Implement NIP-04: Encrypted Direct Messages

sig/nostr/crypto.rbs

@@ -1,9 +1,16 @@
 module Nostr
   class Crypto
+    BN_BASE: Integer
+    CIPHER_CURVE: String
+    CIPHER_ALGORITHM: String
+
+    def encrypt_text: (String, String, String) -> String
+    def decrypt_text: (String, String, String) -> String
     def sign_event: (Event, String) -> Event
 
     private
 
+    def compute_shared_key: (String, String) -> String
     def hash_event:(Event) -> String
   end
 end

sig/nostr/event_kind.rbs

@@ -4,5 +4,6 @@ module Nostr
     TEXT_NOTE: Integer
     RECOMMEND_SERVER: Integer
     CONTACT_LIST: Integer
+    ENCRYPTED_DIRECT_MESSAGE: Integer
   end
 end

sig/nostr/events/encrypted_direct_message.rbs

@@ -0,0 +1,12 @@
+module Nostr
+  module Events
+    class EncryptedDirectMessage < Event
+      def initialize: (
+          plain_text: String,
+          sender_private_key: String,
+          recipient_public_key: String,
+          ?previous_direct_message: String|nil
+        ) -> void
+    end
+  end
+end