Add basic canonicalization test for new BC generator class

pgpainless-core/src/test/java/org/bouncycastle/LiteralDataCRLFEncodingTest.java

@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.bouncycastle;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+import org.bouncycastle.openpgp.PGPCanonicalizedDataGenerator;
+import org.bouncycastle.util.io.Streams;
+import org.junit.jupiter.api.Test;
+
+public class LiteralDataCRLFEncodingTest {
+
+    @Test
+    public void testCanonicalization() throws IOException {
+        PGPCanonicalizedDataGenerator generator = new PGPCanonicalizedDataGenerator();
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        OutputStream canonicalizer = generator.open(out, PGPCanonicalizedDataGenerator.UTF8, "", new Date(), new byte[1<<9]);
+
+        ByteArrayInputStream in = new ByteArrayInputStream("Foo\nBar\n".getBytes(StandardCharsets.UTF_8));
+        Streams.pipeAll(in, canonicalizer);
+        canonicalizer.close();
+
+        byte[] bytes = out.toByteArray();
+        byte[] canonicalized = new byte[bytes.length - 8]; // header is not interesting
+        System.arraycopy(bytes, 8, canonicalized, 0, canonicalized.length);
+        assertArrayEquals(new byte[] {
+                // F o o \r \n B a r \r \n
+                70, 111, 111, 13, 10, 66, 97, 114, 13, 10},
+                canonicalized);
+    }
+}