Store the incoming and outgoing secrets separately.

api/net/sf/briar/api/crypto/CryptoComponent.java

api/net/sf/briar/api/db/DatabaseComponent.java

api/net/sf/briar/api/transport/ConnectionReaderFactory.java

api/net/sf/briar/api/transport/ConnectionWriterFactory.java

components/net/sf/briar/crypto/CryptoComponentImpl.java

components/net/sf/briar/crypto/SharedSecret.java

components/net/sf/briar/db/Database.java

components/net/sf/briar/db/DatabaseComponentImpl.java

components/net/sf/briar/db/JdbcDatabase.java

...s/net/sf/briar/transport/ConnectionReaderFactoryImpl.java

...ents/net/sf/briar/transport/ConnectionRecogniserImpl.java

...s/net/sf/briar/transport/ConnectionWriterFactoryImpl.java

...net/sf/briar/transport/batch/IncomingBatchConnection.java

...net/sf/briar/transport/batch/OutgoingBatchConnection.java

...t/sf/briar/transport/stream/IncomingStreamConnection.java

...t/sf/briar/transport/stream/OutgoingStreamConnection.java

test/build.xml

test/net/sf/briar/ProtocolIntegrationTest.java

test/net/sf/briar/crypto/CryptoComponentTest.java

test/net/sf/briar/crypto/SharedSecretTest.java