Add read-only support for rsaPSS.

Authored by werner on Apr 8 2020, 8:40 PM.

Description

Add read-only support for rsaPSS.

* src/ber-help.c (_ksba_parse_context_tag): Minor tweak in the
returned error codes.
* src/keyinfo.c (SUPPORTED_RSAPSS): New.
(pk_algo_table): Add rsaPSS.
(sig_algo_table): Add rsaPSS.
(put_stringbuf_uint): New.
(cryptval_to_sexp): Parse out the rsaPSS parameters.

Details