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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 streamingprf_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/keyderivation/internal/streamingprf"
"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"
"github.com/tink-crypto/tink-go/v2/testkeyset"
commonpb "github.com/tink-crypto/tink-go/v2/proto/common_go_proto"
hkdfpb "github.com/tink-crypto/tink-go/v2/proto/hkdf_prf_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
func TestNew(t *testing.T) {
keyData, err := registry.NewKeyData(prf.HKDFSHA256PRFKeyTemplate())
if err != nil {
t.Fatalf("registry.NewKeyData() err = %v", err)
}
ks := &tinkpb.Keyset{
PrimaryKeyId: 119,
Key: []*tinkpb.Keyset_Key{
&tinkpb.Keyset_Key{
KeyData: keyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: 119,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
},
},
}
handle, err := testkeyset.NewHandle(ks)
if err != nil {
t.Fatalf("testkeyset.NewHandle(ks) err = %v, want nil", err)
}
prf, err := streamingprf.New(handle)
if err != nil {
t.Fatalf("streamingprf.New() err = %v, want nil", err)
}
r, err := prf.Compute(random.GetRandomBytes(32))
if err != nil {
t.Fatalf("prf.Compute() err = %v, want nil", err)
}
limit := limitFromHash(t, commonpb.HashType_SHA256)
out := make([]byte, limit)
n, err := r.Read(out)
if n != limit || err != nil {
t.Errorf("Read() bytes = %d, want %d: %v", n, limit, err)
}
}
func TestNewEqualToStreamingPRFPrimitive(t *testing.T) {
streamingPRFKM := streamingprf.HKDFStreamingPRFKeyManager{}
prfKM, err := registry.GetKeyManager(hkdfPRFTypeURL)
if err != nil {
t.Fatalf("GetKeyManager(%s) err = %v, want nil", hkdfPRFTypeURL, err)
}
for _, test := range []struct {
name string
hash commonpb.HashType
salt []byte
}{
{
name: "SHA256_nil_salt",
hash: commonpb.HashType_SHA256,
},
{
name: "SHA256_random_salt",
hash: commonpb.HashType_SHA256,
salt: random.GetRandomBytes(16),
},
{
name: "SHA512_nil_salt",
hash: commonpb.HashType_SHA512,
},
{
name: "SHA512_random_salt",
hash: commonpb.HashType_SHA512,
salt: random.GetRandomBytes(16),
},
} {
t.Run(test.name, func(t *testing.T) {
// Construct shared key data.
keyFormat := &hkdfpb.HkdfPrfKeyFormat{
Params: &hkdfpb.HkdfPrfParams{
Hash: test.hash,
Salt: test.salt,
},
KeySize: 32,
Version: 0,
}
serializedKeyFormat, err := proto.Marshal(keyFormat)
if err != nil {
t.Fatalf("proto.Marshal(%v) err = %v, want nil", keyFormat, err)
}
sharedKeyData, err := prfKM.NewKeyData(serializedKeyFormat)
if err != nil {
t.Fatalf("NewKeyData() err = %v, want nil", err)
}
// Use shared key data to create StreamingPRF using New().
var primaryKeyID uint32 = 12
handle, err := testkeyset.NewHandle(
&tinkpb.Keyset{
PrimaryKeyId: primaryKeyID,
Key: []*tinkpb.Keyset_Key{
&tinkpb.Keyset_Key{
KeyData: sharedKeyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: primaryKeyID,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
},
},
})
if err != nil {
t.Fatalf("testkeyset.NewHandle() err = %v, want nil", err)
}
gotPRF, err := streamingprf.New(handle)
if err != nil {
t.Fatalf("streamingprf.New() err = %v, want nil", err)
}
// Use shared key data to create StreamingPRF using Primitive().
p, err := streamingPRFKM.Primitive(sharedKeyData.GetValue())
if err != nil {
t.Fatalf("Primitive() err = %v, want nil", err)
}
wantPRF, ok := p.(streamingprf.StreamingPRF)
if !ok {
t.Fatal("primitive is not StreamingPRF")
}
// Verify both PRFs return the same results.
limit := limitFromHash(t, test.hash)
got, want := make([]byte, limit), make([]byte, limit)
data := random.GetRandomBytes(32)
{
r, err := gotPRF.Compute(data)
if err != nil {
t.Fatalf("Compute() err = %v, want nil", err)
}
n, err := r.Read(got)
if n != limit || err != nil {
t.Fatalf("Read() bytes = %d, want %d: %v", n, limit, err)
}
}
{
r, err := wantPRF.Compute(data)
if err != nil {
t.Fatalf("Compute() err = %v, want nil", err)
}
n, err := r.Read(want)
if n != limit || err != nil {
t.Fatalf("Read() bytes = %d, want %d: %v", n, limit, err)
}
}
if !bytes.Equal(got, want) {
t.Errorf("Read() = %v, want %v", got, want)
}
})
}
}
func TestNewRejectsIncorrectKeysetHandle(t *testing.T) {
if _, err := streamingprf.New(nil); err == nil {
t.Error("streamingprf.New() err = nil, want non-nil")
}
aeadHandle, err := keyset.NewHandle(aead.AES128GCMKeyTemplate())
if err != nil {
t.Fatalf("keyset.NewHandle() err = %v, want nil", err)
}
if _, err := streamingprf.New(aeadHandle); err == nil {
t.Error("streamingprf.New() err = nil, want non-nil")
}
}
func TestNewRejectsInvalidKeysetHandle(t *testing.T) {
keyData, err := registry.NewKeyData(prf.HKDFSHA256PRFKeyTemplate())
if err != nil {
t.Fatalf("registry.NewKeyData() err = %v", err)
}
for _, test := range []struct {
name string
keyset *tinkpb.Keyset
}{
{
"multiple raw keys",
&tinkpb.Keyset{
PrimaryKeyId: 119,
Key: []*tinkpb.Keyset_Key{
&tinkpb.Keyset_Key{
KeyData: keyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: 119,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
},
&tinkpb.Keyset_Key{
KeyData: keyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: 200,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
},
},
},
},
{
"various output prefix keys",
&tinkpb.Keyset{
PrimaryKeyId: 119,
Key: []*tinkpb.Keyset_Key{
&tinkpb.Keyset_Key{
KeyData: keyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: 119,
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
},
&tinkpb.Keyset_Key{
KeyData: keyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: 200,
OutputPrefixType: tinkpb.OutputPrefixType_TINK,
},
},
},
},
{
"invalid prefix type",
&tinkpb.Keyset{
PrimaryKeyId: 119,
Key: []*tinkpb.Keyset_Key{
&tinkpb.Keyset_Key{
KeyData: keyData,
Status: tinkpb.KeyStatusType_ENABLED,
KeyId: 119,
OutputPrefixType: tinkpb.OutputPrefixType_TINK,
},
},
}},
} {
t.Run(test.name, func(t *testing.T) {
handle, err := testkeyset.NewHandle(test.keyset)
if err != nil {
t.Fatalf("testkeyset.NewHandle(test.keyset) err = %v, want nil", err)
}
if _, err := streamingprf.New(handle); err == nil {
t.Error("streamingprf.New() err = nil, want non-nil")
}
})
}
}
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