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| author | Dimitri Staessens <dimitri@ouroboros.rocks> | 2019-08-02 19:12:34 +0200 |
|---|---|---|
| committer | Sander Vrijders <sander@ouroboros.rocks> | 2019-08-03 12:10:57 +0200 |
| commit | 9e8d603d14561095fb8d08871319a315d3bf6763 (patch) | |
| tree | 7a87c212fcd642a8696145b4246a4fc4cf964e10 /src/ipcpd/unicast/fa.c | |
| parent | 8a37ffbf8c0776a38f2de18a63e885383960ee68 (diff) | |
| download | ouroboros-9e8d603d14561095fb8d08871319a315d3bf6763.tar.gz ouroboros-9e8d603d14561095fb8d08871319a315d3bf6763.zip | |
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>
Diffstat (limited to 'src/ipcpd/unicast/fa.c')
| -rw-r--r-- | src/ipcpd/unicast/fa.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/ipcpd/unicast/fa.c b/src/ipcpd/unicast/fa.c index fbcbc6fa..c1cb065f 100644 --- a/src/ipcpd/unicast/fa.c +++ b/src/ipcpd/unicast/fa.c @@ -66,6 +66,7 @@ struct fa_msg { uint32_t loss; uint32_t ber; uint32_t max_gap; + uint16_t cypher_s; } __attribute__((packed)); struct cmd { @@ -217,6 +218,7 @@ static void * fa_handle_packet(void * o) qs.ber = ntoh32(msg->ber); qs.in_order = msg->in_order; qs.max_gap = ntoh32(msg->max_gap); + qs.cypher_s = ntoh16(msg->cypher_s); fd = ipcp_flow_req_arr((uint8_t *) (msg + 1), ipcp_dir_hash_len(), @@ -386,6 +388,7 @@ int fa_alloc(int fd, msg->ber = hton32(qs.ber); msg->in_order = qs.in_order; msg->max_gap = hton32(qs.max_gap); + msg->cypher_s = hton16(qs.cypher_s); memcpy(msg + 1, dst, ipcp_dir_hash_len()); |