You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
libhmac was reported malicious
OSV:MAL-2026-4194 - Malicious code in libhmac (PyPI)

libhmac
0.3.0

This version was deleted from PyPI around 2026-05-21. Installing fails with:
$ pip3 install libhmac==0.3.0 ERROR: Could not find a version that satisfies the requirement libhmac==0.3.0
View other deleted versions of libhmac

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-05-20/ \ libhmac==0.3.0
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Or, download files manually

And install manually via pip:
libhmac-0.3.0-py3-none-any.whl (332.5KB)
libhmac-0.3.0.tar.gz (331.6KB)