Always compare the return value to 0, don't use cute tricks like
if (!strcmp(...)).

provided by Andrew.

which is the case at least on some Solaris versions.  Marko Kreen

Few cleanups and couple of new things:

 - add SHA2 algorithm to older OpenSSL
 - add BIGNUM math to have public-key cryptography work on non-OpenSSL
   build.
 - gen_random_bytes() function

The status of SHA2 algoritms and public-key encryption can now be
changed to 'always available.'

That makes pgcrypto functionally complete and unless there will be new
editions of AES, SHA2 or OpenPGP standards, there is no major changes
planned.

pgcrypto crypt()/md5 and hmac() leak memory when compiled against
OpenSSL as openssl.c digest ->reset will do two DigestInit calls
against a context.  This happened to work with OpenSSL 0.9.6
but not with 0.9.7+.

Reason for the messy code was that I tried to avoid creating
wrapper structure to transport algorithm info and tried to use
OpenSSL context for it.  The fix is to create wrapper structure.

It also uses newer digest API to avoid memory allocations
on reset with newer OpenSSLs.

Thanks to Daniel Blaisdell for reporting it.

compiler warnings.  Marko Kreen and Kris Jurka.

be more wary about having a value for BYTE_ORDER, clean up randomly-
chosen ways of including Postgres core headers.
Marko Kreen and Tom Lane

Marko Kreen

OpenSSL 0.9.6x.  The DES functions use the older 'des_'
API, but the newer 3DES functions use the 0.9.7x-only
'DES_' API.

I think I just used /usr/include/openssl/des.h for reference
when implementing them, and had upgraded OpenSSL in the
meantime.

Following patch converts DES also to newer API and provides
compatibility functions for OpenSSL < 0.9.7.

I chose this route because:

- openssl.c uses few DES functions.
- compatibility for old 'des_' API is going away at some point
  of time from OpenSSL.
- as seen from macros, new API is saner
- Thus pgcrypto supports any OpenSSL version from 0.9.5 to 1.0

Tested with OpenSSL 0.9.6c and 0.9.7e.

Marko Kreen

- Move openssl random provider to openssl.c and builtin provider
  to internal.c
- Make px_random_bytes use Fortuna, instead of giving error.
- Retarget random.c to aquiring system randomness, for initial seeding
  of Fortuna.  There is ATM 2 functions for Windows,
  reader from /dev/urandom and the regular time()/getpid() silliness.

Marko Kreen

auto-detection of AES.

Now openssl.c just checks OpenSSL version.  Whoever compiles
newer OpenSSL without AES is on his own.

Marko Kreen

(currently in beta) when cryptolib = openssl.  According to the
following checkin message from several years ago, OpenSSL application
developers should no longer rely on <openssl/evp.h> to include
everything they need:

http://cvs.openssl.org/chngview?cn=9888

This patch adds the necessary header files.  It doesn't appear to
break anything when building against OpenSSL 0.9.7.

BTW, core appears to build and work fine with OpenSSL 0.9.8.  I've
built 7.3 through HEAD against 0.9.8-beta6 without noticing any
problems.

Michael Fuhr

* openssl.c: Add 3des and AES support
* README.pgcrypto: list only supported ciphers for openssl

OpenSSL has pre-processor symbol OPENSSL_NO_AES, which
isn't that helpful for detecting if it _does_ exist.
Thus the hack with AES_ENCRYPT.

Marko Kreen

* Use error codes instead of -1
* px_strerror for new error codes
* calling convention change for px_gen_salt - return error code
* use px_strerror in pgcrypto.c

Marko Kreen

  It was a bad style to begin with, and now several loops can be clearer.
* pgcrypto.c: Fix function comments
* crypt-gensalt.c, crypt-blowfish.c: stop messing with errno
* openssl.c: use px_free instead pfree
* px.h: make redefining px_alloc/px_realloc/px_free easier

Marko Kreen

0.9.7x have EVP_DigestFinal function which which clears all of
EVP_MD_CTX.  This makes pgcrypto crash in functions which
re-use one digest context several times: hmac() and crypt()
with md5 algorithm.

Following patch fixes it by carring the digest info around
EVP_DigestFinal and re-initializing cipher.

Marko Kreen.

make sure the $Id tags are converted to $PostgreSQL as well ...

is pgcrypto bug as it assumed too much about inner workings of OpenSSL.

Following patch stops pgcrypto using EVP* functions for ciphers and lets
it manage ciphers itself.

This patch supports Blowfish, DES and CAST5 algorithms.

Marko Kreen

should be all.

Marko Kreen

failures on FreeBSD.  This patch replaces uint -> unsigned.

This was reported by Daniel Holtzman against 0.4pre3 standalone
package, but it needs fixing in contrib/pgcrypto too.

Marko Kreen

initdb/regression tests pass.

spacing.  Also adds space for one-line comments.

tests pass.

salt generation code.  He also urged using better random source
and making possible to choose using bcrypt and xdes rounds more
easily.  So, here's patch:

* For all salt generation, use Solar Designer's own code.  This
  is mostly due fact that his code is more fit for get_random_bytes()
  style interface.
* New function: gen_salt(type, rounds).  This lets specify iteration
  count for algorithm.
* random.c: px_get_random_bytes() function.
  Supported randomness soure: /dev/urandom, OpenSSL PRNG, libc random()
  Default: /dev/urandom.
* Draft description of C API for pgcrypto functions.

New files: API, crypt-gensalt.c, random.c

Marko Kreen

* remove support for encode() as it is in main tree now
* remove krb5.c
* new 'PX library' architecture
* remove BSD license from my code to let the general
  PostgreSQL one to apply
* md5, sha1: ANSIfy, use const where appropriate
* various other formatting and clarity changes
* hmac()
* UN*X-like crypt() - system or internal crypt
* Internal crypt: DES, Extended DES, MD5, Blowfish
  crypt-des.c, crypt-md5.c from FreeBSD
  crypt-blowfish.c from Solar Designer
* gen_salt() for crypt() -  Blowfish, MD5, DES, Extended DES
* encrypt(), decrypt(), encrypt_iv(), decrypt_iv()
* Cipher support in mhash.c, openssl.c
* internal: Blowfish, Rijndael-128 ciphers
* blf.[ch], rijndael.[ch] from OpenBSD
* there will be generated file rijndael-tbl.inc.

Marko Kreen

are now separate files "postgres.h" and "postgres_fe.h", which are meant
to be the primary include files for backend .c files and frontend .c files
respectively.  By default, only include files meant for frontend use are
installed into the installation include directory.  There is a new make
target 'make install-all-headers' that adds the whole content of the
src/include tree to the installed fileset, for use by people who want to
develop server-side code without keeping the complete source tree on hand.
Cleaned up a whole lot of crufty and inconsistent header inclusions.