Imports cloud.google.com/go/kms/apiv1 github.com/golang-jwt/jwt github.com/patrickmn/go-cache github.com/pquerna/cachecontrol google.golang.org/api/iamcredentials/v1 google.golang.org/appengine google.golang.org/genproto/googleapis/cloud/kms/v1 Standard library imports context crypto crypto/rsa crypto/sha1 crypto/x509 encoding/asn1 encoding/base64 encoding/json encoding/pem errors fmt io/ioutil math/big net/http strings sync time