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