This is a message from the IBM SSL implementation to indicate that the SHA-512 algorithm is not available.  If the fix described below has been applied to IBM System SSL, the message can be turned off by setting the GSK_SSL_HW_DETECT_MESSAGE environment variable to 0:

http://www-1.ibm.com/support/docview.wss?uid=isg1OA25022

OA25022: SYSTEM SSL: SHA-512 CRYPTO ASSIST IS NOT AVAILABLE MESSAGE IS SEEN IN STRERR EVEN WITH GSK_SSL_HW_DETECT_MESSAGE=0.

APAR status
Closed as program error.

Error description
The message 'System SSL: SHA-512 crypto assist is not available'
is seen in stderr even if the Environment variable
GSK_SSL_HW_DETECT_MESSAGE is coded as a 0.

The problem is the { } brackets are missing in the following
If Statement, so the SHA-512 message will always be written.
  if (detect_messages)
    fprintf(stderr, "System SSL: SHA-384 crypto assist is not
available\n");
    fprintf(stderr, "System SSL: SHA-512 crypto assist is not
available\n");

Local fix

Problem summary
****************************************************************
* USERS AFFECTED: Users of System SSL that have applied new    *
*                 function APAR OA22451.                       *
****************************************************************
* PROBLEM DESCRIPTION: SHA-512 hardware detection message      *
*                      displays to user.                       *
****************************************************************
* RECOMMENDATION: APPLY PTF                                    *
****************************************************************
The message is output by new code introduced by the addition of
the new function - support for the SHA-512 digest algorithm.
During hardware detection the new code outputs a new message to
the stderr interface advising that "SHA-512 crypto assist is not
available" when SHA-512 support is not detected through CPACF.
The message is correct, but is output regardless of the
GSK_SSL_HW_DETECT_MESSAGE environment variable setting, which
the message reporting would normally depend on.
Problem conclusion
PROBLEM CONCLUSION:                                    col 64->|
System SSL has been modified so that during hardware detection,
if SHA-512 support is not detected, then the message "SHA-512
crypto assist is not available" is only output to stderr if the
GSK_SSL_HW_DETECT_MESSAGE environment variable is set to do so.
-
*--------------------------------------------------------------*
* The following defect is included in this fix:                *
*                                                              *
* 2296 HW Detection message always output - SHA-512 not        *
*      available                                               *
*--------------------------------------------------------------*