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// Copyright 2019 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 (
"bytes"
"testing"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/daead"
"github.com/tink-crypto/tink-go/v2/hybrid/internal/ecies"
"github.com/tink-crypto/tink-go/v2/hybrid/subtle"
"github.com/tink-crypto/tink-go/v2/subtle/random"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
func basicMultipleEncrypts(t *testing.T, c string, k *tinkpb.KeyTemplate) {
t.Helper()
curve, err := subtle.GetCurve(c)
if err != nil {
t.Fatalf("error getting %s curve: %s ", c, err)
}
pvt, err := subtle.GenerateECDHKeyPair(curve)
if err != nil {
t.Fatalf("error generating ECDH key pair: %s", err)
}
salt := []byte("some salt")
pt := random.GetRandomBytes(20)
context := []byte("context info")
rDem, err := ecies.NewDEMHelper(k)
if err != nil {
t.Fatalf("error generating a DEM helper :%s", err)
}
e, err := subtle.NewECIESAEADHKDFHybridEncrypt(&pvt.PublicKey, salt, "SHA256", "UNCOMPRESSED", rDem)
if err != nil {
t.Fatalf("error generating an encryption construct :%s", err)
}
d, err := subtle.NewECIESAEADHKDFHybridDecrypt(pvt, salt, "SHA256", "UNCOMPRESSED", rDem)
if err != nil {
t.Fatalf("error generating an decryption construct :%s", err)
}
cl := [][]byte{}
for i := 0; i < 8; i++ {
ct, err := e.Encrypt(pt, context)
if err != nil {
t.Fatalf("encryption error :%s", err)
}
for _, c := range cl {
if bytes.Equal(ct, c) {
t.Fatalf("encryption is not randomized")
}
}
cl = append(cl, ct)
dt, err := d.Decrypt(ct, context)
if err != nil {
t.Fatalf("decryption error :%s", err)
}
if !bytes.Equal(dt, pt) {
t.Fatalf("decryption not inverse of encryption")
}
}
if len(cl) != 8 {
t.Errorf("randomized encryption check failed")
}
}
func TestECAESCTRHMACSHA256Encrypt(t *testing.T) {
basicMultipleEncrypts(t, "NIST_P256", aead.AES256CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P384", aead.AES256CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P521", aead.AES256CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P224", aead.AES256CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P256", aead.AES128CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P384", aead.AES128CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P521", aead.AES128CTRHMACSHA256KeyTemplate())
basicMultipleEncrypts(t, "NIST_P224", aead.AES128CTRHMACSHA256KeyTemplate())
}
func TestECAES256GCMEncrypt(t *testing.T) {
basicMultipleEncrypts(t, "NIST_P256", aead.AES256GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P384", aead.AES256GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P521", aead.AES256GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P224", aead.AES256GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P256", aead.AES128GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P384", aead.AES128GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P521", aead.AES128GCMKeyTemplate())
basicMultipleEncrypts(t, "NIST_P224", aead.AES128GCMKeyTemplate())
}
func TestECAESSIVEncrypt(t *testing.T) {
basicMultipleEncrypts(t, "NIST_P256", daead.AESSIVKeyTemplate())
basicMultipleEncrypts(t, "NIST_P384", daead.AESSIVKeyTemplate())
basicMultipleEncrypts(t, "NIST_P521", daead.AESSIVKeyTemplate())
basicMultipleEncrypts(t, "NIST_P224", daead.AESSIVKeyTemplate())
}
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