checkKey static method
Implementation
static bool checkKey(Uint8List key) {
var c1 = checkMask(key[3], R_MASK_HIGH_4);
var c2 = checkMask(key[7], R_MASK_HIGH_4);
var c3 = checkMask(key[11], R_MASK_HIGH_4);
var c4 = checkMask(key[15], R_MASK_HIGH_4);
var c5 = checkMask(key[4], R_MASK_LOW_2);
var c6 = checkMask(key[8], R_MASK_LOW_2);
var c7 = checkMask(key[12], R_MASK_LOW_2);
return !(c1 || c2 || c3 || c4 || c5 || c6 || c7);
}