord(substr($password, $i, 1)) & 0xff;
$key = Aes::cipher($pwBytes, Aes::keyExpansion($pwBytes));
$key = array_merge($key, array_slice($key, 0, $nBytes - 16));
$counterBlock = array();
$nonce = floor(microtime(true) * 1000);
$nonceMs = $nonce % 1000;
$nonceSec = floor($nonce / 1000);
$nonceRnd = floor(rand(0, 0xffff));
for ($i = 0; $i < 2; $i++) $counterBlock[$i] = self::urs($nonceMs, $i * 8) & 0xff;
for ($i = 0; $i < 2; $i++) $counterBlock[$i + 2] = self::urs($nonceRnd, $i * 8) & 0xff;
for ($i = 0; $i < 4; $i++) $counterBlock[$i + 4] = self::urs($nonceSec, $i * 8) & 0xff;
$ctrTxt = '';
for ($i = 0; $i < 8; $i++) $ctrTxt .= chr($counterBlock[$i]);
$keySchedule = Aes::keyExpansion($key);
$blockCount = ceil(strlen($plaintext) / $blockSize);
$ciphertxt = array();
for ($b = 0; $b < $blockCount; $b++) {
for ($c = 0; $c < 4; $c++)
$counterBlock[15 - $c] = self::urs($b, $c * 8) & 0xff;
for ($c = 0; $c < 4; $c++)
$counterBlock[15 - $c - 4] = self::urs($b / 0x100000000, $c * 8);
$cipherCntr = Aes::cipher($counterBlock, $keySchedule);
$blockLength = $b < $blockCount - 1 ? $blockSize : (strlen($plaintext) - 1) % $blockSize + 1;
$cipherByte = array();
for ($i = 0; $i < $blockLength; $i++) {
$cipherByte[$i] = $cipherCntr[$i] ^ ord(substr($plaintext, $b * $blockSize + $i, 1));
$cipherByte[$i] = chr($cipherByte[$i]);
}
$ciphertxt[$b] = implode('', $cipherByte);
}
$ciphertext = $ctrTxt . implode('', $ciphertxt);
return $ciphertext;
}
public static function decrypt($ciphertext, $password)
{
$blockSize = 16;
$nBits = 128;
$nBytes = $nBits / 8;
$pwBytes = array();
for ($i = 0; $i < $nBytes; $i++) $pwBytes[$i] = ord(substr($password, $i, 1)) & 0xff;
$key = Aes::cipher($pwBytes, Aes::keyExpansion($pwBytes));
$key = array_merge($key, array_slice($key, 0, $nBytes - 16));
$counterBlock = array();
$ctrTxt = substr($ciphertext, 0, 8);
for ($i = 0; $i < 8; $i++) $counterBlock[$i] = ord(substr($ctrTxt, $i, 1));
$keySchedule = Aes::keyExpansion($key);
$nBlocks = ceil((strlen($ciphertext) - 8) / $blockSize);
$ct = array();
for ($b = 0; $b < $nBlocks; $b++) $ct[$b] = substr($ciphertext, 8 + $b * $blockSize, 16);
$ciphertext = $ct;
$plaintxt = array();
for ($b = 0; $b < $nBlocks; $b++) {
for ($c = 0; $c < 4; $c++)
$counterBlock[15 - $c] = self::urs($b, $c * 8) & 0xff;
for ($c = 0; $c < 4; $c++)
$counterBlock[15 - $c - 4] = self::urs(($b + 1) / 0x100000000 - 1, $c * 8) & 0xff;
$cipherCntr = Aes::cipher($counterBlock, $keySchedule);
$plaintxtByte = array();
for ($i = 0; $i < strlen($ciphertext[$b]); $i++) {
$plaintxtByte[$i] = $cipherCntr[$i] ^ ord(substr($ciphertext[$b], $i, 1));
$plaintxtByte[$i] = chr($plaintxtByte[$i]);
}
$plaintxt[$b] = implode('', $plaintxtByte);
}
$plaintext = implode('', $plaintxt);
return $plaintext;
}
private static function urs($a, $b)
{
$a &= 0xffffffff;
$b &= 0x1f;
if ($a & 0x80000000 && $b > 0) {
$a = ($a >> 1) & 0x7fffffff;
$a = $a >> ($b - 1);
} else {
$a = ($a >> $b);
}
return $a;
}
}
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