| // 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 prf_test |
| |
| import ( |
| "encoding/hex" |
| "fmt" |
| "testing" |
| |
| "github.com/golang/protobuf/proto" |
| "github.com/google/tink/go/core/registry" |
| "github.com/google/tink/go/prf" |
| "github.com/google/tink/go/prf/subtle" |
| "github.com/google/tink/go/subtle/random" |
| "github.com/google/tink/go/testutil" |
| cmacpb "github.com/google/tink/go/proto/aes_cmac_prf_go_proto" |
| commonpb "github.com/google/tink/go/proto/common_go_proto" |
| tinkpb "github.com/google/tink/go/proto/tink_go_proto" |
| ) |
| |
| func TestGetPrimitiveCMACBasic(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("AES CMAC PRF key manager not found: %s", err) |
| } |
| testKeys := genValidCMACKeys() |
| for i := 0; i < len(testKeys); i++ { |
| serializedKey, _ := proto.Marshal(testKeys[i]) |
| p, err := km.Primitive(serializedKey) |
| if err != nil { |
| t.Errorf("unexpected error in test case %d: %s", i, err) |
| } |
| if err := validateCMACPrimitive(p, testKeys[i]); err != nil { |
| t.Errorf("%s", err) |
| } |
| } |
| } |
| |
| func TestGetPrimitiveCMACWithInvalidInput(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain AES CMAC PRF key manager: %s", err) |
| } |
| // invalid key |
| testKeys := genInvalidCMACKeys() |
| for i := 0; i < len(testKeys); i++ { |
| serializedKey, _ := proto.Marshal(testKeys[i]) |
| if _, err := km.Primitive(serializedKey); err == nil { |
| t.Errorf("expect an error in test case %d", i) |
| } |
| } |
| if _, err := km.Primitive(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| // empty input |
| if _, err := km.Primitive([]byte{}); err == nil { |
| t.Errorf("expect an error when input is empty") |
| } |
| } |
| |
| func TestNewKeyCMACMultipleTimes(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain AES CMAC PRF key manager: %s", err) |
| } |
| serializedFormat, _ := proto.Marshal(testutil.NewAESCMACPRFKeyFormat()) |
| keys := make(map[string]bool) |
| nTest := 26 |
| for i := 0; i < nTest; i++ { |
| key, _ := km.NewKey(serializedFormat) |
| serializedKey, _ := proto.Marshal(key) |
| keys[string(serializedKey)] = true |
| |
| keyData, _ := km.NewKeyData(serializedFormat) |
| serializedKey = keyData.Value |
| keys[string(serializedKey)] = true |
| } |
| if len(keys) != nTest*2 { |
| t.Errorf("key is repeated") |
| } |
| } |
| |
| func TestNewKeyCMACBasic(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain AES CMAC PRF key manager: %s", err) |
| } |
| testFormats := genValidCMACKeyFormats() |
| for i := 0; i < len(testFormats); i++ { |
| serializedFormat, _ := proto.Marshal(testFormats[i]) |
| key, err := km.NewKey(serializedFormat) |
| if err != nil { |
| t.Errorf("unexpected error in test case %d: %s", i, err) |
| } |
| if err := validateCMACKey(testFormats[i], key.(*cmacpb.AesCmacPrfKey)); err != nil { |
| t.Errorf("%s", err) |
| } |
| } |
| } |
| |
| func TestNewKeyCMACWithInvalidInput(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain AES CMAC PRF key manager: %s", err) |
| } |
| // invalid key formats |
| testFormats := genInvalidCMACKeyFormats() |
| for i := 0; i < len(testFormats); i++ { |
| serializedFormat, err := proto.Marshal(testFormats[i]) |
| if err != nil { |
| fmt.Println("Error!") |
| } |
| if _, err := km.NewKey(serializedFormat); err == nil { |
| t.Errorf("expect an error in test case %d: %s", i, err) |
| } |
| } |
| if _, err := km.NewKey(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| // empty input |
| if _, err := km.NewKey([]byte{}); err == nil { |
| t.Errorf("expect an error when input is empty") |
| } |
| } |
| |
| func TestNewKeyDataCMACBasic(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain AES CMAC PRF key manager: %s", err) |
| } |
| testFormats := genValidCMACKeyFormats() |
| for i := 0; i < len(testFormats); i++ { |
| serializedFormat, _ := proto.Marshal(testFormats[i]) |
| keyData, err := km.NewKeyData(serializedFormat) |
| if err != nil { |
| t.Errorf("unexpected error in test case %d: %s", i, err) |
| } |
| if keyData.TypeUrl != testutil.AESCMACPRFTypeURL { |
| t.Errorf("incorrect type url in test case %d", i) |
| } |
| if keyData.KeyMaterialType != tinkpb.KeyData_SYMMETRIC { |
| t.Errorf("incorrect key material type in test case %d", i) |
| } |
| key := new(cmacpb.AesCmacPrfKey) |
| if err := proto.Unmarshal(keyData.Value, key); err != nil { |
| t.Errorf("invalid key value") |
| } |
| if err := validateCMACKey(testFormats[i], key); err != nil { |
| t.Errorf("invalid key") |
| } |
| } |
| } |
| |
| func TestNewKeyDataCMACWithInvalidInput(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("AES CMAC PRF key manager not found: %s", err) |
| } |
| // invalid key formats |
| testFormats := genInvalidCMACKeyFormats() |
| for i := 0; i < len(testFormats); i++ { |
| serializedFormat, _ := proto.Marshal(testFormats[i]) |
| 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") |
| } |
| } |
| |
| func TestCMACDoesSupport(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("AES CMAC PRF key manager not found: %s", err) |
| } |
| if !km.DoesSupport(testutil.AESCMACPRFTypeURL) { |
| t.Errorf("AESCMACPRFKeyManager must support %s", testutil.AESCMACPRFTypeURL) |
| } |
| if km.DoesSupport("some bad type") { |
| t.Errorf("AESCMACPRFKeyManager must support only %s", testutil.AESCMACPRFTypeURL) |
| } |
| } |
| |
| func TestCMACTypeURL(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.AESCMACPRFTypeURL) |
| if err != nil { |
| t.Errorf("AES CMAC PRF key manager not found: %s", err) |
| } |
| if km.TypeURL() != testutil.AESCMACPRFTypeURL { |
| t.Errorf("incorrect GetKeyType()") |
| } |
| } |
| |
| func genInvalidCMACKeys() []proto.Message { |
| badVersionKey := testutil.NewAESCMACPRFKey() |
| badVersionKey.Version++ |
| shortKey := testutil.NewAESCMACPRFKey() |
| shortKey.KeyValue = []byte{1, 1} |
| return []proto.Message{ |
| // not a AESCMACPRFKey |
| testutil.NewHMACParams(commonpb.HashType_SHA256, 32), |
| // bad version |
| badVersionKey, |
| // key too short |
| shortKey, |
| } |
| } |
| |
| func genInvalidCMACKeyFormats() []proto.Message { |
| shortKeyFormat := testutil.NewAESCMACPRFKeyFormat() |
| shortKeyFormat.KeySize = 1 |
| return []proto.Message{ |
| // not a AESCMACPRFKeyFormat |
| testutil.NewHMACParams(commonpb.HashType_SHA256, 32), |
| // key too short |
| shortKeyFormat, |
| } |
| } |
| |
| func genValidCMACKeyFormats() []*cmacpb.AesCmacPrfKeyFormat { |
| return []*cmacpb.AesCmacPrfKeyFormat{ |
| testutil.NewAESCMACPRFKeyFormat(), |
| } |
| } |
| |
| func genValidCMACKeys() []*cmacpb.AesCmacPrfKey { |
| return []*cmacpb.AesCmacPrfKey{ |
| testutil.NewAESCMACPRFKey(), |
| } |
| } |
| |
| // Checks whether the given CMACPRFKey matches the given key AESCMACPRFKeyFormat |
| func validateCMACKey(format *cmacpb.AesCmacPrfKeyFormat, key *cmacpb.AesCmacPrfKey) error { |
| if format.KeySize != uint32(len(key.KeyValue)) { |
| return fmt.Errorf("key format and generated key do not match") |
| } |
| p, err := subtle.NewAESCMACPRF(key.KeyValue) |
| if err != nil { |
| return fmt.Errorf("cannot create primitive from key: %s", err) |
| } |
| return validateCMACPrimitive(p, key) |
| } |
| |
| // validateCMACPrimitive checks whether the given primitive matches the given AESCMACPRFKey |
| func validateCMACPrimitive(p interface{}, key *cmacpb.AesCmacPrfKey) error { |
| cmacPrimitive := p.(prf.PRF) |
| prfPrimitive, err := subtle.NewAESCMACPRF(key.KeyValue) |
| if err != nil { |
| return fmt.Errorf("Could not create AES CMAC PRF with key material %q: %s", hex.EncodeToString(key.KeyValue), err) |
| } |
| data := random.GetRandomBytes(20) |
| res, err := cmacPrimitive.ComputePRF(data, 16) |
| if err != nil { |
| return fmt.Errorf("prf computation failed: %s", err) |
| } |
| if len(res) != 16 { |
| return fmt.Errorf("prf computation did not produce 16 byte output") |
| } |
| res2, err := prfPrimitive.ComputePRF(data, 16) |
| if err != nil { |
| return fmt.Errorf("prf computation failed: %s", err) |
| } |
| if len(res2) != 16 { |
| return fmt.Errorf("prf computation did not produce 16 byte output") |
| } |
| if hex.EncodeToString(res) != hex.EncodeToString(res2) { |
| return fmt.Errorf("prf computation did not produce the same output for the same key and input") |
| } |
| return nil |
| } |
