| // Copyright 2017 Google Inc. |
| // |
| // 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 aead_test |
| |
| import ( |
| "bytes" |
| "fmt" |
| "github.com/golang/protobuf/proto" |
| "github.com/google/tink/go/aead/aead" |
| "github.com/google/tink/go/subtle/aes" |
| "github.com/google/tink/go/subtle/random" |
| "github.com/google/tink/go/util/testutil" |
| "github.com/google/tink/go/util/util" |
| gcmpb "github.com/google/tink/proto/aes_gcm_go_proto" |
| tinkpb "github.com/google/tink/proto/tink_go_proto" |
| "testing" |
| ) |
| |
| var keySizes = []uint32{16, 24, 32} |
| |
| func TestNewAesGcmKeyManager(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| if keyManager == nil { |
| t.Errorf("NewAesGcmKeyManager() returns nil") |
| } |
| } |
| |
| func TestAesGcmGetPrimitiveBasic(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| for _, keySize := range keySizes { |
| key := testutil.NewAesGcmKey(uint32(keySize)) |
| p, err := keyManager.GetPrimitiveFromKey(key) |
| if err != nil { |
| t.Errorf("unexpected error: %s", err) |
| } |
| if err := validateAesGcmPrimitive(p, key); err != nil { |
| t.Errorf("%s", err) |
| } |
| |
| serializedKey, _ := proto.Marshal(key) |
| p, err = keyManager.GetPrimitiveFromSerializedKey(serializedKey) |
| if err != nil { |
| t.Errorf("unexpected error: %s", err) |
| } |
| if err := validateAesGcmPrimitive(p, key); err != nil { |
| t.Errorf("%s", err) |
| } |
| } |
| } |
| |
| func TestAesGcmGetPrimitiveWithInvalidInput(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| // invalid AesGcmKey |
| testKeys := genInvalidAesGcmKeys() |
| for i := 0; i < len(testKeys); i++ { |
| if _, err := keyManager.GetPrimitiveFromKey(testKeys[i]); err == nil { |
| t.Errorf("expect an error in test case %d", i) |
| } |
| serializedKey, _ := proto.Marshal(testKeys[i]) |
| if _, err := keyManager.GetPrimitiveFromSerializedKey(serializedKey); err == nil { |
| t.Errorf("expect an error in test case %d", i) |
| } |
| } |
| // nil |
| if _, err := keyManager.GetPrimitiveFromKey(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| if _, err := keyManager.GetPrimitiveFromSerializedKey(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| // empty array |
| if _, err := keyManager.GetPrimitiveFromSerializedKey([]byte{}); err == nil { |
| t.Errorf("expect an error when input is empty") |
| } |
| } |
| |
| func TestAesGcmNewKeyMultipleTimes(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| format := util.NewAesGcmKeyFormat(32) |
| serializedFormat, _ := proto.Marshal(format) |
| keys := make(map[string]bool) |
| nTest := 26 |
| for i := 0; i < nTest; i++ { |
| key, _ := keyManager.NewKeyFromSerializedKeyFormat(serializedFormat) |
| serializedKey, _ := proto.Marshal(key) |
| keys[string(serializedKey)] = true |
| |
| key, _ = keyManager.NewKeyFromKeyFormat(format) |
| serializedKey, _ = proto.Marshal(key) |
| keys[string(serializedKey)] = true |
| } |
| if len(keys) != nTest*2 { |
| t.Errorf("key is repeated") |
| } |
| } |
| |
| func TestAesGcmNewKeyBasic(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| for _, keySize := range keySizes { |
| format := util.NewAesGcmKeyFormat(uint32(keySize)) |
| m, err := keyManager.NewKeyFromKeyFormat(format) |
| if err != nil { |
| t.Errorf("unexpected error: %s", err) |
| } |
| key := m.(*gcmpb.AesGcmKey) |
| if err := validateAesGcmKey(key, format); err != nil { |
| t.Errorf("%s", err) |
| } |
| |
| serializedFormat, _ := proto.Marshal(format) |
| m, err = keyManager.NewKeyFromSerializedKeyFormat(serializedFormat) |
| if err != nil { |
| t.Errorf("unexpected error: %s", err) |
| } |
| key = m.(*gcmpb.AesGcmKey) |
| if err := validateAesGcmKey(key, format); err != nil { |
| t.Errorf("%s", err) |
| } |
| } |
| } |
| |
| func TestAesGcmNewKeyWithInvalidInput(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| // bad format |
| badFormats := genInvalidAesGcmKeyFormats() |
| for i := 0; i < len(badFormats); i++ { |
| if _, err := keyManager.NewKeyFromKeyFormat(badFormats[i]); err == nil { |
| t.Errorf("expect an error in test case %d", i) |
| } |
| serializedFormat, _ := proto.Marshal(badFormats[i]) |
| if _, err := keyManager.NewKeyFromSerializedKeyFormat(serializedFormat); err == nil { |
| t.Errorf("expect an error in test case %d", i) |
| } |
| } |
| // nil |
| if _, err := keyManager.NewKeyFromKeyFormat(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| if _, err := keyManager.NewKeyFromSerializedKeyFormat(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| // empty array |
| if _, err := keyManager.NewKeyFromSerializedKeyFormat([]byte{}); err == nil { |
| t.Errorf("expect an error when input is empty") |
| } |
| } |
| |
| func TestAesGcmNewKeyDataBasic(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| for _, keySize := range keySizes { |
| format := util.NewAesGcmKeyFormat(uint32(keySize)) |
| serializedFormat, _ := proto.Marshal(format) |
| keyData, err := keyManager.NewKeyData(serializedFormat) |
| if err != nil { |
| t.Errorf("unexpected error: %s", err) |
| } |
| if keyData.TypeUrl != aead.AES_GCM_TYPE_URL { |
| t.Errorf("incorrect type url") |
| } |
| if keyData.KeyMaterialType != tinkpb.KeyData_SYMMETRIC { |
| t.Errorf("incorrect key material type") |
| } |
| key := new(gcmpb.AesGcmKey) |
| if err := proto.Unmarshal(keyData.Value, key); err != nil { |
| t.Errorf("incorrect key value") |
| } |
| if err := validateAesGcmKey(key, format); err != nil { |
| t.Errorf("%s", err) |
| } |
| } |
| } |
| |
| func TestAesGcmNewKeyDataWithInvalidInput(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| badFormats := genInvalidAesGcmKeyFormats() |
| for i := 0; i < len(badFormats); i++ { |
| serializedFormat, _ := proto.Marshal(badFormats[i]) |
| if _, err := keyManager.NewKeyData(serializedFormat); err == nil { |
| t.Errorf("expect an error in test case %d", i) |
| } |
| } |
| // nil input |
| if _, err := keyManager.NewKeyData(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| // empty input |
| if _, err := keyManager.NewKeyData([]byte{}); err == nil { |
| t.Errorf("expect an error when input is empty") |
| } |
| } |
| |
| func TestAesGcmDoesSupport(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| if !keyManager.DoesSupport(aead.AES_GCM_TYPE_URL) { |
| t.Errorf("AesGcmKeyManager must support %s", aead.AES_GCM_TYPE_URL) |
| } |
| if keyManager.DoesSupport("some bad type") { |
| t.Errorf("AesGcmKeyManager must support only %s", aead.AES_GCM_TYPE_URL) |
| } |
| } |
| |
| func TestAesGcmGetKeyType(t *testing.T) { |
| keyManager := aead.NewAesGcmKeyManager() |
| if keyManager.GetKeyType() != aead.AES_GCM_TYPE_URL { |
| t.Errorf("incorrect key type") |
| } |
| } |
| |
| func genInvalidAesGcmKeys() []proto.Message { |
| return []proto.Message{ |
| // not a AesGcmKey |
| util.NewAesGcmKeyFormat(32), |
| // bad key size |
| util.NewAesGcmKey(aead.AES_GCM_KEY_VERSION, random.GetRandomBytes(17)), |
| util.NewAesGcmKey(aead.AES_GCM_KEY_VERSION, random.GetRandomBytes(25)), |
| util.NewAesGcmKey(aead.AES_GCM_KEY_VERSION, random.GetRandomBytes(33)), |
| // bad version |
| util.NewAesGcmKey(aead.AES_GCM_KEY_VERSION+1, random.GetRandomBytes(16)), |
| } |
| } |
| |
| func genInvalidAesGcmKeyFormats() []proto.Message { |
| return []proto.Message{ |
| // not AesGcmKeyFormat |
| util.NewAesGcmKey(aead.AES_GCM_KEY_VERSION, random.GetRandomBytes(16)), |
| // invalid key size |
| util.NewAesGcmKeyFormat(uint32(15)), |
| util.NewAesGcmKeyFormat(uint32(23)), |
| util.NewAesGcmKeyFormat(uint32(31)), |
| } |
| } |
| |
| func validateAesGcmKey(key *gcmpb.AesGcmKey, format *gcmpb.AesGcmKeyFormat) error { |
| if uint32(len(key.KeyValue)) != format.KeySize { |
| return fmt.Errorf("incorrect key size") |
| } |
| if key.Version != aead.AES_GCM_KEY_VERSION { |
| return fmt.Errorf("incorrect key version") |
| } |
| // try to encrypt and decrypt |
| p, err := aes.NewAesGcm(key.KeyValue) |
| if err != nil { |
| return fmt.Errorf("invalid key") |
| } |
| return validateAesGcmPrimitive(p, key) |
| } |
| |
| func validateAesGcmPrimitive(p interface{}, key *gcmpb.AesGcmKey) error { |
| cipher := p.(*aes.AesGcm) |
| if !bytes.Equal(cipher.Key, key.KeyValue) { |
| return fmt.Errorf("key and primitive don't match") |
| } |
| // try to encrypt and decrypt |
| pt := random.GetRandomBytes(32) |
| aad := random.GetRandomBytes(32) |
| ct, err := cipher.Encrypt(pt, aad) |
| if err != nil { |
| return fmt.Errorf("encryption failed") |
| } |
| decrypted, err := cipher.Decrypt(ct, aad) |
| if err != nil { |
| return fmt.Errorf("decryption failed") |
| } |
| if !bytes.Equal(decrypted, pt) { |
| return fmt.Errorf("decryption failed") |
| } |
| return nil |
| } |
