// key must be 16 or 32 bit... here a sample 16 bit key
key = "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10";

// create encoder
Snow2 snow(key):

// encode text
String s "Some text to encode";
String encoded = snow(s);

// reset encoder/decoder
snow.SetKey(key);

// decode text
String decoded = snow(encoded);