e65760ca85
This commit adds basic syncing capabilities with peers if they are both online. It updates the work done on MVDS, but I decided to create the code in status-go instead, since it's very tight to the application (similarly the code that was the inspiration for mvds, bramble, is all tight together at the database level). I reused parts of the protobufs. The flow is: 1) An OFFER message is sent periodically with a bunch of message-ids and group-ids. 2) Anyone can REQUEST some of those messages if not present in their database. 3) The peer will then send over those messages. It's disabled by default, but I am planning to add a way to set up the flags.
go-sqlcipher
Description
Self-contained Go sqlite3 driver with an AES-256 encrypted sqlite3 database conforming to the built-in database/sql interface. It is based on:
- Go sqlite3 driver: https://github.com/mattn/go-sqlite3
- SQLite extension with AES-256 codec: https://github.com/sqlcipher/sqlcipher
- AES-256 implementation from: https://github.com/libtom/libtomcrypt
SQLite itself is part of SQLCipher.
Incompatibilities of SQLCipher
The version tags of go-sqlcipher are the same as for SQLCipher.
SQLCipher 4.x is incompatible with SQLCipher 3.x!
go-sqlcipher does not implement any migration strategies at the moment. So if you upgrade a major version of go-sqlcipher, you yourself are responsible to upgrade existing database files.
See migrating databases for details.
To upgrade your Go code to the 4.x series, change the import path to
"github.com/mutecomm/go-sqlcipher/v4"
Installation
This package can be installed with the go get command:
go get github.com/mutecomm/go-sqlcipher
Documentation
To create and open encrypted database files use the following DSN parameters:
key := "2DD29CA851E7B56E4697B0E1F08507293D761A05CE4D1B628663F411A8086D99"
dbname := fmt.Sprintf("db?_pragma_key=x'%s'&_pragma_cipher_page_size=4096", key)
db, _ := sql.Open("sqlite3", dbname)
_pragma_key is the hex encoded 32 byte key (must be 64 characters long).
_pragma_cipher_page_size is the page size of the encrypted database (set if
you want a different value than the default size).
key := url.QueryEscape("secret")
dbname := fmt.Sprintf("db?_pragma_key=%s&_pragma_cipher_page_size=4096", key)
db, _ := sql.Open("sqlite3", dbname)
This uses a passphrase directly as _pragma_key with the key derivation function in
SQLCipher. Do not forget the url.QueryEscape() call in your code!
See also PRAGMA key.
API documentation can be found here: http://godoc.org/github.com/mutecomm/go-sqlcipher
Use the function sqlite3.IsEncrypted() to check whether a database file is encrypted or not.
Examples can be found under the ./_example directory
License
The code of the originating packages is covered by their respective licenses. See LICENSE file for details.