merged lbrynet/cryptstream into lbrynet/blob

lbrynet/blob/client/CryptBlobHandler.py

@@ -0,0 +1,22 @@
+import binascii
+from twisted.internet import defer
+from lbrynet.cryptstream.CryptBlob import StreamBlobDecryptor
+
+
+class CryptBlobHandler:
+    #implements(IBlobHandler)
+
+    def __init__(self, key, write_func):
+        self.key = key
+        self.write_func = write_func
+
+    ######## IBlobHandler #########
+
+    def handle_blob(self, blob, blob_info):
+        try:
+            blob_decryptor = StreamBlobDecryptor(blob, self.key, binascii.unhexlify(blob_info.iv),
+                                                 blob_info.length)
+        except ValueError as err:
+            return defer.fail(err)
+        d = blob_decryptor.decrypt(self.write_func)
+        return d