agent: Allow to use SETHASH for arbitrary data.

* agent/agent.h (struct server_control_s): Add field digest.data.
* agent/gpg-agent.c (agent_deinit_default_ctrl): Free that field.
* agent/command.c (reset_notify): Ditto.
(start_command_handler): ditto.
(cmd_sethash): Add new option --inquire.
* agent/call-scd.c (agent_card_pksign): For now return an error if
inquire mode was used.
* agent/command-ssh.c (ssh_handler_sign_request): Make sure
digest.data is cleared.
* agent/divert-scd.c (divert_pksign): Implement inquire mode.
* agent/pksign.c (agent_pksign_do): Ditto.
--

This is required to support EdDSA according to RFC8410.

GnuPG-bug-id: 4888

1 files changed, 5 insertions, 0 deletions

diff --git a/agent/pksign.c b/agent/pksign.c
index 3474f9434..76b0c3f85 100644
--- a/agent/pksign.c
+++ b/agent/pksign.c
@@ -304,6 +304,11 @@ agent_pksign_do (ctrl_t ctrl, const char *cache_nonce,
       data = overridedata;
       datalen = overridedatalen;
     }
+  else if (ctrl->digest.data)
+    {
+      data = ctrl->digest.data;
+      datalen = ctrl->digest.valuelen;
+    }
   else
     {
       data = ctrl->digest.value;