hanging object references in helper functions avoided

Author: abdulsmapara

src/aws_encryption_sdk/__init__.py

@@ -15,6 +15,7 @@
     StreamEncryptor,
 )
 from aws_encryption_sdk.structures import CryptoResult
+import copy
 
 __all__ = ("encrypt", "decrypt", "stream")
 
@@ -84,7 +85,10 @@ def encrypt(**kwargs):
     with StreamEncryptor(**kwargs) as encryptor:
         ciphertext = encryptor.read()
 
-    return CryptoResult(result=ciphertext, header=encryptor.header, keyring_trace=encryptor.keyring_trace)
+    header_copy = copy.deepcopy(encryptor.header)
+    keyring_trace_copy = copy.deepcopy(encryptor.keyring_trace)
+
+    return CryptoResult(result=ciphertext, header=header_copy, keyring_trace=keyring_trace_copy)
 
 
 def decrypt(**kwargs):
@@ -143,7 +147,10 @@ def decrypt(**kwargs):
     with StreamDecryptor(**kwargs) as decryptor:
         plaintext = decryptor.read()
 
-    return CryptoResult(result=plaintext, header=decryptor.header, keyring_trace=decryptor.keyring_trace)
+    header_copy = copy.deepcopy(decryptor.header)
+    keyring_trace_copy = copy.deepcopy(decryptor.keyring_trace)
+
+    return CryptoResult(result=plaintext, header=header_copy, keyring_trace=keyring_trace_copy)
 
 
 def stream(**kwargs):