go/aead/subtle/chacha20poly1305_test.go - third_party/tink - Git at Google

 // Copyright 2020 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 subtle_test

 import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
 	"math/rand"
 	"testing"

 	"golang.org/x/crypto/chacha20poly1305"
 	"github.com/google/tink/go/aead/subtle"
 	"github.com/google/tink/go/subtle/random"
 	"github.com/google/tink/go/testutil"
 )

 func TestChaCha20Poly1305EncryptDecrypt(t *testing.T) {
 	for i, test := range chaCha20Poly1305Tests {
 		key, _ := hex.DecodeString(test.key)
 		pt, _ := hex.DecodeString(test.plaintext)
 		aad, _ := hex.DecodeString(test.aad)
 		nonce, _ := hex.DecodeString(test.nonce)
 		out, _ := hex.DecodeString(test.out)

 		ca, err := subtle.NewChaCha20Poly1305(key)
 		if err != nil {
 			t.Errorf("#%d, cannot create new instance of ChaCha20Poly1305: %s", i, err)
 			continue
 		}

 		_, err = ca.Encrypt(pt, aad)
 		if err != nil {
 			t.Errorf("#%d, unexpected encryption error: %s", i, err)
 			continue
 		}

 		var combinedCt []byte
 		combinedCt = append(combinedCt, nonce...)
 		combinedCt = append(combinedCt, out...)
 		if got, err := ca.Decrypt(combinedCt, aad); err != nil {
 			t.Errorf("#%d, unexpected decryption error: %s", i, err)
 			continue
 		} else if !bytes.Equal(pt, got) {
 			t.Errorf("#%d, plaintext's don't match: got %x vs %x", i, got, pt)
 			continue
 		}
 	}
 }

 func TestChaCha20Poly1305EmptyAssociatedData(t *testing.T) {
 	key := random.GetRandomBytes(chacha20poly1305.KeySize)
 	aad := []byte{}
 	badAad := []byte{1, 2, 3}

 	ca, err := subtle.NewChaCha20Poly1305(key)
 	if err != nil {
 		t.Fatal(err)
 	}

 	for i := 0; i < 75; i++ {
 		pt := random.GetRandomBytes(uint32(i))
 		// Encrpting with aad as a 0-length array
 		{
 			ct, err := ca.Encrypt(pt, aad)
 			if err != nil {
 				t.Errorf("Encrypt(%x, %x) failed", pt, aad)
 				continue
 			}

 			if got, err := ca.Decrypt(ct, aad); err != nil || !bytes.Equal(pt, got) {
 				t.Errorf("Decrypt(Encrypt(pt, %x)): plaintext's don't match: got %x vs %x", aad, got, pt)
 			}
 			if got, err := ca.Decrypt(ct, nil); err != nil || !bytes.Equal(pt, got) {
 				t.Errorf("Decrypt(Encrypt(pt, nil)): plaintext's don't match: got %x vs %x", got, pt)
 			}
 			if _, err := ca.Decrypt(ct, badAad); err == nil {
 				t.Errorf("Decrypt(Encrypt(pt, %x)) = _, nil; want: _, err", badAad)
 			}
 		}
 		// Encrpting with aad equal to null
 		{
 			ct, err := ca.Encrypt(pt, nil)
 			if err != nil {
 				t.Errorf("Encrypt(%x, nil) failed", pt)
 			}

 			if got, err := ca.Decrypt(ct, aad); err != nil || !bytes.Equal(pt, got) {
 				t.Errorf("Decrypt(Encrypt(pt, %x)): plaintext's don't match: got %x vs %x; error: %v", aad, got, pt, err)
 			}
 			if got, err := ca.Decrypt(ct, nil); err != nil || !bytes.Equal(pt, got) {
 				t.Errorf("Decrypt(Encrypt(pt, nil)): plaintext's don't match: got %x vs %x; error: %v", got, pt, err)
 			}
 			if _, err := ca.Decrypt(ct, badAad); err == nil {
 				t.Errorf("Decrypt(Encrypt(pt, %x)) = _, nil; want: _, err", badAad)
 			}
 		}
 	}
 }

 func TestChaCha20Poly1305LongMessages(t *testing.T) {
 	dataSize := uint32(16)
 	// Encrypts and decrypts messages of size <= 8192.
 	for dataSize <= 1<<24 {
 		pt := random.GetRandomBytes(dataSize)
 		aad := random.GetRandomBytes(dataSize / 3)
 		key := random.GetRandomBytes(chacha20poly1305.KeySize)

 		ca, err := subtle.NewChaCha20Poly1305(key)
 		if err != nil {
 			t.Fatal(err)
 		}

 		ct, err := ca.Encrypt(pt, aad)
 		if err != nil {
 			t.Errorf("Encrypt(%x, %x) failed", pt, aad)
 			continue
 		}

 		if got, err := ca.Decrypt(ct, aad); err != nil || !bytes.Equal(pt, got) {
 			t.Errorf("Decrypt(Encrypt(pt, %x)): plaintext's don't match: got %x vs %x; error: %v", aad, got, pt, err)
 		}

 		dataSize += 5 * dataSize / 11
 	}
 }

 func TestChaCha20Poly1305ModifyCiphertext(t *testing.T) {
 	for i, test := range chaCha20Poly1305Tests {
 		key, _ := hex.DecodeString(test.key)
 		pt, _ := hex.DecodeString(test.plaintext)
 		aad, _ := hex.DecodeString(test.aad)

 		ca, err := subtle.NewChaCha20Poly1305(key)
 		if err != nil {
 			t.Fatal(err)
 		}

 		ct, err := ca.Encrypt(pt, aad)
 		if err != nil {
 			t.Errorf("#%d: Encrypt failed", i)
 			continue
 		}

 		if len(aad) > 0 {
 			alterAadIdx := rand.Intn(len(aad))
 			aad[alterAadIdx] ^= 0x80
 			if _, err := ca.Decrypt(ct, aad); err == nil {
 				t.Errorf("#%d: Decrypt was successful after altering additional data", i)
 				continue
 			}
 			aad[alterAadIdx] ^= 0x80
 		}

 		alterCtIdx := rand.Intn(len(ct))
 		ct[alterCtIdx] ^= 0x80
 		if _, err := ca.Decrypt(ct, aad); err == nil {
 			t.Errorf("#%d: Decrypt was successful after altering ciphertext", i)
 			continue
 		}
 		ct[alterCtIdx] ^= 0x80
 	}
 }

 // This is a very simple test for the randomness of the nonce.
 // The test simply checks that the multiple ciphertexts of the same message are distinct.
 func TestChaCha20Poly1305RandomNonce(t *testing.T) {
 	key := random.GetRandomBytes(chacha20poly1305.KeySize)
 	ca, err := subtle.NewChaCha20Poly1305(key)
 	if err != nil {
 		t.Fatal(err)
 	}

 	cts := make(map[string]bool)
 	pt, aad := []byte{}, []byte{}
 	for i := 0; i < 1<<10; i++ {
 		ct, err := ca.Encrypt(pt, aad)
 		ctHex := hex.EncodeToString(ct)
 		if err != nil || cts[ctHex] {
 			t.Errorf("TestRandomNonce failed: %v", err)
 		} else {
 			cts[ctHex] = true
 		}
 	}
 }

 func TestChaCha20Poly1305WycheproofCases(t *testing.T) {
 	testutil.SkipTestIfTestSrcDirIsNotSet(t)
 	suite := new(AEADSuite)
 	if err := testutil.PopulateSuite(suite, "chacha20_poly1305_test.json"); err != nil {
 		t.Fatalf("failed populating suite: %s", err)
 	}
 	for _, group := range suite.TestGroups {
 		if group.KeySize/8 != chacha20poly1305.KeySize {
 			continue
 		}
 		if group.IvSize/8 != chacha20poly1305.NonceSize {
 			continue
 		}

 		for _, test := range group.Tests {
 			caseName := fmt.Sprintf("%s-%s:Case-%d", suite.Algorithm, group.Type, test.CaseID)
 			t.Run(caseName, func(t *testing.T) { runChaCha20Poly1305WycheproofCase(t, test) })
 		}
 	}
 }

 func runChaCha20Poly1305WycheproofCase(t *testing.T, tc *AEADCase) {
 	var combinedCt []byte
 	combinedCt = append(combinedCt, tc.Iv...)
 	combinedCt = append(combinedCt, tc.Ct...)
 	combinedCt = append(combinedCt, tc.Tag...)

 	ca, err := subtle.NewChaCha20Poly1305(tc.Key)
 	if err != nil {
 		t.Fatalf("cannot create new instance of ChaCha20Poly1305: %s", err)
 	}

 	_, err = ca.Encrypt(tc.Msg, tc.Aad)
 	if err != nil {
 		t.Fatalf("unexpected encryption error: %s", err)
 	}

 	decrypted, err := ca.Decrypt(combinedCt, tc.Aad)
 	if err != nil {
 		if tc.Result == "valid" {
 			t.Errorf("unexpected error: %s", err)
 		}
 	} else {
 		if tc.Result == "invalid" {
 			t.Error("decrypted invalid")
 		}
 		if !bytes.Equal(decrypted, tc.Msg) {
 			t.Error("incorrect decryption")
 		}
 	}
 }
	// Copyright 2020 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 subtle_test

	import (
	"bytes"
	"encoding/hex"
	"fmt"
	"math/rand"
	"testing"

	"golang.org/x/crypto/chacha20poly1305"
	"github.com/google/tink/go/aead/subtle"
	"github.com/google/tink/go/subtle/random"
	"github.com/google/tink/go/testutil"
	)

	func TestChaCha20Poly1305EncryptDecrypt(t *testing.T) {
	for i, test := range chaCha20Poly1305Tests {
	key, _ := hex.DecodeString(test.key)
	pt, _ := hex.DecodeString(test.plaintext)
	aad, _ := hex.DecodeString(test.aad)
	nonce, _ := hex.DecodeString(test.nonce)
	out, _ := hex.DecodeString(test.out)

	ca, err := subtle.NewChaCha20Poly1305(key)
	if err != nil {
	t.Errorf("#%d, cannot create new instance of ChaCha20Poly1305: %s", i, err)
	continue
	}

	_, err = ca.Encrypt(pt, aad)
	if err != nil {
	t.Errorf("#%d, unexpected encryption error: %s", i, err)
	continue
	}

	var combinedCt []byte
	combinedCt = append(combinedCt, nonce...)
	combinedCt = append(combinedCt, out...)
	if got, err := ca.Decrypt(combinedCt, aad); err != nil {
	t.Errorf("#%d, unexpected decryption error: %s", i, err)
	continue
	} else if !bytes.Equal(pt, got) {
	t.Errorf("#%d, plaintext's don't match: got %x vs %x", i, got, pt)
	continue
	}
	}
	}

	func TestChaCha20Poly1305EmptyAssociatedData(t *testing.T) {
	key := random.GetRandomBytes(chacha20poly1305.KeySize)
	aad := []byte{}
	badAad := []byte{1, 2, 3}

	ca, err := subtle.NewChaCha20Poly1305(key)
	if err != nil {
	t.Fatal(err)
	}

	for i := 0; i < 75; i++ {
	pt := random.GetRandomBytes(uint32(i))
	// Encrpting with aad as a 0-length array
	{
	ct, err := ca.Encrypt(pt, aad)
	if err != nil {
	t.Errorf("Encrypt(%x, %x) failed", pt, aad)
	continue
	}

	if got, err := ca.Decrypt(ct, aad); err != nil \|\| !bytes.Equal(pt, got) {
	t.Errorf("Decrypt(Encrypt(pt, %x)): plaintext's don't match: got %x vs %x", aad, got, pt)
	}
	if got, err := ca.Decrypt(ct, nil); err != nil \|\| !bytes.Equal(pt, got) {
	t.Errorf("Decrypt(Encrypt(pt, nil)): plaintext's don't match: got %x vs %x", got, pt)
	}
	if _, err := ca.Decrypt(ct, badAad); err == nil {
	t.Errorf("Decrypt(Encrypt(pt, %x)) = _, nil; want: _, err", badAad)
	}
	}
	// Encrpting with aad equal to null
	{
	ct, err := ca.Encrypt(pt, nil)
	if err != nil {
	t.Errorf("Encrypt(%x, nil) failed", pt)
	}

	if got, err := ca.Decrypt(ct, aad); err != nil \|\| !bytes.Equal(pt, got) {
	t.Errorf("Decrypt(Encrypt(pt, %x)): plaintext's don't match: got %x vs %x; error: %v", aad, got, pt, err)
	}
	if got, err := ca.Decrypt(ct, nil); err != nil \|\| !bytes.Equal(pt, got) {
	t.Errorf("Decrypt(Encrypt(pt, nil)): plaintext's don't match: got %x vs %x; error: %v", got, pt, err)
	}
	if _, err := ca.Decrypt(ct, badAad); err == nil {
	t.Errorf("Decrypt(Encrypt(pt, %x)) = _, nil; want: _, err", badAad)
	}
	}
	}
	}

	func TestChaCha20Poly1305LongMessages(t *testing.T) {
	dataSize := uint32(16)
	// Encrypts and decrypts messages of size <= 8192.
	for dataSize <= 1<<24 {
	pt := random.GetRandomBytes(dataSize)
	aad := random.GetRandomBytes(dataSize / 3)
	key := random.GetRandomBytes(chacha20poly1305.KeySize)

	ca, err := subtle.NewChaCha20Poly1305(key)
	if err != nil {
	t.Fatal(err)
	}

	ct, err := ca.Encrypt(pt, aad)
	if err != nil {
	t.Errorf("Encrypt(%x, %x) failed", pt, aad)
	continue
	}

	if got, err := ca.Decrypt(ct, aad); err != nil \|\| !bytes.Equal(pt, got) {
	t.Errorf("Decrypt(Encrypt(pt, %x)): plaintext's don't match: got %x vs %x; error: %v", aad, got, pt, err)
	}

	dataSize += 5 * dataSize / 11
	}
	}

	func TestChaCha20Poly1305ModifyCiphertext(t *testing.T) {
	for i, test := range chaCha20Poly1305Tests {
	key, _ := hex.DecodeString(test.key)
	pt, _ := hex.DecodeString(test.plaintext)
	aad, _ := hex.DecodeString(test.aad)

	ca, err := subtle.NewChaCha20Poly1305(key)
	if err != nil {
	t.Fatal(err)
	}

	ct, err := ca.Encrypt(pt, aad)
	if err != nil {
	t.Errorf("#%d: Encrypt failed", i)
	continue
	}

	if len(aad) > 0 {
	alterAadIdx := rand.Intn(len(aad))
	aad[alterAadIdx] ^= 0x80
	if _, err := ca.Decrypt(ct, aad); err == nil {
	t.Errorf("#%d: Decrypt was successful after altering additional data", i)
	continue
	}
	aad[alterAadIdx] ^= 0x80
	}

	alterCtIdx := rand.Intn(len(ct))
	ct[alterCtIdx] ^= 0x80
	if _, err := ca.Decrypt(ct, aad); err == nil {
	t.Errorf("#%d: Decrypt was successful after altering ciphertext", i)
	continue
	}
	ct[alterCtIdx] ^= 0x80
	}
	}

	// This is a very simple test for the randomness of the nonce.
	// The test simply checks that the multiple ciphertexts of the same message are distinct.
	func TestChaCha20Poly1305RandomNonce(t *testing.T) {
	key := random.GetRandomBytes(chacha20poly1305.KeySize)
	ca, err := subtle.NewChaCha20Poly1305(key)
	if err != nil {
	t.Fatal(err)
	}

	cts := make(map[string]bool)
	pt, aad := []byte{}, []byte{}
	for i := 0; i < 1<<10; i++ {
	ct, err := ca.Encrypt(pt, aad)
	ctHex := hex.EncodeToString(ct)
	if err != nil \|\| cts[ctHex] {
	t.Errorf("TestRandomNonce failed: %v", err)
	} else {
	cts[ctHex] = true
	}
	}
	}

	func TestChaCha20Poly1305WycheproofCases(t *testing.T) {
	testutil.SkipTestIfTestSrcDirIsNotSet(t)
	suite := new(AEADSuite)
	if err := testutil.PopulateSuite(suite, "chacha20_poly1305_test.json"); err != nil {
	t.Fatalf("failed populating suite: %s", err)
	}
	for _, group := range suite.TestGroups {
	if group.KeySize/8 != chacha20poly1305.KeySize {
	continue
	}
	if group.IvSize/8 != chacha20poly1305.NonceSize {
	continue
	}

	for _, test := range group.Tests {
	caseName := fmt.Sprintf("%s-%s:Case-%d", suite.Algorithm, group.Type, test.CaseID)
	t.Run(caseName, func(t *testing.T) { runChaCha20Poly1305WycheproofCase(t, test) })
	}
	}
	}

	func runChaCha20Poly1305WycheproofCase(t testing.T, tc AEADCase) {
	var combinedCt []byte
	combinedCt = append(combinedCt, tc.Iv...)
	combinedCt = append(combinedCt, tc.Ct...)
	combinedCt = append(combinedCt, tc.Tag...)

	ca, err := subtle.NewChaCha20Poly1305(tc.Key)
	if err != nil {
	t.Fatalf("cannot create new instance of ChaCha20Poly1305: %s", err)
	}

	_, err = ca.Encrypt(tc.Msg, tc.Aad)
	if err != nil {
	t.Fatalf("unexpected encryption error: %s", err)
	}

	decrypted, err := ca.Decrypt(combinedCt, tc.Aad)
	if err != nil {
	if tc.Result == "valid" {
	t.Errorf("unexpected error: %s", err)
	}
	} else {
	if tc.Result == "invalid" {
	t.Error("decrypted invalid")
	}
	if !bytes.Equal(decrypted, tc.Msg) {
	t.Error("incorrect decryption")
	}
	}
	}