def __init__(self, sig: bytes = bytes()) -> None:
self.value: G1Obj = G1Obj()
if len(sig) == 0:
MilagroPairing.ECP_BLS381_inf(byref(self.value))
return
g: Tuple[bool, bool, bool, Big384] = parse(sig)
if g[0] != g[1]:
raise Exception("Infinite flag set improperly.")
if g[0]:
MilagroPairing.ECP_BLS381_inf(byref(self.value))
return
if MilagroPairing.ECP_BLS381_setx(byref(self.value), g[3], 0) != 1:
raise Exception("Invalid G1.")
yNeg: FP1Obj = FP1Obj()
MilagroPairing.FP_BLS381_neg(byref(yNeg), byref(self.value.y))
a: Big384 = Big384()
b: Big384 = Big384()
MilagroCurve.FP_BLS381_redc(a, byref(self.value.y))
MilagroCurve.FP_BLS381_redc(b, byref(yNeg))
if (MilagroCurve.BIG_384_58_comp(a, b) == 1) != g[2]:
if MilagroPairing.ECP_BLS381_setx(byref(self.value), g[3], 1) != 1:
raise Exception("Setting a proven valid X failed.")
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 serialize(self) -> bytes:
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)
MilagroCurve.FP_BLS381_redc(a, byref(self.value.x.a))
MilagroCurve.FP_BLS381_redc(b, byref(self.value.x.b))
result: bytearray = serialize(b, cmpRes == 1)
result += serialize(a, False)
result[48] = result[48] & CLEAR_FLAGS
return bytes(result)