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lightningd/hsm_control.c: Implement getsharedsecret.

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ChangeLog-Added: New `getsharedsecret` command, which lets you compute a shared secret with this node knowing only a public point. This implements the BOLT standard of hashing the ECDH point, and is incompatible with ECIES.
This commit is contained in:
ZmnSCPxj jxPCSnmZ
2020-02-04 13:53:17 +08:00
committed by Rusty Russell
parent 1b0807444b
commit d9b2482415
10 changed files with 284 additions and 2 deletions
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26
tests/test_misc.py
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@@ -2151,3 +2151,29 @@ def test_sendcustommsg(node_factory):
l4.daemon.wait_for_log(
r'Got a custom message {serialized} from peer {peer_id}'.format(
serialized=serialized, peer_id=l2.info['id']))
@unittest.skipIf(not DEVELOPER, "needs --dev-force-privkey")
def test_getsharedsecret(node_factory):
"""
Test getsharedsecret command.
"""
# From BOLT 8 test vectors.
options = [
{"dev-force-privkey": "1212121212121212121212121212121212121212121212121212121212121212"},
{}
]
l1, l2 = node_factory.get_nodes(2, opts=options)
# Check BOLT 8 test vectors.
shared_secret = l1.rpc.getsharedsecret("028d7500dd4c12685d1f568b4c2b5048e8534b873319f3a8daa612b469132ec7f7")['shared_secret']
assert (shared_secret == "1e2fb3c8fe8fb9f262f649f64d26ecf0f2c0a805a767cf02dc2d77a6ef1fdcc3")
# Clear the forced privkey of l1.
del l1.daemon.opts["dev-force-privkey"]
l1.restart()
# l1 and l2 can generate the same shared secret
# knowing only the public key of the other.
assert (l1.rpc.getsharedsecret(l2.info["id"])["shared_secret"]
== l2.rpc.getsharedsecret(l1.info["id"])["shared_secret"])