Add RsaKeyProvider

common/pom.xml

@@ -19,6 +19,10 @@
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.inject</groupId>
+      <artifactId>guice</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.jimfs</groupId>
       <artifactId>jimfs</artifactId>

common/src/main/java/dev/openrs2/common/CommonModule.kt

@@ -0,0 +1,14 @@
+package dev.openrs2.common
+
+import com.google.inject.AbstractModule
+import com.google.inject.Scopes
+import dev.openrs2.common.crypto.RsaKeyProvider
+import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters
+
+class CommonModule : AbstractModule() {
+    override fun configure() {
+        bind(RSAPrivateCrtKeyParameters::class.java)
+            .toProvider(RsaKeyProvider::class.java)
+            .`in`(Scopes.SINGLETON)
+    }
+}

common/src/main/java/dev/openrs2/common/crypto/RsaKeyProvider.kt

@@ -0,0 +1,22 @@
+package dev.openrs2.common.crypto
+
+import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters
+import java.nio.file.Files
+import java.nio.file.Paths
+import javax.inject.Provider
+
+class RsaKeyProvider : Provider<RSAPrivateCrtKeyParameters> {
+    override fun get(): RSAPrivateCrtKeyParameters {
+        return if (Files.exists(PATH)) {
+            Rsa.readPrivateKey(PATH)
+        } else {
+            val (_, private) = Rsa.generateKeyPair()
+            Rsa.writePrivateKey(PATH, private)
+            private
+        }
+    }
+
+    companion object {
+        private val PATH = Paths.get("conf/private.key")
+    }
+}

conf/.gitignore

@@ -0,0 +1 @@
+/private.key

pom.xml

@@ -58,6 +58,11 @@
         <artifactId>guava</artifactId>
         <version>28.2-jre</version>
       </dependency>
+      <dependency>
+        <groupId>com.google.inject</groupId>
+        <artifactId>guice</artifactId>
+        <version>4.2.2</version>
+      </dependency>
       <dependency>
         <groupId>com.google.jimfs</groupId>
         <artifactId>jimfs</artifactId>