Question

I have to store a string (non-numeric, can contain any UTF8 Chars) in a BigInteger to perform some Mathematical operations with it. I need the conversion to be deterministic which

BigInteger mybigint = new BigInteger(mystring.getBytes());

does not seem to be…

Also I need to be able to convert it back from BigInteger to String. If I convert a String to BigInteger and back it needs to be identical afterwards.

Does anyone have an Idea how to do that?
Thank you in advance!

Answer 1

This IS deterministic :

BigInteger mybigint = new BigInteger(mystring.getBytes("UTF-8"));

And you can revert it using

new String(mybigint.toByteArray(), "UTF-8");

I can’t exclude there is some kind of usefulness to this process but if you’re not sure don’t hesitate to mention why you do this.