aboutsummaryrefslogtreecommitdiff
path: root/main.go
blob: 741975236da349ba5c27c91701bc64c94e7867b5 (plain)
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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
package main

import (
	"errors"
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"path"
)

const (
	verFailed = "signature verfication failed"
	verOK     = "Signature Verfied"
)

/*
	signify -C [-q] -p pubkey -x sigfile [file ...]
	signify -G [-n] [-c comment] -p pubkey -s seckey
	signify -S [-ez] [-x sigfile] -s seckey -m message
	signify -V [-eqz] [-p pubkey] [-t keytype] [-x sigfile] -m message
*/

var (
	checksum = flag.Bool("C", false, "Verify a signed checksum list")
	generate = flag.Bool("G", false, "Generate a new key pair")
	sign     = flag.Bool("S", false, "Sign the specfied message")
	verify   = flag.Bool("V", false, "Verify the message")
	comment  = flag.String("c", "signify", "Comment")
	embed    = flag.Bool("e", false, "Embed the message")
	msg      = flag.String("m", "", "Message file")
	nopass   = flag.Bool("n", false, "No key passphrase")
	pub      = flag.String("p", "", "Public key file")
	quiet    = flag.Bool("q", false, "Quiet mode")
	sec      = flag.String("s", "", "Secret key file")
	sig      = flag.String("x", "", "Signature file")
	gzip     = flag.Bool("z", false, "Sign and verify gzip archives")
)

func main() {
	flag.Parse()

	switch {
	case *generate:
		rounds := DefaultRounds
		if *nopass {
			rounds = 0
		}
		if err := Generate(*pub, *sec, *comment, rounds); err != nil {
			log.Fatal(err)
		}
	case *sign:
		if err := Sign(*msg, *sec, *embed); err != nil {
			log.Fatal(err)
		}
	case *verify:
		if err := Verify(*msg, *pub); err != nil {
			log.Fatal(err)
		}
	default:
		flag.Usage()
	}
}

func Generate(pubFile, secFile, comment string, rounds int) error {
	pubKey, encKey, err := NewKey()
	if err != nil {
		return err
	}

	if rounds > 0 {
		pass, err := AskPassword(nil, true)
		if err != nil {
			return err
		}
		encKey.Kdf(pass, rounds)
	}

	encRaw, err := Marshal(encKey)
	if err != nil {
		return err
	}

	sfile := File{
		Comment: fmt.Sprintf("%s secret key", comment),
		RawKey:  encRaw,
	}
	if err := sfile.WriteFile(secFile, SecMode); err != nil {
		return err
	}

	pubRaw, err := Marshal(pubKey)
	if err != nil {
		return err
	}
	pfile := File{
		Comment: fmt.Sprintf("%s public key", comment),
		RawKey:  pubRaw,
	}
	if err := pfile.WriteFile(pubFile, PubMode); err != nil {
		return err
	}

	return nil
}

func Sign(msgFile, secFile string, embed bool) error {
	sfile, err := ParseFile(secFile)
	if err != nil {
		return err
	}
	encKey := new(EncKey)
	if err := Unmarshal(sfile.RawKey, encKey); err != nil {
		return err
	}
	if encKey.KDFRounds > 0 {
		pass, err := AskPassword(nil, false)
		if err != nil {
			return err
		}
		encKey.Kdf(pass, int(encKey.KDFRounds))
	}
	if !encKey.IsValid() {
		return errors.New("invalid key")
	}
	body, err := ioutil.ReadFile(msgFile)
	if err != nil {
		return err
	}
	sig := encKey.Sign(body)
	sigRaw, err := Marshal(sig)
	if err != nil {
		return err
	}
	sigfile := File{
		Comment: fmt.Sprintf("verify with %s", path.Base(secFile)), // TODO replace .sec with .pub
		RawKey:  sigRaw,
	}
	if embed {
		sigfile.Message = body
	}
	if err := sigfile.WriteFile(msgFile+".sig", PubMode); err != nil {
		return err
	}
	return nil
}

func Verify(msgFile, pubFile string) error {
	return nil
}