Golang Int.Xor方法代码示例

func (z *Polynomial) Mul(x, y *Polynomial) *Polynomial {
	var zCoeffs *big.Int
	if z == x || z == y {
		// Ensure that we do not modify z if it's a parameter.
		zCoeffs = new(big.Int)
	} else {
		zCoeffs = &z.coeffs
		zCoeffs.SetInt64(0)
	}

	small, large := x, y
	if y.degree < x.degree {
		small, large = y, x
	}

	// Walk through small coeffs, shift large by the corresponding amount,
	// and accumulate in z.
	coeffs := new(big.Int).Set(&small.coeffs)
	zero := new(big.Int)
	for coeffs.Cmp(zero) > 0 {
		deg := calcDegree(coeffs)
		factor := new(big.Int).Lsh(&large.coeffs, deg)
		zCoeffs.Xor(zCoeffs, factor)

		// Prepare for next iteration.
		coeffs.SetBit(coeffs, int(deg), 0)
	}

	z.degree = calcDegree(zCoeffs)
	z.coeffs = *zCoeffs
	return z
}

func (d PublicKeyDigest) Xor(n PublicKeyDigest) PublicKeyDigest {
	var b, c big.Int
	b.SetBytes(d[:])
	c.SetBytes(n[:])
	b.Xor(&b, &c)
	var e PublicKeyDigest
	copy(e[:], b.Bytes())
	return e
}

func hashFiles(files []string) string {
	hash := new(big.Int)
	for _, file := range files {
		val := new(big.Int)
		val.SetBytes(hashFile(file))

		hash = hash.Xor(hash, val)
	}

	return fmt.Sprintf("%x", hash)
}

func binaryIntOp(x *big.Int, op token.Token, y *big.Int) interface{} {
	var z big.Int
	switch op {
	case token.ADD:
		return z.Add(x, y)
	case token.SUB:
		return z.Sub(x, y)
	case token.MUL:
		return z.Mul(x, y)
	case token.QUO:
		return z.Quo(x, y)
	case token.REM:
		return z.Rem(x, y)
	case token.AND:
		return z.And(x, y)
	case token.OR:
		return z.Or(x, y)
	case token.XOR:
		return z.Xor(x, y)
	case token.AND_NOT:
		return z.AndNot(x, y)
	case token.SHL:
		// The shift length must be uint, or untyped int and
		// convertible to uint.
		// TODO 32/64bit
		if y.BitLen() > 32 {
			panic("Excessive shift length")
		}
		return z.Lsh(x, uint(y.Int64()))
	case token.SHR:
		if y.BitLen() > 32 {
			panic("Excessive shift length")
		}
		return z.Rsh(x, uint(y.Int64()))
	case token.EQL:
		return x.Cmp(y) == 0
	case token.NEQ:
		return x.Cmp(y) != 0
	case token.LSS:
		return x.Cmp(y) < 0
	case token.LEQ:
		return x.Cmp(y) <= 0
	case token.GTR:
		return x.Cmp(y) > 0
	case token.GEQ:
		return x.Cmp(y) >= 0
	}
	panic("unreachable")
}

func bigIntXor(oldValues [][]byte, newValues [][]byte, w float64) (result [][]byte) {
	var sum *big.Int
	if oldValues != nil {
		sum = new(big.Int).SetBytes(oldValues[0])
		for _, b := range newValues {
			sum.Xor(sum, new(big.Int).Mul(common.DecodeBigInt(b), big.NewInt(int64(w))))
		}
	} else {
		sum = new(big.Int).Mul(new(big.Int).SetBytes(newValues[0]), big.NewInt(int64(w)))
		for _, b := range newValues[1:] {
			sum.Xor(sum, new(big.Int).Mul(common.DecodeBigInt(b), big.NewInt(int64(w))))
		}
	}
	return [][]byte{sum.Bytes()}
}

// LastUsable returns the last address in a given network.
func (ipv6 IPv6Addr) LastUsable() IPAddr {
	addr := new(big.Int)
	addr.Set(ipv6.Address)

	mask := new(big.Int)
	mask.Set(ipv6.Mask)

	negMask := new(big.Int)
	negMask.Xor(ipv6HostMask, mask)

	lastAddr := new(big.Int)
	lastAddr.And(addr, mask)
	lastAddr.Or(lastAddr, negMask)

	return IPv6Addr{
		Address: IPv6Address(lastAddr),
		Mask:    ipv6HostMask,
	}
}

func computeClientAuthenticator(hf HashFunc, grp *SRPGroup, username, salt, A, B, K []byte) []byte {
	//M = H(H(N) xor H(g), H(I), s, A, B, K)

	// H(N) xor H(g)
	hn := new(big.Int).SetBytes(quickHash(hf, grp.Prime.Bytes()))
	hg := new(big.Int).SetBytes(quickHash(hf, grp.Generator.Bytes()))
	hng := hn.Xor(hn, hg)

	hi := quickHash(hf, []byte(username))

	h := hf()
	h.Write(hng.Bytes())
	h.Write(hi)
	h.Write(salt)
	h.Write(A)
	h.Write(B)
	h.Write(K)
	return h.Sum(nil)
}

func binaryIntOp(x *big.Int, op token.Token, y *big.Int) interface{} {
	var z big.Int
	switch op {
	case token.ADD:
		return z.Add(x, y)
	case token.SUB:
		return z.Sub(x, y)
	case token.MUL:
		return z.Mul(x, y)
	case token.QUO:
		return z.Quo(x, y)
	case token.REM:
		return z.Rem(x, y)
	case token.AND:
		return z.And(x, y)
	case token.OR:
		return z.Or(x, y)
	case token.XOR:
		return z.Xor(x, y)
	case token.AND_NOT:
		return z.AndNot(x, y)
	case token.SHL:
		panic("unimplemented")
	case token.SHR:
		panic("unimplemented")
	case token.EQL:
		return x.Cmp(y) == 0
	case token.NEQ:
		return x.Cmp(y) != 0
	case token.LSS:
		return x.Cmp(y) < 0
	case token.LEQ:
		return x.Cmp(y) <= 0
	case token.GTR:
		return x.Cmp(y) > 0
	case token.GEQ:
		return x.Cmp(y) >= 0
	}
	panic("unreachable")
}

// binaryOpConst returns the result of the constant evaluation x op y;
// both operands must be of the same "kind" (boolean, numeric, or string).
// If intDiv is true, division (op == token.QUO) is using integer division
// (and the result is guaranteed to be integer) rather than floating-point
// division. Division by zero leads to a run-time panic.
//
func binaryOpConst(x, y interface{}, op token.Token, intDiv bool) interface{} {
	x, y = matchConst(x, y)

	switch x := x.(type) {
	case bool:
		y := y.(bool)
		switch op {
		case token.LAND:
			return x && y
		case token.LOR:
			return x || y
		default:
			unreachable()
		}

	case int64:
		y := y.(int64)
		switch op {
		case token.ADD:
			// TODO(gri) can do better than this
			if is63bit(x) && is63bit(y) {
				return x + y
			}
			return normalizeIntConst(new(big.Int).Add(big.NewInt(x), big.NewInt(y)))
		case token.SUB:
			// TODO(gri) can do better than this
			if is63bit(x) && is63bit(y) {
				return x - y
			}
			return normalizeIntConst(new(big.Int).Sub(big.NewInt(x), big.NewInt(y)))
		case token.MUL:
			// TODO(gri) can do better than this
			if is32bit(x) && is32bit(y) {
				return x * y
			}
			return normalizeIntConst(new(big.Int).Mul(big.NewInt(x), big.NewInt(y)))
		case token.REM:
			return x % y
		case token.QUO:
			if intDiv {
				return x / y
			}
			return normalizeRatConst(new(big.Rat).SetFrac(big.NewInt(x), big.NewInt(y)))
		case token.AND:
			return x & y
		case token.OR:
			return x | y
		case token.XOR:
			return x ^ y
		case token.AND_NOT:
			return x &^ y
		default:
			unreachable()
		}

	case *big.Int:
		y := y.(*big.Int)
		var z big.Int
		switch op {
		case token.ADD:
			z.Add(x, y)
		case token.SUB:
			z.Sub(x, y)
		case token.MUL:
			z.Mul(x, y)
		case token.REM:
			z.Rem(x, y)
		case token.QUO:
			if intDiv {
				z.Quo(x, y)
			} else {
				return normalizeRatConst(new(big.Rat).SetFrac(x, y))
			}
		case token.AND:
			z.And(x, y)
		case token.OR:
			z.Or(x, y)
		case token.XOR:
			z.Xor(x, y)
		case token.AND_NOT:
			z.AndNot(x, y)
		default:
			unreachable()
		}
		return normalizeIntConst(&z)

	case *big.Rat:
		y := y.(*big.Rat)
		var z big.Rat
		switch op {
		case token.ADD:
			z.Add(x, y)
		case token.SUB:
			z.Sub(x, y)
//.........这里部分代码省略.........

func nxor(z *big.Int, x *big.Int, y *big.Int) *big.Int {
	z.Xor(x, y)
	return z.Not(z)
}

func xor(z *big.Int, x *big.Int, y *big.Int) *big.Int { return z.Xor(x, y) }

//.........这里部分代码省略.........
				stack.push(common.BigTrue)
			} else {
				stack.push(common.BigFalse)
			}

		case EQ:
			x, y := stack.pop(), stack.pop()

			// x == y
			if x.Cmp(y) == 0 {
				stack.push(common.BigTrue)
			} else {
				stack.push(common.BigFalse)
			}
		case ISZERO:
			x := stack.pop()
			if x.Cmp(common.BigFalse) > 0 {
				stack.push(common.BigFalse)
			} else {
				stack.push(common.BigTrue)
			}

		case AND:
			x, y := stack.pop(), stack.pop()

			stack.push(base.And(x, y))
		case OR:
			x, y := stack.pop(), stack.pop()

			stack.push(base.Or(x, y))
		case XOR:
			x, y := stack.pop(), stack.pop()

			stack.push(base.Xor(x, y))
		case BYTE:
			th, val := stack.pop(), stack.pop()

			if th.Cmp(big.NewInt(32)) < 0 {
				byt := big.NewInt(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))

				base.Set(byt)
			} else {
				base.Set(common.BigFalse)
			}

			stack.push(base)
		case ADDMOD:
			x := stack.pop()
			y := stack.pop()
			z := stack.pop()

			if z.Cmp(Zero) > 0 {
				add := new(big.Int).Add(x, y)
				base.Mod(add, z)

				base = U256(base)
			}

			stack.push(base)
		case MULMOD:
			x := stack.pop()
			y := stack.pop()
			z := stack.pop()

			if z.Cmp(Zero) > 0 {
				mul := new(big.Int).Mul(x, y)

//.........这里部分代码省略.........
		case EQ:
			x, y := stack.pop(), stack.pop()
			self.Printf(" %v == %v", y, x)

			// x == y
			if x.Cmp(y) == 0 {
				stack.push(common.BigTrue)
			} else {
				stack.push(common.BigFalse)
			}
		case ISZERO:
			x := stack.pop()
			if x.Cmp(common.BigFalse) > 0 {
				stack.push(common.BigFalse)
			} else {
				stack.push(common.BigTrue)
			}

			// 0x10 range
		case AND:
			x, y := stack.pop(), stack.pop()
			self.Printf(" %v & %v", y, x)

			stack.push(base.And(x, y))
		case OR:
			x, y := stack.pop(), stack.pop()
			self.Printf(" %v | %v", x, y)

			stack.push(base.Or(x, y))
		case XOR:
			x, y := stack.pop(), stack.pop()
			self.Printf(" %v ^ %v", x, y)

			stack.push(base.Xor(x, y))
		case BYTE:
			th, val := stack.pop(), stack.pop()

			if th.Cmp(big.NewInt(32)) < 0 {
				byt := big.NewInt(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))

				base.Set(byt)
			} else {
				base.Set(common.BigFalse)
			}

			self.Printf(" => 0x%x", base.Bytes())

			stack.push(base)
		case ADDMOD:
			x := stack.pop()
			y := stack.pop()
			z := stack.pop()

			if z.Cmp(Zero) > 0 {
				add := new(big.Int).Add(x, y)
				base.Mod(add, z)

				base = U256(base)
			}

			self.Printf(" %v + %v %% %v = %v", x, y, z, base)

			stack.push(base)
		case MULMOD:
			x := stack.pop()
			y := stack.pop()

//.........这里部分代码省略.........
			// x == y
			if x.Cmp(y) == 0 {
				stack.Push(ethutil.BigTrue)
			} else {
				stack.Push(ethutil.BigFalse)
			}
		case NOT:
			require(1)
			x := stack.Pop()
			if x.Cmp(ethutil.BigFalse) > 0 {
				stack.Push(ethutil.BigFalse)
			} else {
				stack.Push(ethutil.BigTrue)
			}

			// 0x10 range
		case AND:
			require(2)
			x, y := stack.Popn()
			self.Printf(" %v & %v", y, x)

			stack.Push(base.And(y, x))
		case OR:
			require(2)
			x, y := stack.Popn()
			self.Printf(" %v | %v", y, x)

			stack.Push(base.Or(y, x))
		case XOR:
			require(2)
			x, y := stack.Popn()
			self.Printf(" %v ^ %v", y, x)

			stack.Push(base.Xor(y, x))
		case BYTE:
			require(2)
			val, th := stack.Popn()
			if th.Cmp(big.NewInt(32)) < 0 && th.Cmp(big.NewInt(int64(len(val.Bytes())))) < 0 {
				byt := big.NewInt(int64(ethutil.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
				stack.Push(byt)

				self.Printf(" => 0x%x", byt.Bytes())
			} else {
				stack.Push(ethutil.BigFalse)
			}
		case ADDMOD:
			require(3)

			x := stack.Pop()
			y := stack.Pop()
			z := stack.Pop()

			base.Add(x, y)
			base.Mod(base, z)

			ensure256(base)

			self.Printf(" = %v", base)

			stack.Push(base)
		case MULMOD:
			require(3)

			x := stack.Pop()
			y := stack.Pop()
			z := stack.Pop()

// Post-order traversal, equivalent to postfix notation.
func Eval(node interface{}) (*big.Int, error) {
	switch nn := node.(type) {
	case *ast.BinaryExpr:
		z := new(big.Int)
		x, xerr := Eval(nn.X)
		if xerr != nil {
			return nil, xerr
		}
		y, yerr := Eval(nn.Y)
		if yerr != nil {
			return nil, yerr
		}
		switch nn.Op {
		case token.ADD:
			return z.Add(x, y), nil
		case token.SUB:
			return z.Sub(x, y), nil
		case token.MUL:
			return z.Mul(x, y), nil
		case token.QUO:
			if y.Sign() == 0 { // 0 denominator
				return nil, DivideByZero
			}
			return z.Quo(x, y), nil
		case token.REM:
			if y.Sign() == 0 {
				return nil, DivideByZero
			}
			return z.Rem(x, y), nil
		case token.AND:
			return z.And(x, y), nil
		case token.OR:
			return z.Or(x, y), nil
		case token.XOR:
			return z.Xor(x, y), nil
		case token.SHL:
			if y.Sign() < 0 { // negative shift
				return nil, NegativeShift
			}
			return z.Lsh(x, uint(y.Int64())), nil
		case token.SHR:
			if y.Sign() < 0 {
				return nil, NegativeShift
			}
			return z.Rsh(x, uint(y.Int64())), nil
		case token.AND_NOT:
			return z.AndNot(x, y), nil
		default:
			return nil, UnknownOpErr
		}
	case *ast.UnaryExpr:
		var z *big.Int
		var err error
		if z, err = Eval(nn.X); err != nil {
			return nil, err
		}
		switch nn.Op {
		case token.SUB: // -x
			return z.Neg(z), nil
		case token.XOR: // ^x
			return z.Not(z), nil
		case token.ADD: // +x (useless)
			return z, nil
		}
	case *ast.BasicLit:
		z := new(big.Int)
		switch nn.Kind {
		case token.INT:
			z.SetString(nn.Value, 0)
			return z, nil
		default:
			return nil, UnknownLitErr
		}
	case *ast.ParenExpr:
		z, err := Eval(nn.X)
		if err != nil {
			return nil, err
		}
		return z, nil
	case *ast.CallExpr:
		ident, ok := nn.Fun.(*ast.Ident)
		if !ok {
			return nil, UnknownTokenErr // quarter to four am; dunno correct error
		}
		var f Func
		f, ok = FuncMap[ident.Name]
		if !ok {
			return nil, UnknownFuncErr
		}
		var aerr error
		args := make([]*big.Int, len(nn.Args))
		for i, a := range nn.Args {
			if args[i], aerr = Eval(a); aerr != nil {
				return nil, aerr
			}
		}
		x, xerr := f(args...)
		if xerr != nil {
			return nil, xerr
//.........这里部分代码省略.........