The padding check functions will need to tweak their calling conventions
and the constant-time helpers, so leaving those alone for now. These
were the easy ones.

BUG=22

Change-Id: Ia00e41e26a134de17d56be3def5820cb042794e1
Reviewed-on: https://boringssl-review.googlesource.com/14265
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

This is needed by trousers. As with the PSS function, the version that
assumes SHA-1 is put into decrepit.

Change-Id: I153e8ea0150e48061b978384b600a7b990d21d03
Reviewed-on: https://boringssl-review.googlesource.com/7670
Reviewed-by: David Benjamin <davidben@google.com>

These functions are just like the _mgf1 versions but omit one of the
parameters. It's easier to add them than to patch the callers in some
cases.

Change-Id: Idee5b81374bf15f2ea89b7e0c06400c2badbb275
Reviewed-on: https://boringssl-review.googlesource.com/7362
Reviewed-by: David Benjamin <davidben@google.com>

arm_arch.h is included from ARM asm files, but lives in crypto/, not
openssl/include/. Since the asm files are often built from a different
location than their position in the source tree, relative include paths
are unlikely to work so, rather than having crypto/ be a de-facto,
second global include path, this change moves arm_arch.h to
include/openssl/.

It also removes entries from many include paths because they should be
needed as relative includes are always based on the locations of the
source file.

Change-Id: I638ff43d641ca043a4fc06c0d901b11c6ff73542
Reviewed-on: https://boringssl-review.googlesource.com/5746
Reviewed-by: Adam Langley <agl@google.com>

The callback arguments are required to be NULL.

Change-Id: I266ec46efdaca411a7f0c2b645883b2c5bec1c96
Reviewed-on: https://boringssl-review.googlesource.com/5160
Reviewed-by: Adam Langley <agl@google.com>