Fix bug with sha1 tokens

Previously, when a user wanted to generate an sha1 token, sha256
was used instead. This patch fixes the bug even though the use
of sha1 is discouraged.

softtoken/softtoken.py

@@ -142,7 +142,7 @@ def main():
         sys.exit(2)
 
     if args.hash_function == 'sha1':
-        hf = hashlib.sha256
+        hf = hashlib.sha1
     elif args.hash_function == 'sha256':
         hf = hashlib.sha256
     elif args.hash_function == 'sha512':