Spiped (pronounced "ess-pipe-dee") is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses, so that one may connect to one address (e.g., a UNIX socket on localhost) and transparently have a connection established to another address (e.g., a UNIX socket on a different system). This is similar to 'ssh -L' functionality, but does not use SSH and requires a pre-shared symmetric key. Spiped uses strong and well-understood cryptographic components: The initial key negotiation is performed using HMAC-SHA256 and an authenticated Diffie-Hellman key exchange over the standard 2048-bit "group 14"; following the completion of key negotiation, packets are transmitted encrypted with AES-256 in CTR mode and authenticated using HMAC-SHA256.
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