1+ package main
2+ 3+ import (
4+ "fmt"
5+ "os"
6+ )
7+ 8+ func cipher (text string , direction int ) string {
9+ 10+ shift , offset := rune (3 ), rune (26 )
11+ runes := []rune (text )
12+ 13+ for index , char := range runes {
14+ switch direction {
15+ case - 1 : // encoding
16+ if char >= 'a' + shift && char <= 'z' ||
17+ char >= 'A' + shift && char <= 'Z' {
18+ char = char - shift
19+ } else if char >= 'a' && char < 'a' + shift ||
20+ char >= 'A' && char < 'A' + shift {
21+ char = char - shift + offset
22+ }
23+ case + 1 : // decoding
24+ if char >= 'a' && char <= 'z' - shift ||
25+ char >= 'A' && char <= 'Z' - shift {
26+ char = char + shift
27+ } else if char > 'z' - shift && char <= 'z' ||
28+ char > 'Z' - shift && char <= 'Z' {
29+ char = char + shift - offset
30+ }
31+ }
32+ runes [index ] = char
33+ }
34+ return string (runes )
35+ }
36+ 37+ func encode (text string ) string { return cipher (text , - 1 ) }
38+ func decode (text string ) string { return cipher (text , + 1 ) }
39+ 40+ func main () {
41+ sec := os .Args [1 ]
42+ fmt .Println ("[+] Clear text: " + sec )
43+ encoded := encode (sec )
44+ fmt .Println ("[+] Encoded: " + encoded )
45+ decoded := decode (encoded )
46+ fmt .Println ("[+] Decoded: " + decoded )
47+ }
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