CHANGES

     the LHASH abstraction, and any casts that remain are "bugs". See
     the callback types and macros at the head of lhash.h for details
     (and "OBJ_cleanup" in crypto/objects/obj_dat.c as an example).
     [Geoff Thorpe]

  *) Add automatic query of EGD sockets in RAND_poll() for the unix variant.
     If /dev/[u]random devices are not available or do not return enough
     entropy, EGD style sockets (served by EGD or PRNGD) will automatically
     be queried.
     The locations /var/run/egd-pool, /dev/egd-pool, /etc/egd-pool, and
     /etc/entropy will be queried once each in this sequence, quering stops
     when enough entropy was collected without querying more sockets.
     [Lutz Jaenicke]

  *) Change the Unix RAND_poll() variant to be able to poll several
     random devices, as specified by DEVRANDOM, until a sufficient amount
     of data has been collected.   We spend at most 10 ms on each file
     (select timeout) and read in non-blocking mode.  DEVRANDOM now
     defaults to the list "/dev/urandom", "/dev/random", "/dev/srandom"
     (previously it was just the string "/dev/urandom"), so on typical
     platforms the 10 ms delay will never occur.
     Also separate out the Unix variant to its own file, rand_unix.c.
     For VMS, there's a currently-empty rand_vms.c.
     [Richard Levitte]

  *) Move OCSP client related routines to ocsp_cl.c. These
     provide utility functions which an application needing
     to issue a request to an OCSP responder and analyse the
     response will typically need: as opposed to those which an
     OCSP responder itself would need which will be added later.

     OCSP_request_sign() signs an OCSP request with an API similar
     to PKCS7_sign(). OCSP_response_status() returns status of OCSP
     response. OCSP_response_get1_basic() extracts basic response
     from response. OCSP_resp_find_status(): finds and extracts status
     information from an OCSP_CERTID structure (which will be created
     when the request structure is built). These are built from lower
     level functions which work on OCSP_SINGLERESP structures but
     wont normally be used unless the application wishes to examine
     extensions in the OCSP response for example.

     Replace nonce routines with a pair of functions.
     OCSP_request_add1_nonce() adds a nonce value and optionally
     generates a random value. OCSP_check_nonce() checks the
     validity of the nonce in an OCSP response.
     [Steve Henson]

  *) Change function OCSP_request_add() to OCSP_request_add0_id().
     This doesn't copy the supplied OCSP_CERTID and avoids the
     need to free up the newly created id. Change return type
     to OCSP_ONEREQ to return the internal OCSP_ONEREQ structure.
     This can then be used to add extensions to the request.
     Deleted OCSP_request_new(), since most of its functionality
     is now in OCSP_REQUEST_new() (and the case insensitive name
     clash) apart from the ability to set the request name which
     will be added elsewhere.
     [Steve Henson]

  *) Update OCSP API. Remove obsolete extensions argument from
     various functions. Extensions are now handled using the new
     OCSP extension code. New simple OCSP HTTP function which 
     can be used to send requests and parse the response.
     [Steve Henson]

  *) Fix the PKCS#7 (S/MIME) code to work with new ASN1. Two new
     ASN1_ITEM structures help with sign and verify. PKCS7_ATTR_SIGN
     uses the special reorder version of SET OF to sort the attributes
     and reorder them to match the encoded order. This resolves a long
     standing problem: a verify on a PKCS7 structure just after signing
     it used to fail because the attribute order did not match the
     encoded order. PKCS7_ATTR_VERIFY does not reorder the attributes:
     it uses the received order. This is necessary to tolerate some broken
     software that does not order SET OF. This is handled by encoding
     as a SEQUENCE OF but using implicit tagging (with UNIVERSAL class)
     to produce the required SET OF.
     [Steve Henson]

  *) Have mk1mf.pl generate the macros OPENSSL_BUILD_SHLIBCRYPTO and
     OPENSSL_BUILD_SHLIBSSL and use them appropriately in the header
     files to get correct declarations of the ASN.1 item variables.
     [Richard Levitte]

  *) Rewrite of PKCS#12 code to use new ASN1 functionality. Replace many
     PKCS#12 macros with real functions. Fix two unrelated ASN1 bugs:
     asn1_check_tlen() would sometimes attempt to use 'ctx' when it was
     NULL and ASN1_TYPE was not dereferenced properly in asn1_ex_c2i().
     New ASN1 macro: DECLARE_ASN1_ITEM() which just declares the relevant
     ASN1_ITEM and no wrapper functions.
     [Steve Henson]

  *) New functions or ASN1_item_d2i_fp() and ASN1_item_d2i_bio(). These
     replace the old function pointer based I/O routines. Change most of
     the *_d2i_bio() and *_d2i_fp() functions to use these.
     [Steve Henson]

  *) Enhance mkdef.pl to be more accepting about spacing in C preprocessor
     lines, recognice more "algorithms" that can be deselected, and make
     it complain about algorithm deselection that isn't recognised.
     [Richard Levitte]

  *) New ASN1 functions to handle dup, sign, verify, digest, pack and
     unpack operations in terms of ASN1_ITEM. Modify existing wrappers
     to use new functions. Add NO_ASN1_OLD which can be set to remove
     some old style ASN1 functions: this can be used to determine if old
     code will still work when these eventually go away.
     [Steve Henson]

  *) New extension functions for OCSP structures, these follow the
     same conventions as certificates and CRLs.
     [Steve Henson]

  *) New function X509V3_add1_i2d(). This automatically encodes and
     adds an extension. Its behaviour can be customised with various
     flags to append, replace or delete. Various wrappers added for
     certifcates and CRLs.
     [Steve Henson]

  *) Fix to avoid calling the underlying ASN1 print routine when
     an extension cannot be parsed. Correct a typo in the
     OCSP_SERVICELOC extension. Tidy up print OCSP format.
     [Steve Henson]

  *) Make mkdef.pl parse some of the ASN1 macros and add apropriate
     entries for variables.
     [Steve Henson]

  *) Add functionality to apps/openssl.c for detecting locking
     problems: As the program is single-threaded, all we have
     to do is register a locking callback using an array for
     storing which locks are currently held by the program.
     [Bodo Moeller]

  *) Use a lock around the call to CRYPTO_get_ex_new_index() in
     SSL_get_ex_data_X509_STORE_idx(), which is used in
     ssl_verify_cert_chain() and thus can be called at any time
     during TLS/SSL handshakes so that thread-safety is essential.
     Unfortunately, the ex_data design is not at all suited
     for multi-threaded use, so it probably should be abolished.
     [Bodo Moeller]

  *) Added Broadcom "ubsec" ENGINE to OpenSSL.
     [Broadcom, tweaked and integrated by Geoff Thorpe]

  *) Move common extension printing code to new function
     X509V3_print_extensions(). Reorganise OCSP print routines and
     implement some needed OCSP ASN1 functions. Add OCSP extensions.
     [Steve Henson]

  *) New function X509_signature_print() to remove duplication in some
     print routines.
     [Steve Henson]

  *) Add a special meaning when SET OF and SEQUENCE OF flags are both
     set (this was treated exactly the same as SET OF previously). This
     is used to reorder the STACK representing the structure to match the
     encoding. This will be used to get round a problem where a PKCS7
     structure which was signed could not be verified because the STACK
     order did not reflect the encoded order.
     [Steve Henson]

  *) Reimplement the OCSP ASN1 module using the new code.
     [Steve Henson]

  *) Update the X509V3 code to permit the use of an ASN1_ITEM structure
     for its ASN1 operations. The old style function pointers still exist
     for now but they will eventually go away.
     [Steve Henson]

  *) Merge in replacement ASN1 code from the ASN1 branch. This almost
     completely replaces the old ASN1 functionality with a table driven
     encoder and decoder which interprets an ASN1_ITEM structure describing
     the ASN1 module. Compatibility with the existing ASN1 API (i2d,d2i) is
     largely maintained. Almost all of the old asn1_mac.h macro based ASN1
     has also been converted to the new form.
     [Steve Henson]

  *) Change BN_mod_exp_recp so that negative moduli are tolerated
     (the sign is ignored).  Similarly, ignore the sign in BN_MONT_CTX_set
     so that BN_mod_exp_mont and BN_mod_exp_mont_word work
     for negative moduli.
     [Bodo Moeller]

  *) Fix BN_uadd and BN_usub: Always return non-negative results instead
     of not touching the result's sign bit.
     [Bodo Moeller]

  *) BN_div bugfix: If the result is 0, the sign (res->neg) must not be
     set.
     [Bodo Moeller]

  *) Changed the LHASH code to use prototypes for callbacks, and created
     macros to declare and implement thin (optionally static) functions
     that provide type-safety and avoid function pointer casting for the
     type-specific callbacks.
     [Geoff Thorpe]

  *) Added Kerberos Cipher Suites to be used with TLS, as written in
     RFC 2712.
     [Veers Staats <staatsvr@asc.hpc.mil>,
      Jeffrey Altman <jaltman@columbia.edu>, via Richard Levitte]

  *) Reformat the FAQ so the different questions and answers can be divided
     in sections depending on the subject.
     [Richard Levitte]

  *) Have the zlib compression code load ZLIB.DLL dynamically under
     Windows.
     [Richard Levitte]

  *) New function BN_mod_sqrt for computing square roots modulo a prime
     (using the probabilistic Tonelli-Shanks algorithm unless
     p == 3 (mod 4)  or  p == 5 (mod 8),  which are cases that can
     be handled deterministically).
     [Lenka Fibikova <fibikova@exp-math.uni-essen.de>, Bodo Moeller]

  *) Make BN_mod_inverse faster by explicitly handling small quotients
     in the Euclid loop. (Speed gain about 20% for small moduli [256 or
     512 bits], about 30% for larger ones [1024 or 2048 bits].)
     [Bodo Moeller]

  *) New function BN_kronecker.
     [Bodo Moeller]

  *) Fix BN_gcd so that it works on negative inputs; the result is
     positive unless both parameters are zero.
     Previously something reasonably close to an infinite loop was
     possible because numbers could be growing instead of shrinking
     in the implementation of Euclid's algorithm.
     [Bodo Moeller]

  *) Fix BN_is_word() and BN_is_one() macros to take into account the
     sign of the number in question.

     Fix BN_is_word(a,w) to work correctly for w == 0.

     The old BN_is_word(a,w) macro is now called BN_abs_is_word(a,w)
     because its test if the absolute value of 'a' equals 'w'.
     Note that BN_abs_is_word does *not* handle w == 0 reliably;
     it exists mostly for use in the implementations of BN_is_zero(),
     BN_is_one(), and BN_is_word().
     [Bodo Moeller]

  *) New function BN_swap.
     [Bodo Moeller]

  *) Use BN_nnmod instead of BN_mod in crypto/bn/bn_exp.c so that
     the exponentiation functions are more likely to produce reasonable
     results on negative inputs.
     [Bodo Moeller]

  *) Change BN_mod_mul so that the result is always non-negative.
     Previously, it could be negative if one of the factors was negative;
     I don't think anyone really wanted that behaviour.
     [Bodo Moeller]

  *) Move BN_mod_... functions into new file crypto/bn/bn_mod.c
     (except for exponentiation, which stays in crypto/bn/bn_exp.c,
     and BN_mod_mul_reciprocal, which stays in crypto/bn/bn_recp.c)
     and add new functions:

          BN_nnmod
          BN_mod_sqr
          BN_mod_add
          BN_mod_add_quick
          BN_mod_sub
          BN_mod_sub_quick
          BN_mod_lshift1
          BN_mod_lshift1_quick
          BN_mod_lshift
          BN_mod_lshift_quick

     These functions always generate non-negative results.

     BN_nnmod otherwise is like BN_mod (if BN_mod computes a remainder  r
     such that  |m| < r < 0,  BN_nnmod will output  rem + |m|  instead).

     BN_mod_XXX_quick(r, a, [b,] m) generates the same result as
     BN_mod_XXX(r, a, [b,] m, ctx), but requires that  a  [and  b]
     be reduced modulo  m.
     [Lenka Fibikova <fibikova@exp-math.uni-essen.de>, Bodo Moeller]

#if 0
     The following entry accidentily appeared in the CHANGES file
     distributed with OpenSSL 0.9.7.  The modifications described in
     it do *not* apply to OpenSSL 0.9.7.

  *) Remove a few calls to bn_wexpand() in BN_sqr() (the one in there
     was actually never needed) and in BN_mul().  The removal in BN_mul()
     required a small change in bn_mul_part_recursive() and the addition
     of the functions bn_cmp_part_words(), bn_sub_part_words() and
     bn_add_part_words(), which do the same thing as bn_cmp_words(),
     bn_sub_words() and bn_add_words() except they take arrays with
     differing sizes.
     [Richard Levitte]
#endif

  *) In 'openssl passwd', verify passwords read from the terminal
     unless the '-salt' option is used (which usually means that
     verification would just waste user's time since the resulting
     hash is going to be compared with some given password hash)
     or the new '-noverify' option is used.

     This is an incompatible change, but it does not affect
     non-interactive use of 'openssl passwd' (passwords on the command
     line, '-stdin' option, '-in ...' option) and thus should not
     cause any problems.
     [Bodo Moeller]

  *) Remove all references to RSAref, since there's no more need for it.
     [Richard Levitte]

  *) Make DSO load along a path given through an environment variable
     (SHLIB_PATH) with shl_load().
     [Richard Levitte]

  *) Constify the ENGINE code as a result of BIGNUM constification.
     Also constify the RSA code and most things related to it.  In a
     few places, most notable in the depth of the ASN.1 code, ugly
     casts back to non-const were required (to be solved at a later
     time)
     [Richard Levitte]

  *) Make it so the openssl application has all engines loaded by default.
     [Richard Levitte]

  *) Constify the BIGNUM routines a little more.
     [Richard Levitte]

  *) Add the following functions:

	ENGINE_load_cswift()
	ENGINE_load_chil()
	ENGINE_load_atalla()
	ENGINE_load_nuron()
	ENGINE_load_builtin_engines()

     That way, an application can itself choose if external engines that
     are built-in in OpenSSL shall ever be used or not.  The benefit is
     that applications won't have to be linked with libdl or other dso
     libraries unless it's really needed.

     Changed 'openssl engine' to load all engines on demand.
     Changed the engine header files to avoid the duplication of some
     declarations (they differed!).
     [Richard Levitte]

  *) 'openssl engine' can now list capabilities.
     [Richard Levitte]

  *) Better error reporting in 'openssl engine'.
     [Richard Levitte]

  *) Never call load_dh_param(NULL) in s_server.
     [Bodo Moeller]

  *) Add engine application.  It can currently list engines by name and
     identity, and test if they are actually available.
     [Richard Levitte]

  *) Improve RPM specification file by forcing symbolic linking and making
     sure the installed documentation is also owned by root.root.
     [Damien Miller <djm@mindrot.org>]

  *) Give the OpenSSL applications more possibilities to make use of
     keys (public as well as private) handled by engines.
     [Richard Levitte]

  *) Add OCSP code that comes from CertCo.
     [Richard Levitte]

  *) Add VMS support for the Rijndael code.
     [Richard Levitte]

  *) Added untested support for Nuron crypto accelerator.
     [Ben Laurie]

  *) Add support for external cryptographic devices.  This code was
     previously distributed separately as the "engine" branch.
     [Geoff Thorpe, Richard Levitte]

  *) Rework the filename-translation in the DSO code. It is now possible to
     have far greater control over how a "name" is turned into a filename
     depending on the operating environment and any oddities about the
     different shared library filenames on each system.
     [Geoff Thorpe]

  *) Support threads on FreeBSD-elf in Configure.
     [Richard Levitte]

  *) Fix for SHA1 assembly problem with MASM: it produces
     warnings about corrupt line number information when assembling
     with debugging information. This is caused by the overlapping
     of two sections.
     [Bernd Matthes <mainbug@celocom.de>, Steve Henson]

  *) NCONF changes.
     NCONF_get_number() has no error checking at all.  As a replacement,
     NCONF_get_number_e() is defined (_e for "error checking") and is
     promoted strongly.  The old NCONF_get_number is kept around for
     binary backward compatibility.
     Make it possible for methods to load from something other than a BIO,
     by providing a function pointer that is given a name instead of a BIO.
     For example, this could be used to load configuration data from an
     LDAP server.
     [Richard Levitte]

  *) Fix for non blocking accept BIOs. Added new I/O special reason
     BIO_RR_ACCEPT to cover this case. Previously use of accept BIOs
     with non blocking I/O was not possible because no retry code was
     implemented. Also added new SSL code SSL_WANT_ACCEPT to cover
     this case.
     [Steve Henson]

  *) Added the beginnings of Rijndael support.
     [Ben Laurie]

  *) Fix for bug in DirectoryString mask setting. Add support for
     X509_NAME_print_ex() in 'req' and X509_print_ex() function
     to allow certificate printing to more controllable, additional
     'certopt' option to 'x509' to allow new printing options to be
     set.
     [Steve Henson]

  *) Clean old EAY MD5 hack from e_os.h.
     [Richard Levitte]

 Changes between 0.9.6i and 0.9.6j  [10 Apr 2003]

  *) Countermeasure against the Klima-Pokorny-Rosa extension of
     Bleichbacher's attack on PKCS #1 v1.5 padding: treat
     a protocol version number mismatch like a decryption error
     in ssl3_get_client_key_exchange (ssl/s3_srvr.c).
     [Bodo Moeller]

  *) Turn on RSA blinding by default in the default implementation
     to avoid a timing attack. Applications that don't want it can call
     RSA_blinding_off() or use the new flag RSA_FLAG_NO_BLINDING.
     They would be ill-advised to do so in most cases.
     [Ben Laurie, Steve Henson, Geoff Thorpe, Bodo Moeller]

  *) Change RSA blinding code so that it works when the PRNG is not
     seeded (in this case, the secret RSA exponent is abused as
     an unpredictable seed -- if it is not unpredictable, there
     is no point in blinding anyway).  Make RSA blinding thread-safe
     by remembering the creator's thread ID in rsa->blinding and
     having all other threads use local one-time blinding factors
     (this requires more computation than sharing rsa->blinding, but
     avoids excessive locking; and if an RSA object is not shared
     between threads, blinding will still be very fast).
     [Bodo Moeller]

 Changes between 0.9.6h and 0.9.6i  [19 Feb 2003]

  *) In ssl3_get_record (ssl/s3_pkt.c), minimize information leaked
     via timing by performing a MAC computation even if incorrrect
     block cipher padding has been found.  This is a countermeasure
     against active attacks where the attacker has to distinguish
     between bad padding and a MAC verification error. (CAN-2003-0078)

     [Bodo Moeller; problem pointed out by Brice Canvel (EPFL),
     Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and
     Martin Vuagnoux (EPFL, Ilion)]

 Changes between 0.9.6g and 0.9.6h  [5 Dec 2002]

  *) New function OPENSSL_cleanse(), which is used to cleanse a section of
     memory from it's contents.  This is done with a counter that will
     place alternating values in each byte.  This can be used to solve
     two issues: 1) the removal of calls to memset() by highly optimizing
     compilers, and 2) cleansing with other values than 0, since those can
     be read through on certain media, for example a swap space on disk.
     [Geoff Thorpe]

  *) Bugfix: client side session caching did not work with external caching,
     because the session->cipher setting was not restored when reloading
     from the external cache. This problem was masked, when
     SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG (part of SSL_OP_ALL) was set.
     (Found by Steve Haslam <steve@araqnid.ddts.net>.)
     [Lutz Jaenicke]

  *) Fix client_certificate (ssl/s2_clnt.c): The permissible total
     length of the REQUEST-CERTIFICATE message is 18 .. 34, not 17 .. 33.
     [Zeev Lieber <zeev-l@yahoo.com>]

  *) Undo an undocumented change introduced in 0.9.6e which caused
     repeated calls to OpenSSL_add_all_ciphers() and 
     OpenSSL_add_all_digests() to be ignored, even after calling
     EVP_cleanup().
     [Richard Levitte]

  *) Change the default configuration reader to deal with last line not
     being properly terminated.
     [Richard Levitte]

  *) Change X509_NAME_cmp() so it applies the special rules on handling
     DN values that are of type PrintableString, as well as RDNs of type
     emailAddress where the value has the type ia5String.
     [stefank@valicert.com via Richard Levitte]

  *) Add a SSL_SESS_CACHE_NO_INTERNAL_STORE flag to take over half
     the job SSL_SESS_CACHE_NO_INTERNAL_LOOKUP was inconsistently
     doing, define a new flag (SSL_SESS_CACHE_NO_INTERNAL) to be
     the bitwise-OR of the two for use by the majority of applications
     wanting this behaviour, and update the docs. The documented
     behaviour and actual behaviour were inconsistent and had been
     changing anyway, so this is more a bug-fix than a behavioural
     change.
     [Geoff Thorpe, diagnosed by Nadav Har'El]

  *) Don't impose a 16-byte length minimum on session IDs in ssl/s3_clnt.c
     (the SSL 3.0 and TLS 1.0 specifications allow any length up to 32 bytes).
     [Bodo Moeller]

  *) Fix initialization code race conditions in
        SSLv23_method(),  SSLv23_client_method(),   SSLv23_server_method(),
        SSLv2_method(),   SSLv2_client_method(),    SSLv2_server_method(),
        SSLv3_method(),   SSLv3_client_method(),    SSLv3_server_method(),
        TLSv1_method(),   TLSv1_client_method(),    TLSv1_server_method(),
        ssl2_get_cipher_by_char(),
        ssl3_get_cipher_by_char().
     [Patrick McCormick <patrick@tellme.com>, Bodo Moeller]

  *) Reorder cleanup sequence in SSL_CTX_free(): only remove the ex_data after
     the cached sessions are flushed, as the remove_cb() might use ex_data
     contents. Bug found by Sam Varshavchik <mrsam@courier-mta.com>
     (see [openssl.org #212]).
     [Geoff Thorpe, Lutz Jaenicke]

  *) Fix typo in OBJ_txt2obj which incorrectly passed the content
     length, instead of the encoding length to d2i_ASN1_OBJECT.
     [Steve Henson]

 Changes between 0.9.6f and 0.9.6g  [9 Aug 2002]

  *) [In 0.9.6g-engine release:]
     Fix crypto/engine/vendor_defns/cswift.h for WIN32 (use '_stdcall').
     [Lynn Gazis <lgazis@rainbow.com>]

 Changes between 0.9.6e and 0.9.6f  [8 Aug 2002]

  *) Fix ASN1 checks. Check for overflow by comparing with LONG_MAX
     and get fix the header length calculation.
     [Florian Weimer <Weimer@CERT.Uni-Stuttgart.DE>,
	Alon Kantor <alonk@checkpoint.com> (and others),
	Steve Henson]

  *) Use proper error handling instead of 'assertions' in buffer
     overflow checks added in 0.9.6e.  This prevents DoS (the
     assertions could call abort()).
     [Arne Ansper <arne@ats.cyber.ee>, Bodo Moeller]

 Changes between 0.9.6d and 0.9.6e  [30 Jul 2002]

  *) Add various sanity checks to asn1_get_length() to reject
     the ASN1 length bytes if they exceed sizeof(long), will appear
     negative or the content length exceeds the length of the
     supplied buffer.
     [Steve Henson, Adi Stav <stav@mercury.co.il>, James Yonan <jim@ntlp.com>]

  *) Fix cipher selection routines: ciphers without encryption had no flags
     for the cipher strength set and where therefore not handled correctly
     by the selection routines (PR #130).
     [Lutz Jaenicke]

  *) Fix EVP_dsa_sha macro.
     [Nils Larsch]

  *) New option
          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
     for disabling the SSL 3.0/TLS 1.0 CBC vulnerability countermeasure
     that was added in OpenSSL 0.9.6d.

     As the countermeasure turned out to be incompatible with some
     broken SSL implementations, the new option is part of SSL_OP_ALL.
     SSL_OP_ALL is usually employed when compatibility with weird SSL
     implementations is desired (e.g. '-bugs' option to 's_client' and
     's_server'), so the new option is automatically set in many
     applications.
     [Bodo Moeller]

  *) Changes in security patch:

     Changes marked "(CHATS)" were sponsored by the Defense Advanced
     Research Projects Agency (DARPA) and Air Force Research Laboratory,
     Air Force Materiel Command, USAF, under agreement number
     F30602-01-2-0537.

  *) Add various sanity checks to asn1_get_length() to reject
     the ASN1 length bytes if they exceed sizeof(long), will appear
     negative or the content length exceeds the length of the
     supplied buffer. (CAN-2002-0659)
     [Steve Henson, Adi Stav <stav@mercury.co.il>, James Yonan <jim@ntlp.com>]

  *) Assertions for various potential buffer overflows, not known to
     happen in practice.
     [Ben Laurie (CHATS)]

  *) Various temporary buffers to hold ASCII versions of integers were
     too small for 64 bit platforms. (CAN-2002-0655)
     [Matthew Byng-Maddick <mbm@aldigital.co.uk> and Ben Laurie (CHATS)>

  *) Remote buffer overflow in SSL3 protocol - an attacker could
     supply an oversized session ID to a client. (CAN-2002-0656)
     [Ben Laurie (CHATS)]

  *) Remote buffer overflow in SSL2 protocol - an attacker could
     supply an oversized client master key. (CAN-2002-0656)
     [Ben Laurie (CHATS)]

 Changes between 0.9.6c and 0.9.6d  [9 May 2002]

  *) Fix crypto/asn1/a_sign.c so that 'parameters' is omitted (not
     encoded as NULL) with id-dsa-with-sha1.
     [Nils Larsch <nla@trustcenter.de>; problem pointed out by Bodo Moeller]

  *) Check various X509_...() return values in apps/req.c.
     [Nils Larsch <nla@trustcenter.de>]

  *) Fix BASE64 decode (EVP_DecodeUpdate) for data with CR/LF ended lines:
     an end-of-file condition would erronously be flagged, when the CRLF
     was just at the end of a processed block. The bug was discovered when
     processing data through a buffering memory BIO handing the data to a
     BASE64-decoding BIO. Bug fund and patch submitted by Pavel Tsekov
     <ptsekov@syntrex.com> and Nedelcho Stanev.
     [Lutz Jaenicke]

  *) Implement a countermeasure against a vulnerability recently found
     in CBC ciphersuites in SSL 3.0/TLS 1.0: Send an empty fragment
     before application data chunks to avoid the use of known IVs
     with data potentially chosen by the attacker.
     [Bodo Moeller]

  *) Fix length checks in ssl3_get_client_hello().
     [Bodo Moeller]

  *) TLS/SSL library bugfix: use s->s3->in_read_app_data differently
     to prevent ssl3_read_internal() from incorrectly assuming that
     ssl3_read_bytes() found application data while handshake
     processing was enabled when in fact s->s3->in_read_app_data was
     merely automatically cleared during the initial handshake.
     [Bodo Moeller; problem pointed out by Arne Ansper <arne@ats.cyber.ee>]

  *) Fix object definitions for Private and Enterprise: they were not
     recognized in their shortname (=lowercase) representation. Extend
     obj_dat.pl to issue an error when using undefined keywords instead
     of silently ignoring the problem (Svenning Sorensen
     <sss@sss.dnsalias.net>).
     [Lutz Jaenicke]

  *) Fix DH_generate_parameters() so that it works for 'non-standard'
     generators, i.e. generators other than 2 and 5.  (Previously, the
     code did not properly initialise the 'add' and 'rem' values to
     BN_generate_prime().)

     In the new general case, we do not insist that 'generator' is
     actually a primitive root: This requirement is rather pointless;
     a generator of the order-q subgroup is just as good, if not
     better.
     [Bodo Moeller]
 
  *) Map new X509 verification errors to alerts. Discovered and submitted by
     Tom Wu <tom@arcot.com>.
     [Lutz Jaenicke]

  *) Fix ssl3_pending() (ssl/s3_lib.c) to prevent SSL_pending() from
     returning non-zero before the data has been completely received
     when using non-blocking I/O.
     [Bodo Moeller; problem pointed out by John Hughes]

  *) Some of the ciphers missed the strength entry (SSL_LOW etc).
     [Ben Laurie, Lutz Jaenicke]

  *) Fix bug in SSL_clear(): bad sessions were not removed (found by
     Yoram Zahavi <YoramZ@gilian.com>).
     [Lutz Jaenicke]

  *) Add information about CygWin 1.3 and on, and preserve proper
     configuration for the versions before that.
     [Corinna Vinschen <vinschen@redhat.com> and Richard Levitte]

  *) Make removal from session cache (SSL_CTX_remove_session()) more robust:
     check whether we deal with a copy of a session and do not delete from
     the cache in this case. Problem reported by "Izhar Shoshani Levi"
     <izhar@checkpoint.com>.
     [Lutz Jaenicke]

  *) Do not store session data into the internal session cache, if it
     is never intended to be looked up (SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
     flag is set). Proposed by Aslam <aslam@funk.com>.
     [Lutz Jaenicke]

  *) Have ASN1_BIT_STRING_set_bit() really clear a bit when the requested
     value is 0.
     [Richard Levitte]

  *) [In 0.9.6d-engine release:]
     Fix a crashbug and a logic bug in hwcrhk_load_pubkey().
     [Toomas Kiisk <vix@cyber.ee> via Richard Levitte]

  *) Add the configuration target linux-s390x.
     [Neale Ferguson <Neale.Ferguson@SoftwareAG-USA.com> via Richard Levitte]

  *) The earlier bugfix for the SSL3_ST_SW_HELLO_REQ_C case of
     ssl3_accept (ssl/s3_srvr.c) incorrectly used a local flag
     variable as an indication that a ClientHello message has been
     received.  As the flag value will be lost between multiple
     invocations of ssl3_accept when using non-blocking I/O, the
     function may not be aware that a handshake has actually taken
     place, thus preventing a new session from being added to the
     session cache.

     To avoid this problem, we now set s->new_session to 2 instead of
     using a local variable.
     [Lutz Jaenicke, Bodo Moeller]

  *) Bugfix: Return -1 from ssl3_get_server_done (ssl3/s3_clnt.c)
     if the SSL_R_LENGTH_MISMATCH error is detected.
     [Geoff Thorpe, Bodo Moeller]

  *) New 'shared_ldflag' column in Configure platform table.
     [Richard Levitte]

  *) Fix EVP_CIPHER_mode macro.
     ["Dan S. Camper" <dan@bti.net>]

  *) Fix ssl3_read_bytes (ssl/s3_pkt.c): To ignore messages of unknown
     type, we must throw them away by setting rr->length to 0.
     [D P Chang <dpc@qualys.com>]

 Changes between 0.9.6b and 0.9.6c  [21 dec 2001]

  *) Fix BN_rand_range bug pointed out by Dominikus Scherkl
     <Dominikus.Scherkl@biodata.com>.  (The previous implementation
     worked incorrectly for those cases where  range = 10..._2  and
     3*range  is two bits longer than  range.)
     [Bodo Moeller]

  *) Only add signing time to PKCS7 structures if it is not already
     present.
     [Steve Henson]

  *) Fix crypto/objects/objects.h: "ld-ce" should be "id-ce",
     OBJ_ld_ce should be OBJ_id_ce.
     Also some ip-pda OIDs in crypto/objects/objects.txt were
     incorrect (cf. RFC 3039).
     [Matt Cooper, Frederic Giudicelli, Bodo Moeller]

  *) Release CRYPTO_LOCK_DYNLOCK when CRYPTO_destroy_dynlockid()
     returns early because it has nothing to do.
     [Andy Schneider <andy.schneider@bjss.co.uk>]

  *) [In 0.9.6c-engine release:]
     Fix mutex callback return values in crypto/engine/hw_ncipher.c.
     [Andy Schneider <andy.schneider@bjss.co.uk>]

  *) [In 0.9.6c-engine release:]
     Add support for Cryptographic Appliance's keyserver technology.
     (Use engine 'keyclient')
     [Cryptographic Appliances and Geoff Thorpe]

  *) Add a configuration entry for OS/390 Unix.  The C compiler 'c89'
     is called via tools/c89.sh because arguments have to be
     rearranged (all '-L' options must appear before the first object
     modules).
     [Richard Shapiro <rshapiro@abinitio.com>]

  *) [In 0.9.6c-engine release:]
     Add support for Broadcom crypto accelerator cards, backported
     from 0.9.7.
     [Broadcom, Nalin Dahyabhai <nalin@redhat.com>, Mark Cox]

  *) [In 0.9.6c-engine release:]
     Add support for SureWare crypto accelerator cards from 
     Baltimore Technologies.  (Use engine 'sureware')
     [Baltimore Technologies and Mark Cox]

  *) [In 0.9.6c-engine release:]
     Add support for crypto accelerator cards from Accelerated
     Encryption Processing, www.aep.ie.  (Use engine 'aep')
     [AEP Inc. and Mark Cox]

  *) Add a configuration entry for gcc on UnixWare.
     [Gary Benson <gbenson@redhat.com>]

  *) Change ssl/s2_clnt.c and ssl/s2_srvr.c so that received handshake
     messages are stored in a single piece (fixed-length part and
     variable-length part combined) and fix various bugs found on the way.
     [Bodo Moeller]

  *) Disable caching in BIO_gethostbyname(), directly use gethostbyname()
     instead.  BIO_gethostbyname() does not know what timeouts are
     appropriate, so entries would stay in cache even when they have
     become invalid.
     [Bodo Moeller; problem pointed out by Rich Salz <rsalz@zolera.com>

  *) Change ssl23_get_client_hello (ssl/s23_srvr.c) behaviour when
     faced with a pathologically small ClientHello fragment that does
     not contain client_version: Instead of aborting with an error,
     simply choose the highest available protocol version (i.e.,
     TLS 1.0 unless it is disabled).  In practice, ClientHello
     messages are never sent like this, but this change gives us
     strictly correct behaviour at least for TLS.
     [Bodo Moeller]

  *) Fix SSL handshake functions and SSL_clear() such that SSL_clear()
     never resets s->method to s->ctx->method when called from within
     one of the SSL handshake functions.
     [Bodo Moeller; problem pointed out by Niko Baric]

  *) In ssl3_get_client_hello (ssl/s3_srvr.c), generate a fatal alert
     (sent using the client's version number) if client_version is
     smaller than the protocol version in use.  Also change
     ssl23_get_client_hello (ssl/s23_srvr.c) to select TLS 1.0 if
     the client demanded SSL 3.0 but only TLS 1.0 is enabled; then
     the client will at least see that alert.
     [Bodo Moeller]

  *) Fix ssl3_get_message (ssl/s3_both.c) to handle message fragmentation
     correctly.
     [Bodo Moeller]

  *) Avoid infinite loop in ssl3_get_message (ssl/s3_both.c) if a
     client receives HelloRequest while in a handshake.
     [Bodo Moeller; bug noticed by Andy Schneider <andy.schneider@bjss.co.uk>]

  *) Bugfix in ssl3_accept (ssl/s3_srvr.c): Case SSL3_ST_SW_HELLO_REQ_C
     should end in 'break', not 'goto end' which circuments various
     cleanups done in state SSL_ST_OK.   But session related stuff
     must be disabled for SSL_ST_OK in the case that we just sent a
     HelloRequest.

     Also avoid some overhead by not calling ssl_init_wbio_buffer()
     before just sending a HelloRequest.
     [Bodo Moeller, Eric Rescorla <ekr@rtfm.com>]

  *) Fix ssl/s3_enc.c, ssl/t1_enc.c and ssl/s3_pkt.c so that we don't
     reveal whether illegal block cipher padding was found or a MAC
     verification error occured.  (Neither SSLerr() codes nor alerts
     are directly visible to potential attackers, but the information
     may leak via logfiles.)

     Similar changes are not required for the SSL 2.0 implementation
     because the number of padding bytes is sent in clear for SSL 2.0,
     and the extra bytes are just ignored.  However ssl/s2_pkt.c
     failed to verify that the purported number of padding bytes is in
     the legal range.
     [Bodo Moeller]

  *) Add OpenUNIX-8 support including shared libraries
     (Boyd Lynn Gerber <gerberb@zenez.com>).
     [Lutz Jaenicke]

  *) Improve RSA_padding_check_PKCS1_OAEP() check again to avoid
     'wristwatch attack' using huge encoding parameters (cf.
     James H. Manger's CRYPTO 2001 paper).  Note that the
     RSA_PKCS1_OAEP_PADDING case of RSA_private_decrypt() does not use
     encoding parameters and hence was not vulnerable.
     [Bodo Moeller]

  *) BN_sqr() bug fix.
     [Ulf Möller, reported by Jim Ellis <jim.ellis@cavium.com>]

  *) Rabin-Miller test analyses assume uniformly distributed witnesses,
     so use BN_pseudo_rand_range() instead of using BN_pseudo_rand()
     followed by modular reduction.
     [Bodo Moeller; pointed out by Adam Young <AYoung1@NCSUS.JNJ.COM>]

  *) Add BN_pseudo_rand_range() with obvious functionality: BN_rand_range()
     equivalent based on BN_pseudo_rand() instead of BN_rand().
     [Bodo Moeller]

  *) s3_srvr.c: allow sending of large client certificate lists (> 16 kB).
     This function was broken, as the check for a new client hello message
     to handle SGC did not allow these large messages.
     (Tracked down by "Douglas E. Engert" <deengert@anl.gov>.)
     [Lutz Jaenicke]

  *) Add alert descriptions for TLSv1 to SSL_alert_desc_string[_long]().
     [Lutz Jaenicke]

  *) Fix buggy behaviour of BIO_get_num_renegotiates() and BIO_ctrl()
     for BIO_C_GET_WRITE_BUF_SIZE ("Stephen Hinton" <shinton@netopia.com>).
     [Lutz Jaenicke]

  *) Rework the configuration and shared library support for Tru64 Unix.
     The configuration part makes use of modern compiler features and
     still retains old compiler behavior for those that run older versions
     of the OS.  The shared library support part includes a variant that
     uses the RPATH feature, and is available through the special
     configuration target "alpha-cc-rpath", which will never be selected
     automatically.
     [Tim Mooney <mooney@dogbert.cc.ndsu.NoDak.edu> via Richard Levitte]

  *) In ssl3_get_key_exchange (ssl/s3_clnt.c), call ssl3_get_message()
     with the same message size as in ssl3_get_certificate_request().
     Otherwise, if no ServerKeyExchange message occurs, CertificateRequest
     messages might inadvertently be reject as too long.
     [Petr Lampa <lampa@fee.vutbr.cz>]

  *) Enhanced support for IA-64 Unix platforms (well, Linux and HP-UX).
     [Andy Polyakov]

  *) Modified SSL library such that the verify_callback that has been set
     specificly for an SSL object with SSL_set_verify() is actually being
     used. Before the change, a verify_callback set with this function was
     ignored and the verify_callback() set in the SSL_CTX at the time of
     the call was used. New function X509_STORE_CTX_set_verify_cb() introduced
     to allow the necessary settings.
     [Lutz Jaenicke]

  *) Initialize static variable in crypto/dsa/dsa_lib.c and crypto/dh/dh_lib.c
     explicitly to NULL, as at least on Solaris 8 this seems not always to be
     done automatically (in contradiction to the requirements of the C
     standard). This made problems when used from OpenSSH.
     [Lutz Jaenicke]

  *) In OpenSSL 0.9.6a and 0.9.6b, crypto/dh/dh_key.c ignored
     dh->length and always used

          BN_rand_range(priv_key, dh->p).

     BN_rand_range() is not necessary for Diffie-Hellman, and this
     specific range makes Diffie-Hellman unnecessarily inefficient if
     dh->length (recommended exponent length) is much smaller than the
     length of dh->p.  We could use BN_rand_range() if the order of
     the subgroup was stored in the DH structure, but we only have
     dh->length.

     So switch back to

          BN_rand(priv_key, l, ...)

     where 'l' is dh->length if this is defined, or BN_num_bits(dh->p)-1
     otherwise.
     [Bodo Moeller]

  *) In

          RSA_eay_public_encrypt
          RSA_eay_private_decrypt
          RSA_eay_private_encrypt (signing)
          RSA_eay_public_decrypt (signature verification)

     (default implementations for RSA_public_encrypt,
     RSA_private_decrypt, RSA_private_encrypt, RSA_public_decrypt),
     always reject numbers >= n.
     [Bodo Moeller]

  *) In crypto/rand/md_rand.c, use a new short-time lock CRYPTO_LOCK_RAND2
     to synchronize access to 'locking_thread'.  This is necessary on
     systems where access to 'locking_thread' (an 'unsigned long'
     variable) is not atomic.
     [Bodo Moeller]

  *) In crypto/rand/md_rand.c, set 'locking_thread' to current thread's ID
     *before* setting the 'crypto_lock_rand' flag.  The previous code had
     a race condition if 0 is a valid thread ID.
     [Travis Vitek <vitek@roguewave.com>]

  *) Add support for shared libraries under Irix.
     [Albert Chin-A-Young <china@thewrittenword.com>]

  *) Add configuration option to build on Linux on both big-endian and
     little-endian MIPS.
     [Ralf Baechle <ralf@uni-koblenz.de>]

  *) Add the possibility to create shared libraries on HP-UX.
     [Richard Levitte]

 Changes between 0.9.6a and 0.9.6b  [9 Jul 2001]

  *) Change ssleay_rand_bytes (crypto/rand/md_rand.c)
     to avoid a SSLeay/OpenSSL PRNG weakness pointed out by
     Markku-Juhani O. Saarinen <markku-juhani.saarinen@nokia.com>:
     PRNG state recovery was possible based on the output of
     one PRNG request appropriately sized to gain knowledge on
     'md' followed by enough consecutive 1-byte PRNG requests
     to traverse all of 'state'.

     1. When updating 'md_local' (the current thread's copy of 'md')
        during PRNG output generation, hash all of the previous
        'md_local' value, not just the half used for PRNG output.

     2. Make the number of bytes from 'state' included into the hash
        independent from the number of PRNG bytes requested.

     The first measure alone would be sufficient to avoid
     Markku-Juhani's attack.  (Actually it had never occurred
     to me that the half of 'md_local' used for chaining was the
     half from which PRNG output bytes were taken -- I had always
     assumed that the secret half would be used.)  The second
     measure makes sure that additional data from 'state' is never
     mixed into 'md_local' in small portions; this heuristically
     further strengthens the PRNG.
     [Bodo Moeller]

  *) Fix crypto/bn/asm/mips3.s.
     [Andy Polyakov]

  *) When only the key is given to "enc", the IV is undefined. Print out