Td4 is an array of u8. A u8 << int promotes the u8 to an int first then shifts.
If the mathematical result of a shift (as modelled by lhs * 2^{rhs}) is not
representable in an integer, behaviour is undefined. In other words, you can't
shift into the sign bit of a signed integer. Fix this by casting to u32
whenever we're shifting left by 24.

(For consistency, cast other shifts, too.)

Caught by -fsanitize=shift

Submitted by Nick Lewycky (Google)

(Imported from upstream's 8b37e5c14f0eddb10c7f91ef91004622d90ef361.)

Change-Id: Id0f98d1d65738533c6ddcc3c21bc38b569d74793
Reviewed-on: https://boringssl-review.googlesource.com/4040
Reviewed-by: Adam Langley <agl@google.com>

Te4 is used in in crypto/aes/aes.c. It's used upstream in an alternate
implementation of AES_set_encrypt_key not included in our version.

Change-Id: I5704dbc714bdb05ef515cbf2aff5e43c3b62c5b2
Reviewed-on: https://boringssl-review.googlesource.com/3061
Reviewed-by: Adam Langley <agl@google.com>

This resolves a pile of MSVC warnings in Chromium.

Change-Id: Ib9a29cb88d8ed8ec4118d153260f775be059a803
Reviewed-on: https://boringssl-review.googlesource.com/1865
Reviewed-by: Adam Langley <agl@google.com>

This change marks public symbols as dynamically exported. This means
that it becomes viable to build a shared library of libcrypto and libssl
with -fvisibility=hidden.

On Windows, one not only needs to mark functions for export in a
component, but also for import when using them from a different
component. Because of this we have to build with
|BORINGSSL_IMPLEMENTATION| defined when building the code. Other
components, when including our headers, won't have that defined and then
the |OPENSSL_EXPORT| tag becomes an import tag instead. See the #defines
in base.h

In the asm code, symbols are now hidden by default and those that need
to be exported are wrapped by a C function.

In order to support Chromium, a couple of libssl functions were moved to
ssl.h from ssl_locl.h: ssl_get_new_session and ssl_update_cache.

Change-Id: Ib4b76e2f1983ee066e7806c24721e8626d08a261
Reviewed-on: https://boringssl-review.googlesource.com/1350
Reviewed-by: Adam Langley <agl@google.com>

Windows complains when the declaration of a function doesn't match the
definition. In this case, the |bits| argument (not a pointer, just an
unsigned) was marked as const in the definition only.

Normally const isn't used for non-pointer arguments so I've removed it
in this case to make Windows compile.

https://code.google.com/p/chromium/issues/detail?id=398960

Change-Id: If7386cf61f9dfbf6b32bfada1a49d5742fe94396
Reviewed-on: https://boringssl-review.googlesource.com/1338
Reviewed-by: Adam Langley <agl@google.com>

Initial fork from f2d678e6e8 (1.0.2 beta).

(This change contains substantial changes from the original and
effectively starts a new history.)