go/streamingaead/aes_gcm_hkdf_key_manager_test.go - third_party/tink - Git at Google

 // 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 streamingaead_test

 import (
 	"bytes"
 	"fmt"
 	"testing"

 	"github.com/golang/protobuf/proto"
 	"github.com/google/tink/go/core/registry"
 	"github.com/google/tink/go/streamingaead/subtle"
 	"github.com/google/tink/go/testutil"
 	gcmhkdfpb "github.com/google/tink/go/proto/aes_gcm_hkdf_streaming_go_proto"
 	commonpb "github.com/google/tink/go/proto/common_go_proto"
 	tinkpb "github.com/google/tink/go/proto/tink_go_proto"
 )

 var aesGCMHKDFKeySizes = []uint32{16, 32}

 func TestAESGCMHKDFGetPrimitiveBasic(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	for _, keySize := range aesGCMHKDFKeySizes {
 		key := testutil.NewAESGCMHKDFKey(testutil.AESGCMHKDFKeyVersion, keySize, keySize, commonpb.HashType_SHA256, 4096)
 		serializedKey, err := proto.Marshal(key)
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		p, err := keyManager.Primitive(serializedKey)
 		if err != nil {
 			t.Errorf("unexpected error: %s", err)
 		}
 		if err := validatePrimitive(p, key); err != nil {
 			t.Errorf("%s", err)
 		}
 	}
 }

 func TestAESGCMHKDFGetPrimitiveWithInvalidInput(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}

 	testKeys := genInvalidAESGCMHKDFKeys()
 	for i := 0; i < len(testKeys); i++ {
 		serializedKey, err := proto.Marshal(testKeys[i])
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		if _, err := keyManager.Primitive(serializedKey); err == nil {
 			t.Errorf("expect an error in test case %d", i)
 		}
 	}

 	if _, err := keyManager.Primitive(nil); err == nil {
 		t.Errorf("expect an error when input is nil")
 	}
 	if _, err := keyManager.Primitive([]byte{}); err == nil {
 		t.Errorf("expect an error when input is empty")
 	}
 }

 func TestAESGCMHKDFNewKeyMultipleTimes(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	format := testutil.NewAESGCMHKDFKeyFormat(32, 32, commonpb.HashType_SHA256, 4096)
 	serializedFormat, err := proto.Marshal(format)
 	if err != nil {
 		t.Errorf("failed to marshal key: %s", err)
 	}
 	keys := make(map[string]struct{})
 	n := 26
 	for i := 0; i < n; i++ {
 		key, _ := keyManager.NewKey(serializedFormat)
 		serializedKey, err := proto.Marshal(key)
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		keys[string(serializedKey)] = struct{}{}

 		keyData, _ := keyManager.NewKeyData(serializedFormat)
 		serializedKey = keyData.Value
 		keys[string(serializedKey)] = struct{}{}
 	}
 	if len(keys) != n*2 {
 		t.Errorf("key is repeated")
 	}
 }

 func TestAESGCMHKDFNewKeyBasic(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	for _, keySize := range aesGCMHKDFKeySizes {
 		format := testutil.NewAESGCMHKDFKeyFormat(
 			keySize,
 			keySize,
 			commonpb.HashType_SHA256,
 			4096,
 		)
 		serializedFormat, err := proto.Marshal(format)
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		m, err := keyManager.NewKey(serializedFormat)
 		if err != nil {
 			t.Errorf("unexpected error: %s", err)
 		}
 		key := m.(*gcmhkdfpb.AesGcmHkdfStreamingKey)
 		if err := validateAESGCMHKDFKey(key, format); err != nil {
 			t.Errorf("%s", err)
 		}
 	}
 }

 func TestAESGCMHKDFNewKeyWithInvalidInput(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	// bad format
 	badFormats := genInvalidAESGCMHKDFKeyFormats()
 	for i := 0; i < len(badFormats); i++ {
 		serializedFormat, err := proto.Marshal(badFormats[i])
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		if _, err := keyManager.NewKey(serializedFormat); err == nil {
 			t.Errorf("expect an error in test case %d", i)
 		}
 	}
 	// nil
 	if _, err := keyManager.NewKey(nil); err == nil {
 		t.Errorf("expect an error when input is nil")
 	}
 	// empty array
 	if _, err := keyManager.NewKey([]byte{}); err == nil {
 		t.Errorf("expect an error when input is empty")
 	}
 }

 func TestAESGCMHKDFNewKeyDataBasic(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	for _, keySize := range aesGCMHKDFKeySizes {
 		format := testutil.NewAESGCMHKDFKeyFormat(
 			keySize,
 			keySize,
 			commonpb.HashType_SHA256,
 			4096,
 		)
 		serializedFormat, err := proto.Marshal(format)
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		keyData, err := keyManager.NewKeyData(serializedFormat)
 		if err != nil {
 			t.Errorf("unexpected error: %s", err)
 		}
 		if keyData.TypeUrl != testutil.AESGCMHKDFTypeURL {
 			t.Errorf("incorrect type url")
 		}
 		if keyData.KeyMaterialType != tinkpb.KeyData_SYMMETRIC {
 			t.Errorf("incorrect key material type")
 		}
 		key := new(gcmhkdfpb.AesGcmHkdfStreamingKey)
 		if err := proto.Unmarshal(keyData.Value, key); err != nil {
 			t.Errorf("incorrect key value")
 		}
 		if err := validateAESGCMHKDFKey(key, format); err != nil {
 			t.Errorf("%s", err)
 		}
 	}
 }

 func TestAESGCMHKDFNewKeyDataWithInvalidInput(t *testing.T) {
 	km, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	badFormats := genInvalidAESGCMHKDFKeyFormats()
 	for i := 0; i < len(badFormats); i++ {
 		serializedFormat, err := proto.Marshal(badFormats[i])
 		if err != nil {
 			t.Errorf("failed to marshal key: %s", err)
 		}
 		if _, err := km.NewKeyData(serializedFormat); err == nil {
 			t.Errorf("expect an error in test case %d", i)
 		}
 	}
 	// nil input
 	if _, err := km.NewKeyData(nil); err == nil {
 		t.Errorf("expect an error when input is nil")
 	}
 	// empty input
 	if _, err := km.NewKeyData([]byte{}); err == nil {
 		t.Errorf("expect an error when input is empty")
 	}
 }

 func TestAESGCMHKDFDoesSupport(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	if !keyManager.DoesSupport(testutil.AESGCMHKDFTypeURL) {
 		t.Errorf("AESGCMHKDFKeyManager must support %s", testutil.AESGCMHKDFTypeURL)
 	}
 	if keyManager.DoesSupport("some bad type") {
 		t.Errorf("AESGCMHKDFKeyManager must support only %s", testutil.AESGCMHKDFTypeURL)
 	}
 }

 func TestAESGCMHKDFTypeURL(t *testing.T) {
 	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
 	if err != nil {
 		t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
 	}
 	if keyManager.TypeURL() != testutil.AESGCMHKDFTypeURL {
 		t.Errorf("incorrect key type")
 	}
 }

 func genInvalidAESGCMHKDFKeys() []proto.Message {
 	return []proto.Message{
 		// not a AESGCMHKDFKey
 		testutil.NewAESGCMHKDFKeyFormat(32, 32, commonpb.HashType_SHA256, 4096),
 		// bad key size
 		testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 17, 16, commonpb.HashType_SHA256, 4096),
 		testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 16, 17, commonpb.HashType_SHA256, 4096),
 		testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 33, 33, commonpb.HashType_SHA256, 4096),
 		// bad version
 		testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion+1, 16, 16, commonpb.HashType_SHA256, 4096),
 	}
 }

 func genInvalidAESGCMHKDFKeyFormats() []proto.Message {
 	return []proto.Message{
 		// not AESGCMKeyFormat
 		testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 16, 16, commonpb.HashType_SHA256, 16),
 		// invalid key size
 		testutil.NewAESGCMHKDFKeyFormat(17, 16, commonpb.HashType_SHA256, 4096),
 		testutil.NewAESGCMHKDFKeyFormat(16, 17, commonpb.HashType_SHA256, 4096),
 		testutil.NewAESGCMHKDFKeyFormat(33, 33, commonpb.HashType_SHA256, 4096),
 	}
 }

 func validateAESGCMHKDFKey(key *gcmhkdfpb.AesGcmHkdfStreamingKey, format *gcmhkdfpb.AesGcmHkdfStreamingKeyFormat) error {
 	if uint32(len(key.KeyValue)) != format.KeySize {
 		return fmt.Errorf("incorrect key size")
 	}
 	if key.Version != testutil.AESGCMKeyVersion {
 		return fmt.Errorf("incorrect key version")
 	}
 	if key.Params.CiphertextSegmentSize != format.Params.CiphertextSegmentSize {
 		return fmt.Errorf("incorrect ciphertext segment size")
 	}
 	if key.Params.DerivedKeySize != format.Params.DerivedKeySize {
 		return fmt.Errorf("incorrect derived key size")
 	}
 	if key.Params.HkdfHashType != format.Params.HkdfHashType {
 		return fmt.Errorf("incorrect HKDF hash type")
 	}
 	// try to encrypt and decrypt
 	p, err := subtle.NewAESGCMHKDF(
 		key.KeyValue,
 		key.Params.HkdfHashType.String(),
 		int(key.Params.DerivedKeySize),
 		int(key.Params.CiphertextSegmentSize),
 		0,
 	)
 	if err != nil {
 		return fmt.Errorf("invalid key")
 	}
 	return validatePrimitive(p, key)
 }

 func validatePrimitive(p interface{}, key *gcmhkdfpb.AesGcmHkdfStreamingKey) error {
 	cipher := p.(*subtle.AESGCMHKDF)
 	if !bytes.Equal(cipher.MainKey, key.KeyValue) {
 		return fmt.Errorf("main key and primitive don't match")
 	}
 	return encryptDecrypt(cipher, cipher, 32, 32)
 }
	// 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 streamingaead_test

	import (
	"bytes"
	"fmt"
	"testing"

	"github.com/golang/protobuf/proto"
	"github.com/google/tink/go/core/registry"
	"github.com/google/tink/go/streamingaead/subtle"
	"github.com/google/tink/go/testutil"
	gcmhkdfpb "github.com/google/tink/go/proto/aes_gcm_hkdf_streaming_go_proto"
	commonpb "github.com/google/tink/go/proto/common_go_proto"
	tinkpb "github.com/google/tink/go/proto/tink_go_proto"
	)

	var aesGCMHKDFKeySizes = []uint32{16, 32}

	func TestAESGCMHKDFGetPrimitiveBasic(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	for _, keySize := range aesGCMHKDFKeySizes {
	key := testutil.NewAESGCMHKDFKey(testutil.AESGCMHKDFKeyVersion, keySize, keySize, commonpb.HashType_SHA256, 4096)
	serializedKey, err := proto.Marshal(key)
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	p, err := keyManager.Primitive(serializedKey)
	if err != nil {
	t.Errorf("unexpected error: %s", err)
	}
	if err := validatePrimitive(p, key); err != nil {
	t.Errorf("%s", err)
	}
	}
	}

	func TestAESGCMHKDFGetPrimitiveWithInvalidInput(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}

	testKeys := genInvalidAESGCMHKDFKeys()
	for i := 0; i < len(testKeys); i++ {
	serializedKey, err := proto.Marshal(testKeys[i])
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	if _, err := keyManager.Primitive(serializedKey); err == nil {
	t.Errorf("expect an error in test case %d", i)
	}
	}

	if _, err := keyManager.Primitive(nil); err == nil {
	t.Errorf("expect an error when input is nil")
	}
	if _, err := keyManager.Primitive([]byte{}); err == nil {
	t.Errorf("expect an error when input is empty")
	}
	}

	func TestAESGCMHKDFNewKeyMultipleTimes(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	format := testutil.NewAESGCMHKDFKeyFormat(32, 32, commonpb.HashType_SHA256, 4096)
	serializedFormat, err := proto.Marshal(format)
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	keys := make(map[string]struct{})
	n := 26
	for i := 0; i < n; i++ {
	key, _ := keyManager.NewKey(serializedFormat)
	serializedKey, err := proto.Marshal(key)
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	keys[string(serializedKey)] = struct{}{}

	keyData, _ := keyManager.NewKeyData(serializedFormat)
	serializedKey = keyData.Value
	keys[string(serializedKey)] = struct{}{}
	}
	if len(keys) != n*2 {
	t.Errorf("key is repeated")
	}
	}

	func TestAESGCMHKDFNewKeyBasic(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	for _, keySize := range aesGCMHKDFKeySizes {
	format := testutil.NewAESGCMHKDFKeyFormat(
	keySize,
	keySize,
	commonpb.HashType_SHA256,
	4096,
	)
	serializedFormat, err := proto.Marshal(format)
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	m, err := keyManager.NewKey(serializedFormat)
	if err != nil {
	t.Errorf("unexpected error: %s", err)
	}
	key := m.(*gcmhkdfpb.AesGcmHkdfStreamingKey)
	if err := validateAESGCMHKDFKey(key, format); err != nil {
	t.Errorf("%s", err)
	}
	}
	}

	func TestAESGCMHKDFNewKeyWithInvalidInput(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	// bad format
	badFormats := genInvalidAESGCMHKDFKeyFormats()
	for i := 0; i < len(badFormats); i++ {
	serializedFormat, err := proto.Marshal(badFormats[i])
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	if _, err := keyManager.NewKey(serializedFormat); err == nil {
	t.Errorf("expect an error in test case %d", i)
	}
	}
	// nil
	if _, err := keyManager.NewKey(nil); err == nil {
	t.Errorf("expect an error when input is nil")
	}
	// empty array
	if _, err := keyManager.NewKey([]byte{}); err == nil {
	t.Errorf("expect an error when input is empty")
	}
	}

	func TestAESGCMHKDFNewKeyDataBasic(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	for _, keySize := range aesGCMHKDFKeySizes {
	format := testutil.NewAESGCMHKDFKeyFormat(
	keySize,
	keySize,
	commonpb.HashType_SHA256,
	4096,
	)
	serializedFormat, err := proto.Marshal(format)
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	keyData, err := keyManager.NewKeyData(serializedFormat)
	if err != nil {
	t.Errorf("unexpected error: %s", err)
	}
	if keyData.TypeUrl != testutil.AESGCMHKDFTypeURL {
	t.Errorf("incorrect type url")
	}
	if keyData.KeyMaterialType != tinkpb.KeyData_SYMMETRIC {
	t.Errorf("incorrect key material type")
	}
	key := new(gcmhkdfpb.AesGcmHkdfStreamingKey)
	if err := proto.Unmarshal(keyData.Value, key); err != nil {
	t.Errorf("incorrect key value")
	}
	if err := validateAESGCMHKDFKey(key, format); err != nil {
	t.Errorf("%s", err)
	}
	}
	}

	func TestAESGCMHKDFNewKeyDataWithInvalidInput(t *testing.T) {
	km, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	badFormats := genInvalidAESGCMHKDFKeyFormats()
	for i := 0; i < len(badFormats); i++ {
	serializedFormat, err := proto.Marshal(badFormats[i])
	if err != nil {
	t.Errorf("failed to marshal key: %s", err)
	}
	if _, err := km.NewKeyData(serializedFormat); err == nil {
	t.Errorf("expect an error in test case %d", i)
	}
	}
	// nil input
	if _, err := km.NewKeyData(nil); err == nil {
	t.Errorf("expect an error when input is nil")
	}
	// empty input
	if _, err := km.NewKeyData([]byte{}); err == nil {
	t.Errorf("expect an error when input is empty")
	}
	}

	func TestAESGCMHKDFDoesSupport(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	if !keyManager.DoesSupport(testutil.AESGCMHKDFTypeURL) {
	t.Errorf("AESGCMHKDFKeyManager must support %s", testutil.AESGCMHKDFTypeURL)
	}
	if keyManager.DoesSupport("some bad type") {
	t.Errorf("AESGCMHKDFKeyManager must support only %s", testutil.AESGCMHKDFTypeURL)
	}
	}

	func TestAESGCMHKDFTypeURL(t *testing.T) {
	keyManager, err := registry.GetKeyManager(testutil.AESGCMHKDFTypeURL)
	if err != nil {
	t.Errorf("cannot obtain AES-GCM-HKDF key manager: %s", err)
	}
	if keyManager.TypeURL() != testutil.AESGCMHKDFTypeURL {
	t.Errorf("incorrect key type")
	}
	}

	func genInvalidAESGCMHKDFKeys() []proto.Message {
	return []proto.Message{
	// not a AESGCMHKDFKey
	testutil.NewAESGCMHKDFKeyFormat(32, 32, commonpb.HashType_SHA256, 4096),
	// bad key size
	testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 17, 16, commonpb.HashType_SHA256, 4096),
	testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 16, 17, commonpb.HashType_SHA256, 4096),
	testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 33, 33, commonpb.HashType_SHA256, 4096),
	// bad version
	testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion+1, 16, 16, commonpb.HashType_SHA256, 4096),
	}
	}

	func genInvalidAESGCMHKDFKeyFormats() []proto.Message {
	return []proto.Message{
	// not AESGCMKeyFormat
	testutil.NewAESGCMHKDFKey(testutil.AESGCMKeyVersion, 16, 16, commonpb.HashType_SHA256, 16),
	// invalid key size
	testutil.NewAESGCMHKDFKeyFormat(17, 16, commonpb.HashType_SHA256, 4096),
	testutil.NewAESGCMHKDFKeyFormat(16, 17, commonpb.HashType_SHA256, 4096),
	testutil.NewAESGCMHKDFKeyFormat(33, 33, commonpb.HashType_SHA256, 4096),
	}
	}

	func validateAESGCMHKDFKey(key gcmhkdfpb.AesGcmHkdfStreamingKey, format gcmhkdfpb.AesGcmHkdfStreamingKeyFormat) error {
	if uint32(len(key.KeyValue)) != format.KeySize {
	return fmt.Errorf("incorrect key size")
	}
	if key.Version != testutil.AESGCMKeyVersion {
	return fmt.Errorf("incorrect key version")
	}
	if key.Params.CiphertextSegmentSize != format.Params.CiphertextSegmentSize {
	return fmt.Errorf("incorrect ciphertext segment size")
	}
	if key.Params.DerivedKeySize != format.Params.DerivedKeySize {
	return fmt.Errorf("incorrect derived key size")
	}
	if key.Params.HkdfHashType != format.Params.HkdfHashType {
	return fmt.Errorf("incorrect HKDF hash type")
	}
	// try to encrypt and decrypt
	p, err := subtle.NewAESGCMHKDF(
	key.KeyValue,
	key.Params.HkdfHashType.String(),
	int(key.Params.DerivedKeySize),
	int(key.Params.CiphertextSegmentSize),
	0,
	)
	if err != nil {
	return fmt.Errorf("invalid key")
	}
	return validatePrimitive(p, key)
	}

	func validatePrimitive(p interface{}, key *gcmhkdfpb.AesGcmHkdfStreamingKey) error {
	cipher := p.(*subtle.AESGCMHKDF)
	if !bytes.Equal(cipher.MainKey, key.KeyValue) {
	return fmt.Errorf("main key and primitive don't match")
	}
	return encryptDecrypt(cipher, cipher, 32, 32)
	}