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Some servers have very restrictive TLS stacks that respond badly
to a bug in the SChannel TLS implementation, meaning that TLS
has to be limited to 1.0.
Add ClientOptions.tlsOptions. This is a method of passing options into
the TLS stack. It's currently
only used for the TLS 1.0 workaround in SChannel, but we might reasonably
expose other options in the future, such as limiting cypher suites.
Disables use of SSLv3 for SChannel
Also updates the coding style in SchannelContext a bit.
Test-Information:
Compiles on both OS X and Windows(SChannel). OS X doesn't show the new
option. Windows shows it, and remembers it between logins. Not tested
against a server requiring 1.0 only, but a previous hack with the
same approach was tested.
Change-Id: I1e7854d43811fd173f21f98d4dc3915fc7a4b322
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Swift