| <?php
Class DES
{
var $key;
var $iv; Offset amount
function DES ($key = ' 11001100 ', $iv = 0) {
Key Length 8 For example: 1234ABCD
$this->key = $key;
if ($iv = = 0) {
$this->iv = $key; Default to $key as IV
} else {
$this->iv = $iv; Mcrypt_create_iv (Mcrypt_get_block_size (Mcrypt_des, MCRYPT_MODE_CBC), mcrypt_dev_random);
}
}
function Encrypt ($STR) {
Encryption, returning uppercase hexadecimal strings
$size = Mcrypt_get_block_size (Mcrypt_des, MCRYPT_MODE_CBC);
$str = $this->pkcs5pad ($str, $size);
Return Strtoupper (Bin2Hex (MCRYPT_CBC (mcrypt_des, $this->key, $str, Mcrypt_encrypt, $this->iv)));
}
function Decrypt ($STR) {
Decrypt
$strBin = $this->hex2bin (strtolower ($STR));
$str = MCRYPT_CBC (mcrypt_des, $this->key, $strBin, Mcrypt_decrypt, $this->iv);
$str = $this->pkcs5unpad ($STR);
return $str;
}
function Hex2bin ($hexData) {
$binData = "";
for ($i = 0; $i < strlen ($hexData); $i + + 2) {
$binData. = Chr (Hexdec (substr ($hexData, $i, 2));
}
return $binData;
} function Pkcs5pad ($text, $blocksize) {
$pad = $ BlockSize-(strlen ($text)% $blocksize);
return $text. Str_repeat (Chr ($pad), $pad);
}
function Pkcs5unpad ($text) {
$pad = Ord ($text {strlen ($text)-1});
if ($pad > strlen ($text))
return false;
if (strspn ($text, Chr ($pad), strlen ($text)-$pad)!= $pad)
& nbsp; return false;
return substr ($text, 0,-1 * $pad);
}
}
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