init

go.mod

@@ -0,0 +1,3 @@
+module kumoly.io/lib/xorencrypt
+
+go 1.17

xorencrypt.go

@@ -0,0 +1,25 @@
+package xorencrypt
+
+import "encoding/base64"
+
+func Decrypt(msg, key string) (string, error) {
+	deb64, err := base64.StdEncoding.DecodeString(msg)
+	if err != nil {
+		return "", err
+	}
+	dec := xor(deb64, []byte(key))
+	return string(dec), nil
+}
+
+func Encrypt(msg, key string) string {
+	enc := xor([]byte(msg), []byte(key))
+	return base64.StdEncoding.EncodeToString(enc)
+}
+
+func xor(msg, key []byte) []byte {
+	ret := make([]byte, len(msg))
+	for i := 0; i < len(msg); i++ {
+		ret[i] = msg[i] ^ key[i%len(key)]
+	}
+	return ret
+}

xorencrypt_test.go

@@ -0,0 +1,25 @@
+package xorencrypt
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestXOR(t *testing.T) {
+	msg := "test"
+	key := "key"
+	enc := xor([]byte(msg), []byte(key))
+	dec := xor([]byte(enc), []byte(key))
+	fmt.Printf("%s -> %d -> %s\n", msg, enc, dec)
+}
+
+func TestEncrypt(t *testing.T) {
+	msg := "test"
+	key := "key"
+	enc := Encrypt(msg, key)
+	dec, _ := Decrypt(enc, key)
+	fmt.Printf("%s -> %s -> %s\n", msg, enc, dec)
+
+	decErr, _ := Decrypt(enc, "wrongKey")
+	fmt.Printf("%s -> %s -> %s\n", msg, enc, decErr)
+}