fix

Tool/BC/BcDecHex.php

@@ -12,7 +12,7 @@ trait BcDecHex {
 		if ($remain == 0) {
 			return dechex($last);
 		} else {
-			return bcdechex($remain) . dechex($last);
+			return $this->bcdechex($remain) . dechex($last);
 		}
 	}
 }

Tool/BC/BcHexDec.php

@@ -11,7 +11,7 @@ trait BcHexDec {
 		} else {
 			$remain = substr($hex, 0, -1);
 			$last   = substr($hex, -1);
-			return bcadd(bcmul(16, bchexdec($remain)), hexdec($last));
+			return bcadd(bcmul(16, $this->bchexdec($remain)), hexdec($last));
 		}
 	}
 }