Ian Haken
dab2b1051b
This commit implements two new features. To preserve backwards compatibility the new methods are added to an `ExtendedAgent` interface which extends `Agent`. The client code implements `ExtendedAgent` (which extends Agent) so you can call these additional methods against SSH agents such as the OpenSSH agent. The ServeAgent method still accepts Agent but will attempt to upcast the agent to `ExtendedAgent` as needed, so if you supply an ExtendedAgent implementation you can implement these additional methods (which keyring does). The first feature is supporting the standard flags that can be passed to SSH Sign requests, requesting that RSA signatures use SHA-256 or SHA-512. See section 4.5.1 of the SSH agent protocol draft: https://tools.ietf.org/html/draft-miller-ssh-agent-02 The second feature is supporting calling custom extensions from clients and implementing custom extensions from servers. See section 4.7 of the SSH agent protocol draft: https://tools.ietf.org/html/draft-miller-ssh-agent-02 Change-Id: I0f74feb893762c27e921ec37604d3a46434ee6ef GitHub-Last-Rev: 2e23fd01c0e95b664e8507682f0bd5bd61d4c146 GitHub-Pull-Request: golang/crypto#53 Reviewed-on: https://go-review.googlesource.com/c/123955 Reviewed-by: Han-Wen Nienhuys <hanwen@google.com> Run-TryBot: Han-Wen Nienhuys <hanwen@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>