102 lines
1.7 KiB
Go
102 lines
1.7 KiB
Go
package main
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import (
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"archive/zip"
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"crypto/aes"
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"crypto/cipher"
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"crypto/sha256"
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"flag"
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"io"
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"log"
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"os"
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"strings"
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"sync"
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)
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func main() {
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password := flag.String("password", "", "photok password")
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backupFile := flag.String("file", "", "path to backup file")
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numWorkers := flag.Int("worker", 10, "number of workers")
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flag.Parse()
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var wg sync.WaitGroup
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jobs := make(chan *zip.File)
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for i := 0; i < *numWorkers; i++ {
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wg.Add(1)
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go worker(*password, jobs, &wg)
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}
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r, err := zip.OpenReader(*backupFile)
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if err != nil {
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log.Fatal(err)
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}
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defer r.Close()
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for _, f := range r.File {
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if !strings.HasSuffix(f.Name, ".tn") && strings.HasSuffix(f.Name, ".photok") {
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jobs <- f
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}
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}
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close(jobs)
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wg.Wait()
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}
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func worker(password string, jobs <-chan *zip.File, wg *sync.WaitGroup) {
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defer wg.Done()
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key := photokKey(password)
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iv := photokIV(password)
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block, err := aes.NewCipher(key)
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if err != nil {
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log.Fatal(err)
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}
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aesgcm, err := cipher.NewGCMWithNonceSize(block, 16)
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if err != nil {
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log.Fatal(err)
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}
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for file := range jobs {
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reader, err := file.Open()
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if err != nil {
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log.Fatal(err)
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}
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ciphertext, err := io.ReadAll(reader)
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if err != nil {
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log.Fatal(err)
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}
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plaintext, err := aesgcm.Open(nil, iv, ciphertext, nil)
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if err != nil {
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log.Fatal(err)
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}
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if err := os.WriteFile(file.Name+".plaintext", plaintext, 0o644); err != nil {
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log.Fatal(err)
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}
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}
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}
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func photokKey(password string) []byte {
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h := sha256.New()
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h.Write([]byte(password))
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return h.Sum(nil)
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}
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func photokIV(password string) []byte {
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iv := make([]byte, 16)
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for i := 0; i < 16 && i < len(password); i++ {
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iv[i] = password[i]
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}
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return iv
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}
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