core: New flags GPGME_DECRYPT_UNWRAP and GPGME_ENCRYPT_WRAP.

* src/gpgme.h.in (GPGME_ENCRYPT_WRAP): New const.
(gpgme_decrypt_flags_t): New enum.
(GPGME_DECRYPT_VERIFY): New const
(GPGME_DECRYPT_UNWRAP): New const
(gpgme_op_decrypt_ext_start): New func.
(gpgme_op_decrypt_ext): New func.
* src/decrypt-verify.c (gpgme_op_decrypt_ext_start): New.
(gpgme_op_decrypt_ext): New.
(decrypt_verify_start): Add arg FLAGS.  Replace call to
engine_op_decrypt_verify by the plain decrypt with the flag set.
(gpgme_op_decrypt_verify_start): Pass the flag.
(gpgme_op_decrypt_verify): Pass the flag.
* src/decrypt.c (decrypt_start): Rename to ...
(_gpgme_decrypt_start): this.  Add arg FLAGS.  Pass FLAGS to
engine_op_decrypt.
(gpgme_op_decrypt_start): Adjust for chnage pass 0 for FLAG.
(gpgme_op_decrypt_start): Ditto.
* src/engine.c (_gpgme_engine_op_decrypt_verify): Remove.
(_gpgme_engine_op_decrypt): Add arg FLAGS.
* src/gpgme.def, src/libgpgme.vers: Add new functions.
* src/engine-backend.h (struct engine_ops): Remove member
'decrypt_verify'.  Add FLAGS to 'decrypt'.  Adjust all initialization.
* src/engine-uiserver.c (uiserver_decrypt): Remove.
(uiserver_decrypt_verify): Remove.
(_uiserver_decrypt): Rename to ...
(uiserver_decrypt): this.  Replace arg VERIFY by new arg FLAGS.
* src/engine-gpg.c (gpg_decrypt): Support GPGME_DECRYPT_UNWRAP.
(gpg_encrypt): Support GPGME_ENCRYPT_WRAP.

* tests/run-decrypt.c (main): New option --unwrap.
* tests/run-encrypt.c (main): New option --wrap.
--

Manual testing of that wrap/unwrap feature can be done this way:

 ./run-encrypt --verbose --key Alice /etc/motd > x
 ./run-decrypt --verbose --unwrap x > y
 ./run-encrypt --verbose --key Bob --wrap y > z

1. The message was first encrypted to Alice.
2. Alice decrypts the message receiving a valid OpenPGP message.
3. Alice encrypt that message to Bob

This will also work with encrypted and signed messages; the signature
will be kept intact during re-encryption.  Requires GnuPG 2.1.12.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 3 insertions, 4 deletions

diff --git a/src/engine-backend.h b/src/engine-backend.h
index 635acb06..53af6622 100644
--- a/src/engine-backend.h
+++ b/src/engine-backend.h
@@ -61,12 +61,11 @@ struct engine_ops
 					   void *fnc_value);
   gpgme_error_t (*set_locale) (void *engine, int category, const char *value);
   gpgme_error_t (*set_protocol) (void *engine, gpgme_protocol_t protocol);
-  gpgme_error_t (*decrypt) (void *engine, gpgme_data_t ciph,
+  gpgme_error_t (*decrypt) (void *engine,
+                            gpgme_decrypt_flags_t flags,
+                            gpgme_data_t ciph,
 			    gpgme_data_t plain, int export_session_key,
                             const char *override_session_key);
-  gpgme_error_t (*decrypt_verify) (void *engine, gpgme_data_t ciph,
-				   gpgme_data_t plain, int export_session_key,
-                                   const char *override_session_key);
   gpgme_error_t (*delete) (void *engine, gpgme_key_t key, int allow_secret);
   gpgme_error_t (*edit) (void *engine, int type, gpgme_key_t key,
 			 gpgme_data_t out, gpgme_ctx_t ctx /* FIXME */);