lukechilds/lightning - lightning - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Rusty Russell	74f294e36c	daemon: encrypted communication (version 3) After useful feedback from Anthony Towns and Mats Jerratsch (of thunder.network fame), this is the third version of inter-node crypto. 1) First, each side sends a 33-byte session pubkey. This is a bitcoin-style compressed EC key, unique for each session. 2) ECDH is used to derive a shared secret. From this we generate the following transmission encoding parameters for each side: Session AES-128 key: SHA256(shared-secret \|\| my-sessionpubkey \|\| 0) Session HMAC key: SHA256(shared-secret \|\| my-sessionpubkey \|\| 1) IV for AES: SHA256(shared-secret \|\| my-sessionpubkey \|\| 2) 3) All packets from then on are encrypted of form: /* HMAC, covering totlen and data / struct sha256 hmac; / Total data transmitted (including this). / le64 totlen; / Encrypted contents, rounded up to 16 byte boundary. */ u8 data[]; 4) The first packet is an Authenticate protobuf, containing this node's pubkey, and a bitcoin-style EC signature of the other side's session pubkey. 5) Unknown protobuf fields are handled in the protocol as follows (including in the initial Authenticate packet): 1) Odd numbered fields are optional, and backwards compatible. 2) Even numbered fields are required; abort if you get one. Currently both sides just send an error packet "hello" after the handshake, and make sure they receive the same. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>	9 years ago
Rusty Russell	2df28021ac	daemon: command to connect Now we can connect two daemons to each other. Who both say Hello! and close. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>	9 years ago
Rusty Russell	e4224f72d4	daemon: netaddr Structure for a net address. We can expand it later to cover exotic address types (Tor?). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>	9 years ago
Rusty Russell	469401610f	daemon: socket code. At the moment, if you connect it just says Hello! and closes the socket. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>	9 years ago