CHANGES

     Thanks to Tavis Ormandy, Google Security Team, for discovering this
     issue and to Adam Langley <agl@chromium.org> for fixing it.
     (CVE-2012-2110)
     [Adam Langley (Google), Tavis Ormandy, Google Security Team]

  *) Don't allow TLS 1.2 SHA-256 ciphersuites in TLS 1.0, 1.1 connections.
     [Adam Langley]

  *) Workarounds for some broken servers that "hang" if a client hello
     record length exceeds 255 bytes.

     1. Do not use record version number > TLS 1.0 in initial client
        hello: some (but not all) hanging servers will now work.
     2. If we set OPENSSL_MAX_TLS1_2_CIPHER_LENGTH this will truncate
        the number of ciphers sent in the client hello. This should be
        set to an even number, such as 50, for example by passing:
        -DOPENSSL_MAX_TLS1_2_CIPHER_LENGTH=50 to config or Configure.
        Most broken servers should now work.
     3. If all else fails setting OPENSSL_NO_TLS1_2_CLIENT will disable
        TLS 1.2 client support entirely.
     [Steve Henson]

  *) Fix SEGV in Vector Permutation AES module observed in OpenSSH.
     [Andy Polyakov]

 Changes between 1.0.0h and 1.0.1  [14 Mar 2012]

  *) Add compatibility with old MDC2 signatures which use an ASN1 OCTET
     STRING form instead of a DigestInfo.
     [Steve Henson]

  *) The format used for MDC2 RSA signatures is inconsistent between EVP
     and the RSA_sign/RSA_verify functions. This was made more apparent when
     OpenSSL used RSA_sign/RSA_verify for some RSA signatures in particular
     those which went through EVP_PKEY_METHOD in 1.0.0 and later. Detect
     the correct format in RSA_verify so both forms transparently work.
     [Steve Henson]

  *) Some servers which support TLS 1.0 can choke if we initially indicate
     support for TLS 1.2 and later renegotiate using TLS 1.0 in the RSA
     encrypted premaster secret. As a workaround use the maximum permitted
     client version in client hello, this should keep such servers happy
     and still work with previous versions of OpenSSL.
     [Steve Henson]

  *) Add support for TLS/DTLS heartbeats.
     [Robin Seggelmann <seggelmann@fh-muenster.de>]

  *) Add support for SCTP.
     [Robin Seggelmann <seggelmann@fh-muenster.de>]

  *) Improved PRNG seeding for VOS.
     [Paul Green <Paul.Green@stratus.com>]

  *) Extensive assembler packs updates, most notably:

        - x86[_64]:     AES-NI, PCLMULQDQ, RDRAND support;
        - x86[_64]:     SSSE3 support (SHA1, vector-permutation AES);
        - x86_64:       bit-sliced AES implementation;
        - ARM:          NEON support, contemporary platforms optimizations;
        - s390x:        z196 support;
        - *:            GHASH and GF(2^m) multiplication implementations;

     [Andy Polyakov]

  *) Make TLS-SRP code conformant with RFC 5054 API cleanup
     (removal of unnecessary code)
     [Peter Sylvester <peter.sylvester@edelweb.fr>]

  *) Add TLS key material exporter from RFC 5705.
     [Eric Rescorla]

  *) Add DTLS-SRTP negotiation from RFC 5764.
     [Eric Rescorla]

  *) Add Next Protocol Negotiation,
     http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-00. Can be
     disabled with a no-npn flag to config or Configure. Code donated
     by Google.
     [Adam Langley <agl@google.com> and Ben Laurie]

  *) Add optional 64-bit optimized implementations of elliptic curves NIST-P224,
     NIST-P256, NIST-P521, with constant-time single point multiplication on
     typical inputs. Compiler support for the nonstandard type __uint128_t is
     required to use this (present in gcc 4.4 and later, for 64-bit builds).
     Code made available under Apache License version 2.0.

     Specify "enable-ec_nistp_64_gcc_128" on the Configure (or config) command
     line to include this in your build of OpenSSL, and run "make depend" (or
     "make update"). This enables the following EC_METHODs:

         EC_GFp_nistp224_method()
         EC_GFp_nistp256_method()
         EC_GFp_nistp521_method()

     EC_GROUP_new_by_curve_name() will automatically use these (while
     EC_GROUP_new_curve_GFp() currently prefers the more flexible
     implementations).
     [Emilia Käsper, Adam Langley, Bodo Moeller (Google)]

  *) Use type ossl_ssize_t instad of ssize_t which isn't available on
     all platforms. Move ssize_t definition from e_os.h to the public
     header file e_os2.h as it now appears in public header file cms.h
     [Steve Henson]

  *) New -sigopt option to the ca, req and x509 utilities. Additional
     signature parameters can be passed using this option and in
     particular PSS.
     [Steve Henson]

  *) Add RSA PSS signing function. This will generate and set the
     appropriate AlgorithmIdentifiers for PSS based on those in the
     corresponding EVP_MD_CTX structure. No application support yet.
     [Steve Henson]

  *) Support for companion algorithm specific ASN1 signing routines.
     New function ASN1_item_sign_ctx() signs a pre-initialised
     EVP_MD_CTX structure and sets AlgorithmIdentifiers based on
     the appropriate parameters.
     [Steve Henson]

  *) Add new algorithm specific ASN1 verification initialisation function
     to EVP_PKEY_ASN1_METHOD: this is not in EVP_PKEY_METHOD since the ASN1
     handling will be the same no matter what EVP_PKEY_METHOD is used.
     Add a PSS handler to support verification of PSS signatures: checked
     against a number of sample certificates.
     [Steve Henson]

  *) Add signature printing for PSS. Add PSS OIDs.
     [Steve Henson, Martin Kaiser <lists@kaiser.cx>]

  *) Add algorithm specific signature printing. An individual ASN1 method
     can now print out signatures instead of the standard hex dump.

     More complex signatures (e.g. PSS) can print out more meaningful
     information. Include DSA version that prints out the signature
     parameters r, s.
     [Steve Henson]

  *) Password based recipient info support for CMS library: implementing
     RFC3211.
     [Steve Henson]

  *) Split password based encryption into PBES2 and PBKDF2 functions. This
     neatly separates the code into cipher and PBE sections and is required
     for some algorithms that split PBES2 into separate pieces (such as
     password based CMS).
     [Steve Henson]

  *) Session-handling fixes:
     - Fix handling of connections that are resuming with a session ID,
       but also support Session Tickets.
     - Fix a bug that suppressed issuing of a new ticket if the client
       presented a ticket with an expired session.
     - Try to set the ticket lifetime hint to something reasonable.
     - Make tickets shorter by excluding irrelevant information.
     - On the client side, don't ignore renewed tickets.
     [Adam Langley, Bodo Moeller (Google)]

  *) Fix PSK session representation.
     [Bodo Moeller]

  *) Add RC4-MD5 and AESNI-SHA1 "stitched" implementations.

     This work was sponsored by Intel.
     [Andy Polyakov]

  *) Add GCM support to TLS library. Some custom code is needed to split
     the IV between the fixed (from PRF) and explicit (from TLS record)
     portions. This adds all GCM ciphersuites supported by RFC5288 and
     RFC5289. Generalise some AES* cipherstrings to include GCM and
     add a special AESGCM string for GCM only.
     [Steve Henson]

  *) Expand range of ctrls for AES GCM. Permit setting invocation
     field on decrypt and retrieval of invocation field only on encrypt.
     [Steve Henson]

  *) Add HMAC ECC ciphersuites from RFC5289. Include SHA384 PRF support.
     As required by RFC5289 these ciphersuites cannot be used if for
     versions of TLS earlier than 1.2.
     [Steve Henson]

  *) For FIPS capable OpenSSL interpret a NULL default public key method
     as unset and return the appropriate default but do *not* set the default.
     This means we can return the appropriate method in applications that
     switch between FIPS and non-FIPS modes.
     [Steve Henson]

  *) Redirect HMAC and CMAC operations to FIPS module in FIPS mode. If an
     ENGINE is used then we cannot handle that in the FIPS module so we
     keep original code iff non-FIPS operations are allowed.
     [Steve Henson]

  *) Add -attime option to openssl utilities.
     [Peter Eckersley <pde@eff.org>, Ben Laurie and Steve Henson]

  *) Redirect DSA and DH operations to FIPS module in FIPS mode.
     [Steve Henson]

  *) Redirect ECDSA and ECDH operations to FIPS module in FIPS mode. Also use
     FIPS EC methods unconditionally for now.
     [Steve Henson]

  *) New build option no-ec2m to disable characteristic 2 code.
     [Steve Henson]

  *) Backport libcrypto audit of return value checking from 1.1.0-dev; not
     all cases can be covered as some introduce binary incompatibilities.
     [Steve Henson]

  *) Redirect RSA operations to FIPS module including keygen,
     encrypt, decrypt, sign and verify. Block use of non FIPS RSA methods.
     [Steve Henson]

  *) Add similar low level API blocking to ciphers.
     [Steve Henson]

  *) Low level digest APIs are not approved in FIPS mode: any attempt
     to use these will cause a fatal error. Applications that *really* want
     to use them can use the private_* version instead.
     [Steve Henson]

  *) Redirect cipher operations to FIPS module for FIPS builds.
     [Steve Henson]

  *) Redirect digest operations to FIPS module for FIPS builds.
     [Steve Henson]

  *) Update build system to add "fips" flag which will link in fipscanister.o
     for static and shared library builds embedding a signature if needed.
     [Steve Henson]

  *) Output TLS supported curves in preference order instead of numerical
     order. This is currently hardcoded for the highest order curves first.
     This should be configurable so applications can judge speed vs strength.
     [Steve Henson]

  *) Add TLS v1.2 server support for client authentication.
     [Steve Henson]

  *) Add support for FIPS mode in ssl library: disable SSLv3, non-FIPS ciphers
     and enable MD5.
     [Steve Henson]

  *) Functions FIPS_mode_set() and FIPS_mode() which call the underlying
     FIPS modules versions.
     [Steve Henson]

  *) Add TLS v1.2 client side support for client authentication. Keep cache
     of handshake records longer as we don't know the hash algorithm to use
     until after the certificate request message is received.
     [Steve Henson]

  *) Initial TLS v1.2 client support. Add a default signature algorithms
     extension including all the algorithms we support. Parse new signature
     format in client key exchange. Relax some ECC signing restrictions for
     TLS v1.2 as indicated in RFC5246.
     [Steve Henson]

  *) Add server support for TLS v1.2 signature algorithms extension. Switch
     to new signature format when needed using client digest preference.
     All server ciphersuites should now work correctly in TLS v1.2. No client
     support yet and no support for client certificates.
     [Steve Henson]

  *) Initial TLS v1.2 support. Add new SHA256 digest to ssl code, switch
     to SHA256 for PRF when using TLS v1.2 and later. Add new SHA256 based
     ciphersuites. At present only RSA key exchange ciphersuites work with
     TLS v1.2. Add new option for TLS v1.2 replacing the old and obsolete
     SSL_OP_PKCS1_CHECK flags with SSL_OP_NO_TLSv1_2. New TLSv1.2 methods
     and version checking.
     [Steve Henson]

  *) New option OPENSSL_NO_SSL_INTERN. If an application can be compiled
     with this defined it will not be affected by any changes to ssl internal
     structures. Add several utility functions to allow openssl application
     to work with OPENSSL_NO_SSL_INTERN defined.
     [Steve Henson]

  *) A long standing patch to add support for SRP from EdelWeb (Peter
     Sylvester and Christophe Renou) was integrated.
     [Christophe Renou <christophe.renou@edelweb.fr>, Peter Sylvester
     <peter.sylvester@edelweb.fr>, Tom Wu <tjw@cs.stanford.edu>, and
     Ben Laurie]

  *) Add functions to copy EVP_PKEY_METHOD and retrieve flags and id.
     [Steve Henson]

  *) Permit abbreviated handshakes when renegotiating using the function
     SSL_renegotiate_abbreviated().
     [Robin Seggelmann <seggelmann@fh-muenster.de>]

  *) Add call to ENGINE_register_all_complete() to
     ENGINE_load_builtin_engines(), so some implementations get used
     automatically instead of needing explicit application support.
     [Steve Henson]

  *) Add support for TLS key exporter as described in RFC5705.
     [Robin Seggelmann <seggelmann@fh-muenster.de>, Steve Henson]

  *) Initial TLSv1.1 support. Since TLSv1.1 is very similar to TLS v1.0 only
     a few changes are required:

       Add SSL_OP_NO_TLSv1_1 flag.
       Add TLSv1_1 methods.
       Update version checking logic to handle version 1.1.
       Add explicit IV handling (ported from DTLS code).
       Add command line options to s_client/s_server.
     [Steve Henson]

 Changes between 1.0.0g and 1.0.0h [12 Mar 2012]

  *) Fix MMA (Bleichenbacher's attack on PKCS #1 v1.5 RSA padding) weakness
     in CMS and PKCS7 code. When RSA decryption fails use a random key for
     content decryption and always return the same error. Note: this attack
     needs on average 2^20 messages so it only affects automated senders. The
     old behaviour can be re-enabled in the CMS code by setting the
     CMS_DEBUG_DECRYPT flag: this is useful for debugging and testing where
     an MMA defence is not necessary.
     Thanks to Ivan Nestlerode <inestlerode@us.ibm.com> for discovering
     this issue. (CVE-2012-0884)
     [Steve Henson]

  *) Fix CVE-2011-4619: make sure we really are receiving a
     client hello before rejecting multiple SGC restarts. Thanks to
     Ivan Nestlerode <inestlerode@us.ibm.com> for discovering this bug.
     [Steve Henson]

 Changes between 1.0.0f and 1.0.0g [18 Jan 2012]

  *) Fix for DTLS DoS issue introduced by fix for CVE-2011-4109.
     Thanks to Antonio Martin, Enterprise Secure Access Research and
     Development, Cisco Systems, Inc. for discovering this bug and
     preparing a fix. (CVE-2012-0050)
     [Antonio Martin]

 Changes between 1.0.0e and 1.0.0f [4 Jan 2012]

  *) Nadhem Alfardan and Kenny Paterson have discovered an extension
     of the Vaudenay padding oracle attack on CBC mode encryption
     which enables an efficient plaintext recovery attack against
     the OpenSSL implementation of DTLS. Their attack exploits timing
     differences arising during decryption processing. A research
     paper describing this attack can be found at:
                  http://www.isg.rhul.ac.uk/~kp/dtls.pdf
     Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
     Security Group at Royal Holloway, University of London
     (www.isg.rhul.ac.uk) for discovering this flaw and to Robin Seggelmann
     <seggelmann@fh-muenster.de> and Michael Tuexen <tuexen@fh-muenster.de>
     for preparing the fix. (CVE-2011-4108)
     [Robin Seggelmann, Michael Tuexen]

  *) Clear bytes used for block padding of SSL 3.0 records.
     (CVE-2011-4576)
     [Adam Langley (Google)]

  *) Only allow one SGC handshake restart for SSL/TLS. Thanks to George
     Kadianakis <desnacked@gmail.com> for discovering this issue and
     Adam Langley for preparing the fix. (CVE-2011-4619)
     [Adam Langley (Google)]

  *) Check parameters are not NULL in GOST ENGINE. (CVE-2012-0027)
     [Andrey Kulikov <amdeich@gmail.com>]

  *) Prevent malformed RFC3779 data triggering an assertion failure.
     Thanks to Andrew Chi, BBN Technologies, for discovering the flaw
     and Rob Austein <sra@hactrn.net> for fixing it. (CVE-2011-4577)
     [Rob Austein <sra@hactrn.net>]

  *) Improved PRNG seeding for VOS.
     [Paul Green <Paul.Green@stratus.com>]

  *) Fix ssl_ciph.c set-up race.
     [Adam Langley (Google)]

  *) Fix spurious failures in ecdsatest.c.
     [Emilia Käsper (Google)]

  *) Fix the BIO_f_buffer() implementation (which was mixing different
     interpretations of the '..._len' fields).
     [Adam Langley (Google)]

  *) Fix handling of BN_BLINDING: now BN_BLINDING_invert_ex (rather than
     BN_BLINDING_invert_ex) calls BN_BLINDING_update, ensuring that concurrent
     threads won't reuse the same blinding coefficients.

     This also avoids the need to obtain the CRYPTO_LOCK_RSA_BLINDING
     lock to call BN_BLINDING_invert_ex, and avoids one use of
     BN_BLINDING_update for each BN_BLINDING structure (previously,
     the last update always remained unused).
     [Emilia Käsper (Google)]

  *) In ssl3_clear, preserve s3->init_extra along with s3->rbuf.
     [Bob Buckholz (Google)]

 Changes between 1.0.0d and 1.0.0e [6 Sep 2011]

  *) Fix bug where CRLs with nextUpdate in the past are sometimes accepted
     by initialising X509_STORE_CTX properly. (CVE-2011-3207)
     [Kaspar Brand <ossl@velox.ch>]

  *) Fix SSL memory handling for (EC)DH ciphersuites, in particular
     for multi-threaded use of ECDH. (CVE-2011-3210)
     [Adam Langley (Google)]

  *) Fix x509_name_ex_d2i memory leak on bad inputs.
     [Bodo Moeller]

  *) Remove hard coded ecdsaWithSHA1 signature tests in ssl code and check
     signature public key algorithm by using OID xref utilities instead.
     Before this you could only use some ECC ciphersuites with SHA1 only.
     [Steve Henson]

  *) Add protection against ECDSA timing attacks as mentioned in the paper
     by Billy Bob Brumley and Nicola Tuveri, see:

        http://eprint.iacr.org/2011/232.pdf

     [Billy Bob Brumley and Nicola Tuveri]

 Changes between 1.0.0c and 1.0.0d [8 Feb 2011]

  *) Fix parsing of OCSP stapling ClientHello extension. CVE-2011-0014
     [Neel Mehta, Adam Langley, Bodo Moeller (Google)]

  *) Fix bug in string printing code: if *any* escaping is enabled we must
     escape the escape character (backslash) or the resulting string is
     ambiguous.
     [Steve Henson]

 Changes between 1.0.0b and 1.0.0c  [2 Dec 2010]

  *) Disable code workaround for ancient and obsolete Netscape browsers
     and servers: an attacker can use it in a ciphersuite downgrade attack.
     Thanks to Martin Rex for discovering this bug. CVE-2010-4180
     [Steve Henson]

  *) Fixed J-PAKE implementation error, originally discovered by
     Sebastien Martini, further info and confirmation from Stefan
     Arentz and Feng Hao. Note that this fix is a security fix. CVE-2010-4252
     [Ben Laurie]

 Changes between 1.0.0a and 1.0.0b  [16 Nov 2010]

  *) Fix extension code to avoid race conditions which can result in a buffer
     overrun vulnerability: resumed sessions must not be modified as they can
     be shared by multiple threads. CVE-2010-3864
     [Steve Henson]

  *) Fix WIN32 build system to correctly link an ENGINE directory into
     a DLL.
     [Steve Henson]

 Changes between 1.0.0 and 1.0.0a  [01 Jun 2010]

  *) Check return value of int_rsa_verify in pkey_rsa_verifyrecover
     (CVE-2010-1633)
     [Steve Henson, Peter-Michael Hager <hager@dortmund.net>]

 Changes between 0.9.8n and 1.0.0  [29 Mar 2010]

  *) Add "missing" function EVP_CIPHER_CTX_copy(). This copies a cipher
     context. The operation can be customised via the ctrl mechanism in
     case ENGINEs want to include additional functionality.
     [Steve Henson]

  *) Tolerate yet another broken PKCS#8 key format: private key value negative.
     [Steve Henson]

  *) Add new -subject_hash_old and -issuer_hash_old options to x509 utility to
     output hashes compatible with older versions of OpenSSL.
     [Willy Weisz <weisz@vcpc.univie.ac.at>]

  *) Fix compression algorithm handling: if resuming a session use the
     compression algorithm of the resumed session instead of determining
     it from client hello again. Don't allow server to change algorithm.
     [Steve Henson]

  *) Add load_crls() function to apps tidying load_certs() too. Add option
     to verify utility to allow additional CRLs to be included.
     [Steve Henson]

  *) Update OCSP request code to permit adding custom headers to the request:
     some responders need this.
     [Steve Henson]

  *) The function EVP_PKEY_sign() returns <=0 on error: check return code
     correctly.
     [Julia Lawall <julia@diku.dk>]

  *) Update verify callback code in apps/s_cb.c and apps/verify.c, it
     needlessly dereferenced structures, used obsolete functions and
     didn't handle all updated verify codes correctly.
     [Steve Henson]

  *) Disable MD2 in the default configuration.
     [Steve Henson]

  *) In BIO_pop() and BIO_push() use the ctrl argument (which was NULL) to
     indicate the initial BIO being pushed or popped. This makes it possible
     to determine whether the BIO is the one explicitly called or as a result
     of the ctrl being passed down the chain. Fix BIO_pop() and SSL BIOs so
     it handles reference counts correctly and doesn't zero out the I/O bio
     when it is not being explicitly popped. WARNING: applications which
     included workarounds for the old buggy behaviour will need to be modified
     or they could free up already freed BIOs.
     [Steve Henson]

  *) Extend the uni2asc/asc2uni => OPENSSL_uni2asc/OPENSSL_asc2uni
     renaming to all platforms (within the 0.9.8 branch, this was
     done conditionally on Netware platforms to avoid a name clash).
     [Guenter <lists@gknw.net>]

  *) Add ECDHE and PSK support to DTLS.
     [Michael Tuexen <tuexen@fh-muenster.de>]

  *) Add CHECKED_STACK_OF macro to safestack.h, otherwise safestack can't
     be used on C++.
     [Steve Henson]

  *) Add "missing" function EVP_MD_flags() (without this the only way to
     retrieve a digest flags is by accessing the structure directly. Update
     EVP_MD_do_all*() and EVP_CIPHER_do_all*() to include the name a digest
     or cipher is registered as in the "from" argument. Print out all
     registered digests in the dgst usage message instead of manually
     attempting to work them out.
     [Steve Henson]

  *) If no SSLv2 ciphers are used don't use an SSLv2 compatible client hello:
     this allows the use of compression and extensions. Change default cipher
     string to remove SSLv2 ciphersuites. This effectively avoids ancient SSLv2
     by default unless an application cipher string requests it.
     [Steve Henson]

  *) Alter match criteria in PKCS12_parse(). It used to try to use local
     key ids to find matching certificates and keys but some PKCS#12 files
     don't follow the (somewhat unwritten) rules and this strategy fails.
     Now just gather all certificates together and the first private key
     then look for the first certificate that matches the key.
     [Steve Henson]

  *) Support use of registered digest and cipher names for dgst and cipher
     commands instead of having to add each one as a special case. So now
     you can do:

        openssl sha256 foo

     as well as:

        openssl dgst -sha256 foo

     and this works for ENGINE based algorithms too.

     [Steve Henson]

  *) Update Gost ENGINE to support parameter files.
     [Victor B. Wagner <vitus@cryptocom.ru>]

  *) Support GeneralizedTime in ca utility.
     [Oliver Martin <oliver@volatilevoid.net>, Steve Henson]

  *) Enhance the hash format used for certificate directory links. The new
     form uses the canonical encoding (meaning equivalent names will work
     even if they aren't identical) and uses SHA1 instead of MD5. This form
     is incompatible with the older format and as a result c_rehash should
     be used to rebuild symbolic links.
     [Steve Henson]

  *) Make PKCS#8 the default write format for private keys, replacing the
     traditional format. This form is standardised, more secure and doesn't
     include an implicit MD5 dependency.
     [Steve Henson]

  *) Add a $gcc_devteam_warn option to Configure. The idea is that any code
     committed to OpenSSL should pass this lot as a minimum.
     [Steve Henson]

  *) Add session ticket override functionality for use by EAP-FAST.
     [Jouni Malinen <j@w1.fi>]

  *) Modify HMAC functions to return a value. Since these can be implemented
     in an ENGINE errors can occur.
     [Steve Henson]

  *) Type-checked OBJ_bsearch_ex.
     [Ben Laurie]

  *) Type-checked OBJ_bsearch. Also some constification necessitated
     by type-checking.  Still to come: TXT_DB, bsearch(?),
     OBJ_bsearch_ex, qsort, CRYPTO_EX_DATA, ASN1_VALUE, ASN1_STRING,
     CONF_VALUE.
     [Ben Laurie]

  *) New function OPENSSL_gmtime_adj() to add a specific number of days and
     seconds to a tm structure directly, instead of going through OS
     specific date routines. This avoids any issues with OS routines such
     as the year 2038 bug. New *_adj() functions for ASN1 time structures
     and X509_time_adj_ex() to cover the extended range. The existing
     X509_time_adj() is still usable and will no longer have any date issues.
     [Steve Henson]

  *) Delta CRL support. New use deltas option which will attempt to locate
     and search any appropriate delta CRLs available.

     This work was sponsored by Google.
     [Steve Henson]

  *) Support for CRLs partitioned by reason code. Reorganise CRL processing
     code and add additional score elements. Validate alternate CRL paths
     as part of the CRL checking and indicate a new error "CRL path validation
     error" in this case. Applications wanting additional details can use
     the verify callback and check the new "parent" field. If this is not
     NULL CRL path validation is taking place. Existing applications won't
     see this because it requires extended CRL support which is off by
     default.

     This work was sponsored by Google.
     [Steve Henson]

  *) Support for freshest CRL extension.

     This work was sponsored by Google.
     [Steve Henson]

  *) Initial indirect CRL support. Currently only supported in the CRLs
     passed directly and not via lookup. Process certificate issuer
     CRL entry extension and lookup CRL entries by bother issuer name
     and serial number. Check and process CRL issuer entry in IDP extension.

     This work was sponsored by Google.
     [Steve Henson]

  *) Add support for distinct certificate and CRL paths. The CRL issuer
     certificate is validated separately in this case. Only enabled if
     an extended CRL support flag is set: this flag will enable additional
     CRL functionality in future.

     This work was sponsored by Google.
     [Steve Henson]

  *) Add support for policy mappings extension.

     This work was sponsored by Google.
     [Steve Henson]

  *) Fixes to pathlength constraint, self issued certificate handling,
     policy processing to align with RFC3280 and PKITS tests.

     This work was sponsored by Google.
     [Steve Henson]

  *) Support for name constraints certificate extension. DN, email, DNS
     and URI types are currently supported.

     This work was sponsored by Google.
     [Steve Henson]

  *) To cater for systems that provide a pointer-based thread ID rather
     than numeric, deprecate the current numeric thread ID mechanism and
     replace it with a structure and associated callback type. This
     mechanism allows a numeric "hash" to be extracted from a thread ID in
     either case, and on platforms where pointers are larger than 'long',
     mixing is done to help ensure the numeric 'hash' is usable even if it
     can't be guaranteed unique. The default mechanism is to use "&errno"
     as a pointer-based thread ID to distinguish between threads.

     Applications that want to provide their own thread IDs should now use
     CRYPTO_THREADID_set_callback() to register a callback that will call
     either CRYPTO_THREADID_set_numeric() or CRYPTO_THREADID_set_pointer().

     Note that ERR_remove_state() is now deprecated, because it is tied
     to the assumption that thread IDs are numeric.  ERR_remove_state(0)
     to free the current thread's error state should be replaced by
     ERR_remove_thread_state(NULL).

     (This new approach replaces the functions CRYPTO_set_idptr_callback(),
     CRYPTO_get_idptr_callback(), and CRYPTO_thread_idptr() that existed in
     OpenSSL 0.9.9-dev between June 2006 and August 2008. Also, if an
     application was previously providing a numeric thread callback that
     was inappropriate for distinguishing threads, then uniqueness might
     have been obtained with &errno that happened immediately in the
     intermediate development versions of OpenSSL; this is no longer the
     case, the numeric thread callback will now override the automatic use
     of &errno.)
     [Geoff Thorpe, with help from Bodo Moeller]

  *) Initial support for different CRL issuing certificates. This covers a
     simple case where the self issued certificates in the chain exist and
     the real CRL issuer is higher in the existing chain.

     This work was sponsored by Google.
     [Steve Henson]

  *) Removed effectively defunct crypto/store from the build.
     [Ben Laurie]

  *) Revamp of STACK to provide stronger type-checking. Still to come:
     TXT_DB, bsearch(?), OBJ_bsearch, qsort, CRYPTO_EX_DATA, ASN1_VALUE,
     ASN1_STRING, CONF_VALUE.
     [Ben Laurie]

  *) Add a new SSL_MODE_RELEASE_BUFFERS mode flag to release unused buffer
     RAM on SSL connections.  This option can save about 34k per idle SSL.
     [Nick Mathewson]

  *) Revamp of LHASH to provide stronger type-checking. Still to come:
     STACK, TXT_DB, bsearch, qsort.
     [Ben Laurie]

  *) Initial support for Cryptographic Message Syntax (aka CMS) based
     on RFC3850, RFC3851 and RFC3852. New cms directory and cms utility,
     support for data, signedData, compressedData, digestedData and
     encryptedData, envelopedData types included. Scripts to check against
     RFC4134 examples draft and interop and consistency checks of many
     content types and variants.
     [Steve Henson]

  *) Add options to enc utility to support use of zlib compression BIO.
     [Steve Henson]

  *) Extend mk1mf to support importing of options and assembly language
     files from Configure script, currently only included in VC-WIN32.
     The assembly language rules can now optionally generate the source
     files from the associated perl scripts.
     [Steve Henson]

  *) Implement remaining functionality needed to support GOST ciphersuites.
     Interop testing has been performed using CryptoPro implementations.
     [Victor B. Wagner <vitus@cryptocom.ru>]

  *) s390x assembler pack.
     [Andy Polyakov]

  *) ARMv4 assembler pack. ARMv4 refers to v4 and later ISA, not CPU
     "family."
     [Andy Polyakov]

  *) Implement Opaque PRF Input TLS extension as specified in
     draft-rescorla-tls-opaque-prf-input-00.txt.  Since this is not an
     official specification yet and no extension type assignment by
     IANA exists, this extension (for now) will have to be explicitly
     enabled when building OpenSSL by providing the extension number
     to use.  For example, specify an option

         -DTLSEXT_TYPE_opaque_prf_input=0x9527

     to the "config" or "Configure" script to enable the extension,
     assuming extension number 0x9527 (which is a completely arbitrary
     and unofficial assignment based on the MD5 hash of the Internet
     Draft).  Note that by doing so, you potentially lose
     interoperability with other TLS implementations since these might
     be using the same extension number for other purposes.

     SSL_set_tlsext_opaque_prf_input(ssl, src, len) is used to set the
     opaque PRF input value to use in the handshake.  This will create
     an internal copy of the length-'len' string at 'src', and will
     return non-zero for success.

     To get more control and flexibility, provide a callback function
     by using

          SSL_CTX_set_tlsext_opaque_prf_input_callback(ctx, cb)
          SSL_CTX_set_tlsext_opaque_prf_input_callback_arg(ctx, arg)

     where

          int (*cb)(SSL *, void *peerinput, size_t len, void *arg);
          void *arg;

     Callback function 'cb' will be called in handshakes, and is
     expected to use SSL_set_tlsext_opaque_prf_input() as appropriate.
     Argument 'arg' is for application purposes (the value as given to
     SSL_CTX_set_tlsext_opaque_prf_input_callback_arg() will directly
     be provided to the callback function).  The callback function
     has to return non-zero to report success: usually 1 to use opaque
     PRF input just if possible, or 2 to enforce use of the opaque PRF
     input.  In the latter case, the library will abort the handshake
     if opaque PRF input is not successfully negotiated.

     Arguments 'peerinput' and 'len' given to the callback function
     will always be NULL and 0 in the case of a client.  A server will
     see the client's opaque PRF input through these variables if
     available (NULL and 0 otherwise).  Note that if the server
     provides an opaque PRF input, the length must be the same as the
     length of the client's opaque PRF input.

     Note that the callback function will only be called when creating
     a new session (session resumption can resume whatever was
     previously negotiated), and will not be called in SSL 2.0
     handshakes; thus, SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) or
     SSL_set_options(ssl, SSL_OP_NO_SSLv2) is especially recommended
     for applications that need to enforce opaque PRF input.

     [Bodo Moeller]

  *) Update ssl code to support digests other than SHA1+MD5 for handshake
     MAC.

     [Victor B. Wagner <vitus@cryptocom.ru>]

  *) Add RFC4507 support to OpenSSL. This includes the corrections in
     RFC4507bis. The encrypted ticket format is an encrypted encoded
     SSL_SESSION structure, that way new session features are automatically
     supported.

     If a client application caches session in an SSL_SESSION structure
     support is transparent because tickets are now stored in the encoded
     SSL_SESSION.

     The SSL_CTX structure automatically generates keys for ticket
     protection in servers so again support should be possible
     with no application modification.

     If a client or server wishes to disable RFC4507 support then the option
     SSL_OP_NO_TICKET can be set.

     Add a TLS extension debugging callback to allow the contents of any client
     or server extensions to be examined.

     This work was sponsored by Google.
     [Steve Henson]

  *) Final changes to avoid use of pointer pointer casts in OpenSSL.
     OpenSSL should now compile cleanly on gcc 4.2
     [Peter Hartley <pdh@utter.chaos.org.uk>, Steve Henson]

  *) Update SSL library to use new EVP_PKEY MAC API. Include generic MAC
     support including streaming MAC support: this is required for GOST
     ciphersuite support.
     [Victor B. Wagner <vitus@cryptocom.ru>, Steve Henson]

  *) Add option -stream to use PKCS#7 streaming in smime utility. New
     function i2d_PKCS7_bio_stream() and PEM_write_PKCS7_bio_stream()
     to output in BER and PEM format.
     [Steve Henson]

  *) Experimental support for use of HMAC via EVP_PKEY interface. This
     allows HMAC to be handled via the EVP_DigestSign*() interface. The
     EVP_PKEY "key" in this case is the HMAC key, potentially allowing
     ENGINE support for HMAC keys which are unextractable. New -mac and
     -macopt options to dgst utility.
     [Steve Henson]

  *) New option -sigopt to dgst utility. Update dgst to use
     EVP_Digest{Sign,Verify}*. These two changes make it possible to use
     alternative signing parameters such as X9.31 or PSS in the dgst
     utility.
     [Steve Henson]

  *) Change ssl_cipher_apply_rule(), the internal function that does
     the work each time a ciphersuite string requests enabling
     ("foo+bar"), moving ("+foo+bar"), disabling ("-foo+bar", or
     removing ("!foo+bar") a class of ciphersuites: Now it maintains
     the order of disabled ciphersuites such that those ciphersuites
     that most recently went from enabled to disabled not only stay
     in order with respect to each other, but also have higher priority
     than other disabled ciphersuites the next time ciphersuites are
     enabled again.

     This means that you can now say, e.g., "PSK:-PSK:HIGH" to enable
     the same ciphersuites as with "HIGH" alone, but in a specific
     order where the PSK ciphersuites come first (since they are the
     most recently disabled ciphersuites when "HIGH" is parsed).

     Also, change ssl_create_cipher_list() (using this new
     functionality) such that between otherwise identical
     ciphersuites, ephemeral ECDH is preferred over ephemeral DH in
     the default order.
     [Bodo Moeller]

  *) Change ssl_create_cipher_list() so that it automatically
     arranges the ciphersuites in reasonable order before starting
     to process the rule string.  Thus, the definition for "DEFAULT"
     (SSL_DEFAULT_CIPHER_LIST) now is just "ALL:!aNULL:!eNULL", but
     remains equivalent to "AES:ALL:!aNULL:!eNULL:+aECDH:+kRSA:+RC4:@STRENGTH".
     This makes it much easier to arrive at a reasonable default order
     in applications for which anonymous ciphers are OK (meaning
     that you can't actually use DEFAULT).
     [Bodo Moeller; suggested by Victor Duchovni]

  *) Split the SSL/TLS algorithm mask (as used for ciphersuite string
     processing) into multiple integers instead of setting
     "SSL_MKEY_MASK" bits, "SSL_AUTH_MASK" bits, "SSL_ENC_MASK",
     "SSL_MAC_MASK", and "SSL_SSL_MASK" bits all in a single integer.
     (These masks as well as the individual bit definitions are hidden
     away into the non-exported interface ssl/ssl_locl.h, so this
     change to the definition of the SSL_CIPHER structure shouldn't
     affect applications.)  This give us more bits for each of these
     categories, so there is no longer a need to coagulate AES128 and
     AES256 into a single algorithm bit, and to coagulate Camellia128
     and Camellia256 into a single algorithm bit, which has led to all
     kinds of kludges.

     Thus, among other things, the kludge introduced in 0.9.7m and
     0.9.8e for masking out AES256 independently of AES128 or masking
     out Camellia256 independently of AES256 is not needed here in 0.9.9.

     With the change, we also introduce new ciphersuite aliases that
     so far were missing: "AES128", "AES256", "CAMELLIA128", and
     "CAMELLIA256".
     [Bodo Moeller]

  *) Add support for dsa-with-SHA224 and dsa-with-SHA256.
     Use the leftmost N bytes of the signature input if the input is
     larger than the prime q (with N being the size in bytes of q).
     [Nils Larsch]

  *) Very *very* experimental PKCS#7 streaming encoder support. Nothing uses
     it yet and it is largely untested.
     [Steve Henson]

  *) Add support for the ecdsa-with-SHA224/256/384/512 signature types.
     [Nils Larsch]

  *) Initial incomplete changes to avoid need for function casts in OpenSSL
     some compilers (gcc 4.2 and later) reject their use. Safestack is
     reimplemented.  Update ASN1 to avoid use of legacy functions.
     [Steve Henson]

  *) Win32/64 targets are linked with Winsock2.
     [Andy Polyakov]

  *) Add an X509_CRL_METHOD structure to allow CRL processing to be redirected
     to external functions. This can be used to increase CRL handling
     efficiency especially when CRLs are very large by (for example) storing
     the CRL revoked certificates in a database.
     [Steve Henson]

  *) Overhaul of by_dir code. Add support for dynamic loading of CRLs so
     new CRLs added to a directory can be used. New command line option
     -verify_return_error to s_client and s_server. This causes real errors
     to be returned by the verify callback instead of carrying on no matter
     what. This reflects the way a "real world" verify callback would behave.
     [Steve Henson]

  *) GOST engine, supporting several GOST algorithms and public key formats.
     Kindly donated by Cryptocom.
     [Cryptocom]

  *) Partial support for Issuing Distribution Point CRL extension. CRLs
     partitioned by DP are handled but no indirect CRL or reason partitioning
     (yet). Complete overhaul of CRL handling: now the most suitable CRL is
     selected via a scoring technique which handles IDP and AKID in CRLs.
     [Steve Henson]

  *) New X509_STORE_CTX callbacks lookup_crls() and lookup_certs() which
     will ultimately be used for all verify operations: this will remove the
     X509_STORE dependency on certificate verification and allow alternative
     lookup methods.  X509_STORE based implementations of these two callbacks.
     [Steve Henson]

  *) Allow multiple CRLs to exist in an X509_STORE with matching issuer names.
     Modify get_crl() to find a valid (unexpired) CRL if possible.
     [Steve Henson]

  *) New function X509_CRL_match() to check if two CRLs are identical. Normally
     this would be called X509_CRL_cmp() but that name is already used by
     a function that just compares CRL issuer names. Cache several CRL
     extensions in X509_CRL structure and cache CRLDP in X509.
     [Steve Henson]

  *) Store a "canonical" representation of X509_NAME structure (ASN1 Name)
     this maps equivalent X509_NAME structures into a consistent structure.
     Name comparison can then be performed rapidly using memcmp().
     [Steve Henson]

  *) Non-blocking OCSP request processing. Add -timeout option to ocsp
     utility.
     [Steve Henson]

  *) Allow digests to supply their own micalg string for S/MIME type using
     the ctrl EVP_MD_CTRL_MICALG.
     [Steve Henson]

  *) During PKCS7 signing pass the PKCS7 SignerInfo structure to the
     EVP_PKEY_METHOD before and after signing via the EVP_PKEY_CTRL_PKCS7_SIGN
     ctrl. It can then customise the structure before and/or after signing
     if necessary.
     [Steve Henson]

  *) New function OBJ_add_sigid() to allow application defined signature OIDs
     to be added to OpenSSLs internal tables. New function OBJ_sigid_free()
     to free up any added signature OIDs.
     [Steve Henson]

  *) New functions EVP_CIPHER_do_all(), EVP_CIPHER_do_all_sorted(),
     EVP_MD_do_all() and EVP_MD_do_all_sorted() to enumerate internal
     digest and cipher tables. New options added to openssl utility:
     list-message-digest-algorithms and list-cipher-algorithms.
     [Steve Henson]

  *) Change the array representation of binary polynomials: the list
     of degrees of non-zero coefficients is now terminated with -1.
     Previously it was terminated with 0, which was also part of the
     value; thus, the array representation was not applicable to
     polynomials where t^0 has coefficient zero.  This change makes
     the array representation useful in a more general context.
     [Douglas Stebila]