CHANGES

 OpenSSL CHANGES
 _______________

 Changes between 1.0.0 and 1.1.0  [xx XXX xxxx]

  *) Initial CMAC implementation. WARNING: EXPERIMENTAL, API MAY CHANGE.
     Add CMAC pkey methods.
     [Steve Henson]

  *) Experiemental regnegotiation in s_server -www mode. If the client 
     browses /reneg connection is renegotiated. If /renegcert it is
     renegotiated requesting a certificate.
     [Steve Henson]

  *) Add an "external" session cache for debugging purposes to s_server. This
     should help trace issues which normally are only apparent in deployed
     multi-process servers.
     [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]

  *) Experiemental 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]

  *) Extensive audit of libcrypto with DEBUG_UNUSED. Fix many cases where
     return value is ignored. NB. The functions RAND_add(), RAND_seed(),
     BIO_set_cipher() and some obscure PEM functions were changed so they
     can now return an error. The RAND changes required a change to the
     RAND_METHOD structure.
     [Steve Henson]

  *) New macro __owur for "OpenSSL Warn Unused Result". This makes use of
     a gcc attribute to warn if the result of a function is ignored. This
     is enable if DEBUG_UNUSED is set. Add to several functions in evp.h
     whose return value is often ignored. 
     [Steve Henson]

 Changes between 0.9.8m (?) and 1.0.0  [xx XXX xxxx]

  *) 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]

  *) Constify crypto/cast (i.e., <openssl/cast.h>): a CAST_KEY doesn't
     change when encrypting or decrypting.
     [Bodo Moeller]

  *) 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 wont
     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 interal 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 paramaters 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
     funcionality) such that between otherwise identical
     cihpersuites, 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]

  *) Various modifications and fixes to SSL/TLS cipher string
     handling.  For ECC, the code now distinguishes between fixed ECDH
     with RSA certificates on the one hand and with ECDSA certificates
     on the other hand, since these are separate ciphersuites.  The
     unused code for Fortezza ciphersuites has been removed.

     For consistency with EDH, ephemeral ECDH is now called "EECDH"
     (not "ECDHE").  For consistency with the code for DH
     certificates, use of ECDH certificates is now considered ECDH
     authentication, not RSA or ECDSA authentication (the latter is
     merely the CA's signing algorithm and not actively used in the
     protocol).

     The temporary ciphersuite alias "ECCdraft" is no longer
     available, and ECC ciphersuites are no longer excluded from "ALL"
     and "DEFAULT".  The following aliases now exist for RFC 4492
     ciphersuites, most of these by analogy with the DH case:

         kECDHr   - ECDH cert, signed with RSA
         kECDHe   - ECDH cert, signed with ECDSA
         kECDH    - ECDH cert (signed with either RSA or ECDSA)
         kEECDH   - ephemeral ECDH
         ECDH     - ECDH cert or ephemeral ECDH

         aECDH    - ECDH cert
         aECDSA   - ECDSA cert
         ECDSA    - ECDSA cert

         AECDH    - anonymous ECDH
         EECDH    - non-anonymous ephemeral ECDH (equivalent to "kEECDH:-AECDH")

     [Bodo Moeller]

  *) Add additional S/MIME capabilities for AES and GOST ciphers if supported.
     Use correct micalg parameters depending on digest(s) in signed message.
     [Steve Henson]

  *) Add engine support for EVP_PKEY_ASN1_METHOD. Add functions to process
     an ENGINE asn1 method. Support ENGINE lookups in the ASN1 code.
     [Steve Henson]

  *) Initial engine support for EVP_PKEY_METHOD. New functions to permit
     an engine to register a method. Add ENGINE lookups for methods and
     functional reference processing.
     [Steve Henson]

  *) New functions EVP_Digest{Sign,Verify)*. These are enchance versions of
     EVP_{Sign,Verify}* which allow an application to customise the signature
     process.
     [Steve Henson]

  *) New -resign option to smime utility. This adds one or more signers
     to an existing PKCS#7 signedData structure. Also -md option to use an
     alternative message digest algorithm for signing.
     [Steve Henson]

  *) Tidy up PKCS#7 routines and add new functions to make it easier to
     create PKCS7 structures containing multiple signers. Update smime
     application to support multiple signers.
     [Steve Henson]

  *) New -macalg option to pkcs12 utility to allow setting of an alternative
     digest MAC.
     [Steve Henson]

  *) Initial support for PKCS#5 v2.0 PRFs other than default SHA1 HMAC.
     Reorganize PBE internals to lookup from a static table using NIDs,
     add support for HMAC PBE OID translation. Add a EVP_CIPHER ctrl:
     EVP_CTRL_PBE_PRF_NID this allows a cipher to specify an alternative
     PRF which will be automatically used with PBES2.
     [Steve Henson]

  *) Replace the algorithm specific calls to generate keys in "req" with the
     new API.
     [Steve Henson]

  *) Update PKCS#7 enveloped data routines to use new API. This is now
     supported by any public key method supporting the encrypt operation. A
     ctrl is added to allow the public key algorithm to examine or modify
     the PKCS#7 RecipientInfo structure if it needs to: for RSA this is
     a no op.
     [Steve Henson]

  *) Add a ctrl to asn1 method to allow a public key algorithm to express
     a default digest type to use. In most cases this will be SHA1 but some
     algorithms (such as GOST) need to specify an alternative digest. The
     return value indicates how strong the prefernce is 1 means optional and
     2 is mandatory (that is it is the only supported type). Modify
     ASN1_item_sign() to accept a NULL digest argument to indicate it should
     use the default md. Update openssl utilities to use the default digest
     type for signing if it is not explicitly indicated.
     [Steve Henson]

  *) Use OID cross reference table in ASN1_sign() and ASN1_verify(). New 
     EVP_MD flag EVP_MD_FLAG_PKEY_METHOD_SIGNATURE. This uses the relevant
     signing method from the key type. This effectively removes the link
     between digests and public key types.
     [Steve Henson]

  *) Add an OID cross reference table and utility functions. Its purpose is to
     translate between signature OIDs such as SHA1WithrsaEncryption and SHA1,
     rsaEncryption. This will allow some of the algorithm specific hackery
     needed to use the correct OID to be removed. 
     [Steve Henson]

  *) Remove algorithm specific dependencies when setting PKCS7_SIGNER_INFO
     structures for PKCS7_sign(). They are now set up by the relevant public
     key ASN1 method.
     [Steve Henson]

  *) Add provisional EC pkey method with support for ECDSA and ECDH.
     [Steve Henson]

  *) Add support for key derivation (agreement) in the API, DH method and
     pkeyutl.
     [Steve Henson]

  *) Add DSA pkey method and DH pkey methods, extend DH ASN1 method to support
     public and private key formats. As a side effect these add additional 
     command line functionality not previously available: DSA signatures can be
     generated and verified using pkeyutl and DH key support and generation in
     pkey, genpkey.
     [Steve Henson]

  *) BeOS support.
     [Oliver Tappe <zooey@hirschkaefer.de>]

  *) New make target "install_html_docs" installs HTML renditions of the
     manual pages.
     [Oliver Tappe <zooey@hirschkaefer.de>]

  *) New utility "genpkey" this is analagous to "genrsa" etc except it can
     generate keys for any algorithm. Extend and update EVP_PKEY_METHOD to
     support key and parameter generation and add initial key generation
     functionality for RSA.
     [Steve Henson]

  *) Add functions for main EVP_PKEY_method operations. The undocumented
     functions EVP_PKEY_{encrypt,decrypt} have been renamed to
     EVP_PKEY_{encrypt,decrypt}_old. 
     [Steve Henson]

  *) Initial definitions for EVP_PKEY_METHOD. This will be a high level public
     key API, doesn't do much yet.
     [Steve Henson]

  *) New function EVP_PKEY_asn1_get0_info() to retrieve information about
     public key algorithms. New option to openssl utility:
     "list-public-key-algorithms" to print out info.
     [Steve Henson]

  *) Implement the Supported Elliptic Curves Extension for
     ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
     [Douglas Stebila]

  *) Don't free up OIDs in OBJ_cleanup() if they are in use by EVP_MD or
     EVP_CIPHER structures to avoid later problems in EVP_cleanup().
     [Steve Henson]

  *) New utilities pkey and pkeyparam. These are similar to algorithm specific
     utilities such as rsa, dsa, dsaparam etc except they process any key
     type.
     [Steve Henson]

  *) Transfer public key printing routines to EVP_PKEY_ASN1_METHOD. New 
     functions EVP_PKEY_print_public(), EVP_PKEY_print_private(),
     EVP_PKEY_print_param() to print public key data from an EVP_PKEY
     structure.
     [Steve Henson]

  *) Initial support for pluggable public key ASN1.
     De-spaghettify the public key ASN1 handling. Move public and private
     key ASN1 handling to a new EVP_PKEY_ASN1_METHOD structure. Relocate
     algorithm specific handling to a single module within the relevant
     algorithm directory. Add functions to allow (near) opaque processing
     of public and private key structures.
     [Steve Henson]

  *) Implement the Supported Point Formats Extension for
     ECC ciphersuites from draft-ietf-tls-ecc-12.txt.
     [Douglas Stebila]

  *) Add initial support for RFC 4279 PSK TLS ciphersuites. Add members
     for the psk identity [hint] and the psk callback functions to the
     SSL_SESSION, SSL and SSL_CTX structure.
     
     New ciphersuites:
         PSK-RC4-SHA, PSK-3DES-EDE-CBC-SHA, PSK-AES128-CBC-SHA,
         PSK-AES256-CBC-SHA
 
     New functions:
         SSL_CTX_use_psk_identity_hint
         SSL_get_psk_identity_hint
         SSL_get_psk_identity
         SSL_use_psk_identity_hint

     [Mika Kousa and Pasi Eronen of Nokia Corporation]

  *) Add RFC 3161 compliant time stamp request creation, response generation
     and response verification functionality.
     [Zoltán Glózik <zglozik@opentsa.org>, The OpenTSA Project]

  *) Add initial support for TLS extensions, specifically for the server_name
     extension so far.  The SSL_SESSION, SSL_CTX, and SSL data structures now
     have new members for a host name.  The SSL data structure has an
     additional member SSL_CTX *initial_ctx so that new sessions can be
     stored in that context to allow for session resumption, even after the
     SSL has been switched to a new SSL_CTX in reaction to a client's
     server_name extension.

     New functions (subject to change):

         SSL_get_servername()
         SSL_get_servername_type()
         SSL_set_SSL_CTX()

     New CTRL codes and macros (subject to change):

         SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
                                 - SSL_CTX_set_tlsext_servername_callback()
         SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG
                                      - SSL_CTX_set_tlsext_servername_arg()
         SSL_CTRL_SET_TLSEXT_HOSTNAME           - SSL_set_tlsext_host_name()

     openssl s_client has a new '-servername ...' option.

     openssl s_server has new options '-servername_host ...', '-cert2 ...',
     '-key2 ...', '-servername_fatal' (subject to change).  This allows
     testing the HostName extension for a specific single host name ('-cert'
     and '-key' remain fallbacks for handshakes without HostName
     negotiation).  If the unrecogninzed_name alert has to be sent, this by
     default is a warning; it becomes fatal with the '-servername_fatal'
     option.

     [Peter Sylvester,  Remy Allais, Christophe Renou]

  *) Whirlpool hash implementation is added.
     [Andy Polyakov]

  *) BIGNUM code on 64-bit SPARCv9 targets is switched from bn(64,64) to
     bn(64,32). Because of instruction set limitations it doesn't have
     any negative impact on performance. This was done mostly in order
     to make it possible to share assembler modules, such as bn_mul_mont
     implementations, between 32- and 64-bit builds without hassle.
     [Andy Polyakov]

  *) Move code previously exiled into file crypto/ec/ec2_smpt.c
     to ec2_smpl.c, and no longer require the OPENSSL_EC_BIN_PT_COMP
     macro.
     [Bodo Moeller]

  *) New candidate for BIGNUM assembler implementation, bn_mul_mont,
     dedicated Montgomery multiplication procedure, is introduced.
     BN_MONT_CTX is modified to allow bn_mul_mont to reach for higher
     "64-bit" performance on certain 32-bit targets.
     [Andy Polyakov]

  *) New option SSL_OP_NO_COMP to disable use of compression selectively
     in SSL structures. New SSL ctrl to set maximum send fragment size. 
     Save memory by seeting the I/O buffer sizes dynamically instead of
     using the maximum available value.
     [Steve Henson]

  *) New option -V for 'openssl ciphers'. This prints the ciphersuite code
     in addition to the text details.
     [Bodo Moeller]

  *) Very, very preliminary EXPERIMENTAL support for printing of general
     ASN1 structures. This currently produces rather ugly output and doesn't
     handle several customised structures at all.
     [Steve Henson]

  *) Integrated support for PVK file format and some related formats such
     as MS PUBLICKEYBLOB and PRIVATEKEYBLOB. Command line switches to support
     these in the 'rsa' and 'dsa' utilities.
     [Steve Henson]

  *) Support for PKCS#1 RSAPublicKey format on rsa utility command line.
     [Steve Henson]

  *) Remove the ancient ASN1_METHOD code. This was only ever used in one
     place for the (very old) "NETSCAPE" format certificates which are now
     handled using new ASN1 code equivalents.
     [Steve Henson]

  *) Let the TLSv1_method() etc. functions return a 'const' SSL_METHOD
     pointer and make the SSL_METHOD parameter in SSL_CTX_new,
     SSL_CTX_set_ssl_version and SSL_set_ssl_method 'const'.
     [Nils Larsch]

  *) Modify CRL distribution points extension code to print out previously
     unsupported fields. Enhance extension setting code to allow setting of
     all fields.
     [Steve Henson]

  *) Add print and set support for Issuing Distribution Point CRL extension.
     [Steve Henson]

  *) Change 'Configure' script to enable Camellia by default.
     [NTT]

 Changes between 0.9.8l (?) and 0.9.8m (?)  [xx XXX xxxx]

  *) On some versions of WIN32 Heap32Next is very slow. This can cause
     excessive delays in the RAND_poll(): over a minute. As a workaround
     include a time check in the inner Heap32Next loop too.
     [Steve Henson]

  *) The code that handled flushing of data in SSL/TLS originally used the
     BIO_CTRL_INFO ctrl to see if any data was pending first. This caused
     the problem outlined in PR#1949. The fix suggested there however can
     trigger problems with buggy BIO_CTRL_WPENDING (e.g. some versions
     of Apache). So instead simplify the code to flush unconditionally.
     This should be fine since flushing with no data to flush is a no op.
     [Steve Henson]

  *) Handle TLS versions 2.0 and later properly and correctly use the
     highest version of TLS/SSL supported. Although TLS >= 2.0 is some way
     off ancient servers have a habit of sticking around for a while...
     [Steve Henson]

  *) Modify compression code so it frees up structures without using the
     ex_data callbacks. This works around a problem where some applications
     call CRYPTO_cleanup_all_ex_data() before application exit (e.g. when
     restarting) then use compression (e.g. SSL with compression) later.
     This results in significant per-connection memory leaks and
     has caused some security issues including CVE-2008-1678 and
     CVE-2009-4355.
     [Steve Henson]

  *) Add option SSL_OP_LEGACY_SERVER_CONNECT which will allow clients to
     connect (but not renegotiate) with servers which do not support RI.
     Until RI is more widely deployed this option is enabled by default.
     [Steve Henson]

  *) Add "missing" ssl ctrls to clear options and mode.
     [Steve Henson]

  *) If client attempts to renegotiate and doesn't support RI respond with
     a no_renegotiation alert as required by RFC5746.  Some renegotiating
     TLS clients will continue a connection gracefully when they receive
     the alert. Unfortunately OpenSSL mishandled this alert and would hang
     waiting for a server hello which it will never receive. Now we treat a
     received no_renegotiation alert as a fatal error. This is because
     applications requesting a renegotiation might well expect it to succeed
     and would have no code in place to handle the server denying it so the
     only safe thing to do is to terminate the connection.
     [Steve Henson]

  *) Add ctrl macro SSL_get_secure_renegotiation_support() which returns 1 if
     peer supports secure renegotiation and 0 otherwise. Print out peer
     renegotiation support in s_client/s_server.
     [Steve Henson]

  *) Replace the highly broken and deprecated SPKAC certification method with
     the updated NID creation version. This should correctly handle UTF8.
     [Steve Henson]

  *) Implement RFC5746. Re-enable renegotiation but require the extension
     as needed. Unfortunately, SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
     turns out to be a bad idea. It has been replaced by
     SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION which can be set with
     SSL_CTX_set_options(). This is really not recommended unless you
     know what you are doing.
     [Eric Rescorla <ekr@networkresonance.com>, Ben Laurie, Steve Henson]

  *) Fixes to stateless session resumption handling. Use initial_ctx when
     issuing and attempting to decrypt tickets in case it has changed during
     servername handling. Use a non-zero length session ID when attempting
     stateless session resumption: this makes it possible to determine if
     a resumption has occurred immediately after receiving server hello
     (several places in OpenSSL subtly assume this) instead of later in
     the handshake.
     [Steve Henson]

  *) The functions ENGINE_ctrl(), OPENSSL_isservice(),
     CMS_get1_RecipientRequest() and RAND_bytes() can return <=0 on error
     fixes for a few places where the return code is not checked
     correctly.
     [Julia Lawall <julia@diku.dk>]

  *) Add --strict-warnings option to Configure script to include devteam
     warnings in other configurations.
     [Steve Henson]

  *) Add support for --libdir option and LIBDIR variable in makefiles. This
     makes it possible to install openssl libraries in locations which
     have names other than "lib", for example "/usr/lib64" which some
     systems need.
     [Steve Henson, based on patch from Jeremy Utley]

  *) Don't allow the use of leading 0x80 in OIDs. This is a violation of
     X690 8.9.12 and can produce some misleading textual output of OIDs.
     [Steve Henson, reported by Dan Kaminsky]

  *) Delete MD2 from algorithm tables. This follows the recommendation in
     several standards that it is not used in new applications due to
     several cryptographic weaknesses. For binary compatibility reasons
     the MD2 API is still compiled in by default.
     [Steve Henson]

  *) Add compression id to {d2i,i2d}_SSL_SESSION so it is correctly saved
     and restored.