CHANGES

 OpenSSL CHANGES
 _______________

 Changes between 0.9.6 and 0.9.7  [xx XXX 2000]

  *) New SSLeay_version code SSLEAY_DIR to determine the compiled-in
     value of OPENSSLDIR.  This is available via the new '-d' option
     to 'openssl version', and is also included in 'openssl version -a'.
     [Bodo Moeller]

  *) Fix C code generated by 'openssl dsaparam -C': If a BN_bin2bn
     call failed, free the DSA structure.
     [Bodo Moeller]

  *) Add another call level for memory allocation routines, thereby
     allowing memory allocation callbacks that can be given file
     name and line number information.  The basic functionality
     remains, as well as the original possibility to just replace
     malloc(), realloc() and free().  The new functions that can be
     registered help users provide variants of malloc(), realloc()
     and free() that take two extra arguments, a const char* and an
     int.  To register and find out the current settings for those
     hooks, the following functions are provided:

	CRYPTO_set_mem_ex_functions
	CRYPTO_set_locked_mem_ex_functions
	CRYPTO_get_mem_ex_functions
	CRYPTO_get_locked_mem_ex_functions

     They work the same way as the corresponding CRYPTO_set_mem_functions
     and friends with one exception: giving NULL as arguments will restore
     the internal hooks to internal routines and will still make the above
     functions return 1 and not 0.

     This functionality was created as a direct request to add the
     possibility to interface with the Windows debugging routines
     _malloc_dbg, _realloc_dbg and _free_dbg.
     [Richard Levitte]

  *) Fix to uni2asc() to cope with zero length Unicode strings.
     These are present in some PKCS#12 files.
     [Steve Henson]

  *) Finish off removing the remaining LHASH function pointer casts.
     There should no longer be any prototype-casting required when using
     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 an EGD or PRNGD is running and enough entropy is returned, automatic
     seeding like with /dev/[u]random will be performed.
     Positions tried are: /etc/entropy, /var/run/egd-pool.
     [Lutz Jaenicke]

  *) Change the Unix RAND_poll() variant to be able to poll several
     random devices and only read data for a small fragment of time
     to avoid hangs.  Also separate out the Unix variant to it's 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]

  *) Increase s2->wbuf allocation by one byte in ssl2_new (ssl/s2_lib.c).
     Otherwise do_ssl_write (ssl/s2_pkt.c) will write beyond buffer limits
     when writing a 32767 byte record.
     [Bodo Moeller; problem reported by Eric Day <eday@concentric.net>]

  *) In RSA_eay_public_{en,ed}crypt and RSA_eay_mod_exp (rsa_eay.c),
     obtain lock CRYPTO_LOCK_RSA before setting rsa->_method_mod_{n,p,q}.

     (RSA objects have a reference count access to which is protected
     by CRYPTO_LOCK_RSA [see rsa_lib.c, s3_srvr.c, ssl_cert.c, ssl_rsa.c],
     so they are meant to be shared between threads.)
     [Bodo Moeller, Geoff Thorpe; original patch submitted by
     "Reddie, Steven" <Steven.Reddie@ca.com>]

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

  *) Fix a deadlock in CRYPTO_mem_leaks().
     [Bodo Moeller]

  *) 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.