Implemented AR PoW

pow/ar/ops.go

@@ -0,0 +1,54 @@
+package ar
+
+import "math/big"
+
+const lenops int64 = 9
+
+type OpsFunc func(a, b *big.Int) *big.Int
+
+var ops [lenops]OpsFunc
+
+func init() {
+	ops[0] = Add
+	ops[1] = Mul
+	ops[2] = Mod
+	ops[3] = Xor
+	ops[4] = And
+	ops[5] = Or
+	ops[6] = Sub1
+	ops[7] = XorSub
+	ops[8] = Rsh
+}
+
+func Add(x, y *big.Int) *big.Int {
+	return new(big.Int).Add(x, y)
+}
+func Mul(x, y *big.Int) *big.Int {
+	return new(big.Int).Mul(x, y)
+}
+func Mod(x, y *big.Int) *big.Int {
+	return new(big.Int).Mod(x, y)
+}
+func Xor(x, y *big.Int) *big.Int {
+	return new(big.Int).Xor(x, y)
+}
+func And(x, y *big.Int) *big.Int {
+	return new(big.Int).And(x, y)
+}
+func Or(x, y *big.Int) *big.Int {
+	return new(big.Int).Or(x, y)
+}
+func Sub1(x, y *big.Int) *big.Int {
+	a := big.NewInt(-1)
+	a.Sub(a, x)
+
+	return a
+}
+func XorSub(x, y *big.Int) *big.Int {
+	t := Sub1(x, nil)
+
+	return t.Xor(t, y)
+}
+func Rsh(x, y *big.Int) *big.Int {
+	return new(big.Int).Rsh(x, uint(y.Uint64()%64))
+}