import "utils/pack/nonStrictUnpack256" as unpack256

// Compress JubJub Curve Point to 256bit array using big endianness bit order
// Python reference code from pycrypto:
// def compress(self):
// 	x = self.x.n
// 	y = self.y.n
// 	return int.to_bytes(y | ((x & 1) << 255), 32, "big")

def main(field[2] pt)  -> (bool[256]):
	field x = pt[0]
	field y = pt[1]

	bool[256] xBits = unpack256(x)
	bool[256] yBits = unpack256(y)

	bool sign = xBits[255]
	yBits[0] = sign

	return yBits