0f0e36de5f
2d1819455cb4c516f6cdf81c11e869a23dee3e6b crypto: chacha20: always use our fallback timingsafe_bcmp rather than libc's (Cory Fields) Pull request description: Looking at libc sources, apple and openbsd implementations match our naive fallback. Only FreeBSD (and only x86_64) seems to [implement an optimized version](https://github.com/freebsd/freebsd-src/blob/main/lib/libc/amd64/string/timingsafe_bcmp.S). It's not worth the hassle of using a platform-specific function for such little gain. Additionally, as mentioned below, this is the only case outside of sha2 that requires an autoconf check, and I have upcoming PRs to remove the sha2 ones. Apple's [impl is unoptimized](https://opensource.apple.com/source/Libc/Libc-1244.1.7/string/FreeBSD/timingsafe_bcmp.c.auto.html). As-is [OpenBSD's impl](https://github.com/openbsd/src/blob/master/lib/libc/string/timingsafe_bcmp.c). Relevant IRC conversation with sipa: > \<cfields\> sipa: chacha20poly1305.cpp uses libc's timingsafe_bcmp when possible. But looking around at apple/freebsd/openbsd, I don't see any impl that doesn't use the naive implementation that matches our fallback... > \<cfields\> is there any reason to belive there's an optimized impl somewhere that we're actually hitting? > \<cfields\> asking because after cleaning up sha2, timingsafe_bcmp is the last autoconf check that remains in all of crypto. It'd make life easy if we could just always use our internal one. > \<cfields\> *all of crypto/ > \<sipa\> cfields: let's get rid of the dependency then > \<sipa\> it's a trivial function > \<sipa\> and if we need it for some platforms, no real reason not to use it on all After the above discusstion, I did end up finding the x86_64-optimized FreeBSD impl, but I don't think that's all that significant. ACKs for top commit: sipa: utACK 2d1819455cb4c516f6cdf81c11e869a23dee3e6b fanquake: ACK 2d1819455cb4c516f6cdf81c11e869a23dee3e6b TheCharlatan: ACK 2d1819455cb4c516f6cdf81c11e869a23dee3e6b theStack: ACK 2d1819455cb4c516f6cdf81c11e869a23dee3e6b Tree-SHA512: b9583e19ac2f77c5d572aa5b95bc4b53669d5717e5708babef930644980de7c5d06a9c7decd5c2b559d70b8597328ecfe513375e3d8c3ef523db80012dfe9266
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
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Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.
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