sqlite3, 283 bytes

Result

AC

Duration

998ms

Code [DL]

with x(i,j)as(select substr(v,0,instr(v,'
'))+0 as i,substr(v,instr(v,'
')+1)as j from i),c(k)as(values(1)union select k+1 from c limit(select i from x))select case when(k=1 or k=i)then replace(hex(zeroblob(j)),'00','*')else '*'||replace(hex(zeroblob(j-2)),'00',' ')||'*'end from x,c

stdin

14
58

stdout

**********************************************************
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
*                                                        *
**********************************************************

stderr