update branch pattern in tests.yml to allow nested branches

crypt/file.go

@@ -113,14 +113,23 @@ func (f *EncryptedFile) WriteDecryptedFileToDisk(filePath string) error {
 }
 
 func (f *EncryptedFile) unpackFileAndDecrypt(packedFile []byte) error {
+	keyLen := f.privateKey.Size()
+
+	minReqLen := aes.BlockSize + keyLen + len(hmacKey)
+
+	if len(packedFile) < minReqLen {
+		return fmt.Errorf("packed file is too short to be valid")
+	}
+
 	if bytes.Contains(packedFile, []byte(hmacKey)) {
 		parts := bytes.SplitN(packedFile, []byte(hmacKey), 2)
 		packedFile, f.hmac = parts[0], parts[1]
 	}
 
-	keyLen := f.privateKey.Size()
-
 	lenWithoutKey := len(packedFile) - keyLen
+	if lenWithoutKey < aes.BlockSize {
+		return fmt.Errorf("packed file is too short to contain valid nonce and ciphertext")
+	}
 
 	packedFile, f.symmetricKeyEnc = packedFile[0:lenWithoutKey], packedFile[lenWithoutKey:]