def KSA(key):
 keylength = len(key)
 S = list(range(256))
 j = 0
 for i in range(256):
  j = (((j + S[i]) + key[(i % keylength)]) % 256)
  (S[i], S[j]) = (S[j], S[i])
 return S

def KSA ( key ) : keylength = len ( key ) S = list ( range ( 256 ) ) j = 0 for i in range ( 256 ) : j = ( ( ( j + S [ i ] ) + key [ ( i % keylength ) ] ) % 256 ) ( S [ i ] , S [ j ] ) = ( S [ j ] , S [ i ] ) return S
run key scheduling algorithm .