* src/gpgme.h.in (gpgme_op_tofu_policy_start): New function.
(gpgme_op_tofu_policy): New function.
* src/libgpgme.vers, src/gpgme.def: Add new functions.
* src/tofupolicy.c: New.
* src/Makefile.am (main_sources): Add that file.
* src/context.h (ctx_op_data_id_t): Add OPDATA_TOFU_POLICY.
* src/engine.c (_gpgme_engine_op_tofu_policy): New.
* src/engine-backend.h (engine_ops): Add funcptr 'tofu_policy'.
Adjust all engine initializations.
* src/engine-gpg.c (gpg_tofu_policy): New.
(_gpgme_engine_ops_gpg): Register this function.
* tests/run-tofu.c: New.
* tests/Makefile.am (noinst_PROGRAMS): Add it.