Certificate Part 1: Integrate CA Server Client

[lydiazcheng]

Changes

• Add CA client interfaces
  • IV2GCertificateAuthorityClient
  • IChargingStationCertificateAuthorityClient
• Add 2 Implementations of ca clients: Hubject, ACME (Let's encrypt)
  • Hubject: process V2G cert in A02
  • ACME: process Charging Station cert in A02. Also allow sign cert using Let's encrypt root ca cert. This function is used in PR: https://github.com/citrineos/citrineos-core/pull/77
• Add new fields for ca clients in system config.
• Add a CertificateAuthorityService which instantiates CA clients.
• refactor _handleSignCertificate.
  • verify request and then accept or reject the request. (Currently this logic is commented out partially due to a OCTT failed test case)
  • sign csr and return a certificate chain (from leaf to sub ca cert except for root ca cert) to charger

Local Tests

Test case 1 sign v2g certificate by hubject and return a cert chain contain signed cert followed by 2 sub CAs. Test case 2 sign charging station certificate by our sub CA and return a cert chain contain signed cert followed by the sub CA. (Change some code temperaly to only test the flow in A02 without testing a fully workable Profile 3 connection) Test case 3 verify organization name in the csr