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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 aessiv_test
import (
"bytes"
"encoding/hex"
"slices"
"testing"
"github.com/tink-crypto/tink-go/v2/daead/aessiv"
"github.com/tink-crypto/tink-go/v2/internal/internalapi"
"github.com/tink-crypto/tink-go/v2/internal/outputprefix"
"github.com/tink-crypto/tink-go/v2/secretdata"
"github.com/tink-crypto/tink-go/v2/testing/insecuresecretdataaccesstest"
)
func mustHexDecode(t *testing.T, s string) []byte {
t.Helper()
b, err := hex.DecodeString(s)
if err != nil {
t.Fatalf("hex.DecodeString(%q) failed: %v", s, err)
}
return b
}
func mustCreateParameters(t *testing.T, keySize int, variant aessiv.Variant) *aessiv.Parameters {
t.Helper()
p, err := aessiv.NewParameters(keySize, variant)
if err != nil {
t.Fatalf("aessiv.NewParameters(%v, %v) failed: %v", keySize, variant, err)
}
return p
}
func mustCreateKey(t *testing.T, keyBytes []byte, idRequirement uint32, parameters *aessiv.Parameters) *aessiv.Key {
t.Helper()
p, err := aessiv.NewKey(secretdata.NewBytesFromData(keyBytes, insecuresecretdataaccesstest.Token()), idRequirement, parameters)
if err != nil {
t.Fatalf("aessiv.NewKey(%x, %v) failed: %v", keyBytes, parameters, err)
}
return p
}
func TestDeterministicAEAD(t *testing.T) {
// Test case from
// https://github.com/C2SP/wycheproof/blob/cd27d6419bedd83cbd24611ec54b6d4bfdb0cdca/testvectors/aes_siv_cmac_test.json#L2865.
keyBytes := mustHexDecode(t, "c25cafc6018b98dfbb79a40ec89c575a4f88c4116489bba27707479800c0130235334a45dbe8d8dae3da8dcb45bbe5dce031b0f68ded544fda7eca30d6749442")
ad := mustHexDecode(t, "deeb0ccf3aef47a296ed1ca8f4ae5907")
plaintext := mustHexDecode(t, "beec61030fa3d670337196beade6aeaa")
ciphertext := mustHexDecode(t, "5865208eab9163db85cab9f96d846234a2626aae22f5c17c9aad4b501f4416e4")
for _, tc := range []struct {
name string
key *aessiv.Key
wantCiphertext []byte
}{
{
name: "No prefix",
key: mustCreateKey(t, keyBytes, 0, mustCreateParameters(t, len(keyBytes), aessiv.VariantNoPrefix)),
wantCiphertext: ciphertext,
},
{
name: "Tink prefix",
key: mustCreateKey(t, keyBytes, 0x01020304, mustCreateParameters(t, len(keyBytes), aessiv.VariantTink)),
wantCiphertext: slices.Concat(outputprefix.Tink(0x01020304), ciphertext),
},
{
name: "Crunchy prefix",
key: mustCreateKey(t, keyBytes, 0x01020304, mustCreateParameters(t, len(keyBytes), aessiv.VariantCrunchy)),
wantCiphertext: slices.Concat(outputprefix.Legacy(0x01020304), ciphertext),
},
} {
t.Run(tc.name, func(t *testing.T) {
daead, err := aessiv.NewDeterministicAEAD(tc.key, internalapi.Token{})
if err != nil {
t.Fatalf("aessiv.NewDeterministicAEAD(%v) failed: %v", tc.key, err)
}
ciphertext, err := daead.EncryptDeterministically(plaintext, ad)
if err != nil {
t.Fatalf("daead.EncryptDeterministically(%v, %v) failed: %v", plaintext, ad, err)
}
if got, want := ciphertext, tc.wantCiphertext; !bytes.Equal(got, want) {
t.Errorf("daead.EncryptDeterministically(%v, %v) = %x, want %x", plaintext, ad, got, want)
}
decrypted, err := daead.DecryptDeterministically(ciphertext, ad)
if err != nil {
t.Fatalf("daead.DecryptDeterministically(%v, %v) failed: %v", ciphertext, ad, err)
}
if got, want := decrypted, plaintext; !bytes.Equal(got, want) {
t.Errorf("daead.DecryptDeterministically(%v, %v) = %v, want %v", ciphertext, ad, got, want)
}
})
}
}
func TestDeterministicAEADDecryptFailsWithInvalidCiphertext(t *testing.T) {
// Test case from
// https://github.com/C2SP/wycheproof/blob/cd27d6419bedd83cbd24611ec54b6d4bfdb0cdca/testvectors/aes_siv_cmac_test.json#L2865.
keyBytes := mustHexDecode(t, "c25cafc6018b98dfbb79a40ec89c575a4f88c4116489bba27707479800c0130235334a45dbe8d8dae3da8dcb45bbe5dce031b0f68ded544fda7eca30d6749442")
ad := mustHexDecode(t, "deeb0ccf3aef47a296ed1ca8f4ae5907")
ciphertext := mustHexDecode(t, "5865208eab9163db85cab9f96d846234a2626aae22f5c17c9aad4b501f4416e4")
for _, tc := range []struct {
name string
key *aessiv.Key
ciphertext []byte
}{
{
name: "No prefix",
key: mustCreateKey(t, keyBytes, 0, mustCreateParameters(t, len(keyBytes), aessiv.VariantNoPrefix)),
ciphertext: ciphertext,
},
{
name: "Tink prefix",
key: mustCreateKey(t, keyBytes, 0x01020304, mustCreateParameters(t, len(keyBytes), aessiv.VariantTink)),
ciphertext: slices.Concat(outputprefix.Tink(0x01020304), ciphertext),
},
{
name: "Crunchy prefix",
key: mustCreateKey(t, keyBytes, 0x01020304, mustCreateParameters(t, len(keyBytes), aessiv.VariantCrunchy)),
ciphertext: slices.Concat(outputprefix.Legacy(0x01020304), ciphertext),
},
} {
t.Run(tc.name, func(t *testing.T) {
d, err := aessiv.NewDeterministicAEAD(tc.key, internalapi.Token{})
if err != nil {
t.Fatalf("aessiv.NewDeterministicAEAD(%v) failed: %v", tc.key, err)
}
for i := 0; i < len(tc.ciphertext); i++ {
corruptedCiphertext := slices.Clone(tc.ciphertext)
corruptedCiphertext[i] ^= 0xff
if _, err := d.DecryptDeterministically(corruptedCiphertext, ad); err == nil {
t.Errorf("d.DecryptDeterministically(%v, %v) err = nil, want error", corruptedCiphertext, ad)
}
}
})
}
}
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