chore(python): removing pyblake2 as a required library

python/requirements.txt

@@ -5,5 +5,4 @@ click>=7,<9
 libusb1>=1.6.4
 construct>=2.9,!=2.10.55
 typing_extensions>=3.7.4
-pyblake2>=0.9.3 ; python_version<'3.6'
 attrs

python/setup.py

@@ -13,7 +13,6 @@ install_requires = [
     "libusb1>=1.6.4",
     "construct>=2.9",
     "typing_extensions>=3.7.4",
-    "pyblake2>=0.9.3 ; python_version<'3.6'",
     "attrs",
 ]
 

python/src/trezorlib/_internal/firmware_headers.py

@@ -1,5 +1,6 @@
 import struct
 from enum import Enum
+from hashlib import blake2s
 from typing import Any, List, Optional
 
 import click
@@ -7,12 +8,6 @@ import construct as c
 
 from .. import cosi, firmware
 
-try:
-    from hashlib import blake2s
-except ImportError:
-    from pyblake2 import blake2s
-
-
 SYM_OK = click.style("\u2714", fg="green")
 SYM_FAIL = click.style("\u274c", fg="red")
 

python/src/trezorlib/firmware.py

@@ -16,6 +16,7 @@
 
 import hashlib
 from enum import Enum
+from hashlib import blake2s
 from typing import Callable, List, Tuple
 
 import construct as c
@@ -23,12 +24,6 @@ import ecdsa
 
 from . import cosi, messages, tools
 
-try:
-    from hashlib import blake2s
-except ImportError:
-    from pyblake2 import blake2s
-
-
 V1_SIGNATURE_SLOTS = 3
 V1_BOOTLOADER_KEYS = [
     bytes.fromhex(key)