CHANGES

 OpenSSL CHANGES
 _______________

 Changes between 0.9.6 and 0.9.7  [xx XXX 2001]

     Both OpenSSL 0.9.6a (bugfix release, 5 Apr 2001) and OpenSSL 0.9.7
     are based on OpenSSL 0.9.6.  
     Change log entries are tagged as follows:
         -) applies to 0.9.6a (/0.9.6b) only
         *) applies to 0.9.6a (/0.9.6b) and 0.9.7
         +) applies to 0.9.7 only

  *) The countermeasure against Bleichbacher's attack on PKCS #1 v1.5
     RSA encryption was accidentily removed in s3_srvr.c in OpenSSL 0.9.5
     when fixing the server behaviour for backwards-compatible 'client
     hello' messages.  (Note that the attack is impractical against
     SSL 3.0 and TLS 1.0 anyway because length and version checking
     means that the probability of guessing a valid ciphertext is
     around 2^-40; see section 5 in Bleichenbacher's CRYPTO '98
     paper.)

     Before 0.9.5, the countermeasure (hide the error by generating a
     random 'decryption result') did not work properly because
     ERR_clear_error() was missing, meaning that SSL_get_error() would
     detect the supposedly ignored error.

     Both problems are now fixed.
     [Bodo Moeller]

  *) In crypto/bio/bf_buff.c, increase DEFAULT_BUFFER_SIZE to 4096
     (previously it was 1024).
     [Bodo Moeller]

  +) Fix a memory leak in 'sk_dup()' in the case reallocation fails. (Also
     tidy up some unecessarily weird code in 'sk_new()').
     [Geoff, reported by Diego Tartara <dtartara@novamens.com>]

  +) Change the key loading routines for ENGINEs to use the same kind
     callback (pem_password_cb) as all other routines that need this
     kind of callback.
     [Richard Levitte]

  *) Fix for compatibility mode trust settings: ignore trust settings
     unless some valid trust or reject settings are present.
     [Steve Henson]

  *) Fix for blowfish EVP: its a variable length cipher.
     [Steve Henson]

  +) Increase ENTROPY_NEEDED to 32 bytes, as Rijndael can operate with
     256 bit (=32 byte) keys. Of course seeding with more entropy bytes
     than this minimum value is recommended.
     [Lutz Jaenicke]

  +) New random seeder for OpenVMS, using the system process statistics
     that are easily reachable.
     [Richard Levitte]

  +) Windows apparently can't transparently handle global
     variables defined in DLLs. Initialisations such as:

        const ASN1_ITEM *it = &ASN1_INTEGER_it;

     wont compile. This is used by the any applications that need to
     delcare their own ASN1 modules. This was fixed by adding the option
     EXPORT_VAR_AS_FN to all Win32 platforms, although this isn't strictly
     needed for static libraries under Win32.
     [Steve Henson]

  +) New functions X509_PURPOSE_set() and X509_TRUST_set() to handle
     setting of purpose and trust fields. New X509_STORE trust and
     purpose functions and tidy up setting in other SSL functions.
     [Steve Henson]

  +) Add copies of X509_STORE_CTX fields and callbacks to X509_STORE
     structure. These are inherited by X509_STORE_CTX when it is 
     initialised. This allows various defaults to be set in the
     X509_STORE structure (such as flags for CRL checking and custom
     purpose or trust settings) for functions which only use X509_STORE_CTX
     internally such as S/MIME.

     Modify X509_STORE_CTX_purpose_inherit() so it only sets purposes and
     trust settings if they are not set in X509_STORE. This allows X509_STORE
     purposes and trust (in S/MIME for example) to override any set by default.

     Add command line options for CRL checking to smime, s_client and s_server
     applications.
     [Steve Henson]

  +) Initial CRL based revocation checking. If the CRL checking flag(s)
     are set then the CRL is looked up in the X509_STORE structure and
     its validity and signature checked, then if the certificate is found
     in the CRL the verify fails with a revoked error.

     Various new CRL related callbacks added to X509_STORE_CTX structure.

     Command line options added to 'verify' application to support this.

     This needs some additional work, such as being able to handle multiple
     CRLs with different times, extension based lookup (rather than just
     by subject name) and ultimately more complete V2 CRL extension
     handling.
     [Steve Henson]

  +) Add a general user interface API.  This is designed to replace things
     like des_read_password and friends (backward compatibility functions
     using this new API are provided).  The purpose is to remove prompting
     functions from the DES code section as well as provide for prompting
     through dialog boxes in a window system and the like.
     [Richard Levitte]

  *) In versions up to 0.9.6, RAND_file_name() resorted to file ".rnd"
     in the current directory if neither $RANDFILE nor $HOME was set.
     RAND_file_name() in 0.9.6a returned NULL in this case.  This has
     caused some confusion to Windows users who haven't defined $HOME.
     Thus RAND_file_name() is changed again: e_os.h can define a
     DEFAULT_HOME, which will be used if $HOME is not set.
     For Windows, we use "C:"; on other platforms, we still require
     environment variables.

  +) Add "ex_data" support to ENGINE so implementations can add state at a
     per-structure level rather than having to store it globally.
     [Geoff]

  +) Make it possible for ENGINE structures to be copied when retrieved by
     ENGINE_by_id() if the ENGINE specifies a new flag: ENGINE_FLAGS_BY_ID_COPY.
     This causes the "original" ENGINE structure to act like a template,
     analogous to the RSA vs. RSA_METHOD type of separation. Because of this
     operational state can be localised to each ENGINE structure, despite the
     fact they all share the same "methods". New ENGINE structures returned in
     this case have no functional references and the return value is the single
     structural reference. This matches the single structural reference returned
     by ENGINE_by_id() normally, when it is incremented on the pre-existing
     ENGINE structure.
     [Geoff]

  *) Fix various bugs related to DSA S/MIME verification. Handle missing
     parameters in DSA public key structures and return an error in the
     DSA routines if parameters are absent.
     [Steve Henson]

  +) Fix ASN1 decoder when decoding type ANY and V_ASN1_OTHER: since this
     needs to match any other type at all we need to manually clear the
     tag cache.
     [Steve Henson]

  +) Changes to the "openssl engine" utility to include;
     - verbosity levels ('-v', '-vv', and '-vvv') that provide information
       about an ENGINE's available control commands.
     - executing control commands from command line arguments using the
       '-pre' and '-post' switches. '-post' is only used if '-t' is
       specified and the ENGINE is successfully initialised. The syntax for
       the individual commands are colon-separated, for example;
	 openssl engine chil -pre FORK_CHECK:0 -pre SO_PATH:/lib/test.so
     [Geoff]

  +) New dynamic control command support for ENGINEs. ENGINEs can now
     declare their own commands (numbers), names (strings), descriptions,
     and input types for run-time discovery by calling applications. A
     subset of these commands are implicitly classed as "executable"
     depending on their input type, and only these can be invoked through
     the new string-based API function ENGINE_ctrl_cmd_string(). (Eg. this
     can be based on user input, config files, etc). The distinction is
     that "executable" commands cannot return anything other than a boolean
     result and can only support numeric or string input, whereas some
     discoverable commands may only be for direct use through
     ENGINE_ctrl(), eg. supporting the exchange of binary data, function
     pointers, or other custom uses. The "executable" commands are to
     support parameterisations of ENGINE behaviour that can be
     unambiguously defined by ENGINEs and used consistently across any
     OpenSSL-based application. Commands have been added to all the
     existing hardware-supporting ENGINEs, noticeably "SO_PATH" to allow
     control over shared-library paths without source code alterations.
     [Geoff]

  +) Changed all ENGINE implementations to dynamically allocate their
     ENGINEs rather than declaring them statically. Apart from this being
     necessary with the removal of the ENGINE_FLAGS_MALLOCED distinction,
     this also allows the implementations to compile without using the
     internal engine_int.h header.
     [Geoff]

  +) Minor adjustment to "rand" code. RAND_get_rand_method() now returns a
     'const' value. Any code that should be able to modify a RAND_METHOD
     should already have non-const pointers to it (ie. they should only
     modify their own ones).
     [Geoff]

  +) Made a variety of little tweaks to the ENGINE code.
     - "atalla" and "ubsec" string definitions were moved from header files
       to C code. "nuron" string definitions were placed in variables
       rather than hard-coded - allowing parameterisation of these values
       later on via ctrl() commands.
     - Removed unused "#if 0"'d code.
     - Fixed engine list iteration code so it uses ENGINE_free() to release
       structural references.
     - Constified the RAND_METHOD element of ENGINE structures.
     - Constified various get/set functions as appropriate and added
       missing functions (including a catch-all ENGINE_cpy that duplicates