File: main.go

package info (click to toggle)
golang-gopkg-square-go-jose.v2 2.5.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, experimental, sid
  • size: 1,004 kB
  • sloc: makefile: 4
file content (189 lines) | stat: -rw-r--r-- 5,411 bytes parent folder | download | duplicates (2)
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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/*-
 * Copyright 2014 Square Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package main

import (
	"fmt"
	"io/ioutil"
	"os"

	"gopkg.in/alecthomas/kingpin.v2"
	"gopkg.in/square/go-jose.v2"
)

var (
	app = kingpin.New("jose-util", "A command-line utility for dealing with JOSE objects.")

	keyFile = app.Flag("key", "Path to key file (PEM or DER-encoded)").ExistingFile()
	inFile  = app.Flag("in", "Path to input file (stdin if missing)").ExistingFile()
	outFile = app.Flag("out", "Path to output file (stdout if missing)").ExistingFile()

	encryptCommand = app.Command("encrypt", "Encrypt a plaintext, output ciphertext.")
	algFlag        = encryptCommand.Flag("alg", "Key management algorithm (e.g. RSA-OAEP)").Required().String()
	encFlag        = encryptCommand.Flag("enc", "Content encryption algorithm (e.g. A128GCM)").Required().String()

	decryptCommand = app.Command("decrypt", "Decrypt a ciphertext, output plaintext.")

	signCommand = app.Command("sign", "Sign a payload, output signed message.")
	sigAlgFlag  = signCommand.Flag("alg", "Key management algorithm (e.g. RSA-OAEP)").Required().String()

	verifyCommand = app.Command("verify", "Verify a signed message, output payload.")

	expandCommand = app.Command("expand", "Expand JOSE object to full serialization format.")
	formatFlag    = expandCommand.Flag("format", "Type of message to expand (JWS or JWE, defaults to JWE)").String()

	full = app.Flag("full", "Use full serialization format (instead of compact)").Bool()
)

func main() {
	app.Version("v2")

	command := kingpin.MustParse(app.Parse(os.Args[1:]))

	var keyBytes []byte
	var err error
	if command != "expand" {
		keyBytes, err = ioutil.ReadFile(*keyFile)
		exitOnError(err, "unable to read key file")
	}

	switch command {
	case "encrypt":
		pub, err := LoadPublicKey(keyBytes)
		exitOnError(err, "unable to read public key")

		alg := jose.KeyAlgorithm(*algFlag)
		enc := jose.ContentEncryption(*encFlag)

		crypter, err := jose.NewEncrypter(enc, jose.Recipient{Algorithm: alg, Key: pub}, nil)
		exitOnError(err, "unable to instantiate encrypter")

		obj, err := crypter.Encrypt(readInput(*inFile))
		exitOnError(err, "unable to encrypt")

		var msg string
		if *full {
			msg = obj.FullSerialize()
		} else {
			msg, err = obj.CompactSerialize()
			exitOnError(err, "unable to serialize message")
		}

		writeOutput(*outFile, []byte(msg))
	case "decrypt":
		priv, err := LoadPrivateKey(keyBytes)
		exitOnError(err, "unable to read private key")

		obj, err := jose.ParseEncrypted(string(readInput(*inFile)))
		exitOnError(err, "unable to parse message")

		plaintext, err := obj.Decrypt(priv)
		exitOnError(err, "unable to decrypt message")

		writeOutput(*outFile, plaintext)
	case "sign":
		signingKey, err := LoadPrivateKey(keyBytes)
		exitOnError(err, "unable to read private key")

		alg := jose.SignatureAlgorithm(*sigAlgFlag)
		signer, err := jose.NewSigner(jose.SigningKey{Algorithm: alg, Key: signingKey}, nil)
		exitOnError(err, "unable to make signer")

		obj, err := signer.Sign(readInput(*inFile))
		exitOnError(err, "unable to sign")

		var msg string
		if *full {
			msg = obj.FullSerialize()
		} else {
			msg, err = obj.CompactSerialize()
			exitOnError(err, "unable to serialize message")
		}

		writeOutput(*outFile, []byte(msg))
	case "verify":
		verificationKey, err := LoadPublicKey(keyBytes)
		exitOnError(err, "unable to read public key")

		obj, err := jose.ParseSigned(string(readInput(*inFile)))
		exitOnError(err, "unable to parse message")

		plaintext, err := obj.Verify(verificationKey)
		exitOnError(err, "invalid signature")

		writeOutput(*outFile, plaintext)
	case "expand":
		input := string(readInput(*inFile))

		var serialized string
		var err error
		switch *formatFlag {
		case "", "JWE":
			var jwe *jose.JSONWebEncryption
			jwe, err = jose.ParseEncrypted(input)
			if err == nil {
				serialized = jwe.FullSerialize()
			}
		case "JWS":
			var jws *jose.JSONWebSignature
			jws, err = jose.ParseSigned(input)
			if err == nil {
				serialized = jws.FullSerialize()
			}
		}

		exitOnError(err, "unable to expand message")
		writeOutput(*outFile, []byte(serialized))
		writeOutput(*outFile, []byte("\n"))
	}
}

// Exit and print error message if we encountered a problem
func exitOnError(err error, msg string) {
	if err != nil {
		fmt.Fprintf(os.Stderr, "%s: %s\n", msg, err)
		os.Exit(1)
	}
}

// Read input from file or stdin
func readInput(path string) []byte {
	var bytes []byte
	var err error

	if path != "" {
		bytes, err = ioutil.ReadFile(path)
	} else {
		bytes, err = ioutil.ReadAll(os.Stdin)
	}

	exitOnError(err, "unable to read input")
	return bytes
}

// Write output to file or stdin
func writeOutput(path string, data []byte) {
	var err error

	if path != "" {
		err = ioutil.WriteFile(path, data, 0644)
	} else {
		_, err = os.Stdout.Write(data)
	}

	exitOnError(err, "unable to write output")
}