mirror of https://github.com/yeka/zip.git
Playing around
This commit is contained in:
yeka
parent
fcc3c52422
commit
9a620c6cd3
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@ -443,6 +443,12 @@ func (h *FileHeader) SetPassword(password string) {
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}
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}
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func (h *FileHeader) SetDecryptionPassword(password string) {
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h.password = func() []byte {
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return []byte(password)
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}
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}
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// PasswordFn is a function that returns the password
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// as a byte slice
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type passwordFn func() []byte
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@ -457,6 +463,6 @@ func (w *Writer) Encrypt(name string, password string) (io.Writer, error) {
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Name: name,
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Method: Deflate,
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}
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fh.SetPassword(password)
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fh.SetDecryptionPassword(password)
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return w.CreateHeader(fh)
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}
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16
reader.go
16
reader.go
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@ -143,14 +143,21 @@ func (f *File) Open() (rc io.ReadCloser, err error) {
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size := int64(f.CompressedSize64)
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var r io.Reader
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rr := io.NewSectionReader(f.zipr, f.headerOffset+bodyOffset, size)
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// check for encryption
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if f.IsEncrypted() {
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if r, err = newDecryptionReader(rr, f); err != nil {
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if f.ae == 0 {
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fmt.Printf("CRC32: %X ---- %v\n", f.CRC32, f.CRC32)
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if r, err = ZipCryptoDecryptor(rr, f.password()); err != nil {
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return
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}
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} else if r, err = newDecryptionReader(rr, f); err != nil {
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return
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}
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} else {
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r = rr
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}
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dcomp := decompressor(f.Method)
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if dcomp == nil {
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err = ErrAlgorithm
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@ -254,14 +261,21 @@ func readDirectoryHeader(f *File, r io.Reader) error {
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f.CreatorVersion = b.uint16()
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f.ReaderVersion = b.uint16()
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f.Flags = b.uint16()
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fmt.Printf("FLAG: %X\n", f.Flags)
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f.Method = b.uint16()
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fmt.Printf("METHOD: %X\n", f.Method)
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f.ModifiedTime = b.uint16()
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f.ModifiedDate = b.uint16()
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f.CRC32 = b.uint32()
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fmt.Printf("Directory CRC: %X\n", f.CRC32)
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f.CompressedSize = b.uint32()
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f.UncompressedSize = b.uint32()
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f.CompressedSize64 = uint64(f.CompressedSize)
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f.UncompressedSize64 = uint64(f.UncompressedSize)
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fmt.Printf("ZIP Size 1: %v\n", f.CompressedSize)
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fmt.Printf("ZIP Size 2: %v\n", f.CompressedSize64)
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fmt.Printf("File Size 1: %v\n", f.UncompressedSize)
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fmt.Printf("File Size 2: %v\n", f.UncompressedSize64)
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filenameLen := int(b.uint16())
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extraLen := int(b.uint16())
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commentLen := int(b.uint16())
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@ -0,0 +1,32 @@
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package main
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import "fmt"
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type Int int
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func (i *Int) Incr(n int) Int {
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*i = (*i) + Int(n)
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return *i
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}
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func main() {
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i := Int(10)
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i.Incr(12)
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fmt.Println(i)
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b := &Bytes{b: []byte{1, 2, 3, 4, 5}, i: 0}
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c := b.Get(0, 3)
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c[1] = 11
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fmt.Println(b)
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fmt.Println(c)
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j := &Bytes{b: []byte{1, 2, 3, 4, 5}, i: 0}
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k := j.IGet(3)
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l := j.IGet(2)
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k[0] = 10
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l[0] = 11
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fmt.Println(j)
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fmt.Println(k)
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fmt.Println(l)
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}
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@ -0,0 +1,544 @@
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package main
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import (
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zip2 "github.com/yeka/zip"
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"bytes"
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"os"
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"io"
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"fmt"
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"archive/zip"
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"log"
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"hash/crc32"
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"encoding/binary"
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"io/ioutil"
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)
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func main() {
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//fmt.Printf("%X\n", crc32.Update(0, crc32.IEEETable, []byte{0}))
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//return
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password := "zipcrypto"
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new(ZipReader).FromBytes(createzip(password), password)
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new(ZipReader).Open("java2.zip", password) // FA176C7F
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os.Remove("myzip/test1.zip")
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ioutil.WriteFile("myzip/test1.zip", createzip(password), os.ModePerm)
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return
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//z.Open("java2.zip", "zipcrypto") // FA176C7F
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//z.Open("java.zip", "123")
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//z.Open("a.zip")
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//z.Open("test.zip")
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fmt.Println("=======================================")
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return
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//unknown1()
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//show("java.zip", "zipcrypto")
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zipunzip()
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return
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fmt.Printf("%X\n", 878082192)
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show("banyak.zip", "123")
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//show("pass.zip", "zipcrypto")
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//show("java.zip", "zipcrypto")
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//show("a.zip", "aa") // Incorrect password
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//show("test.zip", "")
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fmt.Printf("%b\n", zip2.Crc32update(0, 0))
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h := crc32.NewIEEE()
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h.Write([]byte{0})
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fmt.Printf("%b\n", h.Sum32())
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fmt.Printf("%b\n", crc32.Update(0, crc32.IEEETable, []byte{0}))
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}
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func play1() {
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de := []byte("hello")
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//e := zip.NewZipCrypto([]byte("Passwordnya panjang banget kk"))
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//en := e.EncryptMessage([]byte("Hello Worlds Muahaha"))
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//d := zip.NewZipCrypto([]byte("Passwordnya panjang banget kk"))
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//de = d.DecryptMessage(en)
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fmt.Println(string(de))
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os.Exit(0)
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buf := new(bytes.Buffer)
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//a := zip.NewWriter(buf)
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//w, _ := a.Create("a.txt")
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//w.Write([]byte(`Hello World`))
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//a.Close()
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f, _ := os.Create("temp/test.zip")
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io.Copy(f, buf)
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f.Close()
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_ = zip.Deflate
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}
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func show(filename string, password string) {
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r, err := zip2.OpenReader(filename)
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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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fmt.Printf("------ %s ------\n", f.Name)
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f.SetDecryptionPassword(password)
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rc, err := f.Open()
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if err != nil {
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fmt.Println("Opening error")
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log.Print(err)
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continue
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}
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buf := new(bytes.Buffer)
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if _, err = io.Copy(buf, rc); err != nil {
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fmt.Println("buffering error")
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log.Print(err)
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continue
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}
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fmt.Printf("Size: %d\nContent:\n", buf.Len())
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fmt.Println(string(buf.Bytes()))
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//fmt.Println(buf.Bytes())
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rc.Close()
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fmt.Println()
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fmt.Println()
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}
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}
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func createzip(password string) []byte {
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fmt.Printf("\n\n========================== Writing ========================== \n\n")
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mydata, _ := ioutil.ReadFile("a.java")
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b := new(bytes.Buffer)
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z := zip2.NewWriter(b)
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//w, _ := z.Create("a.java")
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w, _ := z.Encrypt("a.java", password)
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fmt.Println(w.Write(mydata))
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z.Close()
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return b.Bytes()
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}
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func zipunzip() {
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fmt.Printf("\n\n========================== Writing ========================== \n\n")
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mydata := []byte(`Hello World`)
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password := "golang"
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b := new(bytes.Buffer)
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z := zip2.NewWriter(b)
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//w, _ := z.Create("a.txt")
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w, _ := z.Encrypt("a.txt", password)
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fmt.Println(w.Write(mydata))
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z.Close()
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fmt.Printf("\n\n========================== Reading ========================== \n\n")
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rz, _ := zip2.NewReader(bytes.NewReader(b.Bytes()), int64(b.Len()))
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rz.File[0].SetDecryptionPassword(password)
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r, _ := rz.File[0].Open()
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myresult := new(bytes.Buffer)
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io.Copy(myresult, r)
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r.Close()
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fmt.Println(mydata)
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fmt.Println(myresult.Bytes())
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fmt.Println(0 == bytes.Compare(mydata, myresult.Bytes()))
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}
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func unknown1() {
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hello := []byte("Hello world\n")
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b := new(bytes.Buffer)
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l := &zipwriterboongan{b}
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c := &zipwriterboongan{l}
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//m := &minues{l}
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//c := &minues2{m}
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//
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////i := io.MultiWriter(b, m, l, c)
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//c.Write(hello)
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c.Write(hello)
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fmt.Println(string(b.Bytes()))
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}
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type zipwriterboongan struct {
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w io.Writer
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}
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func (m *zipwriterboongan) Write(p []byte) (i int, err error) {
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temp := make([]byte, len(p))
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for i, b := range p {
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temp[i] = b ^ 0xFF
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}
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m.w.Write(temp)
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return
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}
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type ftpwriterboongan struct {
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w io.Writer
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}
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func (m *ftpwriterboongan) Write(p []byte) (i int, err error) {
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temp := make([]byte, len(p))
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for i, b := range p {
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temp[i] = b ^ 0xFF
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}
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m.w.Write(temp)
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return
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}
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type ZipReader struct {
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b *Bytes
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password []byte
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files []*ZipFile
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central_dir []*ZipCentralDirectory
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dir_end *ZipDirectoryEnd
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}
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type ZipFile struct {
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zip *ZipReader
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header *ZipFileHeader
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data *ZipFileData
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descriptor *ZipFileDescriptor
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}
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func (zf *ZipFile) init(offset, datasize uint64) {
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h := &ZipFileHeader{file: zf}
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h.init(offset)
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f := &ZipFileData{file: zf}
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f.content = zf.zip.b.IGet(datasize)
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e := &ZipFileDescriptor{file: zf}
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if u16x(h.general_purpose_bit_flag) & 8 > 0 {
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e.init(zf.zip.b.Pos())
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}
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zf.header = h
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zf.data = f
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zf.descriptor = e
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}
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type ZipFileHeader struct {
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file *ZipFile
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local_file_header_signature []byte
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version_needed_to_extract []byte
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general_purpose_bit_flag []byte
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compression_method []byte
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last_mod_file_time []byte
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last_mod_file_date []byte
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crc_32 []byte
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compressed_size []byte
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uncompressed_size []byte
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filename_length []byte
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extra_field_length []byte
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filename []byte
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extra_field []byte
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}
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func (fh *ZipFileHeader) init(offset uint64) {
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b := fh.file.zip.b
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b.Offset(offset)
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fh.local_file_header_signature = b.IGet(4)
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fh.version_needed_to_extract = b.IGet(2)
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fh.general_purpose_bit_flag = b.IGet(2)
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fh.compression_method = b.IGet(2)
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fh.last_mod_file_time = b.IGet(2)
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fh.last_mod_file_date = b.IGet(2)
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fh.crc_32 = b.IGet(4)
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fh.compressed_size = b.IGet(4)
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fh.uncompressed_size = b.IGet(4)
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fh.filename_length = b.IGet(2)
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fh.extra_field_length = b.IGet(2)
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fh.filename = b.IGet(u16x(fh.filename_length))
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fh.extra_field = b.IGet(u16x(fh.extra_field_length))
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}
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type ZipFileData struct {
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file *ZipFile
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content []byte
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}
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type ZipFileDescriptor struct {
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file *ZipFile
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signature []byte
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crc_32 []byte
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compressed_size []byte
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uncompressed_size []byte
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}
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func (fd *ZipFileDescriptor) init(offset uint64) {
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b := fd.file.zip.b
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b.Offset(offset)
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sig := b.IGet(4)
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if u32x(sig) == 0x08074b50 {
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fd.signature = sig
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fd.crc_32 = b.IGet(4)
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} else {
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fd.crc_32 = sig
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}
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fd.compressed_size = b.IGet(4)
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fd.uncompressed_size = b.IGet(4)
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}
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type ZipCentralDirectory struct {
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zip *ZipReader
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central_file_header_signature []byte
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version_made_by []byte
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version_needed_to_extrac []byte
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general_purpose_bit_flag []byte
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compression_method []byte
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last_mod_file_time []byte
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last_mod_file_date []byte
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crc_32 []byte
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compressed_size []byte
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uncompressed_size []byte
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filename_length []byte
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extra_field_length []byte
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file_comment_length []byte
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disk_num_start []byte
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internal_file_attr []byte
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external_file_attr []byte
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local_header_relative_offset []byte
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filename []byte
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extra_field []byte
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file_comment []byte
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}
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func (cd *ZipCentralDirectory) init(offset uint64) (size uint64) {
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cd.zip.b.Offset(offset)
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cd.central_file_header_signature = cd.zip.b.IGet(4)
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cd.version_made_by = cd.zip.b.IGet(2)
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cd.version_needed_to_extrac = cd.zip.b.IGet(2)
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cd.general_purpose_bit_flag = cd.zip.b.IGet(2)
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cd.compression_method = cd.zip.b.IGet(2)
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cd.last_mod_file_time = cd.zip.b.IGet(2)
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cd.last_mod_file_date = cd.zip.b.IGet(2)
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cd.crc_32 = cd.zip.b.IGet(4)
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cd.compressed_size = cd.zip.b.IGet(4)
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cd.uncompressed_size = cd.zip.b.IGet(4)
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cd.filename_length = cd.zip.b.IGet(2)
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cd.extra_field_length = cd.zip.b.IGet(2)
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cd.file_comment_length = cd.zip.b.IGet(2)
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cd.disk_num_start = cd.zip.b.IGet(2)
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cd.internal_file_attr = cd.zip.b.IGet(2)
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cd.external_file_attr = cd.zip.b.IGet(4)
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cd.local_header_relative_offset = cd.zip.b.IGet(4)
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cd.filename = cd.zip.b.IGet(u16x(cd.filename_length))
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cd.extra_field = cd.zip.b.IGet(u16x(cd.extra_field_length))
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cd.file_comment = cd.zip.b.IGet(u16x(cd.file_comment_length))
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size = 46 + u16x(cd.filename_length) + u16x(cd.extra_field_length) + u16x(cd.file_comment_length)
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return
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}
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type ZipDirectoryEnd struct {
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zip *ZipReader
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signature []byte
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disknum []byte
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disknum_start_of_central_directory []byte
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entries_in_this_disk []byte
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num_of_entries []byte
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size_of_central_dir []byte
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offset_of_central_dir []byte
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zipfile_comment_length []byte
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zipfile_comment []byte
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}
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func (zde *ZipDirectoryEnd) init(offset uint64) {
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zde.zip.b.Offset(offset)
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zde.signature = zde.zip.b.IGet(4)
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zde.disknum = zde.zip.b.IGet(2)
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zde.disknum_start_of_central_directory = zde.zip.b.IGet(2)
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zde.entries_in_this_disk = zde.zip.b.IGet(2)
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zde.num_of_entries = zde.zip.b.IGet(2)
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zde.size_of_central_dir = zde.zip.b.IGet(4)
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zde.offset_of_central_dir = zde.zip.b.IGet(4)
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zde.zipfile_comment_length = zde.zip.b.IGet(2)
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zde.zipfile_comment = zde.zip.b.IGet(u16x(zde.zipfile_comment_length))
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}
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func (z *ZipReader) FromBytes(buf []byte, password string) {
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z.b = &Bytes{buf, 0}
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z.password = []byte(password)
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z.Init()
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}
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func (z *ZipReader) Open(filename string, password string) {
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buf, _ := ioutil.ReadFile(filename)
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z.FromBytes(buf, password)
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}
|
||||
|
||||
func (z *ZipReader) Init() {
|
||||
// First find Directory End
|
||||
var i uint64
|
||||
for i = uint64(len(z.b.b)) - 22; i >= 0; i-- {
|
||||
if z.b.BGet(i, 4).I64() == 0x06054b50 {
|
||||
z.dir_end = &ZipDirectoryEnd{zip: z}
|
||||
z.dir_end.init(i)
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
// Read all Central Directory Header
|
||||
central_dir_offset := u16x(z.dir_end.offset_of_central_dir)
|
||||
for i = 0; i < u16x(z.dir_end.num_of_entries); i++ {
|
||||
cdfh := &ZipCentralDirectory{zip: z}
|
||||
central_dir_offset += cdfh.init(central_dir_offset)
|
||||
z.central_dir = append(z.central_dir, cdfh)
|
||||
}
|
||||
|
||||
for i = 0; i < u16x(z.dir_end.num_of_entries); i++ {
|
||||
zf := &ZipFile{zip: z}
|
||||
zf.init(u32x(z.central_dir[i].local_header_relative_offset), u32x(z.central_dir[i].compressed_size))
|
||||
z.files = append(z.files, zf)
|
||||
}
|
||||
|
||||
fmt.Printf("%0 X\n", z.files[0].header)
|
||||
fmt.Printf("%0 X\n", z.files[0].descriptor)
|
||||
// PlayGround
|
||||
//fmt.Printf("%v\n", z.files[0].data.content)
|
||||
//zc := zip2.NewZipCrypto(z.password)
|
||||
//buf := zc.DecryptMessage(z.files[0].data.content)
|
||||
////fmt.Printf("%v\n", buf)
|
||||
//rc := flate.NewReader(bytes.NewBuffer(buf[12:]))
|
||||
//defer rc.Close()
|
||||
//res, err := ioutil.ReadAll(rc)
|
||||
//if err != nil {
|
||||
// fmt.Println(err.Error())
|
||||
//}
|
||||
//fmt.Printf("%v\n", string(res))
|
||||
|
||||
//fmt.Printf("---------------- %v ----------------\n", string(h.filename))
|
||||
//fmt.Printf("Signature: %02X\n", h.local_file_header_signature)
|
||||
//fmt.Printf("Version: %v\n", h.version_needed_to_extract)
|
||||
//fmt.Printf("General Purpose Bit Flag: %08b\n", h.general_purpose_bit_flag)
|
||||
//fmt.Printf("Compression Method: %v\n", h.compression_method)
|
||||
//fmt.Printf("CRC32: %0 X, Compressed: %v, Uncompressed: %v\n", h.crc_32, u16x(h.compressed_size), u16x(h.uncompressed_size))
|
||||
//fmt.Printf("FileName Length: %v\n", u16x(h.filename_length))
|
||||
//fmt.Printf("ExtraField Length: %v\n", u16x(h.extra_field_length))
|
||||
//fmt.Printf("ExtraField: %0 X\n", h.extra_field)
|
||||
//if u16x(h.general_purpose_bit_flag) & 8 > 0 {
|
||||
// crc32 := z.b.IGet(4)
|
||||
// if u32x(crc32) == 0x08074b50 {
|
||||
// // Signature may or may not be there
|
||||
// crc32 = z.b.IGet(4)
|
||||
// }
|
||||
// csize := z.b.IGet(4)
|
||||
// usize := z.b.IGet(4)
|
||||
// fmt.Printf("DataDescriptor:\nCRC32: %0 X, Compressed: %v, Uncompressed: %v, Next Signature: %X\n", crc32, u16x(csize), u16x(usize), z.b.IGet(4))
|
||||
//}
|
||||
//
|
||||
//crcbuf := make([]byte, 4)
|
||||
//crcbuf[3] = h.crc_32[3]
|
||||
//crcbuf[2] = (h.crc_32[3] >> 8)
|
||||
//crcbuf[1] = (h.crc_32[3] >> 16)
|
||||
//crcbuf[0] = (h.crc_32[3] >> 24)
|
||||
//
|
||||
////fmt.Printf("CRC BUF: %x %v\n", crcbuf, crcbuf)
|
||||
//
|
||||
////fmt.Printf("% X\n", file_data)
|
||||
//if u16x(h.general_purpose_bit_flag) & 1 > 0 {
|
||||
// fmt.Println("Encrypted")
|
||||
// zc := zip2.NewZipCrypto(z.password)
|
||||
//
|
||||
// //result := file_data[0]
|
||||
// //for i := 0; i < 12; i++ {
|
||||
// // if i == 11 {
|
||||
// // //fmt.Printf("HASH MAGIC: %X %v\n", result ^ zc.MagicByte(), result ^ zc.MagicByte())
|
||||
// // }
|
||||
// // zc.UpdateKeys(result ^ zc.MagicByte())
|
||||
// // if i < 12 {
|
||||
// // result = file_data[i + 1]
|
||||
// // }
|
||||
// //}
|
||||
// file_header := zc.DecryptMessage(file_data[0:12])
|
||||
// //fmt.Printf("Magic Byte: %X\n", zc.MagicByte())
|
||||
// file_data = zc.DecryptMessage(file_data[12:])
|
||||
// fmt.Printf("%0 X : %0 X\n", file_header, file_data)
|
||||
// //fmt.Printf("%v %v\n", string(file_data[0:12]), string(file_data[12:]))
|
||||
// //file_data = file_data[12:]
|
||||
//}
|
||||
//if u16x(h.compression_method) == 8 {
|
||||
// //fmt.Printf("Compressed: %v\n", len(file_data))
|
||||
// rc := flate.NewReader(bytes.NewBuffer(file_data))
|
||||
// defer rc.Close()
|
||||
// res, err := ioutil.ReadAll(rc)
|
||||
// file_data = res
|
||||
// if err != nil {
|
||||
// fmt.Println(err.Error())
|
||||
// }
|
||||
//}
|
||||
//crc := crc32.NewIEEE()
|
||||
//crc.Write(file_data)
|
||||
//fmt.Printf("GO CRC: %X\n", crc.Sum32())
|
||||
//fmt.Printf("\n%v\n", string(file_data))
|
||||
//}
|
||||
}
|
||||
|
||||
func (z *ZipReader) DirectoryStructure() {
|
||||
|
||||
}
|
||||
|
||||
func u16(b []byte) uint16 {
|
||||
return binary.LittleEndian.Uint16(b)
|
||||
}
|
||||
|
||||
func u32(b []byte) uint32 {
|
||||
return binary.LittleEndian.Uint32(b)
|
||||
}
|
||||
|
||||
func u16x(b []byte) uint64 {
|
||||
return uint64(u16(b))
|
||||
}
|
||||
|
||||
func u32x(b []byte) uint64 {
|
||||
return uint64(u32(b))
|
||||
}
|
||||
|
||||
func u64x(b []byte) uint64 {
|
||||
return uint64(u32(b))
|
||||
}
|
||||
|
||||
|
||||
type Bytes struct {
|
||||
b []byte
|
||||
i uint64
|
||||
}
|
||||
|
||||
// Get slice of byte
|
||||
func (b *Bytes) Get(offset, size uint64) []byte {
|
||||
return b.b[offset : offset + size]
|
||||
}
|
||||
|
||||
func (b *Bytes) BGet(offset, size uint64) *Bytes {
|
||||
return &Bytes{b.Get(offset, size), 0}
|
||||
}
|
||||
|
||||
// Incremental Get
|
||||
func (b *Bytes) IGet(size uint64) []byte {
|
||||
i := b.i
|
||||
b.i = i + size
|
||||
return b.b[i : b.i]
|
||||
}
|
||||
|
||||
// Incremental Get
|
||||
func (b *Bytes) IBGet(size uint64) *Bytes {
|
||||
return &Bytes{b.IGet(size), 0}
|
||||
}
|
||||
|
||||
func (b *Bytes) I64() uint64 {
|
||||
switch len(b.b) {
|
||||
case 1:
|
||||
return uint64(b.b[0])
|
||||
case 2:
|
||||
return u16x(b.b)
|
||||
case 4:
|
||||
return u32x(b.b)
|
||||
case 8:
|
||||
return u64x(b.b)
|
||||
}
|
||||
return 0
|
||||
}
|
||||
// Set offset
|
||||
func (b *Bytes) Offset(i uint64) {
|
||||
b.i = i
|
||||
}
|
||||
|
||||
func (b *Bytes) Pos() uint64 {
|
||||
return b.i
|
||||
}
|
||||
55
writer.go
55
writer.go
|
|
@ -11,10 +11,10 @@ import (
|
|||
"hash"
|
||||
"hash/crc32"
|
||||
"io"
|
||||
"fmt"
|
||||
)
|
||||
|
||||
// TODO(adg): support zip file comments
|
||||
// TODO(adg): support specifying deflate level
|
||||
|
||||
// Writer implements a zip file writer.
|
||||
type Writer struct {
|
||||
|
|
@ -22,6 +22,7 @@ type Writer struct {
|
|||
dir []*header
|
||||
last *fileWriter
|
||||
closed bool
|
||||
compressors map[uint16]Compressor
|
||||
}
|
||||
|
||||
type header struct {
|
||||
|
|
@ -52,7 +53,7 @@ func (w *Writer) Flush() error {
|
|||
}
|
||||
|
||||
// Close finishes writing the zip file by writing the central directory.
|
||||
// It does not (and can not) close the underlying writer.
|
||||
// It does not (and cannot) close the underlying writer.
|
||||
func (w *Writer) Close() error {
|
||||
if w.last != nil && !w.last.closed {
|
||||
if err := w.last.close(); err != nil {
|
||||
|
|
@ -78,7 +79,8 @@ func (w *Writer) Close() error {
|
|||
b.uint16(h.ModifiedTime)
|
||||
b.uint16(h.ModifiedDate)
|
||||
b.uint32(h.CRC32)
|
||||
if h.isZip64() || h.offset > uint32max {
|
||||
|
||||
if h.isZip64() || h.offset >= uint32max {
|
||||
// the file needs a zip64 header. store maxint in both
|
||||
// 32 bit size fields (and offset later) to signal that the
|
||||
// zip64 extra header should be used.
|
||||
|
|
@ -98,6 +100,7 @@ func (w *Writer) Close() error {
|
|||
b.uint32(h.CompressedSize)
|
||||
b.uint32(h.UncompressedSize)
|
||||
}
|
||||
|
||||
b.uint16(uint16(len(h.Name)))
|
||||
b.uint16(uint16(len(h.Extra)))
|
||||
b.uint16(uint16(len(h.Comment)))
|
||||
|
|
@ -211,8 +214,7 @@ func (w *Writer) CreateHeader(fh *FileHeader) (io.Writer, error) {
|
|||
}
|
||||
|
||||
fh.Flags |= 0x8 // we will write a data descriptor
|
||||
// TODO(alex): Look at spec and see if these need to be changed
|
||||
// when using encryption.
|
||||
|
||||
fh.CreatorVersion = fh.CreatorVersion&0xff00 | zipVersion20 // preserve compatibility byte
|
||||
fh.ReaderVersion = zipVersion20
|
||||
|
||||
|
|
@ -221,18 +223,17 @@ func (w *Writer) CreateHeader(fh *FileHeader) (io.Writer, error) {
|
|||
compCount: &countWriter{w: w.cw},
|
||||
crc32: crc32.NewIEEE(),
|
||||
}
|
||||
// Get the compressor before possibly changing Method to 99 due to password
|
||||
comp := compressor(fh.Method)
|
||||
comp := w.compressor(fh.Method)
|
||||
if comp == nil {
|
||||
return nil, ErrAlgorithm
|
||||
}
|
||||
// check for password
|
||||
var sw io.Writer = fw.compCount
|
||||
if fh.password != nil {
|
||||
// we have a password and need to encrypt.
|
||||
fh.writeWinZipExtra()
|
||||
fh.Method = 99 // ok to change, we've gotten the comp and wrote extra
|
||||
ew, err := newEncryptionWriter(sw, fh.password, fw)
|
||||
if !fh.IsEncrypted() {
|
||||
fh.setEncryptionBit()
|
||||
}
|
||||
ew, err := ZipCryptoEncryptor(sw, fh.password, fw)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
|
@ -272,6 +273,7 @@ func writeHeader(w io.Writer, h *FileHeader) error {
|
|||
b.uint32(0) // since we are writing a data descriptor crc32,
|
||||
b.uint32(0) // compressed size,
|
||||
b.uint32(0) // and uncompressed size should be zero
|
||||
fmt.Printf("File HEader Wring %0 X, %v, %v\n", h.CRC32, h.CompressedSize, h.UncompressedSize)
|
||||
b.uint16(uint16(len(h.Name)))
|
||||
b.uint16(uint16(len(h.Extra)))
|
||||
if _, err := w.Write(buf[:]); err != nil {
|
||||
|
|
@ -284,6 +286,24 @@ func writeHeader(w io.Writer, h *FileHeader) error {
|
|||
return err
|
||||
}
|
||||
|
||||
// RegisterCompressor registers or overrides a custom compressor for a specific
|
||||
// method ID. If a compressor for a given method is not found, Writer will
|
||||
// default to looking up the compressor at the package level.
|
||||
func (w *Writer) RegisterCompressor(method uint16, comp Compressor) {
|
||||
if w.compressors == nil {
|
||||
w.compressors = make(map[uint16]Compressor)
|
||||
}
|
||||
w.compressors[method] = comp
|
||||
}
|
||||
|
||||
func (w *Writer) compressor(method uint16) Compressor {
|
||||
comp := w.compressors[method]
|
||||
if comp == nil {
|
||||
comp = compressor(method)
|
||||
}
|
||||
return comp
|
||||
}
|
||||
|
||||
type fileWriter struct {
|
||||
*header
|
||||
zipw io.Writer
|
||||
|
|
@ -312,21 +332,10 @@ func (w *fileWriter) close() error {
|
|||
if err := w.comp.Close(); err != nil {
|
||||
return err
|
||||
}
|
||||
// if encrypted grab the hmac and write it out
|
||||
if w.header.IsEncrypted() {
|
||||
authCode := w.hmac.Sum(nil)
|
||||
authCode = authCode[:10]
|
||||
_, err := w.compCount.Write(authCode)
|
||||
if err != nil {
|
||||
return errors.New("zip: error writing authcode")
|
||||
}
|
||||
}
|
||||
|
||||
// update FileHeader
|
||||
fh := w.header.FileHeader
|
||||
// ae-2 we don't write out CRC
|
||||
if !fh.IsEncrypted() {
|
||||
fh.CRC32 = w.crc32.Sum32()
|
||||
}
|
||||
fh.CompressedSize64 = uint64(w.compCount.count)
|
||||
fh.UncompressedSize64 = uint64(w.rawCount.count)
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,121 @@
|
|||
package zip
|
||||
|
||||
import (
|
||||
"io"
|
||||
"bytes"
|
||||
"fmt"
|
||||
"hash/crc32"
|
||||
)
|
||||
|
||||
type ZipCrypto struct {
|
||||
password []byte
|
||||
Keys [3]uint32
|
||||
}
|
||||
|
||||
func NewZipCrypto(passphrase []byte) *ZipCrypto {
|
||||
z := &ZipCrypto{}
|
||||
z.password = passphrase
|
||||
z.Init()
|
||||
return z
|
||||
}
|
||||
|
||||
func (z *ZipCrypto) Init() {
|
||||
z.Keys[0] = 0x12345678
|
||||
z.Keys[1] = 0x23456789
|
||||
z.Keys[2] = 0x34567890
|
||||
|
||||
for i := 0; i < len(z.password); i++ {
|
||||
z.UpdateKeys(z.password[i])
|
||||
}
|
||||
}
|
||||
|
||||
func (z *ZipCrypto) UpdateKeys(byteValue byte) {
|
||||
z.Keys[0] = Crc32update(z.Keys[0], byteValue);
|
||||
z.Keys[1] += z.Keys[0] & 0xff;
|
||||
z.Keys[1] = z.Keys[1] * 134775813 + 1;
|
||||
z.Keys[2] = Crc32update(z.Keys[2], (byte) (z.Keys[1] >> 24));
|
||||
}
|
||||
|
||||
func (z *ZipCrypto) MagicByte() byte {
|
||||
var t uint32 = z.Keys[2] | 2
|
||||
return byte((t * (t ^ 1)) >> 8)
|
||||
}
|
||||
|
||||
func (z *ZipCrypto) EncryptMessage(plaintext []byte) []byte {
|
||||
length := len(plaintext)
|
||||
CipherText := make([]byte, length)
|
||||
for i := 0; i < length; i++ {
|
||||
C := plaintext[i]
|
||||
CipherText[i] = plaintext[i] ^ z.MagicByte()
|
||||
z.UpdateKeys(C)
|
||||
}
|
||||
return CipherText
|
||||
}
|
||||
|
||||
func (z *ZipCrypto) DecryptMessage(chipertext []byte) []byte {
|
||||
length := len(chipertext)
|
||||
PlainText := make([]byte, length)
|
||||
for i, c := range chipertext {
|
||||
v := c ^ z.MagicByte();
|
||||
z.UpdateKeys(v)
|
||||
PlainText[i] = v
|
||||
}
|
||||
return PlainText
|
||||
}
|
||||
|
||||
func Crc32update(pCrc32 uint32, bval byte) uint32 {
|
||||
return crc32.IEEETable[(pCrc32 ^ uint32(bval)) & 0xff] ^ (pCrc32 >> 8)
|
||||
}
|
||||
|
||||
func ZipCryptoDecryptor(r *io.SectionReader, password []byte) (*io.SectionReader, error) {
|
||||
//return r, nil
|
||||
z := NewZipCrypto(password)
|
||||
b := make([]byte, r.Size())
|
||||
|
||||
r.Read(b)
|
||||
|
||||
m := z.DecryptMessage(b)
|
||||
fmt.Printf("Header: %X %X %X\n%v\n", m[0:4], m[4:8], m[8:12], m[0:12])
|
||||
fmt.Printf("Header: %X\n", m[11])
|
||||
fmt.Printf("Content: %X\n", m[12:])
|
||||
fmt.Printf("Content: %v\n", string(m[12:]))
|
||||
//if m[11] > 0xFF {
|
||||
// return nil, errors.New("incorrect password")
|
||||
//}
|
||||
//fmt.Printf("Size: %v\n", len(m))
|
||||
return io.NewSectionReader(bytes.NewReader(m), 12, int64(len(m))), nil
|
||||
}
|
||||
|
||||
type zipCryptoWriter struct {
|
||||
w io.Writer
|
||||
z *ZipCrypto
|
||||
first bool
|
||||
fw *fileWriter
|
||||
}
|
||||
|
||||
func (z *zipCryptoWriter) Write(p []byte) (n int, err error) {
|
||||
if z.first {
|
||||
z.first = false
|
||||
header := []byte{0xF8, 0x53, 0xCF, 0x05, 0x2D, 0xDD, 0xAD, 0xC8, 0x66, 0x3F, 0x8C, 0xAC}
|
||||
header = z.z.EncryptMessage(header)
|
||||
|
||||
crc := z.fw.ModifiedTime
|
||||
header[10] = byte(crc)
|
||||
header[11] = byte(crc >> 8)
|
||||
|
||||
z.z.Init()
|
||||
z.w.Write(z.z.EncryptMessage(header))
|
||||
n += 12
|
||||
//z.z.Init()
|
||||
}
|
||||
z.w.Write(z.z.EncryptMessage(p))
|
||||
z.fw.FileHeader.CompressedSize += uint32(n)
|
||||
return
|
||||
}
|
||||
|
||||
func ZipCryptoEncryptor(i io.Writer, pass passwordFn, fw *fileWriter) (io.Writer, error) {
|
||||
fmt.Printf("Initializationg...\n")
|
||||
z := NewZipCrypto(pass())
|
||||
zc := &zipCryptoWriter{i, z, true, fw}
|
||||
return zc, nil
|
||||
}
|
||||
Loading…
Reference in New Issue