perf(ripemd160): use hashlib fast path when available#92
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The pure-Python RIPEMD160 implementation is hot on every Hash160 and
script-evaluation call. When the host OpenSSL build exposes ripemd160
(via the legacy provider on OpenSSL 3, or natively on older builds),
delegate to hashlib for a significant speedup.
Probe once at import time with hashlib.new('ripemd160', b'') and keep
the pure-Python path as _ripemd160_pure so it remains the source of
truth for correctness and continues to work where OpenSSL no longer
provides RIPEMD160.
Expand the test module with three cases: vectors via the public
ripemd160 entry point, vectors via _ripemd160_pure, and a cross-check
that both paths agree on the same input.
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The pure-Python RIPEMD160 implementation is hot on every Hash160 and script-evaluation call. When the host OpenSSL build exposes ripemd160 (via the legacy provider on OpenSSL 3, or natively on older builds), delegate to hashlib for a significant speedup.
Probe once at import time with hashlib.new('ripemd160', b'') and keep the pure-Python path as _ripemd160_pure so it remains the source of truth for correctness and continues to work where OpenSSL no longer provides RIPEMD160.
Expand the test module with three cases: vectors via the public ripemd160 entry point, vectors via _ripemd160_pure, and a cross-check that both paths agree on the same input.