This macro makes creating OSSL_ALGORITHM structures from rust code
easier.

Signed-off-by: Tomás González <[email protected]>

Start implemententing the keymgmt functions:

 * parsec_provider_query now returns the function table for
   OSSL_OP_KEYMGMT
 * Implement OSSL_FUNC_keymgmt_new, returning a dummy Key Object.

Signed-off-by: Tomás González <[email protected]>

Signed-off-by: Tomás González <[email protected]>

The only settable parameters for a Key Object Context should be
PARSEC_PROVIDER_KEY_NAME.

Signed-off-by: Tomás González <[email protected]>

Implement the OSSL_FUNC_KEYMGMT_SET_PARAMS, where the only parameter
to be set is the key name, PARSEC_PROVIDER_KEY_NAME.

Signed-off-by: Tomás González <[email protected]>

Signed-off-by: Tomás González <[email protected]>

Implement:

 1. OSSL_FUNC_KEYMGMT_HAS

for key objects as indicated by
https://www.openssl.org/docs/man3.0/man7/provider-keymgmt.html

This currently only checks whether selection is
'OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS' and the key_name has been
filled, as currently we don't support any other selection/data
in Key Objects.

Signed-off-by: Tomás González <[email protected]>