[openssh-commits] [openssh] 01/08: upstream: add a note about the 'extensions' field in the signed

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djm pushed a commit to branch master
in repository openssh.

commit c33d46868c3d88e04a92610cdb429094aeeb5847
Author: djm at openbsd.org <djm at openbsd.org>
Date:   Wed Dec 11 22:19:47 2019 +0000

    upstream: add a note about the 'extensions' field in the signed
    
    object
    
    OpenBSD-Commit-ID: 67c01e0565b258e0818c1ccfe1f1aeaf9a0d4c7b
---
 PROTOCOL.u2f | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/PROTOCOL.u2f b/PROTOCOL.u2f
index 32bfa20f..066d0995 100644
--- a/PROTOCOL.u2f
+++ b/PROTOCOL.u2f
@@ -170,6 +170,10 @@ is signed over a blob that consists of:
 	byte[]		extensions
 	byte[32]	SHA256(message)
 
+No extensons are yet defined for SSH use. If any are defined in the future,
+it will be possible to infer their presence from the contents of the "flags"
+value.
+
 The signature returned from U2F hardware takes the following format:
 
 	byte		flags (including "user present")

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