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)

PR: 3165
(cherry picked from commit d24d1d7d)

Enable PSK ciphersuites with AES or DES3 in FIPS mode.
(cherry picked from commit e0ffd129)

(cherry picked from commit a4947e4e)

<christian@python.org>.

PR: 2808

With DTLS/SCTP the SCTP extension SCTP-AUTH is used to protect DATA and
FORWARD-TSN chunks. The key for this extension is derived from the
master secret and changed with the next ChangeCipherSpec, whenever a new
key has been negotiated. The following Finished then already uses the
new key.  Unfortunately, the ChangeCipherSpec and Finished are part of
the same flight as the ClientKeyExchange, which is necessary for the
computation of the new secret. Hence, these messages are sent
immediately following each other, leaving the server very little time to
compute the new secret and pass it to SCTP before the finished arrives.
So the Finished is likely to be discarded by SCTP and a retransmission
becomes necessary. To prevent this issue, the Finished of the client is
still sent with the old key.
(cherry picked from commit 9fb523ad)
(cherry picked from commit b9ef52b0)

PR: 2809

DTLS/SCTP requires DATA and FORWARD-TSN chunks to be protected with
SCTP-AUTH.  It is checked if this has been activated successfully for
the local and remote peer. Due to a bug, however, the
gauth_number_of_chunks field of the authchunks struct is missing on
FreeBSD, and was therefore not considered in the OpenSSL implementation.
This patch sets the corresponding pointer for the check correctly
whether or not this bug is present.
(cherry picked from commit f596e3c4)
(cherry picked from commit b8140811)

Since the TLS 1.2 supported signature algorithms extension is less
sophisticaed in OpenSSL 1.0.1 this has to be done in two stages.

RSA+MD5 is removed from supported signature algorithms extension:
any compliant implementation should never use RSA+MD5 as a result.

To cover the case of a broken implementation using RSA+MD5 anyway
disable lookup of MD5 algorithm in TLS 1.2.

Latest MIPS ISA specification declared 'branch likely' instructions
obsolete. To makes code future-proof replace them with equivalent.
(cherry picked from commit 0c2adb0a)

Performance improvement and Windows-specific bugfix (PR#3139).
(cherry picked from commit 9ed6fba2)