Fix bug with always riv encrypting files

pubnub/crypto.py

@@ -85,9 +85,10 @@ def get_secret(self, key):
 
 
 class PubNubFileCrypto(PubNubCryptodome):
-    def encrypt(self, key, file):
+    def encrypt(self, key, file, use_random_iv=True):
+
         secret = self.get_secret(key)
-        initialization_vector = self.get_initialization_vector(use_random_iv=True)
+        initialization_vector = self.get_initialization_vector(use_random_iv)
         cipher = AES.new(bytes(secret[0:32], "utf-8"), self.mode, bytes(initialization_vector, 'utf-8'))
         initialization_vector = bytes(initialization_vector, 'utf-8')
 
@@ -97,9 +98,9 @@ def encrypt(self, key, file):
             initialization_vector=initialization_vector
         )
 
-    def decrypt(self, key, file):
+    def decrypt(self, key, file, use_random_iv=True):
         secret = self.get_secret(key)
-        initialization_vector, extracted_file = self.extract_random_iv(file, use_random_iv=True)
+        initialization_vector, extracted_file = self.extract_random_iv(file, use_random_iv)
         try:
             cipher = AES.new(bytes(secret[0:32], "utf-8"), self.mode, initialization_vector)
             result = unpad(cipher.decrypt(extracted_file), 16)

tests/acceptance/encryption/steps/then_steps.py

@@ -13,7 +13,7 @@ def step_impl(context: PNContext):
     config = PNConfiguration()
     config.cipher_key = context.cipher_key
     config.use_random_initialization_vector = context.use_random_iv
-    decrypted_legacy = config.file_crypto.decrypt(context.cipher_key, context.encrypted_file)
+    decrypted_legacy = config.file_crypto.decrypt(context.cipher_key, context.encrypted_file, context.use_random_iv)
     assert decrypted_legacy == context.decrypted_file
     assert context.outcome == 'success'