def __init__( self, key: bytes = bytes() ) -> None: self.value: G2Obj = G2Obj() if len(key) == 0: MilagroPairing.ECP2_BLS381_inf(byref(self.value)) return if len(key) != 96: raise Exception("Invalid length Public Key.") if key[48] != (key[48] & CLEAR_FLAGS): raise Exception("G2's second G has flags set.") g1: Tuple[bool, bool, bool, Big384] = parse(key[0 : 48]) g2: Tuple[bool, bool, bool, Big384] = parse(key[48 : 96], True) if g1[0] != (g1[1] & g2[1]): raise Exception("Infinite flag set improperly.") if g1[0]: MilagroPairing.ECP2_BLS381_inf(byref(self.value)) return x: FP2Obj = FP2Obj() MilagroPairing.FP2_BLS381_from_BIGs(byref(x), g2[3], g1[3]) if MilagroPairing.ECP2_BLS381_setx(byref(self.value), byref(x)) == 0: raise Exception("Invalid G2.") yNeg: FP2Obj = FP2Obj() cmpRes: int MilagroPairing.FP2_BLS381_neg(byref(yNeg), byref(self.value.y)) a: Big384 = Big384() b: Big384 = Big384() MilagroCurve.FP_BLS381_redc(a, byref(self.value.y.b)) MilagroCurve.FP_BLS381_redc(b, byref(yNeg.b)) cmpRes = MilagroCurve.BIG_384_58_comp(a, b) if cmpRes == 0: MilagroCurve.FP_BLS381_redc(a, byref(self.value.y.a)) MilagroCurve.FP_BLS381_redc(b, byref(yNeg.a)) cmpRes = MilagroCurve.BIG_384_58_comp(a, b) if (cmpRes == 1) != g1[2]: self.value.y = yNeg
def aggregate( keys: List[Any] ) -> Any: result: PublicKey = PublicKey.__new__(PublicKey) result.value = G2Obj() if not keys: MilagroPairing.ECP2_BLS381_inf(byref(result.value)) return result result.value = keys[0].value for k in range(1, len(keys)): if keys[k].isInf(): MilagroPairing.ECP2_BLS381_inf(byref(result.value)) return result if not MilagroPairing.ECP2_BLS381_add(byref(result.value), byref(keys[k].value)) != 0: raise Exception("Milagro failed to add G2s.") return result