(cherry picked from commit 717cc858)

PR#3244

Always add a dynamically loaded ENGINE to list. Otherwise it can cause
problems when multiply loaded, especially if it adds new public key methods.
For all current engines we only want a single implementation anyway.
(cherry picked from commit e933f91f)

Use default instead of ENGINE version of digest. Without this
errors will occur if you use an ENGINE for a private key and
it doesn't implement the digest in question.

PR#3178

(cherry picked from commit 8f4077ca)

PR#3220

The flag SSL_OP_MSIE_SSLV2_RSA_PADDING hasn't done anything since OpenSSL
0.9.7h but deleting it will break source compatibility with any software
that references it. Restore it but #define to zero.
(cherry picked from commit b17d6b8d)

When sending an invalid version number alert don't change the
version number to the client version if a session is already
established.

Thanks to Marek Majkowski for additional analysis of this issue.

PR#3191

(cherry picked from commit 8f686789)

For DTLS we might need to retransmit messages from the previous session
so keep a copy of write context in DTLS retransmission buffers instead
of replacing it after sending CCS. CVE-2013-6450.

When deciding whether to use TLS 1.2 PRF and record hash algorithms
use the version number in the corresponding SSL_METHOD structure
instead of the SSL structure. The SSL structure version is sometimes
inaccurate. Note: OpenSSL 1.0.2 and later effectively do this already.
(CVE-2013-6449)

SHA512_Transform was initially added rather as tribute to tradition
than for practucal reasons. But use was recently found in ssl/s3_cbc.c
and it turned to be problematic on platforms that don't tolerate
misasligned references to memory and lack assembly subroutine.
(cherry picked from commit cdd1acd7)

Partial mitigation of PR#3200

We need to lock when *not* in FIPS mode.
(cherry picked from commit 57c4e42d)

PR: 3176.

In FIPS mode ssleay_rand_bytes is only used for PRNG seeding and is
performed in either a single threaded context (when the PRNG is first
initialised) or under a lock (reseeding). To avoid multiple locks disable
use of CRYPTO_LOCK_RAND in FIPS mode in ssleay_rand_bytes.
(cherry picked from commit 53142f72c9b9c9bad2f39ca6200a4f04f5c8001c)

PR: 3189
Submitted by: Oscar Ciurana
(cherry picked from commit c5d5f5bd)

PR: 3165
Submitted by: Daniel Richard G.
(cherry picked from commit 2df9ec01)
(cherry picked from commit 0de70011)

PR: 3165
(cherry picked from commit 220d1e53)

PR: 3165
(cherry picked from commit d1cf23ac)

(cherry picked from commit 16bc45ba)

(cherry picked from commit 5c50462e)

(cherry picked from commit 60adefa6)

(cherry picked from commit 01be36ef70525e81fc358d2e559bdd0a0d9427a5)

(cherry picked from commit 7040d73d22987532faa503630d6616cf2788c975)

Original definition depended on __LONG_MAX__ that is not guaranteed to
be present. As we don't support platforms with int narrower that 32 bits
it's appropriate to make defition inconditional.

PR: 3165
(cherry picked from commit 96180cac)