sm: Exclude rsaPSS from de-vs compliance mode.

* common/compliance.h (PK_ALGO_FLAG_RSAPSS): New.
* common/compliance.c (gnupg_pk_is_compliant): Add arg alog_flags and
test rsaPSS.  Adjust all callers.
* common/util.c (pubkey_algo_to_string): New.
(gnupg_pk_is_allowed): Ditto.
* sm/misc.c (gpgsm_ksba_cms_get_sig_val): New wrapper function.
(gpgsm_get_hash_algo_from_sigval): New.
* sm/certcheck.c (gpgsm_check_cms_signature): Change type of sigval
arg.  Add arg pkalgoflags.  Use the PK_ALGO_FLAG_RSAPSS.
* sm/verify.c (gpgsm_verify): Use the new wrapper and new fucntion to
also get the algo flags.  Pass algo flags along.  Change some of the
info output to be more like current master.
--
Signed-off-by: Werner Koch <wk@gnupg.org>

This backport from master
commit 969abcf40c
also includes some changes taken from
commit a759fa963a
(sm: Improve readability of the data verification output.)

Signed-off-by: Werner Koch <wk@gnupg.org>

common/compliance.h

@@ -48,11 +48,17 @@ enum pk_use_case
     PK_USE_SIGNING, PK_USE_VERIFICATION,
   };
 
+/* Flags to distinguish public key algorithm variants.  */
+#define PK_ALGO_FLAG_RSAPSS 1    /* Use rsaPSS padding. */
+
+
 int gnupg_pk_is_compliant (enum gnupg_compliance_mode compliance, int algo,
+                           unsigned int algo_flags,
                            gcry_mpi_t key[], unsigned int keylength,
                            const char *curvename);
 int gnupg_pk_is_allowed (enum gnupg_compliance_mode compliance,
-                         enum pk_use_case use, int algo, gcry_mpi_t key[],
+                         enum pk_use_case use, int algo,
+                         unsigned int algo_flags, gcry_mpi_t key[],
                          unsigned int keylength, const char *curvename);
 int gnupg_cipher_is_compliant (enum gnupg_compliance_mode compliance,
                                cipher_algo_t cipher,