Add generate random key

generate/generate.go

@@ -24,6 +24,25 @@ func GetRandomString(n int) (string, error) {
 	return string(buffer), nil
 }
 
+// GetRandomKey 取得隨機金鑰
+func GetRandomKey(n int) (string, error) {
+	const alphaNum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz~!@#$%^&*()-_=+"
+
+	buffer := make([]byte, n)
+	max := big.NewInt(int64(len(alphaNum)))
+
+	for i := 0; i < n; i++ {
+		index, err := randomInt(max)
+		if err != nil {
+			return "", err
+		}
+
+		buffer[i] = alphaNum[index]
+	}
+
+	return string(buffer), nil
+}
+
 func randomInt(max *big.Int) (int, error) {
 	random, err := rand.Int(rand.Reader, max)
 	if err != nil {