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// 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/tink-crypto/tink-go/v2/hybrid"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/subtle/random"
"github.com/tink-crypto/tink-go/v2/testkeyset"
testutilhybrid "github.com/tink-crypto/tink-go/v2/testutil/hybrid"
hpkepb "github.com/tink-crypto/tink-go/v2/proto/hpke_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/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()
ks := testkeyset.KeysetMaterial(handle)
if len(ks.GetKey()) != 1 {
t.Fatalf("got len(ks.GetKey()) = %d, want 1", len(ks.GetKey()))
}
serializedPrivKey := ks.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()
}
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