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Whenever setting negative to one (or when it could potentially be one),
always use BN_set_negative() since it checks for a zero valued bignum and
will not permit negative to be set in this case. Since BN_is_zero()
currently relies on top == 0, call BN_set_negative() after top has been
set (or bn_correct_top() has been called).
This fixes a long standing issue where -0 and +0 have been permitted,
however multiple code paths (such as BN_cmp()) fail to treat these as
equivalent.
Prompted by Guido Vranken who is adding negative zero fuzzing to oss-fuzz.
ok tb@
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Libcrypto currently has a mess of *_lcl.h, *_locl.h, and *_local.h names
used for internal headers. Move all these headers we inherited from
OpenSSL to *_local.h, reserving the name *_internal.h for our own code.
Similarly, move dtls_locl.h and ssl_locl.h to dtls_local and ssl_local.h.
constant_time_locl.h is moved to constant_time.h since it's special.
Adjust all .c files in libcrypto, libssl and regress.
The diff is mechanical with the exception of tls13_quic.c, where
#include <ssl_locl.h> was fixed manually.
discussed with jsing,
no objection bcook
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Compiling with BN_DEBUG (and if you want to take it further, BN_DEBUG_RAND)
supposedly adds consistency checks to the BN code. These are rarely if ever
used and introduce a bunch of clutter in the code. Furthermore, there are
hacks in place to undo things that the debugging code does.
Remove all of this mess and instead rely on always enabled checks, more
readable code and proper regress coverage to ensure correct behaviour.
"Good riddance." tb@
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found with CodeChecker
feedback from millert@
ok tb@
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as was done earlier in libssl. Thanks inoguchi@ for noticing
libssl had more reacharounds into this.
ok jsing@ inoguchi@
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Remove the openssl public includes from cryptlib.h and add a small number
of includes into the source files that actually need them. While here,
also sort/group/tidy the includes.
ok beck@ miod@
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functionality for shared libs.
Note that routines such as sslv2_init and friends that use RSA will
not work due to lack of RSA in this library.
Needs documentation and help from ports for easy upgrade to full
functionality where legally possible.
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