scusi a révisé ce gist 6 months ago. Aller à la révision
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Florian Walther a révisé ce gist 8 years ago. Aller à la révision
Aucun changement
Florian Walther a révisé ce gist 8 years ago. Aller à la révision
1 file changed, 53 insertions
xor.go(fichier créé)
| @@ -0,0 +1,53 @@ | |||
| 1 | + | package main | |
| 2 | + | ||
| 3 | + | import ( | |
| 4 | + | "container/ring" | |
| 5 | + | "flag" | |
| 6 | + | "io/ioutil" | |
| 7 | + | "log" | |
| 8 | + | ) | |
| 9 | + | ||
| 10 | + | var keyFile string | |
| 11 | + | var keyString string | |
| 12 | + | var inFile string | |
| 13 | + | var outFile string | |
| 14 | + | var keyData []byte | |
| 15 | + | var err error | |
| 16 | + | ||
| 17 | + | func init() { | |
| 18 | + | flag.StringVar(&keyFile, "k", "key", "key file to use") | |
| 19 | + | flag.StringVar(&keyString, "s", "", "key to use, as string") | |
| 20 | + | flag.StringVar(&inFile, "f", "file", "file encrypt/decrypt") | |
| 21 | + | flag.StringVar(&outFile, "o", "out", "output file") | |
| 22 | + | } | |
| 23 | + | ||
| 24 | + | func check(err error) { | |
| 25 | + | if err != nil { | |
| 26 | + | log.Fatal(err) | |
| 27 | + | } | |
| 28 | + | } | |
| 29 | + | ||
| 30 | + | func main() { | |
| 31 | + | flag.Parse() | |
| 32 | + | if keyString == "" { | |
| 33 | + | // load key file | |
| 34 | + | keyData, err = ioutil.ReadFile(keyFile) | |
| 35 | + | check(err) | |
| 36 | + | } else { | |
| 37 | + | keyData = []byte(keyString) | |
| 38 | + | } | |
| 39 | + | // setup ring buffer with key data | |
| 40 | + | r := ring.New(len(keyData)) | |
| 41 | + | for i := 0; i < r.Len(); i++ { | |
| 42 | + | r.Value = keyData[i] | |
| 43 | + | r = r.Next() | |
| 44 | + | } | |
| 45 | + | // load encrypted data from file | |
| 46 | + | data, err := ioutil.ReadFile(inFile) | |
| 47 | + | check(err) | |
| 48 | + | for i := 0; i < len(data); i++ { // foreach byte of data | |
| 49 | + | data[i] = r.Value.(byte) ^ data[i] // xor data byte with current ring element | |
| 50 | + | r = r.Next() // move ring forward | |
| 51 | + | } | |
| 52 | + | ioutil.WriteFile(outFile, data, 0700) | |
| 53 | + | } | |
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