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 OpenSSL CHANGES
 Changes between 1.0.2 and 1.1.0  [xx XXX xxxx]
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  *) Added ASYNC support. Libcrypto now includes the async sub-library to enable
     cryptographic operations to be performed asynchronously as long as an
     asynchronous capable engine is used. See the ASYNC_start_job() man page for
     further details. Libssl has also had this capability integrated with the
     introduction of the new mode SSL_MODE_ASYNC and associated error
     SSL_ERROR_WANT_ASYNC. See the SSL_CTX_set_mode() and SSL_get_error() man
     pages. This work was developed in partnership with Intel Corp.
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     [Matt Caswell]

  *) SSL_{CTX_}set_ecdh_auto() has been removed and ECDH is support is
     always enabled now.  If you want to disable the support you should
     exclude it using the list of supported ciphers.
     [Kurt Roeckx]

  *) SSL_{CTX}_set_tmp_ecdh() which can set 1 EC curve now internally calls
     SSL_{CTX_}set1_curves() which can set a list.
     [Kurt Roeckx]

  *) Remove support for SSL_{CTX_}set_tmp_ecdh_callback().  You should set the
     curve you want to support using SSL_{CTX_}set1_curves().
     [Kurt Roeckx]

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  *) State machine rewrite. The state machine code has been significantly
     refactored in order to remove much duplication of code and solve issues
     with the old code (see ssl/statem/README for further details). This change
     does have some associated API changes. Notably the SSL_state() function
     has been removed and replaced by SSL_get_state which now returns an
     "OSSL_HANDSHAKE_STATE" instead of an int. SSL_set_state() has been removed
     altogether. The previous handshake states defined in ssl.h and ssl3.h have
     also been removed.
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     [Matt Caswell]

  *) All instances of the string "ssleay" in the public API were replaced
     with OpenSSL (case-matching; e.g., OPENSSL_VERSION for #define's)
     Some error codes related to internal RSA_eay API's were renamed.
     [Rich Salz]

  *) The demo files in crypto/threads were moved to demo/threads.
     [Rich Salz]

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  *) Removed obsolete engines: 4758cca, aep, atalla, cswift, nuron and sureware.
     [Matt Caswell]

  *) New ASN.1 embed macro.

     New ASN.1 macro ASN1_EMBED. This is the same as ASN1_SIMPLE except the
     structure is not allocated: it is part of the parent. That is instead of

     FOO *x;

     it must be:

     FOO x;

     This reduces memory fragmentation and make it impossible to accidentally
     set a mandatory field to NULL.

     This currently only works for some fields specifically a SEQUENCE, CHOICE,
     or ASN1_STRING type which is part of a parent SEQUENCE. Since it is
     equivalent to ASN1_SIMPLE it cannot be tagged, OPTIONAL, SET OF or
     SEQUENCE OF.
     [Steve Henson]

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  *) Remove EVP_CHECK_DES_KEY, a compile-time option that never compiled.
     [Emilia Käsper]
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  *) Removed DES and RC4 ciphersuites from DEFAULT. Also removed RC2 although
     in 1.0.2 EXPORT was already removed and the only RC2 ciphersuite is also
     an EXPORT one. COMPLEMENTOFDEFAULT has been updated accordingly to add
     DES and RC4 ciphersuites.
     [Matt Caswell]

  *) Rewrite EVP_DecodeUpdate (base64 decoding) to fix several bugs.
     This changes the decoding behaviour for some invalid messages,
     though the change is mostly in the more lenient direction, and
     legacy behaviour is preserved as much as possible.
     [Emilia Käsper]
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  *) Fix no-stdio build.
    [ David Woodhouse <David.Woodhouse@intel.com> and also
      Ivan Nestlerode <ivan.nestlerode@sonos.com> ]
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  *) New testing framework
     The testing framework has been largely rewritten and is now using
     perl and the perl modules Test::Harness and an extended variant of
     Test::More called OpenSSL::Test to do its work.  All test scripts in
     test/ have been rewritten into test recipes, and all direct calls to
     executables in test/Makefile have become individual recipes using the
     simplified testing OpenSSL::Test::Simple.

     For documentation on our testing modules, do:

        perldoc test/testlib/OpenSSL/Test/Simple.pm
        perldoc test/testlib/OpenSSL/Test.pm

     [Richard Levitte]

  *) In DSA_generate_parameters_ex, if the provided seed is too short,
     return an error
     [Rich Salz and Ismo Puustinen <ismo.puustinen@intel.com>]

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  *) Rewrite PSK to support ECDHE_PSK, DHE_PSK and RSA_PSK. Add ciphersuites
     from RFC4279, RFC4785, RFC5487, RFC5489.

     Thanks to Christian J. Dietrich and Giuseppe D'Angelo for the
     original RSA_PSK patch.
     [Steve Henson]

  *) Dropped support for the SSL3_FLAGS_DELAY_CLIENT_FINISHED flag. This SSLeay
     era flag was never set throughout the codebase (only read). Also removed
     SSL3_FLAGS_POP_BUFFER which was only used if
     SSL3_FLAGS_DELAY_CLIENT_FINISHED was also set.
     [Matt Caswell]

  *) Changed the default name options in the "ca", "crl", "req" and "x509"
     to be "oneline" instead of "compat".
     [Richard Levitte]

  *) Remove SSL_OP_TLS_BLOCK_PADDING_BUG. This is SSLeay legacy, we're
     not aware of clients that still exhibit this bug, and the workaround
     hasn't been working properly for a while.
     [Emilia Käsper]
  *) The return type of BIO_number_read() and BIO_number_written() as well as
     the corresponding num_read and num_write members in the BIO structure has
     changed from unsigned long to uint64_t. On platforms where an unsigned
     long is 32 bits (e.g. Windows) these counters could overflow if >4Gb is
     transferred.
     [Matt Caswell]

  *) Given the pervasive nature of TLS extensions it is inadvisable to run
     OpenSSL without support for them. It also means that maintaining
     the OPENSSL_NO_TLSEXT option within the code is very invasive (and probably
     not well tested). Therefore the OPENSSL_NO_TLSEXT option has been removed.
     [Matt Caswell]
  *) Removed support for the two export grade static DH ciphersuites
     EXP-DH-RSA-DES-CBC-SHA and EXP-DH-DSS-DES-CBC-SHA. These two ciphersuites
     were newly added (along with a number of other static DH ciphersuites) to
     1.0.2. However the two export ones have *never* worked since they were
     introduced. It seems strange in any case to be adding new export
     ciphersuites, and given "logjam" it also does not seem correct to fix them.
     [Matt Caswell]

  *) Version negotiation has been rewritten. In particular SSLv23_method(),
     SSLv23_client_method() and SSLv23_server_method() have been deprecated,
     and turned into macros which simply call the new preferred function names
     TLS_method(), TLS_client_method() and TLS_server_method(). All new code
     should use the new names instead. Also as part of this change the ssl23.h
     header file has been removed.
     [Matt Caswell]

  *) Support for Kerberos ciphersuites in TLS (RFC2712) has been removed. This
     code and the associated standard is no longer considered fit-for-purpose.
     [Matt Caswell]
  *) RT2547 was closed.  When generating a private key, try to make the
     output file readable only by the owner.  This behavior change might
     be noticeable when interacting with other software.

  *) Documented all exdata functions.  Added CRYPTO_free_ex_index.
     Added a test.
     [Rich Salz]

  *) Added HTTP GET support to the ocsp command.
     [Rich Salz]

  *) RAND_pseudo_bytes has been deprecated. Users should use RAND_bytes instead.
     [Matt Caswell]
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  *) Added support for TLS extended master secret from
     draft-ietf-tls-session-hash-03.txt. Thanks for Alfredo Pironti for an
     initial patch which was a great help during development.
     [Steve Henson]

  *) All libssl internal structures have been removed from the public header
     files, and the OPENSSL_NO_SSL_INTERN option has been removed (since it is
     now redundant). Users should not attempt to access internal structures
     directly. Instead they should use the provided API functions.
     [Matt Caswell]
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  *) config has been changed so that by default OPENSSL_NO_DEPRECATED is used.
     Access to deprecated functions can be re-enabled by running config with
     "enable-deprecated". In addition applications wishing to use deprecated
     functions must define OPENSSL_USE_DEPRECATED. Note that this new behaviour
     will, by default, disable some transitive includes that previously existed
     in the header files (e.g. ec.h will no longer, by default, include bn.h)
     [Matt Caswell]

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  *) Added support for OCB mode. OpenSSL has been granted a patent license
     compatible with the OpenSSL license for use of OCB. Details are available
     at https://www.openssl.org/docs/misc/OCB-patent-grant-OpenSSL.pdf. Support
     for OCB can be removed by calling config with no-ocb.
     [Matt Caswell]
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