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 OpenSSL CHANGES
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 Changes between 0.9.4 and 0.9.5  [xx XXX 2000]

  *) Bugfix: ssl3_send_server_key_exchange was not restartable
     (the state was not changed to SSL3_ST_SW_KEY_EXCH_B, and because of
     this the server could overwrite ephemeral keys that the client
     has already seen).
     [Bodo Moeller]

  *) Turn DSA_is_prime into a macro that calls BN_is_prime,
     using 50 iterations of the Rabin-Miller test.

     DSA_generate_parameters now uses BN_is_prime_fasttest (with 50
     iterations of the Rabin-Miller test as required by the appendix
     to FIPS PUB 186[-1]) instead of DSA_is_prime.
     As BN_is_prime_fasttest includes trial division, DSA parameter
     generation becomes much faster.

     This implies a change for the callback functions in DSA_is_prime
     and DSA_generate_parameters: The callback function is called once
     for each positive witness in the Rabin-Miller test, not just
     occasionally in the inner loop; and the parameters to the
     callback function now provide an iteration count for the outer
     loop rather than for the current invocation of the inner loop.
     DSA_generate_parameters additionally can call the callback
     function with an 'iteration count' of -1, meaning that a
     candidate has passed the trial division test (when q is generated 
     from an application-provided seed, trial division is skipped).
  *) New function BN_is_prime_fasttest that optionally does trial
     division before starting the Rabin-Miller test and has
     an additional BN_CTX * argument (whereas BN_is_prime always
     has to allocate at least one BN_CTX).
     'callback(1, -1, cb_arg)' is called when a number has passed the
     trial division stage.
     [Bodo Moeller]
  *) Fix for bug in CRL encoding. The validity dates weren't being handled
     as ASN1_TIME.
     [Steve Henson]

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  *) New -pkcs12 option to CA.pl script to write out a PKCS#12 file.
     [Steve Henson]

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  *) New function BN_pseudo_rand().
     [Ulf Möller]
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  *) Clean up BN_mod_mul_montgomery(): replace the broken (and unreadable)
     bignum version of BN_from_montgomery() with the working code from
     SSLeay 0.9.0 (the word based version is faster anyway), and clean up
     the comments.
     [Ulf Möller]

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  *) Avoid a race condition in s2_clnt.c (function get_server_hello) that
     made it impossible to use the same SSL_SESSION data structure in
     SSL2 clients in multiple threads.
     [Bodo Moeller]

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  *) The return value of RAND_load_file() no longer counts bytes obtained
     by stat().  RAND_load_file(..., -1) is new and uses the complete file
     to seed the PRNG (previously an explicit byte count was required).
     [Ulf Möller, Bodo Möller]
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  *) Clean up CRYPTO_EX_DATA functions, some of these didn't have prototypes
     used (char *) instead of (void *) and had casts all over the place.
     [Steve Henson]

  *) Make BN_generate_prime() return NULL on error if ret!=NULL.
     [Ulf Möller]

  *) Retain source code compatibility for BN_prime_checks macro:
     BN_is_prime(..., BN_prime_checks, ...) now uses
     BN_prime_checks_for_size to determine the appropriate number of
     Rabin-Miller iterations.
     [Ulf Möller]

  *) Diffie-Hellman uses "safe" primes: DH_check() return code renamed to
     DH_CHECK_P_NOT_SAFE_PRIME.
     (Check if this is true? OpenPGP calls them "strong".)
     [Ulf Möller]

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  *) Merge the functionality of "dh" and "gendh" programs into a new program
     "dhparam". The old programs are retained for now but will handle DH keys
     (instead of parameters) in future.
     [Steve Henson]

  *) Make the ciphers, s_server and s_client programs check the return values
     when a new cipher list is set.
     [Steve Henson]

  *) Enhance the SSL/TLS cipher mechanism to correctly handle the TLS 56bit
     ciphers. Before when the 56bit ciphers were enabled the sorting was
     wrong.

     The syntax for the cipher sorting has been extended to support sorting by
     cipher-strength (using the strength_bits hard coded in the tables).
     The new command is "@STRENGTH" (see also doc/apps/ciphers.pod).

     Fix a bug in the cipher-command parser: when supplying a cipher command
     string with an "undefined" symbol (neither command nor alphanumeric
     [A-Za-z0-9], ssl_set_cipher_list used to hang in an endless loop. Now
     an error is flagged.

     Due to the strength-sorting extension, the code of the
     ssl_create_cipher_list() function was completely rearranged. I hope that
     the readability was also increased :-)
     [Lutz Jaenicke <Lutz.Jaenicke@aet.TU-Cottbus.DE>]
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  *) Minor change to 'x509' utility. The -CAcreateserial option now uses 1
     for the first serial number and places 2 in the serial number file. This
     avoids problems when the root CA is created with serial number zero and
     the first user certificate has the same issuer name and serial number
     as the root CA.
     [Steve Henson]

  *) Fixes to X509_ATTRIBUTE utilities, change the 'req' program so it uses
     the new code. Add documentation for this stuff.
     [Steve Henson]

  *) Changes to X509_ATTRIBUTE utilities. These have been renamed from
     X509_*() to X509at_*() on the grounds that they don't handle X509
     structures and behave in an analagous way to the X509v3 functions:
     they shouldn't be called directly but wrapper functions should be used
     instead.

     So we also now have some wrapper functions that call the X509at functions
     when passed certificate requests. (TO DO: similar things can be done with
     PKCS#7 signed and unsigned attributes, PKCS#12 attributes and a few other
     things. Some of these need some d2i or i2d and print functionality
     because they handle more complex structures.)
  *) Add missing #ifndefs that caused missing symbols when building libssl
     as a shared library without RSA.  Use #ifndef NO_SSL2 instead of
     NO_RSA in ssl/s2*.c. 
     [Kris Kennaway <kris@hub.freebsd.org>, modified by Ulf Möller]

  *) Precautions against using the PRNG uninitialized: RAND_bytes() now
     has a return value which indicates the quality of the random data
     (1 = ok, 0 = not seeded).  Also an error is recorded on the thread's
     error queue. New function RAND_pseudo_bytes() generates output that is
     guaranteed to be unique but not unpredictable.
  *) Do more iterations of Rabin-Miller probable prime test (specifically,
     3 for 1024-bit primes, 6 for 512-bit primes, 12 for 256-bit primes
     instead of only 2 for all lengths; see BN_prime_checks_for_size definition
     in crypto/bn/bn_prime.c for the complete table).  This guarantees a
     false-positive rate of at most 2^-80 for random input.
     [Bodo Moeller]

  *) Rewrite ssl3_read_n (ssl/s3_pkt.c) avoiding a couple of bugs.
  *) New function X509_CTX_rget_chain(), this returns the chain
     from an X509_CTX structure with a dup of the stack and all
     the X509 reference counts upped: so the stack will exist
     after X509_CTX_cleanup() has been called. Modify pkcs12.c
     to use this.

     Also make SSL_SESSION_print() print out the verify return
     code.
     [Steve Henson]

  *) Add manpage for the pkcs12 command. Also change the default
     behaviour so MAC iteration counts are used unless the new
     -nomaciter option is used. This improves file security and
     only older versions of MSIE (4.0 for example) need it.
     [Steve Henson]

  *) Honor the no-xxx Configure options when creating .DEF files.
     [Ulf Möller]

  *) Add PKCS#10 attributes to field table: challengePassword, 
     unstructuredName and unstructuredAddress. These are taken from
     draft PKCS#9 v2.0 but are compatible with v1.2 provided no 
     international characters are used.

     More changes to X509_ATTRIBUTE code: allow the setting of types
     based on strings. Remove the 'loc' parameter when adding
     attributes because these will be a SET OF encoding which is sorted
     in ASN1 order.
     [Steve Henson]

  *) Initial changes to the 'req' utility to allow request generation
     automation. This will allow an application to just generate a template
     file containing all the field values and have req construct the
     request.

     Initial support for X509_ATTRIBUTE handling. Stacks of these are
     used all over the place including certificate requests and PKCS#7
     structures. They are currently handled manually where necessary with
     some primitive wrappers for PKCS#7. The new functions behave in a
     manner analogous to the X509 extension functions: they allow
     attributes to be looked up by NID and added.

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