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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code differs from the slides in that it handles errors.
package main
import (
"crypto/aes"
"crypto/cipher"
"compress/gzip"
"io"
"log"
"os"
)
func EncryptAndGzip(dstfile, srcfile string, key, iv []byte) error {
r, err := os.Open(srcfile)
if err != nil {
return err
}
var w io.Writer
w, err = os.Create(dstfile)
if err != nil {
return err
}
c, err := aes.NewCipher(key)
if err != nil {
return err
}
w = cipher.StreamWriter{S: cipher.NewOFB(c, iv), W: w}
w2, err := gzip.NewWriter(w)
if err != nil {
return err
}
defer w2.Close()
_, err = io.Copy(w2, r)
return err
}
func DecryptAndGunzip(dstfile, srcfile string, key, iv []byte) error {
f, err := os.Open(srcfile)
if err != nil {
return err
}
defer f.Close()
c, err := aes.NewCipher(key)
if err != nil {
return err
}
r := cipher.StreamReader{S: cipher.NewOFB(c, iv), R: f}
r2, err := gzip.NewReader(r)
if err != nil {
return err
}
w, err := os.Create(dstfile)
if err != nil {
return err
}
defer w.Close()
_, err = io.Copy(w, r2)
return err
}
func main() {
err := EncryptAndGzip(
"/tmp/passwd.gz",
"/etc/passwd",
make([]byte, 16),
make([]byte, 16),
)
if err != nil {
log.Fatal(err)
}
err = DecryptAndGunzip(
"/dev/stdout",
"/tmp/passwd.gz",
make([]byte, 16),
make([]byte, 16),
)
if err != nil {
log.Fatal(err)
}
}
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