mirror of
https://github.com/golang/go
synced 2024-11-18 23:24:39 -07:00
86 lines
1.5 KiB
Go
86 lines
1.5 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This code differs from the slides in that it handles errors.
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package main
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import (
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"crypto/aes"
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"crypto/cipher"
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"compress/gzip"
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"io"
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"log"
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"os"
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)
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func EncryptAndGzip(dstfile, srcfile string, key, iv []byte) error {
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r, err := os.Open(srcfile)
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if err != nil {
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return err
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}
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var w io.Writer
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w, err = os.Create(dstfile)
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if err != nil {
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return err
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}
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c, err := aes.NewCipher(key)
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if err != nil {
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return err
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}
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w = cipher.StreamWriter{S: cipher.NewOFB(c, iv), W: w}
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w2, err := gzip.NewWriter(w)
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if err != nil {
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return err
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}
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defer w2.Close()
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_, err = io.Copy(w2, r)
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return err
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}
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func DecryptAndGunzip(dstfile, srcfile string, key, iv []byte) error {
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f, err := os.Open(srcfile)
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if err != nil {
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return err
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}
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defer f.Close()
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c, err := aes.NewCipher(key)
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if err != nil {
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return err
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}
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r := cipher.StreamReader{S: cipher.NewOFB(c, iv), R: f}
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r2, err := gzip.NewReader(r)
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if err != nil {
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return err
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}
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w, err := os.Create(dstfile)
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if err != nil {
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return err
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}
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defer w.Close()
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_, err = io.Copy(w, r2)
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return err
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}
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func main() {
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err := EncryptAndGzip(
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"/tmp/passwd.gz",
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"/etc/passwd",
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make([]byte, 16),
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make([]byte, 16),
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)
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if err != nil {
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log.Fatal(err)
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}
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err = DecryptAndGunzip(
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"/dev/stdout",
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"/tmp/passwd.gz",
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make([]byte, 16),
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make([]byte, 16),
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)
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if err != nil {
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log.Fatal(err)
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}
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}
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