| // Copyright 2021 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" |
| "encoding/hex" |
| "testing" |
| |
| "github.com/google/tink/go/aead" |
| "github.com/google/tink/go/daead" |
| "github.com/google/tink/go/mac" |
| "github.com/google/tink/go/signature" |
| "github.com/google/tink/go/subtle/random" |
| "github.com/google/tink/go/tink" |
| tinkpb "github.com/google/tink/go/proto/tink_go_proto" |
| ) |
| |
| var ( |
| keyTemplates = map[*tinkpb.KeyTemplate]uint32{ |
| aead.AES256CTRHMACSHA256KeyTemplate(): 64, |
| aead.AES128CTRHMACSHA256KeyTemplate(): 48, |
| aead.AES256GCMKeyTemplate(): 32, |
| aead.AES128GCMKeyTemplate(): 16, |
| daead.AESSIVKeyTemplate(): 64, |
| } |
| uTemplates = []*tinkpb.KeyTemplate{ |
| signature.ECDSAP256KeyTemplate(), |
| mac.HMACSHA256Tag256KeyTemplate(), |
| &tinkpb.KeyTemplate{TypeUrl: "some url", Value: []byte{0}}, |
| &tinkpb.KeyTemplate{TypeUrl: aesCTRHMACAEADTypeURL}, |
| &tinkpb.KeyTemplate{TypeUrl: aesGCMTypeURL}, |
| &tinkpb.KeyTemplate{TypeUrl: aesSIVTypeURL}, |
| } |
| ) |
| |
| func TestCipherKeySize(t *testing.T) { |
| for c, l := range keyTemplates { |
| rDem, err := newRegisterECIESAEADHKDFDemHelper(c) |
| if err != nil { |
| t.Fatalf("error generating a DEM helper :%s", err) |
| } |
| if rDem.GetSymmetricKeySize() != l { |
| t.Errorf("incorrect key size %s template, got: %d, want: %d", c, rDem.GetSymmetricKeySize(), l) |
| } |
| } |
| } |
| |
| func TestUnsupportedKeyTemplates(t *testing.T) { |
| for _, l := range uTemplates { |
| _, err := newRegisterECIESAEADHKDFDemHelper(l) |
| if err == nil { |
| t.Fatalf("unsupported key template %s should have generated error", l) |
| } |
| } |
| } |
| |
| func TestAead(t *testing.T) { |
| for c := range keyTemplates { |
| pt := random.GetRandomBytes(20) |
| ad := random.GetRandomBytes(20) |
| rDem, err := newRegisterECIESAEADHKDFDemHelper(c) |
| if err != nil { |
| t.Fatalf("error generating a DEM helper :%s", err) |
| } |
| sk := random.GetRandomBytes(rDem.GetSymmetricKeySize()) |
| prim, err := rDem.GetAEADOrDAEAD(sk) |
| if err != nil { |
| t.Errorf("error getting AEAD primitive :%s", err) |
| } |
| var ct []byte |
| switch a := prim.(type) { |
| case tink.AEAD: |
| ct, err = a.Encrypt(pt, ad) |
| case tink.DeterministicAEAD: |
| ct, err = a.EncryptDeterministically(pt, ad) |
| } |
| if err != nil { |
| t.Errorf("error encrypting :%s", err) |
| } |
| |
| var dt []byte |
| switch a := prim.(type) { |
| case tink.AEAD: |
| dt, err = a.Decrypt(ct, ad) |
| case tink.DeterministicAEAD: |
| dt, err = a.DecryptDeterministically(ct, ad) |
| } |
| if err != nil { |
| t.Errorf("error decrypting :%s", err) |
| } |
| if !bytes.Equal(dt, pt) { |
| t.Errorf("decryption not inverse of encryption,\n want :%s,\n got: %s", hex.Dump(pt), hex.Dump(dt)) |
| } |
| |
| // shorter symmetric key |
| sk = random.GetRandomBytes(rDem.GetSymmetricKeySize() - 1) |
| if _, err = rDem.GetAEADOrDAEAD(sk); err == nil { |
| t.Errorf("retrieving AEAD primitive should have failed") |
| } |
| |
| // longer symmetric key |
| sk = random.GetRandomBytes(rDem.GetSymmetricKeySize() + 1) |
| if _, err = rDem.GetAEADOrDAEAD(sk); err == nil { |
| t.Errorf("retrieving AEAD primitive should have failed") |
| } |
| |
| } |
| } |