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pythongh-99108: Add HACL* Blake2 implementation to hashlib (pythonGH-…
…119316) This replaces the existing hashlib Blake2 module with a single implementation that uses HACL\*'s Blake2b/Blake2s implementations. We added support for all the modes exposed by the Python API, including tree hashing, leaf nodes, and so on. We ported and merged all of these changes upstream in HACL\*, added test vectors based on Python's existing implementation, and exposed everything needed for hashlib. This was joint work done with @R1kM. See the PR for much discussion and benchmarking details. TL;DR: On many systems, 8-50% faster (!) than `libb2`, on some systems it appeared 10-20% slower than `libb2`.
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Misc/NEWS.d/next/Core and Builtins/2024-07-19-09-38-01.gh-issue-99108.qzM6gl.rst
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Python's hashlib now unconditionally uses the vendored HACL* library for | ||
Blake2. Python no longer accepts libb2 as an optional dependency for Blake2. | ||
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We refreshed HACL* to the latest version, and now vendor HACL*'s 128-bit and | ||
256-bit wide vector implementations for Blake2, which are used on x86/x64 | ||
toolchains when the required CPU features are available at runtime. | ||
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HACL*'s 128-bit wide vector implementation of Blake2 can also run on ARM | ||
NEON and Power8, but lacking evidence of a performance gain, these are not | ||
enabled (yet). |
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