aesEncrypt()
aesEncrypt( $plainText, $key) : string
AES加密
Parameters
| $plainText | String 明文 |
|
| $key | String 对称密钥 |
Throws
- \Exception
<?php
namespace Alipay\EasySDK\Kernel\Util;
class AES
{
/**
* AES加密
*
* @param $plainText String 明文
* @param $key String 对称密钥
* @return string
* @throws \Exception
*/
public function aesEncrypt($plainText, $key)
{
try {
if(strlen($key) == 0){
throw new \Exception("AES加密失败，plainText=".$plainText."，AES密钥为空。");
}
//AES, 128 模式加密数据 CBC
$screct_key = base64_decode($key);
$str = trim($plainText);
$str = $this->addPKCS7Padding($str);
$iv = str_repeat("\0", 16);
$encrypt_str = openssl_encrypt($str, 'aes-128-cbc', $screct_key, OPENSSL_NO_PADDING, $iv);
return base64_encode($encrypt_str);
} catch (\Exception $e) {
throw new \Exception("AES加密失败，plainText=".$plainText."，keySize=".strlen($key)."。".$e->getMessage());
}
}
/**
* AES解密
*
* @param $cipherText String 密文
* @param $key String 对称密钥
* @return false|string
* @throws \Exception
*/
public function aesDecrypt($cipherText, $key)
{
try{
if(strlen($key) == 0){
throw new \Exception("AES加密失败，plainText=".$cipherText."，AES密钥为空。");
}
//AES, 128 模式加密数据 CBC
$str = base64_decode($cipherText);
$screct_key = base64_decode($key);
$iv = str_repeat("\0", 16);
$decrypt_str = openssl_decrypt($str, 'aes-128-cbc', $screct_key, OPENSSL_NO_PADDING, $iv);
$decrypt_str = $this->stripPKSC7Padding($decrypt_str);
return $decrypt_str;
}catch (\Exception $e){
throw new \Exception("AES解密失败，cipherText=".$cipherText."，keySize=".strlen($key)."。".$e->getMessage());
}
}
/**
* 填充算法
* @param string $source
* @return string
*/
private function addPKCS7Padding($source)
{
$source = trim($source);
$block = 16;
$pad = $block - (strlen($source) % $block);
if ($pad <= $block) {
$char = chr($pad);
$source .= str_repeat($char, $pad);
}
return $source;
}
/**
* 移去填充算法
* @param string $source
* @return string
*/
private function stripPKSC7Padding($source)
{
$char = substr($source, -1);
$num = ord($char);
if ($num == 62) return $source;
$source = substr($source, 0, -$num);
return $source;
}
}