| // Copyright 2018 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 signature_test |
| |
| import ( |
| "bytes" |
| "crypto/ed25519" |
| "encoding/hex" |
| "fmt" |
| "testing" |
| |
| "github.com/google/go-cmp/cmp" |
| "google.golang.org/protobuf/proto" |
| "github.com/google/tink/go/core/registry" |
| "github.com/google/tink/go/internal/internalregistry" |
| "github.com/google/tink/go/signature/subtle" |
| "github.com/google/tink/go/subtle/random" |
| "github.com/google/tink/go/testutil" |
| ed25519pb "github.com/google/tink/go/proto/ed25519_go_proto" |
| tinkpb "github.com/google/tink/go/proto/tink_go_proto" |
| ) |
| |
| func TestED25519SignerGetPrimitiveBasic(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain ED25519Signer key manager: %s", err) |
| } |
| pvtKey := testutil.NewED25519PrivateKey() |
| serializedKey, _ := proto.Marshal(pvtKey) |
| tmp, err := km.Primitive(serializedKey) |
| if err != nil { |
| t.Errorf("unexpect error in test case: %s ", err) |
| } |
| var s = tmp.(*subtle.ED25519Signer) |
| |
| kmPub, err := registry.GetKeyManager(testutil.ED25519VerifierTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain ED25519Signer key manager: %s", err) |
| } |
| pubKey := pvtKey.PublicKey |
| serializedKey, _ = proto.Marshal(pubKey) |
| tmp, err = kmPub.Primitive(serializedKey) |
| if err != nil { |
| t.Errorf("unexpect error in test case: %s ", err) |
| } |
| var v = tmp.(*subtle.ED25519Verifier) |
| |
| data := random.GetRandomBytes(1281) |
| signature, err := s.Sign(data) |
| if err != nil { |
| t.Errorf("unexpected error when signing: %s", err) |
| } |
| |
| if err := v.Verify(signature, data); err != nil { |
| t.Errorf("unexpected error when verifying signature: %s", err) |
| } |
| |
| } |
| |
| func TestED25519SignGetPrimitiveWithInvalidInput(t *testing.T) { |
| // invalid params |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain ED25519Signer key manager: %s", err) |
| } |
| |
| // invalid version |
| key := testutil.NewED25519PrivateKey() |
| key.Version = testutil.ED25519SignerKeyVersion + 1 |
| serializedKey, _ := proto.Marshal(key) |
| if _, err := km.Primitive(serializedKey); err == nil { |
| t.Errorf("expect an error when version is invalid") |
| } |
| // nil input |
| if _, err := km.Primitive(nil); err == nil { |
| t.Errorf("expect an error when input is nil") |
| } |
| if _, err := km.Primitive([]byte{}); err == nil { |
| t.Errorf("expect an error when input is empty slice") |
| } |
| } |
| |
| func TestED25519SignNewKeyBasic(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain ED25519Signer key manager: %s", err) |
| } |
| serializedFormat, _ := proto.Marshal(testutil.NewED25519PrivateKey()) |
| tmp, err := km.NewKey(serializedFormat) |
| if err != nil { |
| t.Errorf("unexpected error: %s", err) |
| } |
| key := tmp.(*ed25519pb.Ed25519PrivateKey) |
| if err := validateED25519PrivateKey(key); err != nil { |
| t.Errorf("invalid private key in test case: %s", err) |
| } |
| } |
| |
| func TestED25519PublicKeyDataBasic(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain ED25519Signer key manager: %s", err) |
| } |
| pkm, ok := km.(registry.PrivateKeyManager) |
| if !ok { |
| t.Errorf("cannot obtain private key manager") |
| } |
| |
| key := testutil.NewED25519PrivateKey() |
| serializedKey, _ := proto.Marshal(key) |
| |
| pubKeyData, err := pkm.PublicKeyData(serializedKey) |
| if err != nil { |
| t.Errorf("unexpect error in test case: %s ", err) |
| } |
| if pubKeyData.TypeUrl != testutil.ED25519VerifierTypeURL { |
| t.Errorf("incorrect type url: %s", pubKeyData.TypeUrl) |
| } |
| if pubKeyData.KeyMaterialType != tinkpb.KeyData_ASYMMETRIC_PUBLIC { |
| t.Errorf("incorrect key material type: %d", pubKeyData.KeyMaterialType) |
| } |
| pubKey := new(ed25519pb.Ed25519PublicKey) |
| if err = proto.Unmarshal(pubKeyData.Value, pubKey); err != nil { |
| t.Errorf("invalid public key: %s", err) |
| } |
| } |
| |
| func TestED25519PublicKeyDataWithInvalidInput(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Errorf("cannot obtain ED25519Signer key manager: %s", err) |
| } |
| pkm, ok := km.(registry.PrivateKeyManager) |
| if !ok { |
| t.Errorf("cannot obtain private key manager") |
| } |
| // modified key |
| key := testutil.NewED25519PrivateKey() |
| serializedKey, _ := proto.Marshal(key) |
| serializedKey[0] = 0 |
| if _, err := pkm.PublicKeyData(serializedKey); err == nil { |
| t.Errorf("expect an error when input is a modified serialized key") |
| } |
| // invalid with a single byte |
| if _, err := pkm.PublicKeyData([]byte{42}); err == nil { |
| t.Errorf("expect an error when input is an empty slice") |
| } |
| } |
| |
| func TestED25519KeyMaterialType(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Fatalf("registry.GetKeyManager(%q) err = %v, want nil", testutil.ED25519SignerTypeURL, err) |
| } |
| keyManager, ok := km.(internalregistry.DerivableKeyManager) |
| if !ok { |
| t.Fatalf("key manager is not DerivableKeyManager") |
| } |
| if got, want := keyManager.KeyMaterialType(), tinkpb.KeyData_ASYMMETRIC_PRIVATE; got != want { |
| t.Errorf("KeyMaterialType() = %v, want %v", got, want) |
| } |
| } |
| |
| func TestED25519DeriveKey(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Fatalf("registry.GetKeyManager(%q) err = %v, want nil", testutil.ED25519SignerTypeURL, err) |
| } |
| keyManager, ok := km.(internalregistry.DerivableKeyManager) |
| if !ok { |
| t.Fatalf("key manager is not DerivableKeyManager") |
| } |
| keyFormat, err := proto.Marshal(&ed25519pb.Ed25519KeyFormat{Version: testutil.ED25519SignerKeyVersion}) |
| if err != nil { |
| t.Fatalf("proto.Marshal() err = %v, want nil", err) |
| } |
| for _, test := range []struct { |
| name string |
| keyFormat []byte |
| }{ |
| { |
| // nil unmarshals to an empty proto, which implies version = 0. |
| name: "nil", |
| keyFormat: nil, |
| }, |
| { |
| // An empty proto implies version = 0. |
| name: "empty", |
| keyFormat: []byte{}, |
| }, |
| { |
| name: "specified", |
| keyFormat: keyFormat, |
| }, |
| } { |
| t.Run(test.name, func(t *testing.T) { |
| rand := random.GetRandomBytes(ed25519.SeedSize) |
| buf := &bytes.Buffer{} |
| buf.Write(rand) // never returns a non-nil error |
| k, err := keyManager.DeriveKey(test.keyFormat, buf) |
| if err != nil { |
| t.Fatalf("keyManager.DeriveKey() err = %v, want nil", err) |
| } |
| key := k.(*ed25519pb.Ed25519PrivateKey) |
| if got, want := len(key.KeyValue), ed25519.SeedSize; got != want { |
| t.Errorf("private key length = %d, want %d", got, want) |
| } |
| if diff := cmp.Diff(key.KeyValue, rand[:ed25519.SeedSize]); diff != "" { |
| t.Errorf("incorrect derived private key: diff = %v", diff) |
| } |
| if got, want := len(key.PublicKey.KeyValue), ed25519.PublicKeySize; got != want { |
| t.Errorf("public key length = %d, want %d", got, want) |
| } |
| if diff := cmp.Diff(key.PublicKey.KeyValue, []byte(ed25519.NewKeyFromSeed(rand))[32:]); diff != "" { |
| t.Errorf("incorrect derived public key: diff = %v", diff) |
| } |
| }) |
| } |
| } |
| |
| func TestED25519DeriveKeyFailsWithInvalidKeyFormats(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Fatalf("registry.GetKeyManager(%q) err = %v, want nil", testutil.ED25519SignerTypeURL, err) |
| } |
| keyManager, ok := km.(internalregistry.DerivableKeyManager) |
| if !ok { |
| t.Fatalf("key manager is not DerivableKeyManager") |
| } |
| invalidVersion, err := proto.Marshal(&ed25519pb.Ed25519KeyFormat{Version: 10}) |
| if err != nil { |
| t.Fatalf("proto.Marshal() err = %v, want nil", err) |
| } |
| // Proto messages start with a VarInt, which always ends with a byte with the |
| // MSB unset, so 0x80 is invalid. |
| invalidSerialization, err := hex.DecodeString("80") |
| if err != nil { |
| t.Errorf("hex.DecodeString() err = %v, want nil", err) |
| } |
| for _, test := range []struct { |
| name string |
| keyFormat []byte |
| }{ |
| { |
| name: "invalid version", |
| keyFormat: invalidVersion, |
| }, |
| { |
| name: "invalid serialization", |
| keyFormat: invalidSerialization, |
| }, |
| } { |
| t.Run(test.name, func(t *testing.T) { |
| buf := bytes.NewBuffer(random.GetRandomBytes(ed25519.SeedSize)) |
| if _, err := keyManager.DeriveKey(test.keyFormat, buf); err == nil { |
| t.Errorf("keyManager.DeriveKey() err = nil, want non-nil") |
| } |
| }) |
| } |
| } |
| |
| func TestED25519DeriveKeyFailsWithInsufficientRandomness(t *testing.T) { |
| km, err := registry.GetKeyManager(testutil.ED25519SignerTypeURL) |
| if err != nil { |
| t.Fatalf("registry.GetKeyManager(%q) err = %v, want nil", testutil.ED25519SignerTypeURL, err) |
| } |
| keyManager, ok := km.(internalregistry.DerivableKeyManager) |
| if !ok { |
| t.Fatalf("key manager is not DerivableKeyManager") |
| } |
| keyFormat, err := proto.Marshal(&ed25519pb.Ed25519KeyFormat{Version: 0}) |
| if err != nil { |
| t.Fatalf("proto.Marshal() err = %v, want nil", err) |
| } |
| { |
| buf := bytes.NewBuffer(random.GetRandomBytes(ed25519.SeedSize)) |
| if _, err := keyManager.DeriveKey(keyFormat, buf); err != nil { |
| t.Errorf("keyManager.DeriveKey() err = %v, want nil", err) |
| } |
| } |
| { |
| insufficientBuf := bytes.NewBuffer(random.GetRandomBytes(ed25519.SeedSize - 1)) |
| if _, err := keyManager.DeriveKey(keyFormat, insufficientBuf); err == nil { |
| t.Errorf("keyManager.DeriveKey() err = nil, want non-nil") |
| } |
| } |
| } |
| |
| func validateED25519PrivateKey(key *ed25519pb.Ed25519PrivateKey) error { |
| if key.Version != testutil.ED25519SignerKeyVersion { |
| return fmt.Errorf("incorrect private key's version: expect %d, got %d", |
| testutil.ED25519SignerKeyVersion, key.Version) |
| } |
| publicKey := key.PublicKey |
| if publicKey.Version != testutil.ED25519SignerKeyVersion { |
| return fmt.Errorf("incorrect public key's version: expect %d, got %d", |
| testutil.ED25519SignerKeyVersion, key.Version) |
| } |
| |
| signer, err := subtle.NewED25519Signer(key.KeyValue) |
| if err != nil { |
| return fmt.Errorf("unexpected error when creating ED25519Sign: %s", err) |
| } |
| |
| verifier, err := subtle.NewED25519Verifier(publicKey.KeyValue) |
| if err != nil { |
| return fmt.Errorf("unexpected error when creating ED25519Verify: %s", err) |
| } |
| for i := 0; i < 100; i++ { |
| data := random.GetRandomBytes(1281) |
| signature, err := signer.Sign(data) |
| if err != nil { |
| return fmt.Errorf("unexpected error when signing: %s", err) |
| } |
| |
| if err := verifier.Verify(signature, data); err != nil { |
| return fmt.Errorf("unexpected error when verifying signature: %s", err) |
| } |
| } |
| return nil |
| } |
