tree c39e76f0be0b038528fa55c6b8c7010445e575e5
parent 4d3f4d9ffa16a13f451c3b2999e9c49e9750bf06
author Alex Vaghin <ddos@google.com> 1540579477 -0700
committer Filippo Valsorda <filippo@golang.org> 1541517824 +0000

acme: support custom crypto.Signer implementations

Currently, only rsa.PrivateKey and ecdsa.PrivateKey are supported
when creating JWS signatures. However, it is unnecessarily limiting
because any crypto.Signer implementation can sign a digest
in the appropriate format.

This change uses key.Public() instead of type-asserting the private
key which allows for a custom crypto.Signer implementation.
For instance, a key stored in a hardware module where the latter
does the actual signing without the key ever leaving its boundaries.

Change-Id: Ie7930ea2ba8c49dde7107ff074ae34abec05bdb9
Reviewed-on: https://go-review.googlesource.com/c/145137
Run-TryBot: Alex Vaghin <ddos@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>