--- a/cutils/shasum.py	Wed Apr 20 17:03:57 2022 +0200
+++ b/cutils/shasum.py	Wed Apr 20 23:15:55 2022 +0200
@@ -380,6 +380,16 @@
             return None
 
 
+def get_blake2b():
+    """Get the factory for blake2b"""
+    return hashlib.blake2b
+
+
+def get_blake2s():
+    """Get the factory for blake2s"""
+    return hashlib.blake2s
+
+
 def argv2algo(s):
     """Convert a command line algorithm specifier into a tuple with the
     type/factory of the digest and the algorithms tag for output purposes.
@@ -411,9 +421,9 @@
     elif s in ("3-512", "sha3-512"):
         return (hashlib.sha3_512, "SHA3-512")
     elif s in ("blake2b", "blake2b-512"):
-        return (hashlib.blake2b, "BLAKE2b")
+        return (get_blake2b(), "BLAKE2b")
     elif s in ("blake2s", "blake2s-256"):
-        return (hashlib.blake2s, "BLAKE2s")
+        return (get_blake2s(), "BLAKE2s")
     elif s == "md5":
         return (hashlib.md5, "MD5")
     else:
@@ -450,9 +460,9 @@
     elif s == "SHA3-512":
         return hashlib.sha3_512
     elif s == "BLAKE2b":
-        return hashlib.blake2b
+        return get_blake2b()
     elif s == "BLAKE2s":
-        return hashlib.blake2s
+        return get_blake2s()
     elif s == "MD5":
         return hashlib.md5
     else: