1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// Copyright 2012 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.
// Crypt is a simple password-based encryption program,
// demonstrating how to use github.com/mattermost/rsc/crypt.
//
// Encrypt input to output using password:
// crypt password <input >output
//
// Decrypt input to output using password:
// crypt -d password <input >output
//
// Yes, the password is a command-line argument. This is a demo of the
// github.com/mattermost/rsc/crypt package. It's not intended for real use.
//
package main
import (
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/mattermost/rsc/crypt"
)
func main() {
args := os.Args[1:]
encrypt := true
if len(args) >= 1 && args[0] == "-d" {
encrypt = false
args = args[1:]
}
if len(args) != 1 || strings.HasPrefix(args[0], "-") {
fmt.Fprintf(os.Stderr, "usage: crypt [-d] password < input > output\n")
os.Exit(2)
}
password := args[0]
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
fmt.Fprintf(os.Stderr, "reading stdin: %v\n", err)
os.Exit(1)
}
if encrypt {
pkt, err := crypt.Encrypt(password, data)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
str := base64.StdEncoding.EncodeToString(pkt)
for len(str) > 60 {
fmt.Printf("%s\n", str[:60])
str = str[60:]
}
fmt.Printf("%s\n", str)
} else {
pkt, err := base64.StdEncoding.DecodeString(strings.Map(noSpace, string(data)))
if err != nil {
fmt.Fprintf(os.Stderr, "decoding input: %v\n", err)
os.Exit(1)
}
dec, err := crypt.Decrypt(password, pkt)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
os.Stdout.Write(dec)
}
}
func noSpace(r rune) rune {
if r == ' ' || r == '\t' || r == '\n' {
return -1
}
return r
}
|
