This change follows up from e759a9cd with more extensive changes and
tests:

If a name checking function (like |X509_VERIFY_PARAM_set1_host|) fails,
it now poisons the |X509_VERIFY_PARAM| so that all verifications will
fail. This is because we have observed that some callers are not
checking the return value of these functions.

Using a length of zero for a hostname to mean |strlen| is now an error.
It also an error for email addresses and IP addresses now, and doesn't
end up trying to call |strlen| on a (binary) IP address.

Setting an email address with embedded NULs now fails. So does trying to
configure an empty hostname or email with (NULL, 0).

|X509_check_*| functions in BoringSSL don't accept zero lengths (unlike
OpenSSL). It's now tested that such calls always fail.

Change-Id: I4484176f2aae74e502a09081c7e912c85e8d090b
Update-Note: several behaviour changes. See change description.
Reviewed-on: https://boringssl-review.googlesource.com/26764
Reviewed-by: David Benjamin <davidben@google.com>

OpenSSL upstream did a bulk reformat. We still have some files that have
the old OpenSSL style and this makes applying patches to them more
manual, and thus more error-prone, than it should be.

This change is the result of running
  util/openssl-format-source -v -c .
in the enumerated directories. A few files were in BoringSSL style and
have not been touched.

This change should be formatting only; no semantic difference.

Change-Id: I75ced2970ae22b9facb930a79798350a09c5111e
Reviewed-on: https://boringssl-review.googlesource.com/6904
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>

Reduces number of silly casts in OpenSSL code and likely most
applications.  Consistent with (char *) for "peername" value from
X509_check_host() and X509_VERIFY_PARAM_get0_peername().

(Imported from upstream's e83c913723fac7432a7706812f12394aaa00e8ce.)

Change-Id: Id0fc11773a0cee8933978cd4bdbd8251fd7cfb5f

Declaration, memory management, accessor and documentation.

(Imported from upstream's 1eb57ae2b78c119bfba7ab647951130e968d1664.)

Change-Id: Ifa9672e46445e44a78001b0f9430a93c138d73d7

(Imported from upstream's 8abffa4a73fcbf6536e0a42d736ed9211a8204ea,
9624b50d51 and
41e3ebd5abacfdf98461cdeb6fa97a4175b7aad3.)

Change-Id: Ic9099eb5704b19b4500229e89351371cc6184f9d

Just store NUL-terminated strings. This works better when we add
support for multiple hostnames.

(Imported from upstream's d93edc0aab98377f42dd19312248597a018a7889.)

Change-Id: Ib3bf8a8c654b829b4432782ba21ba55c3d4a0582

Fixes to host checking wild card support and add support for setting
host checking flags when verifying a certificate chain.

(Imported from upstream's a2219f6be3)

Initial fork from f2d678e6e8 (1.0.2 beta).

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