Add interactor CreateRSAKeys

app/interactors/create_rsa_keys.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class CreateRSAKeys
+  include Interactor
+
+  BITS = 4096
+
+  def call
+    pkey = OpenSSL::PKey::RSA.new BITS
+
+    context.private_key_pem = pkey.to_pem.freeze
+    context.public_key_pem  = pkey.public_key.to_pem.freeze
+
+    context.public_key = RSAPublicKey.create!(
+      bits: BITS,
+      pem: context.public_key_pem,
+    )
+  end
+end

spec/interactors/create_rsa_keys_spec.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe CreateRSAKeys do
+  subject { described_class.call }
+
+  specify do
+    expect { subject }.to change(RSAPublicKey, :count).by(1)
+  end
+
+  specify do
+    expect(subject.private_key_pem).to be_instance_of String
+  end
+
+  specify do
+    expect(subject.public_key_pem).to be_instance_of String
+  end
+
+  specify do
+    expect(subject.public_key).to be_instance_of RSAPublicKey
+  end
+
+  specify do
+    expect(subject.private_key_pem).to be_frozen
+  end
+
+  specify do
+    expect(subject.public_key_pem).to be_frozen
+  end
+
+  specify do
+    expect { OpenSSL::PKey::RSA.new subject.private_key_pem }.not_to raise_error
+  end
+
+  specify do
+    expect { OpenSSL::PKey::RSA.new subject.public_key_pem }.not_to raise_error
+  end
+
+  specify do
+    expect(subject.public_key_pem).to \
+      eq OpenSSL::PKey::RSA.new(subject.private_key_pem).public_key.to_pem
+  end
+
+  specify do
+    expect(subject.public_key.pem).to eq subject.public_key_pem
+  end
+end