New submission from Christian Heimes <li...@cheimes.de>:
Python's hmac module provides a pure Python based implementation on top of the hashlib module. OpenSSL offers a dedicated HMAC implementation that has a couple of benefits over pure Python implementation: - OpenSSL HMAC is slightly faster and requires slightly less memory and allocations. - Python's HMAC only works for RFC 2104 HMACs with digests like MD5, SHA1, SHA2, and SHA3. Other digests types like Blake2 use a completely different style of HMAC. OpenSSL's HMAC API works for all sorts of digests. OpenSSL 3.0.0 also supports Blake2 MAC with its standard API. - OpenSSL HMAC is standard and compliance conform. Certain compliance restrictions require that MAC and keyed hashing is implemented in a certain way. Our HMAC code is considered a custom implementation of a crypto primitive and in violation of compliance rules. For 3.9 I plan to deprecate hmac.HMAC.digest_con, hmac.HMAC.inner, and hmac.HMAC.outer attributes. They are implementation specific details any way. I'm also going to provide a _hashlib.hmac_new() function so we can test the new code. For 3.10 I'll be switching over to _haslib.hmac_new() when the digestmod is a string or a callable that returns _hashlib.HASH code. ---------- assignee: christian.heimes components: Extension Modules messages: 369050 nosy: christian.heimes, gregory.p.smith priority: normal severity: normal stage: patch review status: open title: Use OpenSSL's HMAC API type: enhancement versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40645> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
