| // 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 hybrid |
| |
| import ( |
| "bytes" |
| "testing" |
| |
| "google.golang.org/protobuf/proto" |
| "github.com/google/tink/go/core/registry" |
| "github.com/google/tink/go/hybrid/internal/hpke" |
| "github.com/google/tink/go/subtle/random" |
| "github.com/google/tink/go/subtle" |
| hpkepb "github.com/google/tink/go/proto/hpke_go_proto" |
| ) |
| |
| var hpkeAEADs = []hpkepb.HpkeAead{ |
| hpkepb.HpkeAead_AES_128_GCM, |
| hpkepb.HpkeAead_AES_256_GCM, |
| hpkepb.HpkeAead_CHACHA20_POLY1305, |
| } |
| |
| func TestPublicKeyManagerPrimitiveRejectsInvalidKeyVersion(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| params := &hpkepb.HpkeParams{ |
| Kem: hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256, |
| Kdf: hpkepb.HpkeKdf_HKDF_SHA256, |
| Aead: hpkepb.HpkeAead_AES_256_GCM, |
| } |
| pubKey, _ := pubPrivKeys(t, params) |
| pubKey.Version = 1 |
| serializedPubKey, err := proto.Marshal(pubKey) |
| if err != nil { |
| t.Fatal(err) |
| } |
| if _, err := km.Primitive(serializedPubKey); err == nil { |
| t.Error("Primitive() err = nil, want error") |
| } |
| } |
| |
| func TestPublicKeyManagerPrimitiveRejectsInvalidParams(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| |
| tests := []struct { |
| name string |
| params *hpkepb.HpkeParams |
| }{ |
| {"kem", &hpkepb.HpkeParams{ |
| Kem: hpkepb.HpkeKem_KEM_UNKNOWN, |
| Kdf: hpkepb.HpkeKdf_HKDF_SHA256, |
| Aead: hpkepb.HpkeAead_AES_256_GCM, |
| }}, |
| {"kdf", &hpkepb.HpkeParams{ |
| Kem: hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256, |
| Kdf: hpkepb.HpkeKdf_KDF_UNKNOWN, |
| Aead: hpkepb.HpkeAead_AES_256_GCM, |
| }}, |
| {"aead", &hpkepb.HpkeParams{ |
| Kem: hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256, |
| Kdf: hpkepb.HpkeKdf_HKDF_SHA256, |
| Aead: hpkepb.HpkeAead_AEAD_UNKNOWN, |
| }}, |
| } |
| |
| for _, test := range tests { |
| t.Run(test.name, func(t *testing.T) { |
| serializedPubKey, _ := serializedPubPrivKeys(t, test.params) |
| if _, err := km.Primitive(serializedPubKey); err == nil { |
| t.Error("Primitive() err = nil, want error") |
| } |
| }) |
| } |
| } |
| |
| func TestPublicKeyManagerPrimitiveRejectsMissingParams(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| serializedPubKey, _ := serializedPubPrivKeys(t, nil) |
| if _, err := km.Primitive(serializedPubKey); err == nil { |
| t.Error("Primitive() err = nil, want error") |
| } |
| } |
| |
| func TestPublicKeyManagerPrimitiveRejectsNilKey(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| if _, err := km.Primitive(nil); err == nil { |
| t.Error("Primitive() err = nil, want error") |
| } |
| } |
| |
| func TestPublicKeyManagerPrimitiveEncryptDecrypt(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| |
| wantPT := random.GetRandomBytes(200) |
| ctxInfo := random.GetRandomBytes(100) |
| |
| for _, aeadID := range hpkeAEADs { |
| params := &hpkepb.HpkeParams{ |
| Kem: hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256, |
| Kdf: hpkepb.HpkeKdf_HKDF_SHA256, |
| Aead: aeadID, |
| } |
| pubKey, privKey := pubPrivKeys(t, params) |
| serializedPubKey, err := proto.Marshal(pubKey) |
| if err != nil { |
| t.Fatal(err) |
| } |
| |
| e, err := km.Primitive(serializedPubKey) |
| if err != nil { |
| t.Fatalf("Primitive() err = %v, want nil", err) |
| } |
| enc, ok := e.(*hpke.Encrypt) |
| if !ok { |
| t.Fatal("primitive is not Encrypt") |
| } |
| dec, err := hpke.NewDecrypt(privKey) |
| if err != nil { |
| t.Fatalf("hpke.NewDecrypt() err = %v, want nil", err) |
| } |
| |
| ct, err := enc.Encrypt(wantPT, ctxInfo) |
| if err != nil { |
| t.Fatalf("Encrypt() err = %v, want nil", err) |
| } |
| gotPT, err := dec.Decrypt(ct, ctxInfo) |
| if err != nil { |
| t.Fatalf("Decrypt() err = %v, want nil", err) |
| } |
| if !bytes.Equal(gotPT, wantPT) { |
| t.Errorf("Decrypt() = %x, want %x", gotPT, wantPT) |
| } |
| } |
| } |
| |
| func TestPublicKeyManagerDoesSupport(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| if !km.DoesSupport(hpkePublicKeyTypeURL) { |
| t.Errorf("DoesSupport(%q) = false, want true", hpkePublicKeyTypeURL) |
| } |
| unsupportedKeyTypeURL := "unsupported.key.type" |
| if km.DoesSupport(unsupportedKeyTypeURL) { |
| t.Errorf("DoesSupport(%q) = true, want false", unsupportedKeyTypeURL) |
| } |
| } |
| |
| func TestPublicKeyManagerTypeURL(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| if km.TypeURL() != hpkePublicKeyTypeURL { |
| t.Errorf("TypeURL = %q, want %q", km.TypeURL(), hpkePublicKeyTypeURL) |
| } |
| } |
| |
| func TestPublicKeyManagerNotSupported(t *testing.T) { |
| km, err := registry.GetKeyManager(hpkePublicKeyTypeURL) |
| if err != nil { |
| t.Fatalf("GetKeyManager(%q) err = %v, want nil", hpkePublicKeyTypeURL, err) |
| } |
| if _, err := km.NewKey(nil); err == nil { |
| t.Error("NewKey(nil) err = nil, want error") |
| } |
| if _, err := km.NewKeyData(nil); err == nil { |
| t.Error("NewKeyData(nil) err = nil, want error") |
| } |
| } |
| |
| func serializedPubPrivKeys(t *testing.T, params *hpkepb.HpkeParams) ([]byte, []byte) { |
| t.Helper() |
| pub, priv := pubPrivKeys(t, params) |
| serializedPub, err := proto.Marshal(pub) |
| if err != nil { |
| t.Fatal(err) |
| } |
| serializedPriv, err := proto.Marshal(priv) |
| if err != nil { |
| t.Fatal(err) |
| } |
| return serializedPub, serializedPriv |
| } |
| |
| func pubPrivKeys(t *testing.T, params *hpkepb.HpkeParams) (*hpkepb.HpkePublicKey, *hpkepb.HpkePrivateKey) { |
| t.Helper() |
| |
| priv, err := subtle.GeneratePrivateKeyX25519() |
| if err != nil { |
| t.Fatalf("GeneratePrivateKeyX25519: err %q", err) |
| } |
| pub, err := subtle.PublicFromPrivateX25519(priv) |
| if err != nil { |
| t.Fatalf("PublicFromPrivateX25519: err %q", err) |
| } |
| |
| pubKey := &hpkepb.HpkePublicKey{ |
| Version: 0, |
| Params: params, |
| PublicKey: pub, |
| } |
| privKey := &hpkepb.HpkePrivateKey{ |
| Version: 0, |
| PublicKey: pubKey, |
| PrivateKey: priv, |
| } |
| return pubKey, privKey |
| } |