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authorDimitri Staessens <dimitri@ouroboros.rocks>2019-08-02 19:12:34 +0200
committerSander Vrijders <sander@ouroboros.rocks>2019-08-03 12:10:57 +0200
commit9e8d603d14561095fb8d08871319a315d3bf6763 (patch)
tree7a87c212fcd642a8696145b4246a4fc4cf964e10 /src/irmd/irm_flow.c
parent8a37ffbf8c0776a38f2de18a63e885383960ee68 (diff)
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lib: Add per-message encryption with OpenSSL
This adds a per-message symmetric encryption using the OpenSSL library. At flow allocation, an Elliptic Curve Diffie-Hellman exchange is performed to derive a shared secret, which is then hashed using SHA3-256 to be used as a key for symmetric AES-256 encryption. Each message on an encrypted flow adds a small crypto header that includes a random 128-bit Initialization Vector (IV). If the server does not have OpenSSL enabled, the flow allocation will fail with an -ECRYPT error. Future optimizations are to piggyback the public keys on the flow allocation message, and to enable per-flow encryption that maintains the context of the encryption over multiple packets and doesn't require sending IVs. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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