8bf55dbfef
implementation of knaccc's "return address scheme" (for more information on this, please see https://github.com/monero-project/research-lab/issues/53). Fulmo's PROTOCOL_TX construct relies on a variation of knaccc's design to be able to make return payments to individuals. This code is not commercial-grade - it isn't even safe for alpha testing yet, but it is operational under at least some circumstances, and the math is correct. Caveat emptor.