Make cipher state chaining work in the OpenSSL back end for des, des3,
and arcfour enc providers.  Subtleties:

* DES and DES3 have checks to avoid clobbering ivec with uninitialized
  data if there is no data to encrypt.
* Arcfour saves the OpenSSL cipher context across calls.  To protect
  against a caller improperly copying the state (which happens to work
  with other enc providers), a loopback pointer is used, as in GSSAPI.
* EVP_EncryptFinal_ex is unnecessary with stream ciphers and would
  interfere with cipher state chaining if it did anything, so just
  remove it.


https://github.com/krb5/krb5/commit/07fb1e7b435ce005fe629be07d05de912d61307f
Commit By: ghudson
Revision: 23734
Changed Files:
U   trunk/src/lib/crypto/openssl/enc_provider/des.c
U   trunk/src/lib/crypto/openssl/enc_provider/des3.c
U   trunk/src/lib/crypto/openssl/enc_provider/rc4.c