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 ) -> None: key = key.rjust(48, b'\0') self.value: Big384 = Big384() MilagroCurve.BIG_384_58_fromBytesLen(self.value, c_char_p(key), 48) MilagroCurve.BIG_384_58_mod(self.value, r)
def serialize( self ) -> bytes: x: Big384 = Big384() y: Big384 = Big384() MilagroCurve.ECP_BLS381_get(x, y, byref(self.value)) yNeg: Big384 = Big384() MilagroCurve.FP_BLS381_neg(self.value.y, self.value.y) MilagroCurve.ECP_BLS381_get(x, yNeg, byref(self.value)) MilagroCurve.FP_BLS381_neg(self.value.y, self.value.y) return bytes(serialize(x, MilagroCurve.BIG_384_58_comp(y, yNeg) == 1))
def parse( gArg: bytes, second: bool = False ) -> Tuple[bool, bool, bool, Big384]: if len(gArg) != 48: raise Exception("Invalid length G.") flags = gArg[0] g: bytearray = bytearray(gArg) g[0] = g[0] & CLEAR_FLAGS if (not second) and (flags & C_FLAG == 0): raise Exception("Uncompressed G.") b: int = 1 if flags & B_FLAG != 0: while b < 48: if g[b] != 0: break b += 1 result: Big384 = Big384() MilagroCurve.BIG_384_58_fromBytesLen(result, c_char_p(bytes(g)), 48) return (flags & B_FLAG != 0, b == 48, flags & A_FLAG != 0, result)
def msgToG( msg: bytes ) -> G1Obj: result: G1Obj = G1Obj() hashed: OctetObj = OctetObj() shake: Any = shake_256() shake.update(msg) hashed.val = c_char_p(shake.digest(48)) hashed.len = 48 hashed.max = 48 MilagroCurve.ECP_BLS381_mapit(byref(result), hashed) 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 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)
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( g: Big384, largerY: bool ) -> bytearray: buffer: Array[c_char] = create_string_buffer(48) MilagroCurve.BIG_384_58_toBytes(buffer, g) result: bytearray = bytearray(buffer) result[0] = result[0] | C_FLAG inf: int = 1 if result[0] == C_FLAG: while inf < 48: if result[inf] != 0: break inf += 1 if inf == 48: result[0] = result[0] | B_FLAG return result if largerY: result[0] = result[0] | A_FLAG return result
def serialize( self ) -> bytes: result: Array[c_char] = create_string_buffer(48) MilagroCurve.BIG_384_58_toBytes(result, self.value) return bytes(result)
def isInf( self ) -> bool: return int(MilagroCurve.ECP_BLS381_isinf(byref(self.value))) == 1