/** * Process a single EC point using the basic ElGamal algorithm. * * @param point the EC point to process. * @return the result of the Elgamal process. */ public ECPair encrypt(ECPoint point) { if (key == null) { throw new IllegalStateException("ECElGamalEncryptor not initialised"); } ECDomainParameters ec = key.getParameters(); BigInteger k = ECUtil.generateK(ec.getN(), random); ECMultiplier basePointMultiplier = createBasePointMultiplier(); ECPoint[] gamma_phi = new ECPoint[]{ basePointMultiplier.multiply(ec.getG(), k), key.getQ().multiply(k).add(point) }; ec.getCurve().normalizeAll(gamma_phi); return new ECPair(gamma_phi[0], gamma_phi[1]); }
/** * Process a single EC point using the basic ElGamal algorithm. * * @param point the EC point to process. * @return the result of the Elgamal process. */ public ECPair encrypt(ECPoint point) { if (key == null) { throw new IllegalStateException("ECElGamalEncryptor not initialised"); } ECDomainParameters ec = key.getParameters(); BigInteger k = ECUtil.generateK(ec.getN(), random); ECMultiplier basePointMultiplier = createBasePointMultiplier(); ECPoint[] gamma_phi = new ECPoint[]{ basePointMultiplier.multiply(ec.getG(), k), key.getQ().multiply(k).add(ECAlgorithms.cleanPoint(ec.getCurve(), point)) }; ec.getCurve().normalizeAll(gamma_phi); return new ECPair(gamma_phi[0], gamma_phi[1]); }