hmac: Fix passing in a string for digestmod argument.

The built-in `hashlib` module does not have a `.new` method (although the
Python version in this repository does).

python-stdlib/hmac/hmac.py

@@ -17,7 +17,7 @@ def __init__(self, key, msg=None, digestmod=None):
             make_hash = digestmod  # A
         elif isinstance(digestmod, str):
             # A hash name suitable for hashlib.new().
-            make_hash = lambda d=b"": hashlib.new(digestmod, d)  # B
+            make_hash = lambda d=b"": getattr(hashlib, digestmod)(d)
         else:
             # A module supporting PEP 247.
             make_hash = digestmod.new  # C

python-stdlib/hmac/manifest.py

@@ -1,3 +1,3 @@
-metadata(version="3.4.3")
+metadata(version="3.4.4")
 
 module("hmac.py")

python-stdlib/hmac/test_hmac.py

@@ -8,7 +8,7 @@
 
 msg = b"zlutoucky kun upel dabelske ody"
 
-dig = hmac.new(b"1234567890", msg=msg, digestmod=hashlib.sha256).hexdigest()
+dig = hmac.new(b"1234567890", msg=msg, digestmod="sha256").hexdigest()
 
 print("c735e751e36b08fb01e25794bdb15e7289b82aecdb652c8f4f72f307b39dad39")
 print(dig)