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
|
// Copyright 2023 Google LLC
//
// 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 aead_test
import (
"bytes"
"testing"
"google.golang.org/protobuf/proto"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/core/registry"
"github.com/tink-crypto/tink-go/v2/insecurecleartextkeyset"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/mac"
"github.com/tink-crypto/tink-go/v2/testing/fakekms"
"github.com/tink-crypto/tink-go/v2/testutil"
ctrpb "github.com/tink-crypto/tink-go/v2/proto/aes_ctr_go_proto"
ctrhmacpb "github.com/tink-crypto/tink-go/v2/proto/aes_ctr_hmac_aead_go_proto"
hmacpb "github.com/tink-crypto/tink-go/v2/proto/hmac_go_proto"
kmsenvpb "github.com/tink-crypto/tink-go/v2/proto/kms_envelope_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
func TestNewKMSEnvelopeAEADKeyWithInvalidDEK(t *testing.T) {
keyURI, err := fakekms.NewKeyURI()
if err != nil {
t.Fatalf("fakekms.NewKeyURI() err = %v", err)
}
// Create a KmsEnvelopeAeadKeyFormat with a DekTemplate that is not supported.
format := &kmsenvpb.KmsEnvelopeAeadKeyFormat{
KekUri: keyURI,
DekTemplate: mac.HMACSHA256Tag128KeyTemplate(),
}
serializedFormat, err := proto.Marshal(format)
if err != nil {
t.Fatalf("failed to marshal key format: %s", err)
}
keyTemplate := &tinkpb.KeyTemplate{
Value: serializedFormat,
TypeUrl: testutil.KMSEnvelopeAEADTypeURL,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
}
_, err = keyset.NewHandle(keyTemplate)
if err == nil {
t.Errorf("keyset.NewHandle(keyTemplate) err = nil, want error")
}
}
func TestNewKMSEnvelopeAEADKeyWithInvalidSerializedKeyFormat(t *testing.T) {
keyURI, err := fakekms.NewKeyURI()
if err != nil {
t.Fatalf("fakekms.NewKeyURI() err = %v", err)
}
fakeClient, err := fakekms.NewClient(keyURI)
if err != nil {
t.Fatalf("fakekms.NewClient() err = %v", err)
}
registry.RegisterKMSClient(fakeClient)
defer registry.ClearKMSClients()
// Create DEK template with unset embedded key parameters.
dekFormat := &ctrhmacpb.AesCtrHmacAeadKeyFormat{
AesCtrKeyFormat: &ctrpb.AesCtrKeyFormat{
Params: nil,
KeySize: 32,
},
HmacKeyFormat: &hmacpb.HmacKeyFormat{
Params: nil,
KeySize: 32,
},
}
serializedDEKFormat, err := proto.Marshal(dekFormat)
if err != nil {
t.Fatalf("failed to marshal key format: %s", err)
}
dekTemplate := &tinkpb.KeyTemplate{
Value: serializedDEKFormat,
TypeUrl: testutil.AESCTRHMACAEADTypeURL,
OutputPrefixType: tinkpb.OutputPrefixType_TINK,
}
format := &kmsenvpb.KmsEnvelopeAeadKeyFormat{
KekUri: keyURI,
DekTemplate: dekTemplate,
}
serializedFormat, err := proto.Marshal(format)
if err != nil {
t.Fatalf("failed to marshal key format: %s", err)
}
keyTemplate := &tinkpb.KeyTemplate{
Value: serializedFormat,
TypeUrl: testutil.KMSEnvelopeAEADTypeURL,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
}
// Currently, the DEK template isn't checked for validatiy during creation
// of a KMSEnvelopeAEAD key. It's only exercised when a cryptographic
// operation is attempted.
//
// TODO(ckl): Rework if DEK template is exercised during initialization.
handle, err := keyset.NewHandle(keyTemplate)
if err != nil {
t.Fatalf("keyset.NewHandle(keyTemplate) err = %v, want nil", err)
}
a, err := aead.New(handle)
if err != nil {
t.Fatalf("handle.NewAEAD(keyURI) err = %v, want nil", err)
}
_, err = a.Encrypt([]byte{}, []byte{})
if err == nil {
t.Errorf("a.Encrypt() err = nil, want error")
}
}
func TestKMSEnvelopeAEADWithTinkPrefix(t *testing.T) {
keyURI := "fake-kms://CM2b3_MDElQKSAowdHlwZS5nb29nbGVhcGlzLmNvbS9nb29nbGUuY3J5cHRvLnRpbmsuQWVzR2NtS2V5EhIaEIK75t5L-adlUwVhWvRuWUwYARABGM2b3_MDIAE"
client, err := fakekms.NewClient(keyURI)
if err != nil {
t.Fatal(err)
}
registry.RegisterKMSClient(client)
defer registry.ClearKMSClients()
// Keyset that was created with
// aead.CreateKMSEnvelopeAEADKeyTemplate(keyURI, aead.AES256GCMKeyTemplate()), and then serialized
// with Tink's JSON keyset witer. Then, the output prefix type was changed from "RAW" to "TINK".
jsonKeysetWithTinkPrefix := `{"primaryKeyId":3980895889, "key":[{"keyData":{"typeUrl":"type.googleapis.com/google.crypto.tink.KmsEnvelopeAeadKey", "value":"EsMBCoYBZmFrZS1rbXM6Ly9DTTJiM19NREVsUUtTQW93ZEhsd1pTNW5iMjluYkdWaGNHbHpMbU52YlM5bmIyOW5iR1V1WTNKNWNIUnZMblJwYm1zdVFXVnpSMk50UzJWNUVoSWFFSUs3NXQ1TC1hZGxVd1ZoV3ZSdVdVd1lBUkFCR00yYjNfTURJQUUSOAowdHlwZS5nb29nbGVhcGlzLmNvbS9nb29nbGUuY3J5cHRvLnRpbmsuQWVzR2NtS2V5EgIQIBgB", "keyMaterialType":"REMOTE"}, "status":"ENABLED", "keyId":3980895889, "outputPrefixType":"TINK"}]}`
parsedHandle, err := insecurecleartextkeyset.Read(
keyset.NewJSONReader(bytes.NewBuffer([]byte(jsonKeysetWithTinkPrefix))))
if err != nil {
t.Fatalf("insecurecleartextkeyset.Read() err = %v, want nil", err)
}
primitive, err := aead.New(parsedHandle)
if err != nil {
t.Fatal(err)
}
plaintext := []byte("message")
associatedData := []byte("example KMS envelope AEAD encryption")
ciphertext, err := primitive.Encrypt(plaintext, associatedData)
if err != nil {
t.Fatal(err)
}
gotPlaintext, err := primitive.Decrypt(ciphertext, associatedData)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(gotPlaintext, plaintext) {
t.Fatalf("got plaintext %q, want %q", gotPlaintext, plaintext)
}
// Also verify that the ciphertext has a TINK prefix
gotPrefix := ciphertext[:5]
// The Tink prefix is 0x01 followed by the 4 bytes key ID. The key ID is 3980895889, which is
// equal to 0xed47a691.
wantPrefix := []byte{0x01, 0xed, 0x47, 0xa6, 0x91}
if !bytes.Equal(gotPrefix, wantPrefix) {
t.Fatalf("ciphertext[:5] = %q, want %q", gotPrefix, wantPrefix)
}
}
|
