fix(backups): improved archive encryption [EE-6764] (#11489)

api/crypto/aes_test.go

@@ -2,6 +2,7 @@ package crypto
 
 import (
 	"io"
+	"math/rand"
 	"os"
 	"path/filepath"
 	"testing"
@@ -9,7 +10,19 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+func randBytes(n int) []byte {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return b
+}
+
 func Test_encryptAndDecrypt_withTheSamePassword(t *testing.T) {
+	const passphrase = "passphrase"
+
 	tmpdir := t.TempDir()
 
 	var (
@@ -18,17 +31,99 @@ func Test_encryptAndDecrypt_withTheSamePassword(t *testing.T) {
 		decryptedFilePath = filepath.Join(tmpdir, "decrypted")
 	)
 
-	content := []byte("content")
+	content := randBytes(1024*1024*100 + 523)
+	os.WriteFile(originFilePath, content, 0600)
+
+	originFile, _ := os.Open(originFilePath)
+	defer originFile.Close()
+
+	encryptedFileWriter, _ := os.Create(encryptedFilePath)
+
+	err := AesEncrypt(originFile, encryptedFileWriter, []byte(passphrase))
+	assert.Nil(t, err, "Failed to encrypt a file")
+	encryptedFileWriter.Close()
+
+	encryptedContent, err := os.ReadFile(encryptedFilePath)
+	assert.Nil(t, err, "Couldn't read encrypted file")
+	assert.NotEqual(t, encryptedContent, content, "Content wasn't encrypted")
+
+	encryptedFileReader, _ := os.Open(encryptedFilePath)
+	defer encryptedFileReader.Close()
+
+	decryptedFileWriter, _ := os.Create(decryptedFilePath)
+	defer decryptedFileWriter.Close()
+
+	decryptedReader, err := AesDecrypt(encryptedFileReader, []byte(passphrase))
+	assert.Nil(t, err, "Failed to decrypt file")
+
+	io.Copy(decryptedFileWriter, decryptedReader)
+
+	decryptedContent, _ := os.ReadFile(decryptedFilePath)
+	assert.Equal(t, content, decryptedContent, "Original and decrypted content should match")
+}
+
+func Test_encryptAndDecrypt_withStrongPassphrase(t *testing.T) {
+	const passphrase = "A strong passphrase with special characters: !@#$%^&*()_+"
+	tmpdir := t.TempDir()
+
+	var (
+		originFilePath    = filepath.Join(tmpdir, "origin2")
+		encryptedFilePath = filepath.Join(tmpdir, "encrypted2")
+		decryptedFilePath = filepath.Join(tmpdir, "decrypted2")
+	)
+
+	content := randBytes(500)
+	os.WriteFile(originFilePath, content, 0600)
+
+	originFile, _ := os.Open(originFilePath)
+	defer originFile.Close()
+
+	encryptedFileWriter, _ := os.Create(encryptedFilePath)
+
+	err := AesEncrypt(originFile, encryptedFileWriter, []byte(passphrase))
+	assert.Nil(t, err, "Failed to encrypt a file")
+	encryptedFileWriter.Close()
+
+	encryptedContent, err := os.ReadFile(encryptedFilePath)
+	assert.Nil(t, err, "Couldn't read encrypted file")
+	assert.NotEqual(t, encryptedContent, content, "Content wasn't encrypted")
+
+	encryptedFileReader, _ := os.Open(encryptedFilePath)
+	defer encryptedFileReader.Close()
+
+	decryptedFileWriter, _ := os.Create(decryptedFilePath)
+	defer decryptedFileWriter.Close()
+
+	decryptedReader, err := AesDecrypt(encryptedFileReader, []byte(passphrase))
+	assert.Nil(t, err, "Failed to decrypt file")
+
+	io.Copy(decryptedFileWriter, decryptedReader)
+
+	decryptedContent, _ := os.ReadFile(decryptedFilePath)
+	assert.Equal(t, content, decryptedContent, "Original and decrypted content should match")
+}
+
+func Test_encryptAndDecrypt_withTheSamePasswordSmallFile(t *testing.T) {
+	tmpdir := t.TempDir()
+
+	var (
+		originFilePath    = filepath.Join(tmpdir, "origin2")
+		encryptedFilePath = filepath.Join(tmpdir, "encrypted2")
+		decryptedFilePath = filepath.Join(tmpdir, "decrypted2")
+	)
+
+	content := randBytes(500)
 	os.WriteFile(originFilePath, content, 0600)
 
 	originFile, _ := os.Open(originFilePath)
 	defer originFile.Close()
 
 	encryptedFileWriter, _ := os.Create(encryptedFilePath)
-	defer encryptedFileWriter.Close()
 
 	err := AesEncrypt(originFile, encryptedFileWriter, []byte("passphrase"))
 	assert.Nil(t, err, "Failed to encrypt a file")
+	encryptedFileWriter.Close()
+
 	encryptedContent, err := os.ReadFile(encryptedFilePath)
 	assert.Nil(t, err, "Couldn't read encrypted file")
 	assert.NotEqual(t, encryptedContent, content, "Content wasn't encrypted")
@@ -57,7 +152,7 @@ func Test_encryptAndDecrypt_withEmptyPassword(t *testing.T) {
 		decryptedFilePath = filepath.Join(tmpdir, "decrypted")
 	)
 
-	content := []byte("content")
+	content := randBytes(1024 * 50)
 	os.WriteFile(originFilePath, content, 0600)
 
 	originFile, _ := os.Open(originFilePath)
@@ -96,7 +191,7 @@ func Test_decryptWithDifferentPassphrase_shouldProduceWrongResult(t *testing.T)
 		decryptedFilePath = filepath.Join(tmpdir, "decrypted")
 	)
 
-	content := []byte("content")
+	content := randBytes(1034)
 	os.WriteFile(originFilePath, content, 0600)
 
 	originFile, _ := os.Open(originFilePath)
@@ -117,11 +212,6 @@ func Test_decryptWithDifferentPassphrase_shouldProduceWrongResult(t *testing.T)
 	decryptedFileWriter, _ := os.Create(decryptedFilePath)
 	defer decryptedFileWriter.Close()
 
-	decryptedReader, err := AesDecrypt(encryptedFileReader, []byte("garbage"))
-	assert.Nil(t, err, "Should allow to decrypt with wrong passphrase")
-
-	io.Copy(decryptedFileWriter, decryptedReader)
-
-	decryptedContent, _ := os.ReadFile(decryptedFilePath)
-	assert.NotEqual(t, content, decryptedContent, "Original and decrypted content should NOT match")
+	_, err = AesDecrypt(encryptedFileReader, []byte("garbage"))
+	assert.NotNil(t, err, "Should not allow decrypt with wrong passphrase")
 }