string crypt(string str, int seed)
string crypt(string str, string seed)
string crypt(bytes str, int seed)
string crypt(bytes str, string seed)
Crypt the string <str> the first two characters
from the string <seed> as a seed. If <seed> is an integer, then
a random seed is used.
The result has the first two characters as the seed.
If you want to let enter password information without echo,
input_to() can be used with special argument.
md5(E), md5_crypt(E), sha1(E), hash(E), hmac(E)