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 OpenSSL CHANGES
 Changes between 0.9.5a and 0.9.6  [xx XXX 2000]
Bodo Möller's avatar
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  *) In ssl23_get_client_hello, generate an error message when faced
     with an initial SSL 3.0/TLS record that is too small to contain the
     first two bytes of the ClientHello message, i.e. client_version.
     (Note that this is a pathologic case that probably has never happened
     in real life.)  The previous approach was to use the version number
     from the record header as a subsitute; but our protocol choice
     should not depend on that one because it is not authenticated
     by the Finished messages.
     [Bodo Moeller]

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  *) For compatibility reasons if the flag X509_V_FLAG_ISSUER_CHECK is
     not set then we don't setup the error code for issuer check errors
     to avoid possibly overwriting other errors which the callback does
     handle. If an application does set the flag then we assume it knows
     what it is doing and can handle the new informational codes
     appropriately.
     [Steve Henson]

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  *) Fix for a nasty bug in ASN1_TYPE handling. ASN1_TYPE is used for
     a general "ANY" type, as such it should be able to decode anything
     including tagged types. However it didn't check the class so it would
     wrongly interpret tagged types in the same way as their universal
     counterpart and unknown types were just rejected. Changed so that the
     tagged and unknown types are handled in the same way as a SEQUENCE:
     that is the encoding is stored intact. There is also a new type
     "V_ASN1_OTHER" which is used when the class is not universal, in this
     case we have no idea what the actual type is so we just lump them all
     together.
     [Steve Henson]

  *) On VMS, stdout may very well lead to a file that is written to
     in a record-oriented fashion.  That means that every write() will
     write a separate record, which will be read separately by the
     programs trying to read from it.  This can be very confusing.

     The solution is to put a BIO filter in the way that will buffer
     text until a linefeed is reached, and then write everything a
     line at a time, so every record written will be an actual line,
     not chunks of lines and not (usually doesn't happen, but I've
     seen it once) several lines in one record.  BIO_f_linebuffer() is
     the answer.

     Currently, it's a VMS-only method, because that's where it has
     been tested well enough.
     [Richard Levitte]

  *) Remove 'optimized' squaring variant in BN_mod_mul_montgomery,
     it can return incorrect results.
     (Note: The buggy variant was not enabled in OpenSSL 0.9.5a,
     but it was in 0.9.6-beta[12].)
     [Bodo Moeller]

  *) Disable the check for content being present when verifying detached
     signatures in pk7_smime.c. Some versions of Netscape (wrongly)
     include zero length content when signing messages.
     [Steve Henson]

  *) New BIO_shutdown_wr macro, which invokes the BIO_C_SHUTDOWN_WR
     BIO_ctrl (for BIO pairs).

  *) Add DSO method for VMS.
     [Richard Levitte]

  *) Bug fix: Montgomery multiplication could produce results with the
     wrong sign.
     [Ulf Möller]

  *) Add RPM specification openssl.spec and modify it to build three
     packages.  The default package contains applications, application
     documentation and run-time libraries.  The devel package contains
     include files, static libraries and function documentation.  The
     doc package contains the contents of the doc directory.  The original
     openssl.spec was provided by Damien Miller <djm@mindrot.org>.
     [Richard Levitte]
     
  *) Add a large number of documentation files for many SSL routines.
     [Lutz Jaenicke <Lutz.Jaenicke@aet.TU-Cottbus.DE>]

  *) Add a configuration entry for Sony News 4.
     [NAKAJI Hiroyuki <nakaji@tutrp.tut.ac.jp>]

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  *) Don't set the two most significant bits to one when generating a
     random number < q in the DSA library.
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  *) New SSL API mode 'SSL_MODE_AUTO_RETRY'.  This disables the default
     behaviour that SSL_read may result in SSL_ERROR_WANT_READ (even if
     the underlying transport is blocking) if a handshake took place.
     (The default behaviour is needed by applications such as s_client
     and s_server that use select() to determine when to use SSL_read;
     but for applications that know in advance when to expect data, it
     just makes things more complicated.)
     [Bodo Moeller]

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  *) Add RAND_egd_bytes(), which gives control over the number of bytes read
     from EGD.
     [Ben Laurie]

  *) Add a few more EBCDIC conditionals that make `req' and `x509'
     work better on such systems.
     [Martin Kraemer <Martin.Kraemer@MchP.Siemens.De>]

  *) Add two demo programs for PKCS12_parse() and PKCS12_create().
     Update PKCS12_parse() so it copies the friendlyName and the
     keyid to the certificates aux info.
     [Steve Henson]

  *) Fix bug in PKCS7_verify() which caused an infinite loop
     if there was more than one signature.
     [Sven Uszpelkat <su@celocom.de>]

  *) Major change in util/mkdef.pl to include extra information
     about each symbol, as well as presentig variables as well
     as functions.  This change means that there's n more need
     to rebuild the .num files when some algorithms are excluded.
     [Richard Levitte]

Dr. Stephen Henson's avatar
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  *) Allow the verify time to be set by an application,
     rather than always using the current time.
     [Steve Henson]
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  *) Phase 2 verify code reorganisation. The certificate
     verify code now looks up an issuer certificate by a
     number of criteria: subject name, authority key id
     and key usage. It also verifies self signed certificates
     by the same criteria. The main comparison function is
     X509_check_issued() which performs these checks.
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     Lot of changes were necessary in order to support this
     without completely rewriting the lookup code.
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     Authority and subject key identifier are now cached.
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     The LHASH 'certs' is X509_STORE has now been replaced
     by a STACK_OF(X509_OBJECT). This is mainly because an
     LHASH can't store or retrieve multiple objects with
     the same hash value.
Dr. Stephen Henson's avatar
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     As a result various functions (which were all internal
     use only) have changed to handle the new X509_STORE
     structure. This will break anything that messed round
     with X509_STORE internally.
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     The functions X509_STORE_add_cert() now checks for an
     exact match, rather than just subject name.
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     The X509_STORE API doesn't directly support the retrieval
     of multiple certificates matching a given criteria, however
     this can be worked round by performing a lookup first
     (which will fill the cache with candidate certificates)
     and then examining the cache for matches. This is probably
     the best we can do without throwing out X509_LOOKUP
     entirely (maybe later...).
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     The X509_VERIFY_CTX structure has been enhanced considerably.
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     All certificate lookup operations now go via a get_issuer()
     callback. Although this currently uses an X509_STORE it
     can be replaced by custom lookups. This is a simple way
     to bypass the X509_STORE hackery necessary to make this
     work and makes it possible to use more efficient techniques
     in future. A very simple version which uses a simple
     STACK for its trusted certificate store is also provided
     using X509_STORE_CTX_trusted_stack().
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     The verify_cb() and verify() callbacks now have equivalents
     in the X509_STORE_CTX structure.
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     X509_STORE_CTX also has a 'flags' field which can be used
     to customise the verify behaviour.
     [Steve Henson]
  *) Add new PKCS#7 signing option PKCS7_NOSMIMECAP which 
     excludes S/MIME capabilities.
     [Steve Henson]

  *) When a certificate request is read in keep a copy of the
     original encoding of the signed data and use it when outputing
     again. Signatures then use the original encoding rather than
     a decoded, encoded version which may cause problems if the
     request is improperly encoded.
     [Steve Henson]

Bodo Möller's avatar
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  *) For consistency with other BIO_puts implementations, call
     buffer_write(b, ...) directly in buffer_puts instead of calling
     BIO_write(b, ...).
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     In BIO_puts, increment b->num_write as in BIO_write.
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     [Peter.Sylvester@EdelWeb.fr]

  *) Fix BN_mul_word for the case where the word is 0. (We have to use
     BN_zero, we may not return a BIGNUM with an array consisting of
     words set to zero.)
     [Bodo Moeller]
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