omshell doesn't work with HMAC-SHA512 in Red Hat Enterprise Linux 8

Issue

• The omshell command has key-algorithm command to specify the key algorithm, which was introduced by RHBA-2021:1623.
• The omshell man page has the description that HMAC-SHA512 is supported.

key-algorithm algorithm
    This specifies the cryptographic algorithm for the key used when authenticating OMAPI transactions. Supported values for algorithm are:
               HMAC-MD5
               HMAC-SHA1
               HMAC-SHA224
               HMAC-SHA256
               HMAC-SHA384
               HMAC-SHA512
    The default is HMAC-MD5. (Value is not case sensitive).

• But, it still works with HMAC-MD5 only.
• It outputs the following error when HMAC-SHA512 is used.

can't open object: invalid argument