standstand aes 128 crypt

 <?php
 /**
- * aes加密解密
+ * AES, 128 ECB模式加密数据
  */
 
 namespace Plugin;
 
 class Encryption {
-    public static $iv = null;
-    public static $key = 'yoho9646abcdef';
-    public static $mode = MCRYPT_MODE_ECB;//MCRYPT_MODE_ECB、MCRYPT_MODE_CFB、MCRYPT_MODE_OFB、MCRYPT_MODE_NOFB、MCRYPT_MODE_CBC
-    private static $cipher = MCRYPT_RIJNDAEL_128;//MCRYPT_RIJNDAEL_192、MCRYPT_RIJNDAEL_256
     
-    public static function encrypt($data) {
-        $data = base64_encode(mcrypt_encrypt( self::$cipher, self::$key, $data, self::$mode, self::$iv));
-        return $data;
+    //密钥
+    private static $_secrect_key = 'yoho9646abcdefgh';
+
+    /**
+     * 加密方法
+     * @param string $str
+     * @return string
+     */
+    public static function encrypt($str){
+        //AES, 128 ECB模式加密数据
+        $screct_key = self::$_secrect_key;
+        $str = trim($str);
+        $str = self::addPKCS7Padding($str);
+        $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_ECB),MCRYPT_RAND);
+        $encrypt_str =  mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_ECB, $iv);
+        return base64_encode($encrypt_str);
+    }
+
+    /**
+     * 解密方法
+     * @param string $str
+     * @return string
+     */
+    public static function decrypt($str){
+        //AES, 128 ECB模式加密数据
+        $screct_key = self::$_secrect_key;
+        $str = base64_decode($str);
+        $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_ECB),MCRYPT_RAND);
+        $encrypt_str =  mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_ECB, $iv);
+        $encrypt_str = trim($encrypt_str);
+        $encrypt_str = self::stripPKSC7Padding($encrypt_str);
+        return $encrypt_str;
+
+    }
+
+    /**
+     * 填充算法
+     * @param string $source
+     * @return string
+     */
+    private static function addPKCS7Padding($source){
+        $source = trim($source);
+        $block = mcrypt_get_block_size('rijndael-128', 'ecb');
+        $pad = $block - (strlen($source) % $block);
+        if ($pad <= $block) {
+            $char = chr($pad);
+            $source .= str_repeat($char, $pad);
+        }
+        return $source;
     }
-    public static function decrypt($data) {
-        $data = mcrypt_decrypt( self::$cipher, self::$key, base64_decode($data), self::$mode, self::$iv);
-        return $data;
+    /**
+     * 移去填充算法
+     * @param string $source
+     * @return string
+     */
+    private static function stripPKSC7Padding($source){
+        $source = trim($source);
+        $char = substr($source, -1);
+        $num = ord($char);
+        if($num==62)return $source;
+        $source = substr($source,0,-$num);
+        return $source;
     }
 }
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