add tamper protection

src/main/kotlin/com/restapi/domain/db.kt

@@ -13,6 +13,7 @@ import io.ebean.config.DatabaseConfig
 import io.ebean.config.TenantMode
 import org.bouncycastle.openssl.jcajce.JcaPEMWriter
 import org.bouncycastle.util.io.pem.PemReader
+import org.jose4j.jwk.JsonWebKey
 import org.jose4j.jwk.PublicJsonWebKey
 import org.jose4j.jwk.RsaJsonWebKey
 import org.jose4j.jwk.RsaJwkGenerator
@@ -108,7 +109,7 @@ object Session {
 
     }
 
-    fun sign(payload: String): String {
+    fun signPayload(payload: String): String {
 
         // Create a new JsonWebSignature
         val jws = JsonWebSignature()
@@ -161,6 +162,7 @@ object Session {
     fun currentUser() = currentUser.get().userName
     fun currentTenant() = currentUser.get().tenant
     fun currentRoles() = currentUser.get().roles
+    fun jwk() = keypair.toParams(JsonWebKey.OutputControlLevel.PUBLIC_ONLY)
 
     fun Database.findByEntityAndId(entity: String, id: String): DataModel {
         return find(DataModel::class.java)