core: Implement context flag "override-session-key".

* src/gpgme.c (gpgme_set_ctx_flag): Add flags "export-session-key" and
"override-session-key".
(gpgme_get_ctx_flag): Ditto.
(gpgme_set_export_session_keys): Remove.
(gpgme_get_export_session_keys): Remove.
* src/gpgme.def, src/libgpgme.vers: Remove them.
* src/context.h (struct gpgme_context): Add field
override_session_key.
* src/decrypt-verify.c (decrypt_verify_start): Pass
override_session_key value to the engine.
* src/decrypt.c (decrypt_start): Ditto.
* src/engine.c (_gpgme_engine_op_decrypt): Ditto.
(_gpgme_engine_op_decrypt_verify): Ditto.
* src/engine-backend.h (struct engine_ops): Extend DECRYPT and
DECRYPT_VERIFY_START with override_session_key.
* src/engine-uiserver.c (_uiserver_decrypt): Add stub arg
override_session_key.
(uiserver_decrypt): Ditto.
(uiserver_decrypt_verify): Ditto.
* src/engine-gpgsm.c (gpgsm_decrypt): Ditto.
* src/engine-gpg.c (gpg_decrypt): Add arg override_session_key and set
corresponding gpg option.

* tests/run-decrypt.c (print_result): Print the session key if
available.
(main): Add options --export-session-key and --override-session-key.

--

To keep the number of context manipulation functions at bay, this
patches removes the just added gpgme_set_export_session_keys and
gpgme_get_export_session_keys by flags for the generic context
function.

The patch also implements the --override-session-key feature.

GnuPG-bug-id: 2754
Signed-off-by: Werner Koch <[email protected]>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/engine-gpg.c b/src/engine-gpg.c
index 0e43c248..21ed5bc3 100644
--- a/src/engine-gpg.c
+++ b/src/engine-gpg.c
@@ -1550,7 +1550,8 @@ add_input_size_hint (engine_gpg_t gpg, gpgme_data_t data)
 
 
 static gpgme_error_t
-gpg_decrypt (void *engine, gpgme_data_t ciph, gpgme_data_t plain, int export_session_key)
+gpg_decrypt (void *engine, gpgme_data_t ciph, gpgme_data_t plain,
+             int export_session_key, const char *override_session_key)
 {
   engine_gpg_t gpg = engine;
   gpgme_error_t err;
@@ -1560,6 +1561,13 @@ gpg_decrypt (void *engine, gpgme_data_t ciph, gpgme_data_t plain, int export_ses
   if (!err && export_session_key)
     err = add_arg (gpg, "--show-session-key");
 
+  if (!err && override_session_key && *override_session_key)
+    {
+      err = add_arg (gpg, "--override-session-key");
+      if (!err)
+        err = add_arg (gpg, override_session_key);
+    }
+
   /* Tell the gpg object about the data.  */
   if (!err)
     err = add_arg (gpg, "--output");