dsa_mod_exp() and bn_mod_exp() handlers from dsa_do_verify() and
dsa_sign_setup(). When another DSA_METHOD implementation does not define
these lower-level handlers, it becomes impossible to do a fallback to
software on errors using a simple DSA_OpenSSL()->fn(key).

This change allows the default DSA_METHOD to function in such circumstances
by only using dsa_mod_exp() and bn_mod_exp() handlers if they exist,
otherwise using BIGNUM implementations directly (which is what those
handlers did before this change). There should be no noticable difference
for the software case, or indeed any custom case that didn't already
segfault, except perhaps that there is now one less level of indirection in
all cases.

PR: 507

- bugfix: in ECDH_compute_key, pad x coordinate with leading zeros if necessary

PR: 343

Two fixes:

1. If BIO_write() fails inside enc_write() it should return the
   total number of bytes successfully written.

2. If BIO_write() fails during BIO_flush() it should return immediately
   with the error code: previously it would fall through to the final
   encrypt, corrupting the buffer.

the buffer pointer.

Rename PKCS7_PARTSIGN to PKCS7_STREAM.

Guess what that's for :-)

rearrange some of the other text for better readability.

This is needed because Windows doesn't support symlinks.

The Cygwin/MinGW build now passes "make test".

under cygwin.

when reading from a non blocking BIO.

It would incorrectly interpret retries as EOF, incorrectly
buffer initial data and have no buffering at all after initial
data (data would be sent one byte at a time to EVP_DecodeUpdate).

conventions.

behaviour was not quite consistent with the conventions
for d2i and i2d functions as far as handling of the 'out'
or 'in' pointer is concerned.

This patch changes this behaviour, and renames the functions to
o2i_ECPublicKey and i2o_ECPublicKey (not 'd2i' and 'i2d' because the
external encoding is just a raw object string without any DER icing).

Submitted by: Nils Larsch

For some reason it was disabled...

if the write fails when flushing the buffer return the
value to the application so it can retry.

PR: 511
Submitted by: Eric Cronin

An advisory will be posted to the web.  Expect a release within the hour.

Reportedly this option is deprecated, and on some systems
"make test" fails if it is included.

PR: 495

elements directly, so this missing functionality is required.

PR: 276

be cast later on.