def _sdes_gen_key(k: BitString) -> List[BitString]:
actual_key = bit_string.permutation_by_table(k, _sdes_gen_key_p10_table)
result = []
key_l = actual_key[:_sdes_key_length // 2]
key_r = actual_key[_sdes_key_length // 2:]
for i in range(_sdes_gen_key_rounds):
key_l = bit_string.left_rshift(key_l,
_sdes_gen_key_lshift_count_table[i])
key_r = bit_string.left_rshift(key_r,
_sdes_gen_key_lshift_count_table[i])
result.append(
bit_string.permutation_by_table(operator.add(key_l, key_r),
_sdes_gen_key_p8_table))
return result
def _sdes_p4(bs: BitString) -> BitString:
return bit_string.permutation_by_table(bs, _sdes_p4_table)
def _des_gen_key_pc_2_inv(bs: BitString) -> BitString:
return bit_string.permutation_by_table(bs, _des_gen_key_pc_2_inv_table)
def _des_ip_inv(bs: BitString) -> BitString:
return bit_string.permutation_by_table(bs, _des_ip_inv_table)
def _des_ip(p: BitString) -> BitString:
return bit_string.permutation_by_table(p, _des_ip_table)
def _des_gen_key_pc_2(k: BitString) -> BitString:
return bit_string.permutation_by_table(k, _des_gen_key_pc_2_table)