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-rw-r--r--client/src/leap/soledad/client/_crypto.py30
1 files changed, 13 insertions, 17 deletions
diff --git a/client/src/leap/soledad/client/_crypto.py b/client/src/leap/soledad/client/_crypto.py
index 8dbdc094..923891fc 100644
--- a/client/src/leap/soledad/client/_crypto.py
+++ b/client/src/leap/soledad/client/_crypto.py
@@ -300,8 +300,7 @@ class BlobEncryptor(object):
result.write(
base64.urlsafe_b64encode(encrypted + self.tag))
else:
- result.write(encrypted)
- result.write(self.tag)
+ result.write(encrypted + self.tag)
result.seek(0)
return defer.succeed(result)
@@ -319,28 +318,25 @@ class BlobDecryptor(object):
# TODO enable the ascii armor = False
def __init__(self, doc_info, ciphertext_fd, result=None,
- secret=None, armor=True, start_stream=True):
+ secret=None, armor=True, start_stream=True, tag=None):
if not secret:
raise EncryptionDecryptionError('no secret given')
- if armor is False:
- raise NotImplementedError
self.doc_id = doc_info.doc_id
self.rev = doc_info.rev
self.fd = ciphertext_fd
self.armor = armor
self._producer = None
+ self.result = result or BytesIO()
+ self.sym_key = _get_sym_key_for_doc(doc_info.doc_id, secret)
self.size = None
-
+ self.tag = tag
preamble, iv = self._consume_preamble()
assert preamble
assert iv
-
- self.result = result or BytesIO()
- sym_key = _get_sym_key_for_doc(doc_info.doc_id, secret)
-
- self._aes = AESWriter(sym_key, iv, self.result, tag=self.tag)
+ self._aes = AESWriter(self.sym_key, iv, self.result, tag=self.tag)
self._aes.authenticate(preamble)
+
if start_stream:
self._start_stream()
@@ -348,14 +344,14 @@ class BlobDecryptor(object):
self._producer = FileBodyProducer(self.fd, readSize=2**16)
def _consume_preamble(self):
-
self.fd.seek(0)
try:
- parts = self.fd.getvalue().split()
- encoded_preamble = parts[0]
- preamble = base64.urlsafe_b64decode(encoded_preamble)
- ciphertext = base64.urlsafe_b64decode(parts[1])
- self.tag, ciphertext = ciphertext[-16:], ciphertext[:-16]
+ preamble, ciphertext = self.fd.getvalue().split(SEPARATOR, 1)
+ preamble = base64.urlsafe_b64decode(preamble)
+ if self.armor:
+ ciphertext = base64.urlsafe_b64decode(ciphertext)
+ tag, ciphertext = ciphertext[-16:], ciphertext[:-16]
+ self.tag = self.tag or tag
except (TypeError, ValueError):
raise InvalidBlob