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// Copyright 2025 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 ecies_test
import (
"testing"
"github.com/google/go-cmp/cmp"
"github.com/tink-crypto/tink-go/v2/aead/aesgcm"
"github.com/tink-crypto/tink-go/v2/hybrid/ecies"
"github.com/tink-crypto/tink-go/v2/hybrid"
"github.com/tink-crypto/tink-go/v2/keyset"
)
func mustCreateKeysetHandle(t *testing.T, privateKey *ecies.PrivateKey) *keyset.Handle {
t.Helper()
km := keyset.NewManager()
keyID, err := km.AddKey(privateKey)
if err != nil {
t.Fatalf("km.Add() err = %v, want nil", err)
}
if err := km.SetPrimary(keyID); err != nil {
t.Fatalf("km.SetPrimary() err = %v, want nil", err)
}
handle, err := km.Handle()
if err != nil {
t.Fatalf("km.Handle() err = %v, want nil", err)
}
return handle
}
func TestEncryptDecryptFromPublicAPI(t *testing.T) {
for _, tc := range hybridTestVectors(t) {
t.Run(tc.name, func(t *testing.T) {
privateKeyHandle := mustCreateKeysetHandle(t, tc.privateKey)
publicKeyHandle, err := privateKeyHandle.Public()
if err != nil {
t.Fatalf("privateKeyHandle.Public() err = %v, want nil", err)
}
encrypter, err := hybrid.NewHybridEncrypt(publicKeyHandle)
if err != nil {
t.Fatalf("hybrid.NewHybridEncrypt() err = %v, want nil", err)
}
decrypter, err := hybrid.NewHybridDecrypt(privateKeyHandle)
if err != nil {
t.Fatalf("hybrid.NewHybridDecrypt() err = %v, want nil", err)
}
// Decrypt the ciphertext generated by the encrypter.
{
gotCiphertext, err := encrypter.Encrypt(tc.plaintext, tc.contextInfo)
if err != nil {
t.Fatalf("encrypter.Encrypt() err = %v, want nil", err)
}
gotDecrypted, err := decrypter.Decrypt(gotCiphertext, tc.contextInfo)
if err != nil {
t.Fatalf("decrypter.Decrypt() err = %v, want nil", err)
}
if diff := cmp.Diff(gotDecrypted, tc.plaintext); diff != "" {
t.Errorf("decrypter.Decrypt() returned unexpected diff (-want +got):\n%s", diff)
}
}
// Decrypt the test case ciphertext.
{
gotDecrypted, err := decrypter.Decrypt(tc.ciphertext, tc.contextInfo)
if err != nil {
t.Fatalf("decrypter.Decrypt() err = %v, want nil", err)
}
if diff := cmp.Diff(gotDecrypted, tc.plaintext); diff != "" {
t.Errorf("decrypter.Decrypt() returned unexpected diff (-want +got):\n%s", diff)
}
}
})
}
}
func TestEncryptDecryptFromWithKeysetFromParameters(t *testing.T) {
demParameters, err := aesgcm.NewParameters(aesgcm.ParametersOpts{
KeySizeInBytes: 32,
IVSizeInBytes: 12,
TagSizeInBytes: 16,
Variant: aesgcm.VariantNoPrefix,
})
if err != nil {
t.Fatalf("aesgcm.NewParameters() err = %v, want nil", err)
}
params, err := ecies.NewParameters(ecies.ParametersOpts{
CurveType: ecies.NISTP256,
HashType: ecies.SHA256,
Variant: ecies.VariantTink,
NISTCurvePointFormat: ecies.CompressedPointFormat,
DEMParameters: demParameters,
Salt: []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10},
})
if err != nil {
t.Fatalf("ecies.NewParameters() err = %v, want nil", err)
}
km := keyset.NewManager()
keyID, err := km.AddNewKeyFromParameters(params)
if err != nil {
t.Fatalf("km.AddNewKeyFromParameters() err = %v, want nil", err)
}
if err := km.SetPrimary(keyID); err != nil {
t.Fatalf("km.SetPrimary() err = %v, want nil", err)
}
privateKeyHandle, err := km.Handle()
if err != nil {
t.Fatalf("km.Handle() err = %v, want nil", err)
}
publicKeyHandle, err := privateKeyHandle.Public()
if err != nil {
t.Fatalf("privateKeyHandle.Public() err = %v, want nil", err)
}
encrypter, err := hybrid.NewHybridEncrypt(publicKeyHandle)
if err != nil {
t.Fatalf("hybrid.NewHybridEncrypt() err = %v, want nil", err)
}
decrypter, err := hybrid.NewHybridDecrypt(privateKeyHandle)
if err != nil {
t.Fatalf("hybrid.NewHybridDecrypt() err = %v, want nil", err)
}
plaintext := []byte("plaintext")
contextInfo := []byte("contextInfo")
ciphertext, err := encrypter.Encrypt(plaintext, contextInfo)
if err != nil {
t.Fatalf("encrypter.Encrypt() err = %v, want nil", err)
}
gotDecrypted, err := decrypter.Decrypt(ciphertext, contextInfo)
if err != nil {
t.Fatalf("decrypter.Decrypt() err = %v, want nil", err)
}
if diff := cmp.Diff(gotDecrypted, plaintext); diff != "" {
t.Errorf("decrypter.Decrypt() returned unexpected diff (-want +got):\n%s", diff)
}
}
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