AES128位加密解密实例 用于数据加密（信息安全）
class aes{
const KEY="Eheyin2017042424";
const IV ="damiyinEheyin888";
/**
* pkcs7补码
* @param string $string 明文
* @param int $blocksize Blocksize , 以 byte 为单位
* @return String
*/
private function addPkcs7Padding($string, $blocksize = 32) {
$len = strlen($string); //取得字符串长度
$pad = $blocksize - ($len % $blocksize); //取得补码的长度
$string .= str_repeat(chr($pad), $pad); //用ASCII码为补码长度的字符， 补足最后一段
return $string;
}
/**
* 加密然后base64转码
*
* @param String 明文
* @param 加密的初始向量（IV的长度必须和Blocksize一样， 且加密和解密一定要用相同的IV）
* @param $key 密钥
*/
function aes256cbcEncrypt($str, $iv, $key ) {
return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $this->addPkcs7Padding($str) , MCRYPT_MODE_CBC, $iv));
}
/**
* 除去pkcs7 padding
*
* @param String 解密后的结果
*
* @return String
*/
private function stripPkcs7Padding($string){
$slast = ord(substr($string, -1));
$slastc = chr($slast);
$pcheck = substr($string, -$slast);
if(preg_match("/$slastc{".$slast."}/", $string)){
$string = substr($string, 0, strlen($string)-$slast);
return $string;
} else {
return false;
}
}
/**
* 解密
*
* @param String $encryptedText 二进制的密文
* @param String $iv 加密时候的IV
* @param String $key 密钥
* @return String
*/
function aes256cbcDecrypt($encryptedText, $iv, $key) {
$encryptedText =base64_decode($encryptedText);
return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $encryptedText, MCRYPT_MODE_CBC, $iv));
}
function aes128cbcDecrypt($encryptedText, $iv=self::IV, $key=self::KEY) {
$encryptedText =base64_decode($encryptedText);
return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encryptedText, MCRYPT_MODE_CBC, $iv));
}
function hexToStr($hex)//十六进制转字符串
{
$string="";
for($i=0;$i<strlen($hex)-1;$i+=2)
$string.=chr(hexdec($hex[$i].$hex[$i+1]));
return $string;
}
function strToHex($string)//字符串转十六进制
{
$hex="";
$tmp="";
for($i=0;$i<strlen($string);$i++)
{
$tmp = dechex(ord($string[$i]));
$hex.= strlen($tmp) == 1 ? "0".$tmp : $tmp;
}
$hex=strtoupper($hex);
return $hex;
}
function aes128cbcHexDecrypt($encryptedText, $iv=self::IV, $key=self::KEY) {
$str = $this->hexToStr($encryptedText);
return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_CBC, $iv));
}
function aes128cbcEncrypt($str, $iv=self::IV, $key=self::KEY ) { // $this->addPkcs7Padding($str,16)
$base = (mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key,$this->addPkcs7Padding($str,16) , MCRYPT_MODE_CBC, $iv));
return $this->strToHex($base);
}
}
/*
*涉及安全 仅用于测试 请不要公开使用
*/
//路由转发
$action = isset($_REQUEST['act']) ? trim($_REQUEST['act']) : 'aes';
$function_name = 'action_' . $action;
call_user_func($function_name);
//加密
function action_aes(){
//设置json格式
header('content-type:application/json;charset=utf-8');
$str =$_POST['param'];
if(!$str){
$result['error'] = 0;
$result['message'] = '数据为空';
die(json_encode($result));
}
$data=json_encode($str);
//接口加密
include_once('../aes.php');
$aes = new aes;
//钥匙
$key="Eheyin2017042424";
$iv ="damiyinEheyin888";
$new_data=$aes->aes128cbcEncrypt($data,$iv,$key);
$result['error'] = 1;
$result['data']=$new_data;
$result['message'] = '加密成功';
die(json_encode($result));
}
//解密
function action_daes(){
//设置json格式
header('content-type:application/json;charset=utf-8');
$str =$_POST['param'];
if(!$str){
$result['error'] = 0;
$result['message'] = '数据为空';
die(json_encode($result));
}
//接口加密
include_once('../aes.php');
$aes = new aes;
//钥匙
$key="Eheyin2017042424";
$iv ="damiyinEheyin888";
$new_data=json_decode($aes->aes128cbcHexDecrypt($str,$iv,$key),true);
$result['error'] = 1;
$result['data']=$new_data;
$result['message'] = '解密成功';
die(json_encode($result));
}