bpo-40645: Implement HMAC in C (GH-20129) #20129
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The internal module ``_hashlib`` wraps and exposes OpenSSL's HMAC API. The new code will be used in Python 3.10 after the internal implementation details of the pure Python HMAC module are no longer part of the public API. The code is based on a patch by Petr Viktorin for RHEL and Python 3.6. news.gmane.io Co-Authored-By: Petr Viktorin <encukou@gmail.com> Signed-off-by: Christian Heimes <christian@python.org>
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@gpshead I'm merging the PR without your ACK to get it into Python 3.9 before beta freeze. In case you don't like it I can remove it from 3.9 and postpone the new feature to 3.10. |
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May 24, 2020
The internal module ``_hashlib`` wraps and exposes OpenSSL's HMAC API. The new code will be used in Python 3.10 after the internal implementation details of the pure Python HMAC module are no longer part of the public API. The code is based on a patch by Petr Viktorin for RHEL and Python 3.6. Co-Authored-By: Petr Viktorin <encukou@gmail.com>
| if (self->lock != NULL) { | ||
| ENTER_HASHLIB(self); | ||
| r = HMAC_Update(self->ctx, (const unsigned char*)view.buf, view.len); | ||
| LEAVE_HASHLIB(self); |
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Looking at the definition of ENTER_HASHLIB, I believe that the GIL is released only while acquiring the HMACobject lock, and not during the actual HMAC_Update.
It seems the intention was to release it for HMAC_Update as well, which is what EVP_update does. If that's the case, then I think this should use the same approach as EVP_update. Something like
Py_BEGIN_ALLOW_THREADS
PyThread_acquire_lock(self->lock, 1);
r = HMAC_Update(self->ctx, (const unsigned char*)view.buf, view.len);
PyThread_release_lock(self->lock);
Py_END_ALLOW_THREADS
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Good catch. True. https://bugs.python.org/issue44145 filed to track and fix.
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The internal module
_hashlibwraps and exposes OpenSSL's HMAC API. Thenew code will be used in Python 3.10 after the internal implementation
details of the pure Python HMAC module are no longer part of the public API.
The code is based on a patch by Petr Viktorin for RHEL and Python 3.6.
https://bugs.python.org/issue40645