[age restriction] progress 12/n

- taler-offline-tool now handles extensions
  - command "extensions" added with subcommands "show" and "sign"
  - parses extensions from taler config
  - shows and signs of extensions and their configurations
  - creates signed set of configurations for upload
  - added test for retrieval of extension config

- simplified signature verification for extensions
  - remove per-extension signatures, also from DB schema
  - adjust prepared statements accordingly
  - adjust DB event handler for extensions
  - allow NULL for config for extension in DB schema
  - handler for /management/extensions adjusted to new datastructures

- changed test for TALER_denom_blind/TALER_denom_sign_blinded with and
  without TALER_AgeHash

- minor updates and various fixes

1 files changed, 2 insertions, 5 deletions

diff --git a/src/exchangedb/exchange-0001.sql b/src/exchangedb/exchange-0001.sql
index 51fd26eca..a8e79335b 100644
--- a/src/exchangedb/exchange-0001.sql
+++ b/src/exchangedb/exchange-0001.sql
@@ -297,17 +297,14 @@ COMMENT ON TABLE signkey_revocations
 CREATE TABLE IF NOT EXISTS extensions
   (extension_id BIGSERIAL UNIQUE
   ,name VARCHAR NOT NULL UNIQUE
-  ,config BYTEA NOT NULL
-  ,config_sig BYTEA NOT NULL
+  ,config BYTEA
   );
 COMMENT ON TABLE extensions
   IS 'Configurations of the activated extensions';
 COMMENT ON COLUMN extensions.name
   IS 'Name of the extension';
 COMMENT ON COLUMN extensions.config
-  IS 'Configuration of the extension as JSON-blob';
-COMMENT ON COLUMN extensions.config
-  IS 'Signature of the configuration of an extension, signed with the master key of the exchange';
+  IS 'Configuration of the extension as JSON-blob, maybe NULL';
 
 
 CREATE TABLE IF NOT EXISTS known_coins