pull up r23734 from trunk

pull up r23734 from trunk

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 r23734 | ghudson | 2010-02-18 13:04:47 -0500 (Thu, 18 Feb 2010) | 17 lines

 ticket: 6665
 subject: Fix cipher state chaining in OpenSSL back end
 target_version: 1.8
 tags: pullup

 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.

ticket: 6665
version_fixed: 1.8
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-8@23746 dc483132-0cff-0310-8789-dd5450dbe970