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.")
if self.value.y.isLargerThanNegative() != g1[2]:
MilagroPairing.FP2_BLS381_neg(byref(self.value.y),
byref(self.value.y))
def toPublicKey(self) -> PublicKey:
result: PublicKey = PublicKey.__new__(PublicKey)
result.value = G2Obj()
MilagroPairing.ECP2_BLS381_generator(byref(result.value))
MilagroPairing.ECP2_BLS381_mul(byref(result.value), self.value)
return result
def verify(self, agInfo: AggregationInfo) -> bool:
if self.isInf():
return False
sig: G1Obj = self.value
generator: G2Obj = G2Obj()
sigPairing: FP12Obj = FP12Obj()
MilagroCurve.ECP_BLS381_neg(byref(sig))
MilagroPairing.ECP2_BLS381_generator(byref(generator))
MilagroPairing.PAIR_BLS381_ate(byref(sigPairing), byref(generator),
byref(sig))
MilagroPairing.FP12_BLS381_ssmul(byref(sigPairing),
byref(agInfo.value))
MilagroPairing.PAIR_BLS381_fexp(byref(sigPairing))
return int(MilagroPairing.FP12_BLS381_isunity(byref(sigPairing))) == 1
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