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// Copyright 2025 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 aescmac_test
import (
"slices"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/tink-crypto/tink-go/v2/core/cryptofmt"
"github.com/tink-crypto/tink-go/v2/insecuresecretdataaccess"
"github.com/tink-crypto/tink-go/v2/mac/aescmac"
"github.com/tink-crypto/tink-go/v2/secretdata"
)
var (
aes128Key = secretdata.NewBytesFromData([]byte("0123456789012345"), insecuresecretdataaccess.Token{})
aes256Key = secretdata.NewBytesFromData([]byte("01234567890123456789012345678901"), insecuresecretdataaccess.Token{})
)
func TestNewKeyFailsIfKeySizeIsInvalid(t *testing.T) {
params, err := aescmac.NewParameters(aescmac.ParametersOpts{
KeySizeInBytes: 16,
TagSizeInBytes: 16,
Variant: aescmac.VariantTink,
})
if err != nil {
t.Fatalf("NewParameters(16, 16, VariantTink) err = %v, want nil", err)
}
_, err = aescmac.NewKey(secretdata.NewBytesFromData([]byte("01234567890123456789012345678901"), insecuresecretdataaccess.Token{}), params, 0x01020304)
if err == nil {
t.Errorf("NewKey(secretdata.NewBytesFromData([]byte(\"01234567890123456789012345678901\"), insecuresecretdataaccess.Token{}), params, 0x01020304) err = nil, want error")
}
}
func TestNewKeyFailsWithInvalidIDRequirement(t *testing.T) {
params, err := aescmac.NewParameters(aescmac.ParametersOpts{
KeySizeInBytes: 16,
TagSizeInBytes: 16,
Variant: aescmac.VariantNoPrefix,
})
if err != nil {
t.Fatalf("NewParameters(16, 16, VariantTink) err = %v, want nil", err)
}
if _, err = aescmac.NewKey(secretdata.NewBytesFromData([]byte("0123456789012345"), insecuresecretdataaccess.Token{}), params, 0x01020304); err == nil {
t.Errorf("NewKey(secretdata.NewBytesFromData([]byte(\"0123456789012345\"), insecuresecretdataaccess.Token{}), params, 0x01020304) err = nil, want error")
}
}
func TestNewKey(t *testing.T) {
for _, tc := range []struct {
name string
key secretdata.Bytes
params *aescmac.Parameters
idRequirement uint32
wantOutputPrefix []byte
}{
{
name: "AES128 Tink",
key: aes128Key,
params: mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantTink}),
idRequirement: 0x01020304,
wantOutputPrefix: slices.Concat([]byte{cryptofmt.TinkStartByte}, []byte{0x01, 0x02, 0x03, 0x04}),
},
{
name: "AES256 Tink",
key: aes256Key,
params: mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 32, TagSizeInBytes: 16, Variant: aescmac.VariantTink}),
idRequirement: 0x01020304,
wantOutputPrefix: slices.Concat([]byte{cryptofmt.TinkStartByte}, []byte{0x01, 0x02, 0x03, 0x04}),
},
{
name: "AES128 Crunchy",
key: aes128Key,
params: mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantCrunchy}),
idRequirement: 0x01020304,
wantOutputPrefix: slices.Concat([]byte{cryptofmt.LegacyStartByte}, []byte{0x01, 0x02, 0x03, 0x04}),
},
{
name: "AES256 Crunchy",
key: aes256Key,
params: mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 32, TagSizeInBytes: 16, Variant: aescmac.VariantCrunchy}),
idRequirement: 0x01020304,
wantOutputPrefix: slices.Concat([]byte{cryptofmt.LegacyStartByte}, []byte{0x01, 0x02, 0x03, 0x04}),
},
{
name: "AES128 Raw",
key: aes128Key,
params: mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantNoPrefix}),
idRequirement: 0,
wantOutputPrefix: nil,
},
{
name: "AES256 Raw",
key: aes256Key,
params: mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 32, TagSizeInBytes: 16, Variant: aescmac.VariantNoPrefix}),
idRequirement: 0,
wantOutputPrefix: nil,
},
} {
t.Run(tc.name, func(t *testing.T) {
key, err := aescmac.NewKey(tc.key, tc.params, tc.idRequirement)
if err != nil {
t.Errorf("NewKey(%v, %v, %d) err = %v, want nil", tc.key, tc.params, tc.idRequirement, err)
}
if !key.Parameters().Equal(tc.params) {
t.Errorf("key.Parameters() = %v, want %v", key.Parameters(), tc.params)
}
if !key.KeyBytes().Equal(tc.key) {
t.Errorf("key.KeyBytes() = %v, want %v", key.KeyBytes(), tc.key)
}
id, required := key.IDRequirement()
if got, want := id, tc.idRequirement; got != tc.idRequirement {
t.Errorf("key.IDRequirement() = %v, _, want %v", got, want)
}
if got, want := required, tc.params.HasIDRequirement(); got != want {
t.Errorf("key.IDRequirement() = _, %v, want %v", got, want)
}
if diff := cmp.Diff(tc.wantOutputPrefix, key.OutputPrefix()); diff != "" {
t.Errorf("key.OutputPrefix() diff (-want +got):\n%s", diff)
}
// Test equality.
if !key.Equal(key) {
t.Errorf("key.Equal(key) = false, want true")
}
otherKey, err := aescmac.NewKey(tc.key, tc.params, tc.idRequirement)
if err != nil {
t.Fatalf("NewKey(%v, %v, %d) err = %v, want nil", tc.key, tc.params, tc.idRequirement, err)
}
if !key.Equal(otherKey) {
t.Errorf("key.Equal(otherKey) = false, want true")
}
})
}
}
func mustCreateKey(t *testing.T, key secretdata.Bytes, params *aescmac.Parameters, idRequirement uint32) *aescmac.Key {
t.Helper()
cmacKey, err := aescmac.NewKey(key, params, idRequirement)
if err != nil {
t.Fatalf("NewKey(%v, %v, %d) err = %v, want nil", key, params, idRequirement, err)
}
return cmacKey
}
func TestKeyEqualFalseIfDifferent(t *testing.T) {
for _, tc := range []struct {
name string
key1 *aescmac.Key
key2 *aescmac.Key
}{
{
name: "Different Key Bytes",
key1: mustCreateKey(t, aes128Key, mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantTink}), 0x01020304),
key2: mustCreateKey(t, secretdata.NewBytesFromData([]byte("0000000000000000"), insecuresecretdataaccess.Token{}), mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantTink}), 0x01020304),
},
{
name: "Different IDRequirement",
key1: mustCreateKey(t, aes128Key, mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantTink}), 0x01020304),
key2: mustCreateKey(t, aes128Key, mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 16, TagSizeInBytes: 16, Variant: aescmac.VariantTink}), 0x05060708),
},
{
name: "Different Parameters",
key1: mustCreateKey(t, aes256Key, mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 32, TagSizeInBytes: 16, Variant: aescmac.VariantTink}), 0x01020304),
key2: mustCreateKey(t, aes256Key, mustCreateParameters(t, aescmac.ParametersOpts{KeySizeInBytes: 32, TagSizeInBytes: 16, Variant: aescmac.VariantCrunchy}), 0x01020304),
},
} {
t.Run(tc.name, func(t *testing.T) {
if tc.key1.Equal(tc.key2) {
t.Errorf("key1.Equal(key2) = true, want false")
}
})
}
}
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