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<div class="codetitle"><a style="CURSOR: pointer" data="13087" class="copybut" id="copybut13087" onclick="doCopy('code13087')"> 代码如下:<div class="codebody" id="code13087">
<?php
class Crypt3Des
{
private $key = "";
private $iv = "";
/*
构造，传递二个已经进行base64_encode的KEY与IV
@param string $key
@param string $iv
/
function __construct ($key,$iv)
{
if (empty($key) || empty($iv)) {
echo 'key and iv is not valid';
exit();
}
$this->key = $key;
$this->iv = $iv;
}
/
加密
@param $value
@return
/
public function encrypt ($value)
{
$td = mcrypt_module_open(MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
$iv = base64_decode($this->iv);
$value = $this->PaddingPKCS7($value);
$key = base64_decode($this->key);
mcrypt_generic_init($td,$key,$iv);
$ret = base64_encode(mcrypt_generic($td,$value));
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
/
解密
@param $value
@return
/
public function decrypt ($value)
{
$td = mcrypt_module_open(MCRYPT_3DES,'');
$iv = base64_decode($this->iv);
$key = base64_decode($this->key);
mcrypt_generic_init($td,$iv);
$ret = trim(mdecrypt_generic($td,base64_decode($value)));
$ret = $this->UnPaddingPKCS7($ret);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
private function PaddingPKCS7 ($data)
{
$block_size = mcrypt_get_block_size('tripledes','cbc');
$padding_char = $block_size - (strlen($data) % $block_size);
$data .= str_repeat(chr($padding_char),$padding_char);
return $data;
}
private function UnPaddingPKCS7 ($text)
{
$pad = ord($text{strlen($text) - 1});
if ($pad > strlen($text)) {
return false;
}
if (strspn($text,chr($pad),strlen($text) - $pad) != $pad) {
return false;
}
return substr($text,- 1 * $pad);
}
}
?>
（编辑：李大同）
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