first commit

server/pkg/crypto/file_cipher_test.go

@@ -0,0 +1,31 @@
+package backupcrypto
+
+import (
+	"crypto/sha256"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestEncryptAndDecryptFile(t *testing.T) {
+	hash := sha256.Sum256([]byte("backup-secret"))
+	sourcePath := filepath.Join(t.TempDir(), "payload.bin")
+	if err := os.WriteFile(sourcePath, []byte("backup-payload"), 0o644); err != nil {
+		t.Fatalf("WriteFile returned error: %v", err)
+	}
+	encryptedPath, err := EncryptFile(hash[:], sourcePath)
+	if err != nil {
+		t.Fatalf("EncryptFile returned error: %v", err)
+	}
+	decryptedPath, err := DecryptFile(hash[:], encryptedPath)
+	if err != nil {
+		t.Fatalf("DecryptFile returned error: %v", err)
+	}
+	content, err := os.ReadFile(decryptedPath)
+	if err != nil {
+		t.Fatalf("ReadFile returned error: %v", err)
+	}
+	if string(content) != "backup-payload" {
+		t.Fatalf("unexpected decrypted content: %s", string(content))
+	}
+}