P2p crypto - #1
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- introduce new crypto layer - introduce security association (key, context) into peer_info - set up dummy keys until we have key negotiation and derivation You need to install gnutls >2.99 into n2nv2/gnutls, if you don't have it installed on your system.
- introduce symmetric p2p packet encryption and authentication - key are constant zero
Conflicts: n2n_v2/crypto.c n2n_v2/crypto.h n2n_v2/edge.c n2n_v2/n2n.c n2n_v2/n2n.h
- AES256 in GCM mode seems not to be supported by gnutls right now - improved debug output
- fix peer lookup for SA lookup - fix sending non-encrypted packets
traffic encryption seems to provied basic functionality
Conflicts: .gitignore n2n_v2/crypto.c n2n_v2/crypto.h n2n_v2/edge.c n2n_v2/n2n.c n2n_v2/n2n.h
- we use HKDF, a scheme based on HMAC - added some references
- introduce a session key derivation scheme called HKDF, which is designed for derivation of symmetric keys out of DH shared secrets - changed overhead defines to prefix AEAD_
- introduce the ECDH key exchange - works in principle, but is untested in this form
- new error control (macro) - move aes/session/SA functions out of core
- wipe keys - fix length check
- move master keys to hmac.c - compute and verify HMAC tags - doc: handshake packets are recognized by the special SPI zero
- dependencies - special SPI zero
finished outline of packet decoding replaced underscores in packet types with hyphens for consistency
- removed obsolete hanshake syn-ack section - changed 0 denotes handshake to 0 denotes non-payload
and: libgcrypt version check improved, few comments added/changed
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