Add initial implementation of an SSH CA using the JWK provisioner.

Fixes smallstep/ca-component#187

api/api.go

@@ -26,6 +26,7 @@ import (
 
 // Authority is the interface implemented by a CA authority.
 type Authority interface {
+	SSHAuthority
 	// NOTE: Authorize will be deprecated in future releases. Please use the
 	// context specific Authoirize[Sign|Revoke|etc.] methods.
 	Authorize(ott string) ([]provisioner.SignOption, error)
@@ -249,6 +250,8 @@ func (h *caHandler) Route(r Router) {
 	r.MethodFunc("GET", "/federation", h.Federation)
 	// For compatibility with old code:
 	r.MethodFunc("POST", "/re-sign", h.Renew)
+	// SSH CA
+	r.MethodFunc("POST", "/sign-ssh", h.SignSSH)
 }
 
 // Health is an HTTP handler that returns the status of the server.