Add md5 type checksum type.

fck/cktype/__init__.py

@@ -3,8 +3,10 @@ from typing import Dict, Optional, Type
 from fck.cktype.cktypeinterface import CKTYPEINTERFACE as CKTYPEINTERFACE
 
 from .crc32 import CRC32
+from .md5 import MD5
 
 CKTYPES: Dict[str, Type[MD5 | CRC32]] = {
+    "MD5": (MD5),
     "CRC32": (CRC32),
 }
 

fck/cktype/md5.py

@@ -0,0 +1,26 @@
+from typing import List
+from re import compile, Pattern
+from hashlib import md5
+
+
+class MD5(object):
+    NAME: str = "MD5"
+    EXT: List[str] = [".md5"]
+    SYNTAX: List[Pattern] = [compile(r"^;*$"), compile(r"^.* [0-9a-fA-F]{8}$")]
+    REGEX: Pattern = compile(r"[0-9a-fA-F]{32}")
+    NULL: str = "D41D8CD98F00B204E9800998ECF8427E"
+
+    def __init__(self):
+        self.cksum = md5(usedforsecurity=False)
+
+    def gensum(self, data: bytes):
+        self.cksum.update(data)
+
+    def reset(self):
+        self.__init__()
+
+    def format(self, fpath) -> str:
+        return " ".join([self.__repr__(), fpath])
+
+    def __repr__(self) -> str:
+        return self.cksum.hexdigest().upper()