CHANGES

     (These simply call ..._new  and ..._copy).

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) Add binary polynomial arithmetic software in crypto/bn/bn_gf2m.c.
     Polynomials are represented as BIGNUMs (where the sign bit is not
     used) in the following functions [macros]:  

          BN_GF2m_add
          BN_GF2m_sub             [= BN_GF2m_add]
          BN_GF2m_mod             [wrapper for BN_GF2m_mod_arr]
          BN_GF2m_mod_mul         [wrapper for BN_GF2m_mod_mul_arr]
          BN_GF2m_mod_sqr         [wrapper for BN_GF2m_mod_sqr_arr]
          BN_GF2m_mod_inv
          BN_GF2m_mod_exp         [wrapper for BN_GF2m_mod_exp_arr]
          BN_GF2m_mod_sqrt        [wrapper for BN_GF2m_mod_sqrt_arr]
          BN_GF2m_mod_solve_quad  [wrapper for BN_GF2m_mod_solve_quad_arr]
          BN_GF2m_cmp             [= BN_ucmp]

     (Note that only the 'mod' functions are actually for fields GF(2^m).
     BN_GF2m_add() is misnomer, but this is for the sake of consistency.)

     For some functions, an the irreducible polynomial defining a
     field can be given as an 'unsigned int[]' with strictly
     decreasing elements giving the indices of those bits that are set;
     i.e., p[] represents the polynomial
          f(t) = t^p[0] + t^p[1] + ... + t^p[k]
     where
          p[0] > p[1] > ... > p[k] = 0.
     This applies to the following functions:

          BN_GF2m_mod_arr
          BN_GF2m_mod_mul_arr
          BN_GF2m_mod_sqr_arr
          BN_GF2m_mod_inv_arr        [wrapper for BN_GF2m_mod_inv]
          BN_GF2m_mod_div_arr        [wrapper for BN_GF2m_mod_div]
          BN_GF2m_mod_exp_arr
          BN_GF2m_mod_sqrt_arr
          BN_GF2m_mod_solve_quad_arr
          BN_GF2m_poly2arr
          BN_GF2m_arr2poly

     Conversion can be performed by the following functions:

          BN_GF2m_poly2arr
          BN_GF2m_arr2poly

     bntest.c has additional tests for binary polynomial arithmetic.

     Two implementations for BN_GF2m_mod_div() are available.
     The default algorithm simply uses BN_GF2m_mod_inv() and
     BN_GF2m_mod_mul().  The alternative algorithm is compiled in only
     if OPENSSL_SUN_GF2M_DIV is defined (patent pending; read the
     copyright notice in crypto/bn/bn_gf2m.c before enabling it).

     [Sheueling Chang Shantz and Douglas Stebila
     (Sun Microsystems Laboratories)]

  *) Add new error code 'ERR_R_DISABLED' that can be used when some
     functionality is disabled at compile-time.
     [Douglas Stebila <douglas.stebila@sun.com>]

  *) Change default behaviour of 'openssl asn1parse' so that more
     information is visible when viewing, e.g., a certificate:

     Modify asn1_parse2 (crypto/asn1/asn1_par.c) so that in non-'dump'
     mode the content of non-printable OCTET STRINGs is output in a
     style similar to INTEGERs, but with '[HEX DUMP]' prepended to
     avoid the appearance of a printable string.
     [Nils Larsch <nla@trustcenter.de>]

  *) Add 'asn1_flag' and 'asn1_form' member to EC_GROUP with access
     functions
          EC_GROUP_set_asn1_flag()
          EC_GROUP_get_asn1_flag()
          EC_GROUP_set_point_conversion_form()
          EC_GROUP_get_point_conversion_form()
     These control ASN1 encoding details:
     - Curves (i.e., groups) are encoded explicitly unless asn1_flag
       has been set to OPENSSL_EC_NAMED_CURVE.
     - Points are encoded in uncompressed form by default; options for
       asn1_for are as for point2oct, namely
          POINT_CONVERSION_COMPRESSED
          POINT_CONVERSION_UNCOMPRESSED
          POINT_CONVERSION_HYBRID

     Also add 'seed' and 'seed_len' members to EC_GROUP with access
     functions
          EC_GROUP_set_seed()
          EC_GROUP_get0_seed()
          EC_GROUP_get_seed_len()
     This is used only for ASN1 purposes (so far).
     [Nils Larsch <nla@trustcenter.de>]

  *) Add 'field_type' member to EC_METHOD, which holds the NID
     of the appropriate field type OID.  The new function
     EC_METHOD_get_field_type() returns this value.
     [Nils Larsch <nla@trustcenter.de>]

  *) Add functions 
          EC_POINT_point2bn()
          EC_POINT_bn2point()
          EC_POINT_point2hex()
          EC_POINT_hex2point()
     providing useful interfaces to EC_POINT_point2oct() and
     EC_POINT_oct2point().
     [Nils Larsch <nla@trustcenter.de>]

  *) Change internals of the EC library so that the functions
          EC_GROUP_set_generator()
          EC_GROUP_get_generator()
          EC_GROUP_get_order()
          EC_GROUP_get_cofactor()
     are implemented directly in crypto/ec/ec_lib.c and not dispatched
     to methods, which would lead to unnecessary code duplication when
     adding different types of curves.
     [Nils Larsch <nla@trustcenter.de> with input by Bodo Moeller]

  *) Implement compute_wNAF (crypto/ec/ec_mult.c) without BIGNUM
     arithmetic, and such that modified wNAFs are generated
     (which avoid length expansion in many cases).
     [Bodo Moeller]

  *) Add a function EC_GROUP_check_discriminant() (defined via
     EC_METHOD) that verifies that the curve discriminant is non-zero.

     Add a function EC_GROUP_check() that makes some sanity tests
     on a EC_GROUP, its generator and order.  This includes
     EC_GROUP_check_discriminant().
     [Nils Larsch <nla@trustcenter.de>]

  *) Add ECDSA in new directory crypto/ecdsa/.

     Add applications 'openssl ecparam' and 'openssl ecdsa'
     (these are based on 'openssl dsaparam' and 'openssl dsa').

     ECDSA support is also included in various other files across the
     library.  Most notably,
     - 'openssl req' now has a '-newkey ecdsa:file' option;
     - EVP_PKCS82PKEY (crypto/evp/evp_pkey.c) now can handle ECDSA;
     - X509_PUBKEY_get (crypto/asn1/x_pubkey.c) and
       d2i_PublicKey (crypto/asn1/d2i_pu.c) have been modified to make
       them suitable for ECDSA where domain parameters must be
       extracted before the specific public key;
     - ECDSA engine support has been added.
     [Nils Larsch <nla@trustcenter.de>]

  *) Include some named elliptic curves, and add OIDs from X9.62,
     SECG, and WAP/WTLS.  Each curve can be obtained from the new
     function
          EC_GROUP_new_by_curve_name(),
     and the list of available named curves can be obtained with
          EC_get_builtin_curves().
     Also add a 'curve_name' member to EC_GROUP objects, which can be
     accessed via
         EC_GROUP_set_curve_name()
         EC_GROUP_get_curve_name()
     [Nils Larsch <larsch@trustcenter.de, Bodo Moeller]
 
  *) 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]

 Changes between 0.9.7m and 0.9.7n  [xx XXX xxxx]

  *) In the SSL/TLS server implementation, be strict about session ID
     context matching (which matters if an application uses a single
     external cache for different purposes).  Previously,
     out-of-context reuse was forbidden only if SSL_VERIFY_PEER was
     set.  This did ensure strict client verification, but meant that,
     with applications using a single external cache for quite
     different requirements, clients could circumvent ciphersuite
     restrictions for a given session ID context by starting a session
     in a different context.
     [Bodo Moeller]

 Changes between 0.9.7l and 0.9.7m  [23 Feb 2007]

  *) Cleanse PEM buffers before freeing them since they may contain 
     sensitive data.
     [Benjamin Bennett <ben@psc.edu>]

  *) Include "!eNULL" in SSL_DEFAULT_CIPHER_LIST to make sure that
     a ciphersuite string such as "DEFAULT:RSA" cannot enable
     authentication-only ciphersuites.
     [Bodo Moeller]

  *) Since AES128 and AES256 share a single mask bit in the logic of
     ssl/ssl_ciph.c, the code for masking out disabled ciphers needs a
     kludge to work properly if AES128 is available and AES256 isn't.
     [Victor Duchovni]

  *) Expand security boundary to match 1.1.1 module.
     [Steve Henson]

  *) Remove redundant features: hash file source, editing of test vectors
     modify fipsld to use external fips_premain.c signature.
     [Steve Henson]

  *) New perl script mkfipsscr.pl to create shell scripts or batch files to
     run algorithm test programs.
     [Steve Henson]

  *) Make algorithm test programs more tolerant of whitespace.
     [Steve Henson]

  *) Have SSL/TLS server implementation tolerate "mismatched" record
     protocol version while receiving ClientHello even if the
     ClientHello is fragmented.  (The server can't insist on the
     particular protocol version it has chosen before the ServerHello
     message has informed the client about his choice.)
     [Bodo Moeller]

  *) Load error codes if they are not already present instead of using a
     static variable. This allows them to be cleanly unloaded and reloaded.
     [Steve Henson]

 Changes between 0.9.7k and 0.9.7l  [28 Sep 2006]

  *) Introduce limits to prevent malicious keys being able to
     cause a denial of service.  (CVE-2006-2940)
     [Steve Henson, Bodo Moeller]

  *) Fix ASN.1 parsing of certain invalid structures that can result
     in a denial of service.  (CVE-2006-2937)  [Steve Henson]

  *) Fix buffer overflow in SSL_get_shared_ciphers() function. 
     (CVE-2006-3738) [Tavis Ormandy and Will Drewry, Google Security Team]

  *) Fix SSL client code which could crash if connecting to a
     malicious SSLv2 server.  (CVE-2006-4343)
     [Tavis Ormandy and Will Drewry, Google Security Team]

  *) Change ciphersuite string processing so that an explicit
     ciphersuite selects this one ciphersuite (so that "AES256-SHA"
     will no longer include "AES128-SHA"), and any other similar
     ciphersuite (same bitmap) from *other* protocol versions (so that
     "RC4-MD5" will still include both the SSL 2.0 ciphersuite and the
     SSL 3.0/TLS 1.0 ciphersuite).  This is a backport combining
     changes from 0.9.8b and 0.9.8d.
     [Bodo Moeller]

 Changes between 0.9.7j and 0.9.7k  [05 Sep 2006]

  *) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
     (CVE-2006-4339)  [Ben Laurie and Google Security Team]

  *) Change the Unix randomness entropy gathering to use poll() when
     possible instead of select(), since the latter has some
     undesirable limitations.
     [Darryl Miles via Richard Levitte and Bodo Moeller]

  *) Disable rogue ciphersuites:

      - SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")
      - SSLv3/TLSv1 0x00 0x61 ("EXP1024-RC2-CBC-MD5")
      - SSLv3/TLSv1 0x00 0x60 ("EXP1024-RC4-MD5")

     The latter two were purportedly from
     draft-ietf-tls-56-bit-ciphersuites-0[01].txt, but do not really
     appear there.

     Also deactive the remaining ciphersuites from
     draft-ietf-tls-56-bit-ciphersuites-01.txt.  These are just as
     unofficial, and the ID has long expired.
     [Bodo Moeller]

  *) Fix RSA blinding Heisenbug (problems sometimes occured on
     dual-core machines) and other potential thread-safety issues.
     [Bodo Moeller]

 Changes between 0.9.7i and 0.9.7j  [04 May 2006]

  *) Adapt fipsld and the build system to link against the validated FIPS
     module in FIPS mode.
     [Steve Henson]

  *) Fixes for VC++ 2005 build under Windows.
     [Steve Henson]

  *) Add new Windows build target VC-32-GMAKE for VC++. This uses GNU make 
     from a Windows bash shell such as MSYS. It is autodetected from the
     "config" script when run from a VC++ environment. Modify standard VC++
     build to use fipscanister.o from the GNU make build. 
     [Steve Henson]

 Changes between 0.9.7h and 0.9.7i  [14 Oct 2005]

  *) Wrapped the definition of EVP_MAX_MD_SIZE in a #ifdef OPENSSL_FIPS.
     The value now differs depending on if you build for FIPS or not.
     BEWARE!  A program linked with a shared FIPSed libcrypto can't be
     safely run with a non-FIPSed libcrypto, as it may crash because of
     the difference induced by this change.
     [Andy Polyakov]

 Changes between 0.9.7g and 0.9.7h  [11 Oct 2005]

  *) Remove the functionality of SSL_OP_MSIE_SSLV2_RSA_PADDING
     (part of SSL_OP_ALL).  This option used to disable the
     countermeasure against man-in-the-middle protocol-version
     rollback in the SSL 2.0 server implementation, which is a bad
     idea.  (CVE-2005-2969)

     [Bodo Moeller; problem pointed out by Yutaka Oiwa (Research Center
     for Information Security, National Institute of Advanced Industrial
     Science and Technology [AIST], Japan)]

  *) Minimal support for X9.31 signatures and PSS padding modes. This is
     mainly for FIPS compliance and not fully integrated at this stage.
     [Steve Henson]

  *) For DSA signing, unless DSA_FLAG_NO_EXP_CONSTTIME is set, perform
     the exponentiation using a fixed-length exponent.  (Otherwise,
     the information leaked through timing could expose the secret key
     after many signatures; cf. Bleichenbacher's attack on DSA with
     biased k.)
     [Bodo Moeller]

  *) Make a new fixed-window mod_exp implementation the default for
     RSA, DSA, and DH private-key operations so that the sequence of
     squares and multiplies and the memory access pattern are
     independent of the particular secret key.  This will mitigate
     cache-timing and potential related attacks.

     BN_mod_exp_mont_consttime() is the new exponentiation implementation,
     and this is automatically used by BN_mod_exp_mont() if the new flag
     BN_FLG_EXP_CONSTTIME is set for the exponent.  RSA, DSA, and DH
     will use this BN flag for private exponents unless the flag
     RSA_FLAG_NO_EXP_CONSTTIME, DSA_FLAG_NO_EXP_CONSTTIME, or
     DH_FLAG_NO_EXP_CONSTTIME, respectively, is set.

     [Matthew D Wood (Intel Corp), with some changes by Bodo Moeller]

  *) Change the client implementation for SSLv23_method() and
     SSLv23_client_method() so that is uses the SSL 3.0/TLS 1.0
     Client Hello message format if the SSL_OP_NO_SSLv2 option is set.
     (Previously, the SSL 2.0 backwards compatible Client Hello
     message format would be used even with SSL_OP_NO_SSLv2.)
     [Bodo Moeller]

  *) Add support for smime-type MIME parameter in S/MIME messages which some
     clients need.
     [Steve Henson]

  *) New function BN_MONT_CTX_set_locked() to set montgomery parameters in
     a threadsafe manner. Modify rsa code to use new function and add calls
     to dsa and dh code (which had race conditions before).
     [Steve Henson]

  *) Include the fixed error library code in the C error file definitions
     instead of fixing them up at runtime. This keeps the error code
     structures constant.
     [Steve Henson]

 Changes between 0.9.7f and 0.9.7g  [11 Apr 2005]

  [NB: OpenSSL 0.9.7h and later 0.9.7 patch levels were released after
  OpenSSL 0.9.8.]

  *) Fixes for newer kerberos headers. NB: the casts are needed because
     the 'length' field is signed on one version and unsigned on another
     with no (?) obvious way to tell the difference, without these VC++
     complains. Also the "definition" of FAR (blank) is no longer included
     nor is the error ENOMEM. KRB5_PRIVATE has to be set to 1 to pick up
     some needed definitions.
     [Steve Henson]

  *) Undo Cygwin change.
     [Ulf Möller]

  *) Added support for proxy certificates according to RFC 3820.
     Because they may be a security thread to unaware applications,
     they must be explicitely allowed in run-time.  See
     docs/HOWTO/proxy_certificates.txt for further information.
     [Richard Levitte]

 Changes between 0.9.7e and 0.9.7f  [22 Mar 2005]

  *) Use (SSL_RANDOM_VALUE - 4) bytes of pseudo random data when generating
     server and client random values. Previously
     (SSL_RANDOM_VALUE - sizeof(time_t)) would be used which would result in
     less random data when sizeof(time_t) > 4 (some 64 bit platforms).

     This change has negligible security impact because:

     1. Server and client random values still have 24 bytes of pseudo random
        data.

     2. Server and client random values are sent in the clear in the initial
        handshake.

     3. The master secret is derived using the premaster secret (48 bytes in
        size for static RSA ciphersuites) as well as client server and random
        values.

     The OpenSSL team would like to thank the UK NISCC for bringing this issue
     to our attention. 

     [Stephen Henson, reported by UK NISCC]

  *) Use Windows randomness collection on Cygwin.
     [Ulf Möller]

  *) Fix hang in EGD/PRNGD query when communication socket is closed
     prematurely by EGD/PRNGD.
     [Darren Tucker <dtucker@zip.com.au> via Lutz Jänicke, resolves #1014]

  *) Prompt for pass phrases when appropriate for PKCS12 input format.
     [Steve Henson]

  *) Back-port of selected performance improvements from development
     branch, as well as improved support for PowerPC platforms.
     [Andy Polyakov]

  *) Add lots of checks for memory allocation failure, error codes to indicate
     failure and freeing up memory if a failure occurs.
     [Nauticus Networks SSL Team <openssl@nauticusnet.com>, Steve Henson]

  *) Add new -passin argument to dgst.
     [Steve Henson]

  *) Perform some character comparisons of different types in X509_NAME_cmp:
     this is needed for some certificates that reencode DNs into UTF8Strings
     (in violation of RFC3280) and can't or wont issue name rollover
     certificates.
     [Steve Henson]

  *) Make an explicit check during certificate validation to see that
     the CA setting in each certificate on the chain is correct.  As a
     side effect always do the following basic checks on extensions,
     not just when there's an associated purpose to the check:

      - if there is an unhandled critical extension (unless the user
        has chosen to ignore this fault)
      - if the path length has been exceeded (if one is set at all)
      - that certain extensions fit the associated purpose (if one has
        been given)
     [Richard Levitte]

 Changes between 0.9.7d and 0.9.7e  [25 Oct 2004]

  *) Avoid a race condition when CRLs are checked in a multi threaded 
     environment. This would happen due to the reordering of the revoked
     entries during signature checking and serial number lookup. Now the
     encoding is cached and the serial number sort performed under a lock.
     Add new STACK function sk_is_sorted().
     [Steve Henson]

  *) Add Delta CRL to the extension code.
     [Steve Henson]

  *) Various fixes to s3_pkt.c so alerts are sent properly.
     [David Holmes <d.holmes@f5.com>]

  *) Reduce the chances of duplicate issuer name and serial numbers (in
     violation of RFC3280) using the OpenSSL certificate creation utilities.
     This is done by creating a random 64 bit value for the initial serial
     number when a serial number file is created or when a self signed
     certificate is created using 'openssl req -x509'. The initial serial
     number file is created using 'openssl x509 -next_serial' in CA.pl
     rather than being initialized to 1.
     [Steve Henson]

 Changes between 0.9.7c and 0.9.7d  [17 Mar 2004]

  *) Fix null-pointer assignment in do_change_cipher_spec() revealed           
     by using the Codenomicon TLS Test Tool (CVE-2004-0079)                    
     [Joe Orton, Steve Henson]   

  *) Fix flaw in SSL/TLS handshaking when using Kerberos ciphersuites
     (CVE-2004-0112)
     [Joe Orton, Steve Henson]   

  *) 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.
     [Richard Levitte]

  *) X509 verify fixes. Disable broken certificate workarounds when 
     X509_V_FLAGS_X509_STRICT is set. Check CRL issuer has cRLSign set if
     keyUsage extension present. Don't accept CRLs with unhandled critical
     extensions: since verify currently doesn't process CRL extensions this
     rejects a CRL with *any* critical extensions. Add new verify error codes
     for these cases.
     [Steve Henson]

  *) When creating an OCSP nonce use an OCTET STRING inside the extnValue.
     A clarification of RFC2560 will require the use of OCTET STRINGs and 
     some implementations cannot handle the current raw format. Since OpenSSL
     copies and compares OCSP nonces as opaque blobs without any attempt at
     parsing them this should not create any compatibility issues.
     [Steve Henson]

  *) New md flag EVP_MD_CTX_FLAG_REUSE this allows md_data to be reused when
     calling EVP_MD_CTX_copy_ex() to avoid calling OPENSSL_malloc(). Without
     this HMAC (and other) operations are several times slower than OpenSSL
     < 0.9.7.
     [Steve Henson]

  *) Print out GeneralizedTime and UTCTime in ASN1_STRING_print_ex().
     [Peter Sylvester <Peter.Sylvester@EdelWeb.fr>]

  *) Use the correct content when signing type "other".
     [Steve Henson]

 Changes between 0.9.7b and 0.9.7c  [30 Sep 2003]

  *) Fix various bugs revealed by running the NISCC test suite:

     Stop out of bounds reads in the ASN1 code when presented with
     invalid tags (CVE-2003-0543 and CVE-2003-0544).
     
     Free up ASN1_TYPE correctly if ANY type is invalid (CVE-2003-0545).

     If verify callback ignores invalid public key errors don't try to check
     certificate signature with the NULL public key.

     [Steve Henson]

  *) New -ignore_err option in ocsp application to stop the server
     exiting on the first error in a request.
     [Steve Henson]

  *) In ssl3_accept() (ssl/s3_srvr.c) only accept a client certificate
     if the server requested one: as stated in TLS 1.0 and SSL 3.0
     specifications.
     [Steve Henson]

  *) In ssl3_get_client_hello() (ssl/s3_srvr.c), tolerate additional
     extra data after the compression methods not only for TLS 1.0
     but also for SSL 3.0 (as required by the specification).
     [Bodo Moeller; problem pointed out by Matthias Loepfe]

  *) Change X509_certificate_type() to mark the key as exported/exportable
     when it's 512 *bits* long, not 512 bytes.
     [Richard Levitte]

  *) Change AES_cbc_encrypt() so it outputs exact multiple of
     blocks during encryption.
     [Richard Levitte]

  *) Various fixes to base64 BIO and non blocking I/O. On write 
     flushes were not handled properly if the BIO retried. On read
     data was not being buffered properly and had various logic bugs.
     This also affects blocking I/O when the data being decoded is a
     certain size.
     [Steve Henson]

  *) Various S/MIME bugfixes and compatibility changes:
     output correct application/pkcs7 MIME type if
     PKCS7_NOOLDMIMETYPE is set. Tolerate some broken signatures.
     Output CR+LF for EOL if PKCS7_CRLFEOL is set (this makes opening
     of files as .eml work). Correctly handle very long lines in MIME
     parser.
     [Steve Henson]

 Changes between 0.9.7a and 0.9.7b  [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]

  *) Fixed a typo bug that would cause ENGINE_set_default() to set an
     ENGINE as defaults for all supported algorithms irrespective of
     the 'flags' parameter. 'flags' is now honoured, so applications
     should make sure they are passing it correctly.
     [Geoff Thorpe]

  *) Target "mingw" now allows native Windows code to be generated in
     the Cygwin environment as well as with the MinGW compiler.
     [Ulf Moeller] 

 Changes between 0.9.7 and 0.9.7a  [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. (CVE-2003-0078)

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

  *) Make the no-err option work as intended.  The intention with no-err
     is not to have the whole error stack handling routines removed from
     libcrypto, it's only intended to remove all the function name and
     reason texts, thereby removing some of the footprint that may not
     be interesting if those errors aren't displayed anyway.

     NOTE: it's still possible for any application or module to have it's
     own set of error texts inserted.  The routines are there, just not
     used by default when no-err is given.
     [Richard Levitte]

  *) Add support for FreeBSD on IA64.
     [dirk.meyer@dinoex.sub.org via Richard Levitte, resolves #454]

  *) Adjust DES_cbc_cksum() so it returns the same value as the MIT
     Kerberos function mit_des_cbc_cksum().  Before this change,
     the value returned by DES_cbc_cksum() was like the one from
     mit_des_cbc_cksum(), except the bytes were swapped.
     [Kevin Greaney <Kevin.Greaney@hp.com> and Richard Levitte]

  *) Allow an application to disable the automatic SSL chain building.
     Before this a rather primitive chain build was always performed in
     ssl3_output_cert_chain(): an application had no way to send the 
     correct chain if the automatic operation produced an incorrect result.

     Now the chain builder is disabled if either:

     1. Extra certificates are added via SSL_CTX_add_extra_chain_cert().

     2. The mode flag SSL_MODE_NO_AUTO_CHAIN is set.

     The reasoning behind this is that an application would not want the
     auto chain building to take place if extra chain certificates are
     present and it might also want a means of sending no additional
     certificates (for example the chain has two certificates and the
     root is omitted).
     [Steve Henson]

  *) Add the possibility to build without the ENGINE framework.
     [Steven Reddie <smr@essemer.com.au> via Richard Levitte]

  *) Under Win32 gmtime() can return NULL: check return value in
     OPENSSL_gmtime(). Add error code for case where gmtime() fails.
     [Steve Henson]

  *) DSA routines: under certain error conditions uninitialized BN objects
     could be freed. Solution: make sure initialization is performed early
     enough. (Reported and fix supplied by Ivan D Nestlerode <nestler@MIT.EDU>,
     Nils Larsch <nla@trustcenter.de> via PR#459)
     [Lutz Jaenicke]

  *) Another fix for SSLv2 session ID handling: the session ID was incorrectly
     checked on reconnect on the client side, therefore session resumption
     could still fail with a "ssl session id is different" error. This
     behaviour is masked when SSL_OP_ALL is used due to
     SSL_OP_MICROSOFT_SESS_ID_BUG being set.
     Behaviour observed by Crispin Flowerday <crispin@flowerday.cx> as
     followup to PR #377.
     [Lutz Jaenicke]

  *) IA-32 assembler support enhancements: unified ELF targets, support
     for SCO/Caldera platforms, fix for Cygwin shared build.
     [Andy Polyakov]

  *) Add support for FreeBSD on sparc64.  As a consequence, support for
     FreeBSD on non-x86 processors is separate from x86 processors on
     the config script, much like the NetBSD support.
     [Richard Levitte & Kris Kennaway <kris@obsecurity.org>]

 Changes between 0.9.6h and 0.9.7  [31 Dec 2002]

  [NB: OpenSSL 0.9.6i and later 0.9.6 patch levels were released after
  OpenSSL 0.9.7.]

  *) Fix session ID handling in SSLv2 client code: the SERVER FINISHED
     code (06) was taken as the first octet of the session ID and the last
     octet was ignored consequently. As a result SSLv2 client side session
     caching could not have worked due to the session ID mismatch between
     client and server.
     Behaviour observed by Crispin Flowerday <crispin@flowerday.cx> as
     PR #377.
     [Lutz Jaenicke]

  *) Change the declaration of needed Kerberos libraries to use EX_LIBS
     instead of the special (and badly supported) LIBKRB5.  LIBKRB5 is
     removed entirely.
     [Richard Levitte]

  *) The hw_ncipher.c engine requires dynamic locks.  Unfortunately, it
     seems that in spite of existing for more than a year, many application
     author have done nothing to provide the necessary callbacks, which
     means that this particular engine will not work properly anywhere.
     This is a very unfortunate situation which forces us, in the name
     of usability, to give the hw_ncipher.c a static lock, which is part
     of libcrypto.
     NOTE: This is for the 0.9.7 series ONLY.  This hack will never
     appear in 0.9.8 or later.  We EXPECT application authors to have
     dealt properly with this when 0.9.8 is released (unless we actually
     make such changes in the libcrypto locking code that changes will
     have to be made anyway).
     [Richard Levitte]

  *) In asn1_d2i_read_bio() repeatedly call BIO_read() until all content
     octets have been read, EOF or an error occurs. Without this change
     some truncated ASN1 structures will not produce an error.
     [Steve Henson]

  *) Disable Heimdal support, since it hasn't been fully implemented.
     Still give the possibility to force the use of Heimdal, but with
     warnings and a request that patches get sent to openssl-dev.
     [Richard Levitte]

  *) Add the VC-CE target, introduce the WINCE sysname, and add
     INSTALL.WCE and appropriate conditionals to make it build.
     [Steven Reddie <smr@essemer.com.au> via Richard Levitte]

  *) Change the DLL names for Cygwin to cygcrypto-x.y.z.dll and
     cygssl-x.y.z.dll, where x, y and z are the major, minor and
     edit numbers of the version.
     [Corinna Vinschen <vinschen@redhat.com> and Richard Levitte]

  *) Introduce safe string copy and catenation functions
     (BUF_strlcpy() and BUF_strlcat()).
     [Ben Laurie (CHATS) and Richard Levitte]

  *) Avoid using fixed-size buffers for one-line DNs.
     [Ben Laurie (CHATS)]

  *) Add BUF_MEM_grow_clean() to avoid information leakage when
     resizing buffers containing secrets, and use where appropriate.
     [Ben Laurie (CHATS)]

  *) Avoid using fixed size buffers for configuration file location.
     [Ben Laurie (CHATS)]

  *) Avoid filename truncation for various CA files.
     [Ben Laurie (CHATS)]

  *) Use sizeof in preference to magic numbers.
     [Ben Laurie (CHATS)]

  *) Avoid filename truncation in cert requests.
     [Ben Laurie (CHATS)]

  *) Add assertions to check for (supposedly impossible) buffer
     overflows.
     [Ben Laurie (CHATS)]

  *) Don't cache truncated DNS entries in the local cache (this could
     potentially lead to a spoofing attack).
     [Ben Laurie (CHATS)]

  *) Fix various buffers to be large enough for hex/decimal
     representations in a platform independent manner.
     [Ben Laurie (CHATS)]

  *) Add CRYPTO_realloc_clean() to avoid information leakage when
     resizing buffers containing secrets, and use where appropriate.
     [Ben Laurie (CHATS)]

  *) Add BIO_indent() to avoid much slightly worrying code to do
     indents.
     [Ben Laurie (CHATS)]

  *) Convert sprintf()/BIO_puts() to BIO_printf().
     [Ben Laurie (CHATS)]

  *) buffer_gets() could terminate with the buffer only half
     full. Fixed.
     [Ben Laurie (CHATS)]

  *) Add assertions to prevent user-supplied crypto functions from
     overflowing internal buffers by having large block sizes, etc.
     [Ben Laurie (CHATS)]

  *) New OPENSSL_assert() macro (similar to assert(), but enabled
     unconditionally).
     [Ben Laurie (CHATS)]

  *) Eliminate unused copy of key in RC4.
     [Ben Laurie (CHATS)]

  *) Eliminate unused and incorrectly sized buffers for IV in pem.h.
     [Ben Laurie (CHATS)]

  *) Fix off-by-one error in EGD path.
     [Ben Laurie (CHATS)]

  *) If RANDFILE path is too long, ignore instead of truncating.
     [Ben Laurie (CHATS)]

  *) Eliminate unused and incorrectly sized X.509 structure
     CBCParameter.
     [Ben Laurie (CHATS)]

  *) Eliminate unused and dangerous function knumber().
     [Ben Laurie (CHATS)]

  *) Eliminate unused and dangerous structure, KSSL_ERR.
     [Ben Laurie (CHATS)]

  *) Protect against overlong session ID context length in an encoded
     session object. Since these are local, this does not appear to be
     exploitable.
     [Ben Laurie (CHATS)]

  *) Change from security patch (see 0.9.6e below) that did not affect
     the 0.9.6 release series:

     Remote buffer overflow in SSL3 protocol - an attacker could
     supply an oversized master key in Kerberos-enabled versions.
     (CVE-2002-0657)
     [Ben Laurie (CHATS)]

  *) Change the SSL kerb5 codes to match RFC 2712.
     [Richard Levitte]

  *) Make -nameopt work fully for req and add -reqopt switch.
     [Michael Bell <michael.bell@rz.hu-berlin.de>, Steve Henson]

  *) The "block size" for block ciphers in CFB and OFB mode should be 1.
     [Steve Henson, reported by Yngve Nysaeter Pettersen <yngve@opera.com>]

  *) Make sure tests can be performed even if the corresponding algorithms
     have been removed entirely.  This was also the last step to make
     OpenSSL compilable with DJGPP under all reasonable conditions.
     [Richard Levitte, Doug Kaufman <dkaufman@rahul.net>]

  *) Add cipher selection rules COMPLEMENTOFALL and COMPLEMENTOFDEFAULT
     to allow version independent disabling of normally unselected ciphers,
     which may be activated as a side-effect of selecting a single cipher.

     (E.g., cipher list string "RSA" enables ciphersuites that are left
     out of "ALL" because they do not provide symmetric encryption.
     "RSA:!COMPLEMEMENTOFALL" avoids these unsafe ciphersuites.)
     [Lutz Jaenicke, Bodo Moeller]

  *) Add appropriate support for separate platform-dependent build
     directories.  The recommended way to make a platform-dependent
     build directory is the following (tested on Linux), maybe with
     some local tweaks:

	# Place yourself outside of the OpenSSL source tree.  In
	# this example, the environment variable OPENSSL_SOURCE
	# is assumed to contain the absolute OpenSSL source directory.
	mkdir -p objtree/"`uname -s`-`uname -r`-`uname -m`"
	cd objtree/"`uname -s`-`uname -r`-`uname -m`"
	(cd $OPENSSL_SOURCE; find . -type f) | while read F; do
		mkdir -p `dirname $F`
		ln -s $OPENSSL_SOURCE/$F $F
	done

     To be absolutely sure not to disturb the source tree, a "make clean"
     is a good thing.  If it isn't successfull, don't worry about it,
     it probably means the source directory is very clean.
     [Richard Levitte]

  *) Make sure any ENGINE control commands make local copies of string
     pointers passed to them whenever necessary. Otherwise it is possible
     the caller may have overwritten (or deallocated) the original string
     data when a later ENGINE operation tries to use the stored values.
     [Götz Babin-Ebell <babinebell@trustcenter.de>]

  *) Improve diagnostics in file reading and command-line digests.
     [Ben Laurie aided and abetted by Solar Designer <solar@openwall.com>]

  *) Add AES modes CFB and OFB to the object database.  Correct an
     error in AES-CFB decryption.
     [Richard Levitte]

  *) Remove most calls to EVP_CIPHER_CTX_cleanup() in evp_enc.c, this 
     allows existing EVP_CIPHER_CTX structures to be reused after
     calling EVP_*Final(). This behaviour is used by encryption
     BIOs and some applications. This has the side effect that
     applications must explicitly clean up cipher contexts with
     EVP_CIPHER_CTX_cleanup() or they will leak memory.
     [Steve Henson]

  *) Check the values of dna and dnb in bn_mul_recursive before calling
     bn_mul_comba (a non zero value means the a or b arrays do not contain
     n2 elements) and fallback to bn_mul_normal if either is not zero.
     [Steve Henson]

  *) Fix escaping of non-ASCII characters when using the -subj option
     of the "openssl req" command line tool. (Robert Joop <joop@fokus.gmd.de>)
     [Lutz Jaenicke]

  *) Make object definitions compliant to LDAP (RFC2256): SN is the short
     form for "surname", serialNumber has no short form.
     Use "mail" as the short name for "rfc822Mailbox" according to RFC2798;
     therefore remove "mail" short name for "internet 7".
     The OID for unique identifiers in X509 certificates is
     x500UniqueIdentifier, not uniqueIdentifier.
     Some more OID additions. (Michael Bell <michael.bell@rz.hu-berlin.de>)
     [Lutz Jaenicke]

  *) Add an "init" command to the ENGINE config module and auto initialize
     ENGINEs. Without any "init" command the ENGINE will be initialized 
     after all ctrl commands have been executed on it. If init=1 the 
     ENGINE is initailized at that point (ctrls before that point are run
     on the uninitialized ENGINE and after on the initialized one). If
     init=0 then the ENGINE will not be iniatialized at all.
     [Steve Henson]

  *) Fix the 'app_verify_callback' interface so that the user-defined
     argument is actually passed to the callback: In the
     SSL_CTX_set_cert_verify_callback() prototype, the callback
     declaration has been changed from
          int (*cb)()
     into
          int (*cb)(X509_STORE_CTX *,void *);
     in ssl_verify_cert_chain (ssl/ssl_cert.c), the call
          i=s->ctx->app_verify_callback(&ctx)
     has been changed into
          i=s->ctx->app_verify_callback(&ctx, s->ctx->app_verify_arg).

     To update applications using SSL_CTX_set_cert_verify_callback(),
     a dummy argument can be added to their callback functions.
     [D. K. Smetters <smetters@parc.xerox.com>]

  *) Added the '4758cca' ENGINE to support IBM 4758 cards.
     [Maurice Gittens <maurice@gittens.nl>, touchups by Geoff Thorpe]

  *) Add and OPENSSL_LOAD_CONF define which will cause
     OpenSSL_add_all_algorithms() to load the openssl.cnf config file.
     This allows older applications to transparently support certain
     OpenSSL features: such as crypto acceleration and dynamic ENGINE loading.
     Two new functions OPENSSL_add_all_algorithms_noconf() which will never
     load the config file and OPENSSL_add_all_algorithms_conf() which will
     always load it have also been added.
     [Steve Henson]

  *) Add the OFB, CFB and CTR (all with 128 bit feedback) to AES.
     Adjust NIDs and EVP layer.
     [Stephen Sprunk <stephen@sprunk.org> and Richard Levitte]

  *) Config modules support in openssl utility.

     Most commands now load modules from the config file,
     though in a few (such as version) this isn't done 
     because it couldn't be used for anything.

     In the case of ca and req the config file used is
     the same as the utility itself: that is the -config
     command line option can be used to specify an
     alternative file.
     [Steve Henson]

  *) Move default behaviour from OPENSSL_config(). If appname is NULL
     use "openssl_conf" if filename is NULL use default openssl config file.
     [Steve Henson]

  *) Add an argument to OPENSSL_config() to allow the use of an alternative
     config section name. Add a new flag to tolerate a missing config file
     and move code to CONF_modules_load_file().
     [Steve Henson]

  *) Support for crypto accelerator cards from Accelerated Encryption
     Processing, www.aep.ie.  (Use engine 'aep')
     The support was copied from 0.9.6c [engine] and adapted/corrected
     to work with the new engine framework.
     [AEP Inc. and Richard Levitte]

  *) Support for SureWare crypto accelerator cards from Baltimore
     Technologies.  (Use engine 'sureware')
     The support was copied from 0.9.6c [engine] and adapted
     to work with the new engine framework.
     [Richard Levitte]

  *) Have the CHIL engine fork-safe (as defined by nCipher) and actually
     make the newer ENGINE framework commands for the CHIL engine work.
     [Toomas Kiisk <vix@cyber.ee> and Richard Levitte]

  *) Make it possible to produce shared libraries on ReliantUNIX.
     [Robert Dahlem <Robert.Dahlem@ffm2.siemens.de> via Richard Levitte]

  *) Add the configuration target debug-linux-ppro.
     Make 'openssl rsa' use the general key loading routines
     implemented in apps.c, and make those routines able to
     handle the key format FORMAT_NETSCAPE and the variant
     FORMAT_IISSGC.
     [Toomas Kiisk <vix@cyber.ee> via Richard Levitte]

 *) Fix a crashbug and a logic bug in hwcrhk_load_pubkey().
     [Toomas Kiisk <vix@cyber.ee> via Richard Levitte]

  *) Add -keyform to rsautl, and document -engine.
     [Richard Levitte, inspired by Toomas Kiisk <vix@cyber.ee>]