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class CryptAES{
protected
$cipher = MCRYPT_RIJNDAEL_128;
protected
$mode = MCRYPT_MODE_ECB;
protected
$pad_method = NULL;
protected
$secret_key = ‘‘;
protected
$iv = ‘‘;
public
function set_cipher($cipher){
$this->cipher = $cipher;
}
public
function set_mode($mode){
$this->mode = $mode;
}
public
function set_iv($iv){
$this->iv = $iv;
}
public
function set_key($key){
$this->secret_key = $key;
}
public
function require_pkcs5(){
$this->pad_method = ‘pkcs5‘;
}
protected
function pad_or_unpad($str, $ext){
if
( is_null($this->pad_method) ){
return
$str;
}else{
$func_name
= __CLASS__
. ‘::‘ . $this->pad_method . ‘_‘
. $ext . ‘pad‘;
if
( is_callable($func_name) ){
$size
= mcrypt_get_block_size($this->cipher, $this->mode);
return
call_user_func($func_name, $str, $size);
}
}
return
$str;
}
protected
function pad($str){
return
$this->pad_or_unpad($str, ‘‘);
}
protected
function unpad($str){
return
$this->pad_or_unpad($str, ‘un‘);
}
public
function encrypt($str){
$str
= $this->pad($str);
$td
= mcrypt_module_open($this->cipher, ‘‘, $this->mode, ‘‘);
if
( empty($this->iv) ){
$iv
= @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
}else{
$iv
= $this->iv;
}
mcrypt_generic_init($td, $this->secret_key, $iv);
$cyper_text
= mcrypt_generic($td, $str);
$rt=base64_encode($cyper_text);
//$rt = bin2hex($cyper_text);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return
$rt;
}
public
function decrypt($str){
$td
= mcrypt_module_open($this->cipher, ‘‘, $this->mode, ‘‘);
if
( empty($this->iv) ){
$iv
= @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
}else{
$iv
= $this->iv;
}
mcrypt_generic_init($td, $this->secret_key, $iv);
//$decrypted_text = mdecrypt_generic($td, self::hex2bin($str));
$decrypted_text
= mdecrypt_generic($td, base64_decode($str));
$rt
= $decrypted_text;
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return
$this->unpad($rt);
}
public
static function hex2bin($hexdata) {
$bindata
= ‘‘;
$length
= strlen($hexdata);
for
($i=0; $i
< $length; $i
+= 2){
$bindata
.= chr(hexdec(substr($hexdata, $i, 2)));
}
return
$bindata;
}
public
static function pkcs5_pad($text, $blocksize){
$pad
= $blocksize
- (strlen($text) % $blocksize);
return
$text . str_repeat(chr($pad), $pad);
}
public
static function pkcs5_unpad($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, 0, -1 * $pad);
}
} |
原文: http://alunblog.duapp.com/?p=17