summaryrefslogtreecommitdiff
path: root/libgo/go/crypto/rsa/pss_test.go
blob: 32e6fc39d291890bb17357f20d68af83f69aa474 (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
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
// Copyright 2013 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.

package rsa

import (
	"bufio"
	"bytes"
	"compress/bzip2"
	"crypto"
	_ "crypto/md5"
	"crypto/rand"
	"crypto/sha1"
	_ "crypto/sha256"
	"encoding/hex"
	"math/big"
	"os"
	"strconv"
	"strings"
	"testing"
)

func TestEMSAPSS(t *testing.T) {
	// Test vector in file pss-int.txt from: ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip
	msg := []byte{
		0x85, 0x9e, 0xef, 0x2f, 0xd7, 0x8a, 0xca, 0x00, 0x30, 0x8b,
		0xdc, 0x47, 0x11, 0x93, 0xbf, 0x55, 0xbf, 0x9d, 0x78, 0xdb,
		0x8f, 0x8a, 0x67, 0x2b, 0x48, 0x46, 0x34, 0xf3, 0xc9, 0xc2,
		0x6e, 0x64, 0x78, 0xae, 0x10, 0x26, 0x0f, 0xe0, 0xdd, 0x8c,
		0x08, 0x2e, 0x53, 0xa5, 0x29, 0x3a, 0xf2, 0x17, 0x3c, 0xd5,
		0x0c, 0x6d, 0x5d, 0x35, 0x4f, 0xeb, 0xf7, 0x8b, 0x26, 0x02,
		0x1c, 0x25, 0xc0, 0x27, 0x12, 0xe7, 0x8c, 0xd4, 0x69, 0x4c,
		0x9f, 0x46, 0x97, 0x77, 0xe4, 0x51, 0xe7, 0xf8, 0xe9, 0xe0,
		0x4c, 0xd3, 0x73, 0x9c, 0x6b, 0xbf, 0xed, 0xae, 0x48, 0x7f,
		0xb5, 0x56, 0x44, 0xe9, 0xca, 0x74, 0xff, 0x77, 0xa5, 0x3c,
		0xb7, 0x29, 0x80, 0x2f, 0x6e, 0xd4, 0xa5, 0xff, 0xa8, 0xba,
		0x15, 0x98, 0x90, 0xfc,
	}
	salt := []byte{
		0xe3, 0xb5, 0xd5, 0xd0, 0x02, 0xc1, 0xbc, 0xe5, 0x0c, 0x2b,
		0x65, 0xef, 0x88, 0xa1, 0x88, 0xd8, 0x3b, 0xce, 0x7e, 0x61,
	}
	expected := []byte{
		0x66, 0xe4, 0x67, 0x2e, 0x83, 0x6a, 0xd1, 0x21, 0xba, 0x24,
		0x4b, 0xed, 0x65, 0x76, 0xb8, 0x67, 0xd9, 0xa4, 0x47, 0xc2,
		0x8a, 0x6e, 0x66, 0xa5, 0xb8, 0x7d, 0xee, 0x7f, 0xbc, 0x7e,
		0x65, 0xaf, 0x50, 0x57, 0xf8, 0x6f, 0xae, 0x89, 0x84, 0xd9,
		0xba, 0x7f, 0x96, 0x9a, 0xd6, 0xfe, 0x02, 0xa4, 0xd7, 0x5f,
		0x74, 0x45, 0xfe, 0xfd, 0xd8, 0x5b, 0x6d, 0x3a, 0x47, 0x7c,
		0x28, 0xd2, 0x4b, 0xa1, 0xe3, 0x75, 0x6f, 0x79, 0x2d, 0xd1,
		0xdc, 0xe8, 0xca, 0x94, 0x44, 0x0e, 0xcb, 0x52, 0x79, 0xec,
		0xd3, 0x18, 0x3a, 0x31, 0x1f, 0xc8, 0x96, 0xda, 0x1c, 0xb3,
		0x93, 0x11, 0xaf, 0x37, 0xea, 0x4a, 0x75, 0xe2, 0x4b, 0xdb,
		0xfd, 0x5c, 0x1d, 0xa0, 0xde, 0x7c, 0xec, 0xdf, 0x1a, 0x89,
		0x6f, 0x9d, 0x8b, 0xc8, 0x16, 0xd9, 0x7c, 0xd7, 0xa2, 0xc4,
		0x3b, 0xad, 0x54, 0x6f, 0xbe, 0x8c, 0xfe, 0xbc,
	}

	hash := sha1.New()
	hash.Write(msg)
	hashed := hash.Sum(nil)

	encoded, err := emsaPSSEncode(hashed, 1023, salt, sha1.New())
	if err != nil {
		t.Errorf("Error from emsaPSSEncode: %s\n", err)
	}
	if !bytes.Equal(encoded, expected) {
		t.Errorf("Bad encoding. got %x, want %x", encoded, expected)
	}

	if err = emsaPSSVerify(hashed, encoded, 1023, len(salt), sha1.New()); err != nil {
		t.Errorf("Bad verification: %s", err)
	}
}

// TestPSSGolden tests all the test vectors in pss-vect.txt from
// ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip
func TestPSSGolden(t *testing.T) {
	inFile, err := os.Open("testdata/pss-vect.txt.bz2")
	if err != nil {
		t.Fatalf("Failed to open input file: %s", err)
	}
	defer inFile.Close()

	// The pss-vect.txt file contains RSA keys and then a series of
	// signatures. A goroutine is used to preprocess the input by merging
	// lines, removing spaces in hex values and identifying the start of
	// new keys and signature blocks.
	const newKeyMarker = "START NEW KEY"
	const newSignatureMarker = "START NEW SIGNATURE"

	values := make(chan string)

	go func() {
		defer close(values)
		scanner := bufio.NewScanner(bzip2.NewReader(inFile))
		var partialValue string
		lastWasValue := true

		for scanner.Scan() {
			line := scanner.Text()
			switch {
			case len(line) == 0:
				if len(partialValue) > 0 {
					values <- strings.Replace(partialValue, " ", "", -1)
					partialValue = ""
					lastWasValue = true
				}
				continue
			case strings.HasPrefix(line, "# ======") && lastWasValue:
				values <- newKeyMarker
				lastWasValue = false
			case strings.HasPrefix(line, "# ------") && lastWasValue:
				values <- newSignatureMarker
				lastWasValue = false
			case strings.HasPrefix(line, "#"):
				continue
			default:
				partialValue += line
			}
		}
		if err := scanner.Err(); err != nil {
			panic(err)
		}
	}()

	var key *PublicKey
	var hashed []byte
	hash := crypto.SHA1
	h := hash.New()
	opts := &PSSOptions{
		SaltLength: PSSSaltLengthEqualsHash,
	}

	for marker := range values {
		switch marker {
		case newKeyMarker:
			key = new(PublicKey)
			nHex, ok := <-values
			if !ok {
				continue
			}
			key.N = bigFromHex(nHex)
			key.E = intFromHex(<-values)
			// We don't care for d, p, q, dP, dQ or qInv.
			for i := 0; i < 6; i++ {
				<-values
			}
		case newSignatureMarker:
			msg := fromHex(<-values)
			<-values // skip salt
			sig := fromHex(<-values)

			h.Reset()
			h.Write(msg)
			hashed = h.Sum(hashed[:0])

			if err := VerifyPSS(key, hash, hashed, sig, opts); err != nil {
				t.Error(err)
			}
		default:
			t.Fatalf("unknown marker: " + marker)
		}
	}
}

// TestPSSOpenSSL ensures that we can verify a PSS signature from OpenSSL with
// the default options. OpenSSL sets the salt length to be maximal.
func TestPSSOpenSSL(t *testing.T) {
	hash := crypto.SHA256
	h := hash.New()
	h.Write([]byte("testing"))
	hashed := h.Sum(nil)

	// Generated with `echo -n testing | openssl dgst -sign key.pem -sigopt rsa_padding_mode:pss -sha256 > sig`
	sig := []byte{
		0x95, 0x59, 0x6f, 0xd3, 0x10, 0xa2, 0xe7, 0xa2, 0x92, 0x9d,
		0x4a, 0x07, 0x2e, 0x2b, 0x27, 0xcc, 0x06, 0xc2, 0x87, 0x2c,
		0x52, 0xf0, 0x4a, 0xcc, 0x05, 0x94, 0xf2, 0xc3, 0x2e, 0x20,
		0xd7, 0x3e, 0x66, 0x62, 0xb5, 0x95, 0x2b, 0xa3, 0x93, 0x9a,
		0x66, 0x64, 0x25, 0xe0, 0x74, 0x66, 0x8c, 0x3e, 0x92, 0xeb,
		0xc6, 0xe6, 0xc0, 0x44, 0xf3, 0xb4, 0xb4, 0x2e, 0x8c, 0x66,
		0x0a, 0x37, 0x9c, 0x69,
	}

	if err := VerifyPSS(&rsaPrivateKey.PublicKey, hash, hashed, sig, nil); err != nil {
		t.Error(err)
	}
}

func TestPSSSigning(t *testing.T) {
	var saltLengthCombinations = []struct {
		signSaltLength, verifySaltLength int
		good                             bool
	}{
		{PSSSaltLengthAuto, PSSSaltLengthAuto, true},
		{PSSSaltLengthEqualsHash, PSSSaltLengthAuto, true},
		{PSSSaltLengthEqualsHash, PSSSaltLengthEqualsHash, true},
		{PSSSaltLengthEqualsHash, 8, false},
		{PSSSaltLengthAuto, PSSSaltLengthEqualsHash, false},
		{8, 8, true},
	}

	hash := crypto.MD5
	h := hash.New()
	h.Write([]byte("testing"))
	hashed := h.Sum(nil)
	var opts PSSOptions

	for i, test := range saltLengthCombinations {
		opts.SaltLength = test.signSaltLength
		sig, err := SignPSS(rand.Reader, rsaPrivateKey, hash, hashed, &opts)
		if err != nil {
			t.Errorf("#%d: error while signing: %s", i, err)
			continue
		}

		opts.SaltLength = test.verifySaltLength
		err = VerifyPSS(&rsaPrivateKey.PublicKey, hash, hashed, sig, &opts)
		if (err == nil) != test.good {
			t.Errorf("#%d: bad result, wanted: %t, got: %s", i, test.good, err)
		}
	}
}

func bigFromHex(hex string) *big.Int {
	n, ok := new(big.Int).SetString(hex, 16)
	if !ok {
		panic("bad hex: " + hex)
	}
	return n
}

func intFromHex(hex string) int {
	i, err := strconv.ParseInt(hex, 16, 32)
	if err != nil {
		panic(err)
	}
	return int(i)
}

func fromHex(hexStr string) []byte {
	s, err := hex.DecodeString(hexStr)
	if err != nil {
		panic(err)
	}
	return s
}