Custom RSA and ECDSA keys may not expose the key material. Plumb and "opaque"
bit out of the *_METHOD up to EVP_PKEY. Query that in ssl_rsa.c to skip the
sanity checks for certificate and key matching.

Change-Id: I362a2d5116bfd1803560dfca1d69a91153e895fc
Reviewed-on: https://boringssl-review.googlesource.com/1255
Reviewed-by: Adam Langley <agl@google.com>

It's unused with SSLv2 gone. Also, being a decryption padding check, it really
should be constant-time and isn't.

Change-Id: I96be02cb50f9bf0229b9174eccd80fa338bf8e3e
Reviewed-on: https://boringssl-review.googlesource.com/1254
Reviewed-by: Adam Langley <agl@google.com>

Previously, public headers lived next to the respective code and there
were symlinks from include/openssl to them.

This doesn't work on Windows.

This change moves the headers to live in include/openssl. In cases where
some symlinks pointed to the same header, I've added a file that just
includes the intended target. These cases are all for backwards-compat.

Change-Id: I6e285b74caf621c644b5168a4877db226b07fd92
Reviewed-on: https://boringssl-review.googlesource.com/1180
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>

Match the other EVP_DigestSignFinal implementations. Fix the instances in
ssl/t1_enc.c which were not following the EVP_DigestSignFinal contract; on
entry, *out_len should contain the size of the buffer.

Change-Id: Icd44d97a4c98704dea975798c0101d5a37274d17
Reviewed-on: https://boringssl-review.googlesource.com/1130
Reviewed-by: Adam Langley <agl@google.com>

Converting check_autoarg from a macro to a function lost the behavior. Instead,
just move the logic into p_rsa.c which was the only EVP_PKEY implementation
that even needed the flag.

Also document this behavior on each of the functions. Make note of the out =
NULL case only returning the maximum output size, and not necessarily the
actual size.

For testing, update example_sign to determine the signature size using the NULL
behavior rather than querying the RSA key.

Change-Id: Iec6c2862028a5cfdefe8faa0e8c471755070898a
Reviewed-on: https://boringssl-review.googlesource.com/1121
Reviewed-by: Adam Langley <agl@google.com>

Other importing an EC PRIVATE KEY doesn't work.

Change-Id: I58b4e88d287cd7fc772a1958df5878ecff1c5b06
Reviewed-on: https://boringssl-review.googlesource.com/1090
Reviewed-by: Adam Langley <agl@google.com>

(Imported from upstream's 42d73874ed)

This change adds a new function, BN_bn2bin_padded, that attempts, as
much as possible, to serialise a BIGNUM in constant time.

This is used to avoid some timing leaks in RSA decryption.

This change adds an AEAD interface to EVP and an AES-GCM implementation
suitable for use in TLS.

This change saves several EC routines from crashing when an EC_KEY is
missing a public key. The public key is optional in the EC private key
format and, without this patch, running the following through `openssl
ec` causes a crash:

-----BEGIN EC PRIVATE KEY-----
MBkCAQEECAECAwQFBgcIoAoGCCqGSM49AwEH
-----END EC PRIVATE KEY-----

Initial fork from f2d678e6e8 (1.0.2 beta).

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