카카오로그인 연동 방식 변경

-oauth 테이블 삭제
-비밀번호 변경 기능 추가(카카오톡 나에게 보내기)

f_func/func.php

@@ -203,4 +203,26 @@ function toInt($val, $force=false){
         return intval($val);
     }
     throw new InvalidArgumentException('올바르지 않은 타입형 :'.$val);
-}
+}
+
+/**
+ * Generate a random string, using a cryptographically secure 
+ * pseudorandom number generator (random_int)
+ * 
+ * For PHP 7, random_int is a PHP core function
+ * For PHP 5.x, depends on https://github.com/paragonie/random_compat
+ * 
+ * @param int $length      How many characters do we want?
+ * @param string $keyspace A string of all possible characters
+ *                         to select from
+ * @return string
+ */
+function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
+{
+    $str = '';
+    $max = mb_strlen($keyspace, '8bit') - 1;
+    for ($i = 0; $i < $length; ++$i) {
+        $str .= $keyspace[random_int(0, $max)];
+    }
+    return $str;
+}