CHANGES

 OpenSSL CHANGES
 _______________

 Changes between 0.9.7c and 0.9.8  [xx XXX xxxx]

  *) Extend ASN1 oid configuration module. It now additionally accepts the
     syntax:

     shortName = some long name, 1.2.3.4
     [Steve Henson]

  *) Reimplemented the BN_CTX implementation. There is now no more static
     limitation on the number of variables it can handle nor the depth of the
     "stack" handling for BN_CTX_start()/BN_CTX_end() pairs. The stack
     information can now expand as required, and rather than having a single
     static array of bignums, BN_CTX now uses a linked-list of such arrays
     allowing it to expand on demand whilst maintaining the usefulness of
     BN_CTX's "bundling".
     [Geoff Thorpe]

  *) Add a missing BN_CTX parameter to the 'rsa_mod_exp' callback in RSA_METHOD
     to allow all RSA operations to function using a single BN_CTX.
     [Geoff Thorpe]

  *) Preliminary support for certificate policy evaluation and checking. This
     is initially intended to pass the tests outlined in "Conformance Testing
     of Relying Party Client Certificate Path Processing Logic" v1.07.
     [Steve Henson]

  *) bn_dup_expand() has been deprecated, it was introduced in 0.9.7 and
     remained unused and not that useful. A variety of other little bignum
     tweaks and fixes have also been made continuing on from the audit (see
     below).
     [Geoff Thorpe]

  *) Constify all or almost all d2i, c2i, s2i and r2i functions, along with
     associated ASN1, EVP and SSL functions and old ASN1 macros.
     [Richard Levitte]

  *) BN_zero() only needs to set 'top' and 'neg' to zero for correct results,
     and this should never fail. So the return value from the use of
     BN_set_word() (which can fail due to needless expansion) is now deprecated;
     if OPENSSL_NO_DEPRECATED is defined, BN_zero() is a void macro.
     [Geoff Thorpe]

  *) BN_CTX_get() should return zero-valued bignums, providing the same
     initialised value as BN_new().
     [Geoff Thorpe, suggested by Ulf Möller]

  *) Support for inhibitAnyPolicy certificate extension.
     [Steve Henson]

  *) An audit of the BIGNUM code is underway, for which debugging code is
     enabled when BN_DEBUG is defined. This makes stricter enforcements on what
     is considered valid when processing BIGNUMs, and causes execution to
     assert() when a problem is discovered. If BN_DEBUG_RAND is defined,
     further steps are taken to deliberately pollute unused data in BIGNUM
     structures to try and expose faulty code further on. For now, openssl will
     (in its default mode of operation) continue to tolerate the inconsistent
     forms that it has tolerated in the past, but authors and packagers should
     consider trying openssl and their own applications when compiled with
     these debugging symbols defined. It will help highlight potential bugs in
     their own code, and will improve the test coverage for OpenSSL itself. At
     some point, these tighter rules will become openssl's default to improve
     maintainability, though the assert()s and other overheads will remain only
     in debugging configurations. See bn.h for more details.
     [Geoff Thorpe, Nils Larsch, Ulf Möller]

  *) BN_CTX_init() has been deprecated, as BN_CTX is an opaque structure
     that can only be obtained through BN_CTX_new() (which implicitly
     initialises it). The presence of this function only made it possible
     to overwrite an existing structure (and cause memory leaks).
     [Geoff Thorpe]

  *) Because of the callback-based approach for implementing LHASH as a
     template type, lh_insert() adds opaque objects to hash-tables and
     lh_doall() or lh_doall_arg() are typically used with a destructor callback
     to clean up those corresponding objects before destroying the hash table
     (and losing the object pointers). So some over-zealous constifications in
     LHASH have been relaxed so that lh_insert() does not take (nor store) the
     objects as "const" and the lh_doall[_arg] callback wrappers are not
     prototyped to have "const" restrictions on the object pointers they are
     given (and so aren't required to cast them away any more).
     [Geoff Thorpe]

  *) The tmdiff.h API was so ugly and minimal that our own timing utility
     (speed) prefers to use its own implementation. The two implementations
     haven't been consolidated as yet (volunteers?) but the tmdiff API has had
     its object type properly exposed (MS_TM) instead of casting to/from "char
     *". This may still change yet if someone realises MS_TM and "ms_time_***"
     aren't necessarily the greatest nomenclatures - but this is what was used
     internally to the implementation so I've used that for now.
     [Geoff Thorpe]

  *) Ensure that deprecated functions do not get compiled when
     OPENSSL_NO_DEPRECATED is defined. Some "openssl" subcommands and a few of
     the self-tests were still using deprecated key-generation functions so
     these have been updated also.
     [Geoff Thorpe]

  *) Reorganise PKCS#7 code to separate the digest location functionality
     into PKCS7_find_digest(), digest addtion into PKCS7_bio_add_digest().
     New function PKCS7_set_digest() to set the digest type for PKCS#7
     digestedData type. Add additional code to correctly generate the
     digestedData type and add support for this type in PKCS7 initialization
     functions.
     [Steve Henson]

  *) New function PKCS7_set0_type_other() this initializes a PKCS7 
     structure of type "other".
     [Steve Henson]

  *) Fix prime generation loop in crypto/bn/bn_prime.pl by making
     sure the loop does correctly stop and breaking ("division by zero")
     modulus operations are not performed. The (pre-generated) prime
     table crypto/bn/bn_prime.h was already correct, but it could not be
     re-generated on some platforms because of the "division by zero"
     situation in the script.
     [Ralf S. Engelschall]

  *) Update support for ECC-based TLS ciphersuites according to
     draft-ietf-tls-ecc-03.txt: the KDF1 key derivation function with
     SHA-1 now is only used for "small" curves (where the
     representation of a field element takes up to 24 bytes); for
     larger curves, the field element resulting from ECDH is directly
     used as premaster secret.
     [Douglas Stebila (Sun Microsystems Laboratories)]

  *) Add code for kP+lQ timings to crypto/ec/ectest.c, and add SEC2
     curve secp160r1 to the tests.
     [Douglas Stebila (Sun Microsystems Laboratories)]

  *) Add the possibility to load symbols globally with DSO.
     [Götz Babin-Ebell <babin-ebell@trustcenter.de> via Richard Levitte]

  *) Add the functions ERR_set_mark() and ERR_pop_to_mark() for better
     control of the error stack.
     [Richard Levitte]

  *) Add support for STORE in ENGINE.
     [Richard Levitte]

  *) Add the STORE type.  The intention is to provide a common interface
     to certificate and key stores, be they simple file-based stores, or
     HSM-type store, or LDAP stores, or...
     NOTE: The code is currently UNTESTED and isn't really used anywhere.
     [Richard Levitte]

  *) Add a generic structure called OPENSSL_ITEM.  This can be used to
     pass a list of arguments to any function as well as provide a way
     for a function to pass data back to the caller.
     [Richard Levitte]

  *) Add the functions BUF_strndup() and BUF_memdup().  BUF_strndup()
     works like BUF_strdup() but can be used to duplicate a portion of
     a string.  The copy gets NUL-terminated.  BUF_memdup() duplicates
     a memory area.
     [Richard Levitte]

  *) Add the function sk_find_ex() which works like sk_find(), but will
     return an index to an element even if an exact match couldn't be
     found.  The index is guaranteed to point at the element where the
     searched-for key would be inserted to preserve sorting order.
     [Richard Levitte]

  *) Add the function OBJ_bsearch_ex() which works like OBJ_bsearch() but
     takes an extra flags argument for optional functionality.  Currently,
     the following flags are defined:

	OBJ_BSEARCH_VALUE_ON_NOMATCH
	This one gets OBJ_bsearch_ex() to return a pointer to the first
	element where the comparing function returns a negative or zero
	number.

	OBJ_BSEARCH_FIRST_VALUE_ON_MATCH
	This one gets OBJ_bsearch_ex() to return a pointer to the first
	element where the comparing function returns zero.  This is useful
	if there are more than one element where the comparing function
	returns zero.
     [Richard Levitte]

  *) Make it possible to create self-signed certificates with 'openssl ca'
     in such a way that the self-signed certificate becomes part of the
     CA database and uses the same mechanisms for serial number generation
     as all other certificate signing.  The new flag '-selfsign' enables
     this functionality.  Adapt CA.sh and CA.pl.in.
     [Richard Levitte]

  *) Add functionality to check the public key of a certificate request
     against a given private.  This is useful to check that a certificate
     request can be signed by that key (self-signing).
     [Richard Levitte]

  *) Make it possible to have multiple active certificates with the same
     subject in the CA index file.  This is done only if the keyword
     'unique_subject' is set to 'no' in the main CA section (default
     if 'CA_default') of the configuration file.  The value is saved
     with the database itself in a separate index attribute file,
     named like the index file with '.attr' appended to the name.