From 9e8d603d14561095fb8d08871319a315d3bf6763 Mon Sep 17 00:00:00 2001 From: Dimitri Staessens Date: Fri, 2 Aug 2019 19:12:34 +0200 Subject: 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 Signed-off-by: Sander Vrijders --- doc/man/flow_alloc.3 | 3 +++ 1 file changed, 3 insertions(+) (limited to 'doc') diff --git a/doc/man/flow_alloc.3 b/doc/man/flow_alloc.3 index f4a6cf8d..48923fde 100644 --- a/doc/man/flow_alloc.3 +++ b/doc/man/flow_alloc.3 @@ -94,6 +94,9 @@ Not enough system memory resources available to allocate the flow. .B -ETIMEDOUT Flow allocation timed out. +.B -ECRYPT +The requested encryption is not supported. + .SH ATTRIBUTES For an explanation of the terms used in this section, see \fBattributes\fR(7). -- cgit v1.2.3