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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_test
import (
"bytes"
"fmt"
"testing"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/keyderivation"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/prf"
"github.com/tink-crypto/tink-go/v2/subtle/random"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
func TestPRFBasedKeyTemplateDerivesAESGCMKeyset(t *testing.T) {
plaintext := random.GetRandomBytes(16)
associatedData := random.GetRandomBytes(8)
prfs := []struct {
name string
template *tinkpb.KeyTemplate
}{
{
name: "HKDF-SHA256",
template: prf.HKDFSHA256PRFKeyTemplate(),
},
}
derivations := []struct {
name string
template *tinkpb.KeyTemplate
}{
{
name: "AES128GCM",
template: aead.AES128GCMKeyTemplate(),
},
{
name: "AES256GCM",
template: aead.AES256GCMKeyTemplate(),
},
{
name: "AES256GCMNoPrefix",
template: aead.AES256GCMNoPrefixKeyTemplate(),
},
}
for _, prf := range prfs {
for _, der := range derivations {
for _, salt := range [][]byte{nil, []byte("salt")} {
name := fmt.Sprintf("%s_%s", prf.name, der.name)
if salt != nil {
name += "_with_salt"
}
t.Run(name, func(t *testing.T) {
template, err := keyderivation.CreatePRFBasedKeyTemplate(prf.template, der.template)
if err != nil {
t.Fatalf("CreatePRFBasedKeyTemplate() err = %v, want nil", err)
}
handle, err := keyset.NewHandle(template)
if err != nil {
t.Fatalf("keyset.NewHandle() err = %v, want nil", err)
}
d, err := keyderivation.New(handle)
if err != nil {
t.Fatalf("keyderivation.New() err = %v, want nil", err)
}
derivedHandle, err := d.DeriveKeyset(salt)
if err != nil {
t.Fatalf("DeriveKeyset() err = %v, want nil", err)
}
a, err := aead.New(derivedHandle)
if err != nil {
t.Fatalf("aead.New() err = %v, want nil", err)
}
ciphertext, err := a.Encrypt(plaintext, associatedData)
if err != nil {
t.Fatalf("Encrypt() err = %v, want nil", err)
}
gotPlaintext, err := a.Decrypt(ciphertext, associatedData)
if err != nil {
t.Fatalf("Decrypt() err = %v, want nil", err)
}
if !bytes.Equal(gotPlaintext, plaintext) {
t.Errorf("Decrypt() = %v, want %v", gotPlaintext, plaintext)
}
})
}
}
}
}
func TestInvalidPRFBasedDeriverKeyTemplates(t *testing.T) {
for _, test := range []struct {
name string
prfKeyTemplate *tinkpb.KeyTemplate
derivedKeyTemplate *tinkpb.KeyTemplate
}{
{
name: "nil templates",
},
{
name: "nil PRF key template",
derivedKeyTemplate: aead.AES128GCMKeyTemplate(),
},
{
name: "nil derived key template",
prfKeyTemplate: prf.HKDFSHA256PRFKeyTemplate(),
},
{
name: "malformed PRF key template",
prfKeyTemplate: &tinkpb.KeyTemplate{TypeUrl: "\xff"},
derivedKeyTemplate: aead.AES128GCMKeyTemplate(),
},
// AES128CTRHMACSHA256KeyTemplate() is an unsupported derived key template
// because DeriveKey() is not implemented in the AES-CTR-HMAC key manager.
// TODO(b/227682336): Add mock key manager that doesn't derive keys.
{
name: "unsupported templates",
prfKeyTemplate: aead.AES128GCMKeyTemplate(),
derivedKeyTemplate: aead.AES128CTRHMACSHA256KeyTemplate()},
{
name: "unsupported PRF key template",
prfKeyTemplate: aead.AES128GCMKeyTemplate(),
derivedKeyTemplate: aead.AES128GCMKeyTemplate(),
},
{
name: "unsupported derived key template",
prfKeyTemplate: prf.HKDFSHA256PRFKeyTemplate(),
derivedKeyTemplate: aead.AES128CTRHMACSHA256KeyTemplate(),
},
} {
t.Run(test.name, func(t *testing.T) {
if _, err := keyderivation.CreatePRFBasedKeyTemplate(test.prfKeyTemplate, test.derivedKeyTemplate); err == nil {
t.Error("CreatePRFBasedKeyTemplate() err = nil, want non-nil")
}
})
}
}
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