Discription:
1. read keys from the url
e.g. http://g2384.github.io/js-RSA/?12e9a5?dc12d?216a45 generates:
// key length = 24 bits
key = new RSAKeyPair(
"12e9a5",
"dc12d",
"216a45"
);
2. unicode() function to support all characters
Demo: http://g2384.github.io/js-RSA/?12e9a5?dc12d?216a45