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Viewing changes to doc/talks/io2010/encrypt.go

  • Committer: Package Import Robot
  • Author(s): James Page
  • Date: 2013-08-20 14:06:23 UTC
  • mfrom: (14.1.23 saucy-proposed)
  • Revision ID: package-import@ubuntu.com-20130820140623-b414jfxi3m0qkmrq
Tags: 2:1.1.2-2ubuntu1
https://launchpad.net/bugs/1211749
https://launchpad.net/bugs/1202027
* Merge from Debian unstable (LP: #1211749, #1202027). Remaining changes:
  - 016-armhf-elf-header.patch: Use correct ELF header for armhf binaries.
  - d/control,control.cross: Update Breaks/Replaces for Ubuntu
    versions to ensure smooth upgrades, regenerate control file.

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doc/talks/io2010/encrypt.go
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// 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.WriteCloser
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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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        w, 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 w.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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        _, err = io.Copy(cipher.StreamWriter{S: cipher.NewOFB(c, iv), W: w}, r)
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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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}