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// Copyright 2022 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 keyderivation
import (
"strings"
"testing"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/core/cryptofmt"
"github.com/tink-crypto/tink-go/v2/internal/primitiveset"
"github.com/tink-crypto/tink-go/v2/keyset"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// invalidDeriver returns two keys, but wrappedKeysetDeriver accepts only one.
type invalidDeriver struct{}
var _ KeysetDeriver = (*invalidDeriver)(nil)
func (i *invalidDeriver) DeriveKeyset(salt []byte) (*keyset.Handle, error) {
manager := keyset.NewManager()
keyID, err := manager.Add(aead.AES128GCMKeyTemplate())
if err != nil {
return nil, err
}
manager.SetPrimary(keyID)
if _, err = manager.Add(aead.AES256GCMKeyTemplate()); err != nil {
return nil, err
}
return manager.Handle()
}
func TestDeriveKeysetWithInvalidPrimitiveImplementationFails(t *testing.T) {
entry := &primitiveset.Entry[KeysetDeriver]{
KeyID: 119,
Primitive: &invalidDeriver{},
Prefix: cryptofmt.RawPrefix,
Status: tinkpb.KeyStatusType_ENABLED,
TypeURL: "type.googleapis.com/google.crypto.tink.PrfBasedDeriverKey",
}
ps := &primitiveset.PrimitiveSet[KeysetDeriver]{
Primary: entry,
Entries: map[string][]*primitiveset.Entry[KeysetDeriver]{
cryptofmt.RawPrefix: []*primitiveset.Entry[KeysetDeriver]{entry},
},
EntriesInKeysetOrder: []*primitiveset.Entry[KeysetDeriver]{entry},
}
wrappedDeriver := &wrappedKeysetDeriver{ps: ps}
_, err := wrappedDeriver.DeriveKeyset([]byte("salt"))
if err == nil {
t.Fatal("DeriveKeyset() err = nil, want non-nil")
}
if !strings.Contains(err.Error(), "exactly one key") {
t.Errorf("DeriveKeyset() err = %q, doesn't contain %q", err, "exactly one key")
}
}
func TestNewWrappedKeysetDeriverWrongPrimitiveFails(t *testing.T) {
handle, err := keyset.NewHandle(aead.AES128GCMKeyTemplate())
if err != nil {
t.Fatalf("keyset.NewHandle() err = %v, want nil", err)
}
if _, err := New(handle); err == nil {
t.Errorf("New() err = nil, want non-nil")
}
}
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