move key generation functions into Pleroma.Keys module

test/keys_test.exs

@@ -0,0 +1,20 @@
+defmodule Pleroma.KeysTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Keys
+
+  test "generates an RSA private key pem" do
+    {:ok, key} = Keys.generate_rsa_pem()
+
+    assert is_binary(key)
+    assert Regex.match?(~r/RSA/, key)
+  end
+
+  test "returns a public and private key from a pem" do
+    pem = File.read!("test/fixtures/private_key.pem")
+    {:ok, private, public} = Keys.keys_from_pem(pem)
+
+    assert elem(private, 0) == :RSAPrivateKey
+    assert elem(public, 0) == :RSAPublicKey
+  end
+end