CHANGES

     MGF1 digest and OAEP label.
     [Steve Henson]

  *) Add EVP support for key wrapping algorithms, to avoid problems with
     existing code the flag EVP_CIPHER_CTX_WRAP_ALLOW has to be set in
     the EVP_CIPHER_CTX or an error is returned. Add AES and DES3 wrap
     algorithms and include tests cases.
     [Steve Henson]

  *) Add functions to allocate and set the fields of an ECDSA_METHOD
     structure.
     [Douglas E. Engert, Steve Henson]

  *) New functions OPENSSL_gmtime_diff and ASN1_TIME_diff to find the
     difference in days and seconds between two tm or ASN1_TIME structures.
     [Steve Henson]

  *) Add -rev test option to s_server to just reverse order of characters
     received by client and send back to server. Also prints an abbreviated
     summary of the connection parameters.
     [Steve Henson]

  *) New option -brief for s_client and s_server to print out a brief summary
     of connection parameters.
     [Steve Henson]

  *) Add callbacks for arbitrary TLS extensions.
     [Trevor Perrin <trevp@trevp.net> and Ben Laurie]

  *) New option -crl_download in several openssl utilities to download CRLs
     from CRLDP extension in certificates.
     [Steve Henson]

  *) New options -CRL and -CRLform for s_client and s_server for CRLs.
     [Steve Henson]

  *) New function X509_CRL_diff to generate a delta CRL from the difference
     of two full CRLs. Add support to "crl" utility.
     [Steve Henson]

  *) New functions to set lookup_crls function and to retrieve
     X509_STORE from X509_STORE_CTX.
     [Steve Henson]

  *) Print out deprecated issuer and subject unique ID fields in
     certificates.
     [Steve Henson]

  *) Extend OCSP I/O functions so they can be used for simple general purpose
     HTTP as well as OCSP. New wrapper function which can be used to download
     CRLs using the OCSP API.
     [Steve Henson]

  *) Delegate command line handling in s_client/s_server to SSL_CONF APIs.
     [Steve Henson]

  *) SSL_CONF* functions. These provide a common framework for application
     configuration using configuration files or command lines.
     [Steve Henson]

  *) SSL/TLS tracing code. This parses out SSL/TLS records using the
     message callback and prints the results. Needs compile time option
     "enable-ssl-trace". New options to s_client and s_server to enable
     tracing.
     [Steve Henson]

  *) New ctrl and macro to retrieve supported points extensions.
     Print out extension in s_server and s_client.
     [Steve Henson]

  *) New functions to retrieve certificate signature and signature
     OID NID.
     [Steve Henson]

  *) Add functions to retrieve and manipulate the raw cipherlist sent by a
     client to OpenSSL.
     [Steve Henson]

  *) New Suite B modes for TLS code. These use and enforce the requirements
     of RFC6460: restrict ciphersuites, only permit Suite B algorithms and
     only use Suite B curves. The Suite B modes can be set by using the
     strings "SUITEB128", "SUITEB192" or "SUITEB128ONLY" for the cipherstring.
     [Steve Henson]

  *) New chain verification flags for Suite B levels of security. Check
     algorithms are acceptable when flags are set in X509_verify_cert.
     [Steve Henson]

  *) Make tls1_check_chain return a set of flags indicating checks passed
     by a certificate chain. Add additional tests to handle client
     certificates: checks for matching certificate type and issuer name
     comparison.
     [Steve Henson]

  *) If an attempt is made to use a signature algorithm not in the peer
     preference list abort the handshake. If client has no suitable
     signature algorithms in response to a certificate request do not
     use the certificate.
     [Steve Henson]

  *) If server EC tmp key is not in client preference list abort handshake.
     [Steve Henson]

  *) Add support for certificate stores in CERT structure. This makes it
     possible to have different stores per SSL structure or one store in
     the parent SSL_CTX. Include distint stores for certificate chain
     verification and chain building. New ctrl SSL_CTRL_BUILD_CERT_CHAIN
     to build and store a certificate chain in CERT structure: returing
     an error if the chain cannot be built: this will allow applications
     to test if a chain is correctly configured.

     Note: if the CERT based stores are not set then the parent SSL_CTX
     store is used to retain compatibility with existing behaviour.

     [Steve Henson]

  *) New function ssl_set_client_disabled to set a ciphersuite disabled
     mask based on the current session, check mask when sending client
     hello and checking the requested ciphersuite.
     [Steve Henson]

  *) New ctrls to retrieve and set certificate types in a certificate
     request message. Print out received values in s_client. If certificate
     types is not set with custom values set sensible values based on
     supported signature algorithms.
     [Steve Henson]

  *) Support for distinct client and server supported signature algorithms.
     [Steve Henson]

  *) Add certificate callback. If set this is called whenever a certificate
     is required by client or server. An application can decide which
     certificate chain to present based on arbitrary criteria: for example
     supported signature algorithms. Add very simple example to s_server.
     This fixes many of the problems and restrictions of the existing client
     certificate callback: for example you can now clear an existing
     certificate and specify the whole chain.
     [Steve Henson]

  *) Add new "valid_flags" field to CERT_PKEY structure which determines what
     the certificate can be used for (if anything). Set valid_flags field 
     in new tls1_check_chain function. Simplify ssl_set_cert_masks which used
     to have similar checks in it.

     Add new "cert_flags" field to CERT structure and include a "strict mode".
     This enforces some TLS certificate requirements (such as only permitting
     certificate signature algorithms contained in the supported algorithms
     extension) which some implementations ignore: this option should be used
     with caution as it could cause interoperability issues.
     [Steve Henson]

  *) Update and tidy signature algorithm extension processing. Work out
     shared signature algorithms based on preferences and peer algorithms
     and print them out in s_client and s_server. Abort handshake if no
     shared signature algorithms.
     [Steve Henson]

  *) Add new functions to allow customised supported signature algorithms
     for SSL and SSL_CTX structures. Add options to s_client and s_server
     to support them.
     [Steve Henson]

  *) New function SSL_certs_clear() to delete all references to certificates
     from an SSL structure. Before this once a certificate had been added
     it couldn't be removed.
     [Steve Henson]

  *) Integrate hostname, email address and IP address checking with certificate
     verification. New verify options supporting checking in opensl utility.
     [Steve Henson]

  *) Fixes and wildcard matching support to hostname and email checking
     functions. Add manual page.
     [Florian Weimer (Red Hat Product Security Team)]

  *) New functions to check a hostname email or IP address against a
     certificate. Add options x509 utility to print results of checks against
     a certificate.
     [Steve Henson]

  *) Fix OCSP checking.
     [Rob Stradling <rob.stradling@comodo.com> and Ben Laurie]

  *) Initial experimental support for explicitly trusted non-root CAs. 
     OpenSSL still tries to build a complete chain to a root but if an
     intermediate CA has a trust setting included that is used. The first
     setting is used: whether to trust (e.g., -addtrust option to the x509
     utility) or reject.
     [Steve Henson]

  *) Add -trusted_first option which attempts to find certificates in the
     trusted store even if an untrusted chain is also supplied.
     [Steve Henson]

  *) MIPS assembly pack updates: support for MIPS32r2 and SmartMIPS ASE,
     platform support for Linux and Android.
     [Andy Polyakov]

  *) Support for linux-x32, ILP32 environment in x86_64 framework.
     [Andy Polyakov]

  *) Experimental multi-implementation support for FIPS capable OpenSSL.
     When in FIPS mode the approved implementations are used as normal,
     when not in FIPS mode the internal unapproved versions are used instead.
     This means that the FIPS capable OpenSSL isn't forced to use the
     (often lower performance) FIPS implementations outside FIPS mode.
     [Steve Henson]

  *) Transparently support X9.42 DH parameters when calling
     PEM_read_bio_DHparameters. This means existing applications can handle
     the new parameter format automatically.
     [Steve Henson]

  *) Initial experimental support for X9.42 DH parameter format: mainly
     to support use of 'q' parameter for RFC5114 parameters.
     [Steve Henson]

  *) Add DH parameters from RFC5114 including test data to dhtest.
     [Steve Henson]

  *) Support for automatic EC temporary key parameter selection. If enabled
     the most preferred EC parameters are automatically used instead of
     hardcoded fixed parameters. Now a server just has to call:
     SSL_CTX_set_ecdh_auto(ctx, 1) and the server will automatically
     support ECDH and use the most appropriate parameters.
     [Steve Henson]

  *) Enhance and tidy EC curve and point format TLS extension code. Use
     static structures instead of allocation if default values are used.
     New ctrls to set curves we wish to support and to retrieve shared curves.
     Print out shared curves in s_server. New options to s_server and s_client
     to set list of supported curves.
     [Steve Henson]

  *) New ctrls to retrieve supported signature algorithms and 
     supported curve values as an array of NIDs. Extend openssl utility
     to print out received values.
     [Steve Henson]

  *) Add new APIs EC_curve_nist2nid and EC_curve_nid2nist which convert
     between NIDs and the more common NIST names such as "P-256". Enhance
     ecparam utility and ECC method to recognise the NIST names for curves.
     [Steve Henson]

  *) Enhance SSL/TLS certificate chain handling to support different
     chains for each certificate instead of one chain in the parent SSL_CTX.
     [Steve Henson]

  *) Support for fixed DH ciphersuite client authentication: where both
     server and client use DH certificates with common parameters.
     [Steve Henson]

  *) Support for fixed DH ciphersuites: those requiring DH server
     certificates.
     [Steve Henson]

  *) New function i2d_re_X509_tbs for re-encoding the TBS portion of
     the certificate.
     Note: Related 1.0.2-beta specific macros X509_get_cert_info,
     X509_CINF_set_modified, X509_CINF_get_issuer, X509_CINF_get_extensions and
     X509_CINF_get_signature were reverted post internal team review.

 Changes between 1.0.1k and 1.0.1l [15 Jan 2015]

  *) Build fixes for the Windows and OpenVMS platforms
     [Matt Caswell and Richard Levitte]

 Changes between 1.0.1j and 1.0.1k [8 Jan 2015]

  *) Fix DTLS segmentation fault in dtls1_get_record. A carefully crafted DTLS
     message can cause a segmentation fault in OpenSSL due to a NULL pointer
     dereference. This could lead to a Denial Of Service attack. Thanks to
     Markus Stenberg of Cisco Systems, Inc. for reporting this issue.
     (CVE-2014-3571)
     [Steve Henson]

  *) Fix DTLS memory leak in dtls1_buffer_record. A memory leak can occur in the
     dtls1_buffer_record function under certain conditions. In particular this
     could occur if an attacker sent repeated DTLS records with the same
     sequence number but for the next epoch. The memory leak could be exploited
     by an attacker in a Denial of Service attack through memory exhaustion.
     Thanks to Chris Mueller for reporting this issue.
     (CVE-2015-0206)
     [Matt Caswell]

  *) Fix issue where no-ssl3 configuration sets method to NULL. When openssl is
     built with the no-ssl3 option and a SSL v3 ClientHello is received the ssl
     method would be set to NULL which could later result in a NULL pointer
     dereference. Thanks to Frank Schmirler for reporting this issue.
     (CVE-2014-3569)
     [Kurt Roeckx]

  *) Abort handshake if server key exchange message is omitted for ephemeral
     ECDH ciphersuites.

     Thanks to Karthikeyan Bhargavan of the PROSECCO team at INRIA for
     reporting this issue.
     (CVE-2014-3572)
     [Steve Henson]

  *) Remove non-export ephemeral RSA code on client and server. This code
     violated the TLS standard by allowing the use of temporary RSA keys in
     non-export ciphersuites and could be used by a server to effectively
     downgrade the RSA key length used to a value smaller than the server
     certificate. Thanks for Karthikeyan Bhargavan of the PROSECCO team at
     INRIA or reporting this issue.
     (CVE-2015-0204)
     [Steve Henson]

  *) Fixed issue where DH client certificates are accepted without verification.
     An OpenSSL server will accept a DH certificate for client authentication
     without the certificate verify message. This effectively allows a client to
     authenticate without the use of a private key. This only affects servers
     which trust a client certificate authority which issues certificates
     containing DH keys: these are extremely rare and hardly ever encountered.
     Thanks for Karthikeyan Bhargavan of the PROSECCO team at INRIA or reporting
     this issue.
     (CVE-2015-0205)
     [Steve Henson]

  *) Ensure that the session ID context of an SSL is updated when its
     SSL_CTX is updated via SSL_set_SSL_CTX.

     The session ID context is typically set from the parent SSL_CTX,
     and can vary with the CTX.
     [Adam Langley]

  *) Fix various certificate fingerprint issues.

     By using non-DER or invalid encodings outside the signed portion of a
     certificate the fingerprint can be changed without breaking the signature.
     Although no details of the signed portion of the certificate can be changed
     this can cause problems with some applications: e.g. those using the
     certificate fingerprint for blacklists.

     1. Reject signatures with non zero unused bits.

     If the BIT STRING containing the signature has non zero unused bits reject
     the signature. All current signature algorithms require zero unused bits.

     2. Check certificate algorithm consistency.

     Check the AlgorithmIdentifier inside TBS matches the one in the
     certificate signature. NB: this will result in signature failure
     errors for some broken certificates.

     Thanks to Konrad Kraszewski from Google for reporting this issue.

     3. Check DSA/ECDSA signatures use DER.

     Reencode DSA/ECDSA signatures and compare with the original received
     signature. Return an error if there is a mismatch.

     This will reject various cases including garbage after signature
     (thanks to Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS
     program for discovering this case) and use of BER or invalid ASN.1 INTEGERs
     (negative or with leading zeroes).

     Further analysis was conducted and fixes were developed by Stephen Henson
     of the OpenSSL core team.

     (CVE-2014-8275)
     [Steve Henson]

   *) Correct Bignum squaring. Bignum squaring (BN_sqr) may produce incorrect
      results on some platforms, including x86_64. This bug occurs at random
      with a very low probability, and is not known to be exploitable in any
      way, though its exact impact is difficult to determine. Thanks to Pieter
      Wuille (Blockstream) who reported this issue and also suggested an initial
      fix. Further analysis was conducted by the OpenSSL development team and
      Adam Langley of Google. The final fix was developed by Andy Polyakov of
      the OpenSSL core team.
      (CVE-2014-3570)
      [Andy Polyakov]

   *) Do not resume sessions on the server if the negotiated protocol
      version does not match the session's version. Resuming with a different
      version, while not strictly forbidden by the RFC, is of questionable
      sanity and breaks all known clients.
      [David Benjamin, Emilia Käsper]

   *) Tighten handling of the ChangeCipherSpec (CCS) message: reject
      early CCS messages during renegotiation. (Note that because
      renegotiation is encrypted, this early CCS was not exploitable.)
      [Emilia Käsper]

   *) Tighten client-side session ticket handling during renegotiation:
      ensure that the client only accepts a session ticket if the server sends
      the extension anew in the ServerHello. Previously, a TLS client would
      reuse the old extension state and thus accept a session ticket if one was
      announced in the initial ServerHello.

      Similarly, ensure that the client requires a session ticket if one
      was advertised in the ServerHello. Previously, a TLS client would
      ignore a missing NewSessionTicket message.
      [Emilia Käsper]

 Changes between 1.0.1i and 1.0.1j [15 Oct 2014]

  *) SRTP Memory Leak.

     A flaw in the DTLS SRTP extension parsing code allows an attacker, who
     sends a carefully crafted handshake message, to cause OpenSSL to fail
     to free up to 64k of memory causing a memory leak. This could be
     exploited in a Denial Of Service attack. This issue affects OpenSSL
     1.0.1 server implementations for both SSL/TLS and DTLS regardless of
     whether SRTP is used or configured. Implementations of OpenSSL that
     have been compiled with OPENSSL_NO_SRTP defined are not affected.

     The fix was developed by the OpenSSL team.
     (CVE-2014-3513)
     [OpenSSL team]

  *) Session Ticket Memory Leak.

     When an OpenSSL SSL/TLS/DTLS server receives a session ticket the
     integrity of that ticket is first verified. In the event of a session
     ticket integrity check failing, OpenSSL will fail to free memory
     causing a memory leak. By sending a large number of invalid session
     tickets an attacker could exploit this issue in a Denial Of Service
     attack.
     (CVE-2014-3567)
     [Steve Henson]

  *) Build option no-ssl3 is incomplete.

     When OpenSSL is configured with "no-ssl3" as a build option, servers
     could accept and complete a SSL 3.0 handshake, and clients could be
     configured to send them.
     (CVE-2014-3568)
     [Akamai and the OpenSSL team]

  *) Add support for TLS_FALLBACK_SCSV.
     Client applications doing fallback retries should call
     SSL_set_mode(s, SSL_MODE_SEND_FALLBACK_SCSV).
     (CVE-2014-3566)
     [Adam Langley, Bodo Moeller]

  *) Add additional DigestInfo checks.
 
     Reencode DigestInto in DER and check against the original when
     verifying RSA signature: this will reject any improperly encoded
     DigestInfo structures.

     Note: this is a precautionary measure and no attacks are currently known.

     [Steve Henson]

 Changes between 1.0.1h and 1.0.1i [6 Aug 2014]

  *) Fix SRP buffer overrun vulnerability. Invalid parameters passed to the
     SRP code can be overrun an internal buffer. Add sanity check that
     g, A, B < N to SRP code.

     Thanks to Sean Devlin and Watson Ladd of Cryptography Services, NCC
     Group for discovering this issue.
     (CVE-2014-3512)
     [Steve Henson]

  *) A flaw in the OpenSSL SSL/TLS server code causes the server to negotiate
     TLS 1.0 instead of higher protocol versions when the ClientHello message
     is badly fragmented. This allows a man-in-the-middle attacker to force a
     downgrade to TLS 1.0 even if both the server and the client support a
     higher protocol version, by modifying the client's TLS records.

     Thanks to David Benjamin and Adam Langley (Google) for discovering and
     researching this issue.
     (CVE-2014-3511)
     [David Benjamin]

  *) OpenSSL DTLS clients enabling anonymous (EC)DH ciphersuites are subject
     to a denial of service attack. A malicious server can crash the client
     with a null pointer dereference (read) by specifying an anonymous (EC)DH
     ciphersuite and sending carefully crafted handshake messages.

     Thanks to Felix Gröbert (Google) for discovering and researching this
     issue.
     (CVE-2014-3510)
     [Emilia Käsper]

  *) By sending carefully crafted DTLS packets an attacker could cause openssl
     to leak memory. This can be exploited through a Denial of Service attack.
     Thanks to Adam Langley for discovering and researching this issue.
     (CVE-2014-3507)
     [Adam Langley]

  *) An attacker can force openssl to consume large amounts of memory whilst
     processing DTLS handshake messages. This can be exploited through a
     Denial of Service attack.
     Thanks to Adam Langley for discovering and researching this issue.
     (CVE-2014-3506)
     [Adam Langley]

  *) An attacker can force an error condition which causes openssl to crash
     whilst processing DTLS packets due to memory being freed twice. This
     can be exploited through a Denial of Service attack.
     Thanks to Adam Langley and Wan-Teh Chang for discovering and researching
     this issue.
     (CVE-2014-3505)
     [Adam Langley]

  *) If a multithreaded client connects to a malicious server using a resumed
     session and the server sends an ec point format extension it could write
     up to 255 bytes to freed memory.

     Thanks to Gabor Tyukasz (LogMeIn Inc) for discovering and researching this
     issue.
     (CVE-2014-3509)
     [Gabor Tyukasz]

  *) A malicious server can crash an OpenSSL client with a null pointer
     dereference (read) by specifying an SRP ciphersuite even though it was not
     properly negotiated with the client. This can be exploited through a
     Denial of Service attack.

     Thanks to Joonas Kuorilehto and Riku Hietamäki (Codenomicon) for
     discovering and researching this issue.
     (CVE-2014-5139)
     [Steve Henson]

  *) A flaw in OBJ_obj2txt may cause pretty printing functions such as
     X509_name_oneline, X509_name_print_ex et al. to leak some information
     from the stack. Applications may be affected if they echo pretty printing
     output to the attacker.

     Thanks to Ivan Fratric (Google) for discovering this issue.
     (CVE-2014-3508)
     [Emilia Käsper, and Steve Henson]

  *) Fix ec_GFp_simple_points_make_affine (thus, EC_POINTs_mul etc.)
     for corner cases. (Certain input points at infinity could lead to
     bogus results, with non-infinity inputs mapped to infinity too.)
     [Bodo Moeller]

 Changes between 1.0.1g and 1.0.1h [5 Jun 2014]

  *) Fix for SSL/TLS MITM flaw. An attacker using a carefully crafted
     handshake can force the use of weak keying material in OpenSSL
     SSL/TLS clients and servers.

     Thanks to KIKUCHI Masashi (Lepidum Co. Ltd.) for discovering and
     researching this issue. (CVE-2014-0224)
     [KIKUCHI Masashi, Steve Henson]

  *) Fix DTLS recursion flaw. By sending an invalid DTLS handshake to an
     OpenSSL DTLS client the code can be made to recurse eventually crashing
     in a DoS attack.

     Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
     (CVE-2014-0221)
     [Imre Rad, Steve Henson]

  *) Fix DTLS invalid fragment vulnerability. A buffer overrun attack can
     be triggered by sending invalid DTLS fragments to an OpenSSL DTLS
     client or server. This is potentially exploitable to run arbitrary
     code on a vulnerable client or server.

     Thanks to Jüri Aedla for reporting this issue. (CVE-2014-0195)
     [Jüri Aedla, Steve Henson]

  *) Fix bug in TLS code where clients enable anonymous ECDH ciphersuites
     are subject to a denial of service attack.

     Thanks to Felix Gröbert and Ivan Fratric at Google for discovering
     this issue. (CVE-2014-3470)
     [Felix Gröbert, Ivan Fratric, Steve Henson]

  *) Harmonize version and its documentation. -f flag is used to display
     compilation flags.
     [mancha <mancha1@zoho.com>]

  *) Fix eckey_priv_encode so it immediately returns an error upon a failure
     in i2d_ECPrivateKey.
     [mancha <mancha1@zoho.com>]

  *) Fix some double frees. These are not thought to be exploitable.
     [mancha <mancha1@zoho.com>]

 Changes between 1.0.1f and 1.0.1g [7 Apr 2014]

  *) A missing bounds check in the handling of the TLS heartbeat extension
     can be used to reveal up to 64k of memory to a connected client or
     server.

     Thanks for Neel Mehta of Google Security for discovering this bug and to
     Adam Langley <agl@chromium.org> and Bodo Moeller <bmoeller@acm.org> for
     preparing the fix (CVE-2014-0160)
     [Adam Langley, Bodo Moeller]

  *) Fix for the attack described in the paper "Recovering OpenSSL
     ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack"
     by Yuval Yarom and Naomi Benger. Details can be obtained from:
     http://eprint.iacr.org/2014/140

     Thanks to Yuval Yarom and Naomi Benger for discovering this
     flaw and to Yuval Yarom for supplying a fix (CVE-2014-0076)
     [Yuval Yarom and Naomi Benger]

  *) TLS pad extension: draft-agl-tls-padding-03

     Workaround for the "TLS hang bug" (see FAQ and PR#2771): if the
     TLS client Hello record length value would otherwise be > 255 and
     less that 512 pad with a dummy extension containing zeroes so it
     is at least 512 bytes long.

     [Adam Langley, Steve Henson]

 Changes between 1.0.1e and 1.0.1f [6 Jan 2014]

  *) Fix for TLS record tampering bug. A carefully crafted invalid 
     handshake could crash OpenSSL with a NULL pointer exception.
     Thanks to Anton Johansson for reporting this issues.
     (CVE-2013-4353)

  *) Keep original DTLS digest and encryption contexts in retransmission
     structures so we can use the previous session parameters if they need
     to be resent. (CVE-2013-6450)
     [Steve Henson]

  *) Add option SSL_OP_SAFARI_ECDHE_ECDSA_BUG (part of SSL_OP_ALL) which
     avoids preferring ECDHE-ECDSA ciphers when the client appears to be
     Safari on OS X.  Safari on OS X 10.8..10.8.3 advertises support for
     several ECDHE-ECDSA ciphers, but fails to negotiate them.  The bug
     is fixed in OS X 10.8.4, but Apple have ruled out both hot fixing
     10.8..10.8.3 and forcing users to upgrade to 10.8.4 or newer.
     [Rob Stradling, Adam Langley]

 Changes between 1.0.1d and 1.0.1e [11 Feb 2013]

  *) Correct fix for CVE-2013-0169. The original didn't work on AES-NI
     supporting platforms or when small records were transferred.
     [Andy Polyakov, Steve Henson]

 Changes between 1.0.1c and 1.0.1d [5 Feb 2013]

  *) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.

     This addresses the flaw in CBC record processing discovered by 
     Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
     at: http://www.isg.rhul.ac.uk/tls/     

     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 Adam Langley and
     Emilia Käsper for the initial patch.
     (CVE-2013-0169)
     [Emilia Käsper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]

  *) Fix flaw in AESNI handling of TLS 1.2 and 1.1 records for CBC mode
     ciphersuites which can be exploited in a denial of service attack.
     Thanks go to and to Adam Langley <agl@chromium.org> for discovering
     and detecting this bug and to Wolfgang Ettlinger
     <wolfgang.ettlinger@gmail.com> for independently discovering this issue.
     (CVE-2012-2686)
     [Adam Langley]

  *) Return an error when checking OCSP signatures when key is NULL.
     This fixes a DoS attack. (CVE-2013-0166)
     [Steve Henson]

  *) Make openssl verify return errors.
     [Chris Palmer <palmer@google.com> and Ben Laurie]

  *) Call OCSP Stapling callback after ciphersuite has been chosen, so
     the right response is stapled. Also change SSL_get_certificate()
     so it returns the certificate actually sent.
     See http://rt.openssl.org/Ticket/Display.html?id=2836.
     [Rob Stradling <rob.stradling@comodo.com>]

  *) Fix possible deadlock when decoding public keys.
     [Steve Henson]

  *) Don't use TLS 1.0 record version number in initial client hello
     if renegotiating.
     [Steve Henson]

 Changes between 1.0.1b and 1.0.1c [10 May 2012]

  *) Sanity check record length before skipping explicit IV in TLS
     1.2, 1.1 and DTLS to fix DoS attack.

     Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
     fuzzing as a service testing platform.
     (CVE-2012-2333)
     [Steve Henson]

  *) Initialise tkeylen properly when encrypting CMS messages.
     Thanks to Solar Designer of Openwall for reporting this issue.
     [Steve Henson]

  *) In FIPS mode don't try to use composite ciphers as they are not
     approved.
     [Steve Henson]

 Changes between 1.0.1a and 1.0.1b [26 Apr 2012]

  *) OpenSSL 1.0.0 sets SSL_OP_ALL to 0x80000FFFL and OpenSSL 1.0.1 and
     1.0.1a set SSL_OP_NO_TLSv1_1 to 0x00000400L which would unfortunately
     mean any application compiled against OpenSSL 1.0.0 headers setting
     SSL_OP_ALL would also set SSL_OP_NO_TLSv1_1, unintentionally disablng
     TLS 1.1 also. Fix this by changing the value of SSL_OP_NO_TLSv1_1 to
     0x10000000L Any application which was previously compiled against
     OpenSSL 1.0.1 or 1.0.1a headers and which cares about SSL_OP_NO_TLSv1_1
     will need to be recompiled as a result. Letting be results in
     inability to disable specifically TLS 1.1 and in client context,
     in unlike event, limit maximum offered version to TLS 1.0 [see below].
     [Steve Henson]

  *) In order to ensure interoperabilty SSL_OP_NO_protocolX does not
     disable just protocol X, but all protocols above X *if* there are
     protocols *below* X still enabled. In more practical terms it means
     that if application wants to disable TLS1.0 in favor of TLS1.1 and
     above, it's not sufficient to pass SSL_OP_NO_TLSv1, one has to pass
     SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. This applies to
     client side.
     [Andy Polyakov]

 Changes between 1.0.1 and 1.0.1a [19 Apr 2012]

  *) Check for potentially exploitable overflows in asn1_d2i_read_bio
     BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
     in CRYPTO_realloc_clean.

     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