Add poor man’s ASN1 parsing

spec/lib/asn1/timestamp_spec.rb

@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe ASN1::Timestamp do
+  let(:asn1timestamp) { File.read('spec/fixtures/files/bill_signature/signature.der') }
+
+  describe '.timestamp_time' do
+    subject { described_class.signature_time(asn1timestamp) }
+
+    it { is_expected.to eq Time.zone.parse('2019-04-30 15:30:20 UTC') }
+  end
+
+  describe '.timestamp_signed_data' do
+    subject { described_class.signed_digest(asn1timestamp) }
+
+    let(:data) { Digest::SHA256.hexdigest('CECI EST UN BLOB') }
+
+    it { is_expected.to eq data }
+  end
+end