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While uncommon, some git repos have hundreds of thousands of
refs and slurping that output into memory can bloat the heap.
Introduce a sha_all sub in PublicInbox::SHA to loop until EOF
and rely on autodie for checking sysread errors.
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In older OpenSSL, EVP_get_digestbyname() didn't work properly
without calling OpenSSL_add_all_digests(), first. However,
OpenSSL_add_all_digests() is deprecated by OpenSSL 1.1.0 in
favor of OPENSSL_init_crypto(). Of course, OpenSSL_init_crypto()
isn't available in OpenSSL 1.0.1k nor Net::SSLeay as of 1.93_02
(2023-02-22).
Thus, instead of relying on string lookups and conditional
subroutine calls, just call EVP_sha1() and EVP_sha256() which
work on both old and new systems.
Tested with Net::SSLeay 1.55 and OpenSSL 1.0.1k on on CentOS 7.x
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On my x86-64 machine, OpenSSL SHA-256 is nearly twice as fast as
the Digest::SHA implementation from Perl, most likely due to an
optimized assembly implementation. SHA-1 is a few percent
faster, too.
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