| // 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_test |
| |
| import ( |
| "bytes" |
| "testing" |
| |
| "google.golang.org/protobuf/proto" |
| "github.com/google/tink/go/hybrid" |
| "github.com/google/tink/go/insecurecleartextkeyset" |
| "github.com/google/tink/go/keyset" |
| "github.com/google/tink/go/subtle/random" |
| testutilhybrid "github.com/google/tink/go/testutil/hybrid" |
| hpkepb "github.com/google/tink/go/proto/hpke_go_proto" |
| tinkpb "github.com/google/tink/go/proto/tink_go_proto" |
| ) |
| |
| func TestKeysetHandleFromSerializedPrivateKey(t *testing.T) { |
| // Obtain private and public key handles via key template. |
| keyTemplate := hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Raw_Key_Template() |
| privHandle, err := keyset.NewHandle(keyTemplate) |
| if err != nil { |
| t.Fatalf("NewHandle(%v) err = %v, want nil", keyTemplate, err) |
| } |
| pubHandle, err := privHandle.Public() |
| if err != nil { |
| t.Fatalf("Public() err = %v, want nil", err) |
| } |
| |
| // Get private, public key bytes and construct a private key handle. |
| privKeyBytes, pubKeyBytes := privPubKeyBytes(t, privHandle) |
| gotprivHandle, err := testutilhybrid.KeysetHandleFromSerializedPrivateKey(privKeyBytes, pubKeyBytes, keyTemplate) |
| if err != nil { |
| t.Errorf("KeysetHandleFromSerializedPrivateKey(%v, %v, %v) err = %v, want nil", privKeyBytes, pubKeyBytes, keyTemplate, err) |
| } |
| |
| plaintext := random.GetRandomBytes(200) |
| ctxInfo := random.GetRandomBytes(100) |
| |
| // Encrypt with original public key handle. |
| enc, err := hybrid.NewHybridEncrypt(pubHandle) |
| if err != nil { |
| t.Fatalf("NewHybridEncrypt(%v) err = %v, want nil", pubHandle, err) |
| } |
| ciphertext, err := enc.Encrypt(plaintext, ctxInfo) |
| if err != nil { |
| t.Fatalf("Encrypt(%x, %x) err = %v, want nil", plaintext, ctxInfo, err) |
| } |
| |
| // Decrypt with private key handle constructed from key bytes. |
| dec, err := hybrid.NewHybridDecrypt(gotprivHandle) |
| if err != nil { |
| t.Fatalf("NewHybridDecrypt(%v) err = %v, want nil", gotprivHandle, err) |
| } |
| gotPlaintext, err := dec.Decrypt(ciphertext, ctxInfo) |
| if err != nil { |
| t.Fatalf("Decrypt(%x, %x) err = %v, want nil", ciphertext, ctxInfo, err) |
| } |
| if !bytes.Equal(gotPlaintext, plaintext) { |
| t.Errorf("Decrypt(%x, %x) = %x, want %x", ciphertext, ctxInfo, gotPlaintext, plaintext) |
| } |
| } |
| |
| func TestKeysetHandleFromSerializedPrivateKeyInvalidTemplateFails(t *testing.T) { |
| keyTemplate := hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Raw_Key_Template() |
| privHandle, err := keyset.NewHandle(keyTemplate) |
| if err != nil { |
| t.Fatalf("NewHandle(%v) err = %v, want nil", keyTemplate, err) |
| } |
| privKeyBytes, pubKeyBytes := privPubKeyBytes(t, privHandle) |
| |
| tests := []struct { |
| name string |
| template *tinkpb.KeyTemplate |
| }{ |
| {"AES_128_GCM", hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Key_Template()}, |
| {"AES_128_GCM_Raw", hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Raw_Key_Template()}, |
| {"AES_256_GCM", hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Key_Template()}, |
| {"AES_256_GCM_Raw", hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Raw_Key_Template()}, |
| {"CHACHA20_POLY1305", hybrid.DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Key_Template()}, |
| {"invalid type URL", &tinkpb.KeyTemplate{ |
| TypeUrl: "type.googleapis.com/google.crypto.tink.EciesAeadHkdfPrivateKey", |
| Value: keyTemplate.GetValue(), |
| OutputPrefixType: tinkpb.OutputPrefixType_RAW, |
| }}, |
| } |
| for _, test := range tests { |
| t.Run(test.name, func(t *testing.T) { |
| if _, err := testutilhybrid.KeysetHandleFromSerializedPrivateKey(privKeyBytes, pubKeyBytes, test.template); err == nil { |
| t.Errorf("KeysetHandleFromSerializedPrivateKey(%v, %v, %v) err = nil, want error", privKeyBytes, pubKeyBytes, test.template) |
| } |
| }) |
| } |
| } |
| |
| func privPubKeyBytes(t *testing.T, handle *keyset.Handle) ([]byte, []byte) { |
| t.Helper() |
| |
| // Write Handle to MemReaderWriter. |
| got := &keyset.MemReaderWriter{} |
| if err := insecurecleartextkeyset.Write(handle, got); err != nil { |
| t.Fatalf("Write(%v) err = %v, want nil", handle, err) |
| } |
| if len(got.Keyset.GetKey()) != 1 { |
| t.Fatalf("len(gotPriv.Keyset) = %d", len(got.Keyset.GetKey())) |
| } |
| |
| // Extract HpkePrivateKey from MemReaderWriter. |
| serializedPrivKey := got.Keyset.GetKey()[0].GetKeyData().GetValue() |
| privKey := &hpkepb.HpkePrivateKey{} |
| if err := proto.Unmarshal(serializedPrivKey, privKey); err != nil { |
| t.Fatalf("Unmarshal(%v) = err %v, want nil", serializedPrivKey, err) |
| } |
| |
| return privKey.GetPrivateKey(), privKey.GetPublicKey().GetPublicKey() |
| } |