Replace pycryptodome with cryptography.

This will make it easier to support older distros. For example ubuntu 16.04 and Debian stable (9)

README.md

@@ -88,7 +88,7 @@ are usually available from your distribution’s package repositories. If
 you don’t have them, some features will not be working.
 
 -  [Python](https://www.python.org/) 3.4 or higher
--  [pycryptodome](https://www.pycryptodome.org/en/latest/) to download encrypted HLS streams
+-  [cryptography](https://cryptography.io/en/latest/) to download encrypted HLS streams
 -  [PyYaml](https://github.com/yaml/pyyaml) for configure file
 -  [Requests](http://www.python-requests.org/)
 -  [PySocks](https://github.com/Anorov/PySocks) to enable proxy support

dockerfile/Dockerfile

@@ -1,18 +1,16 @@
 # using edge to get ffmpeg-4.x
-# using testing repo to get pycryptodome
 FROM alpine:edge
 MAINTAINER spaam
 
 COPY dist/*.whl .
 
 RUN set -xe \
-	&& echo 'http://dl-cdn.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories  \
     && apk add --no-cache \
 	    ca-certificates \
 	    python3 \
         py3-pip \
         rtmpdump \
-        py3-pycryptodome \
+        py3-cryptography \
         ffmpeg \
     && python3 -m pip install *.whl \
     && rm -f *.whl

lib/svtplay_dl/fetcher/hls.py

@@ -127,14 +127,11 @@ class HLS(VideoRetriever):
         key = None
 
         if m3u8.encrypted:
-            from Crypto.Cipher import AES
+            from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+            from cryptography.hazmat.backends import default_backend
 
         def random_iv():
-            try:
-                from Crypto import Random
-                return Random.new().read(AES.block_size)
-            except ImportError:
-                return os.urandom(16)
+            return os.urandom(16)
         file_d = output(file_name[0], self.config, file_name[1])
         if file_d is None:
             return
@@ -180,10 +177,12 @@ class HLS(VideoRetriever):
                         raise HLSException(keyurl, "Can't decrypt beacuse of DRM")
                     key = self.http.request("get", keyurl, cookies=keycookies, headers=headers).content
                     iv = binascii.unhexlify(i["EXT-X-KEY"]["IV"][2:].zfill(32)) if "IV" in i["EXT-X-KEY"] else random_iv()
-                    decryptor = AES.new(key, AES.MODE_CBC, iv)
+                    backend = default_backend()
+                    cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
+                    decryptor = cipher.decryptor()
 
                 if decryptor:
-                    data = decryptor.decrypt(data)
+                    data = decryptor.update(data) + decryptor.finalize()
                 else:
                     raise ValueError("No decryptor found for encrypted hls steam.")
 

requirements.txt

@@ -1,4 +1,4 @@
 requests
 PySocks
-pycryptodome
+cryptography
 pyyaml

setup.py

@@ -18,7 +18,7 @@ with open(os.path.join(srcdir, 'svtplay_dl', '__version__.py'), 'r') as f:
 deps = []
 deps.append("requests>=2.0.0")
 deps.append("PySocks")
-deps.append("pycryptodome")
+deps.append("cryptography")
 deps.append("pyyaml")
 
 setup(