Method extendedEcAdd

java/lib/src/main/java/io/github/ccxt/Exchange.java:3122–3131

(ExtendedStarknetPoint point1, ExtendedStarknetPoint point2)

    }

    private static ExtendedStarknetPoint extendedEcAdd(ExtendedStarknetPoint point1, ExtendedStarknetPoint point2)
    {
        if (point1.x.subtract(point2.x).mod(EXTENDED_STARKNET_FIELD_PRIME).equals(BigInteger.ZERO)) {
            throw new RuntimeException("Points must have different x coordinates.");
        }
        BigInteger slope = extendedDivMod(point1.y.subtract(point2.y), point1.x.subtract(point2.x), EXTENDED_STARKNET_FIELD_PRIME);
        BigInteger x = extendedField(slope.multiply(slope).subtract(point1.x).subtract(point2.x));
        BigInteger y = extendedField(slope.multiply(point1.x.subtract(x)).subtract(point1.y));
        return new ExtendedStarknetPoint(x, y);
    }

    private static ExtendedStarknetPoint extendedEcDouble(ExtendedStarknetPoint point)
    {