From c234e38ae22e84da82c09bebe0aea3c3dfda0f4b Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Thu, 1 Jul 2021 17:37:30 +0200
Subject: [PATCH] Add key extraction and ascii armor examples

---
 .../org/pgpainless/example/ModifyKeys.java    | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/pgpainless-core/src/test/java/org/pgpainless/example/ModifyKeys.java b/pgpainless-core/src/test/java/org/pgpainless/example/ModifyKeys.java
index ec087482..5daf5df3 100644
--- a/pgpainless-core/src/test/java/org/pgpainless/example/ModifyKeys.java
+++ b/pgpainless-core/src/test/java/org/pgpainless/example/ModifyKeys.java
@@ -21,6 +21,7 @@ import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.IOException;
 import java.security.InvalidAlgorithmParameterException;
 import java.security.NoSuchAlgorithmException;
 import java.util.Date;
@@ -28,6 +29,7 @@ import java.util.List;
 
 import org.bouncycastle.openpgp.PGPException;
 import org.bouncycastle.openpgp.PGPPublicKey;
+import org.bouncycastle.openpgp.PGPPublicKeyRing;
 import org.bouncycastle.openpgp.PGPSecretKeyRing;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -69,6 +71,35 @@ public class ModifyKeys {
         signingSubkeyId = info.getSigningSubkeys().get(0).getKeyID();
     }
 
+    /**
+     * This example demonstrates how to extract a certificate (public key) from a secret key.
+     */
+    @Test
+    public void extractPublicKey() {
+        // the certificate consists of only the public keys
+        PGPPublicKeyRing certificate = PGPainless.extractCertificate(secretKey);
+
+
+        KeyRingInfo info = PGPainless.inspectKeyRing(certificate);
+        assertFalse(info.isSecretKey());
+    }
+
+    /**
+     * This example demonstrates how to export a secret key or certificate to an ASCII armored string.
+     */
+    @Test
+    public void toAsciiArmoredString() throws IOException {
+        PGPPublicKeyRing certificate = PGPainless.extractCertificate(secretKey);
+
+
+        String asciiArmoredSecretKey = PGPainless.asciiArmor(secretKey);
+        String asciiArmoredCertificate = PGPainless.asciiArmor(certificate);
+
+
+        assertTrue(asciiArmoredSecretKey.startsWith("-----BEGIN PGP PRIVATE KEY BLOCK-----"));
+        assertTrue(asciiArmoredCertificate.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----"));
+    }
+
     /**
      * This example demonstrates how to change the passphrase of a secret key and all its subkeys.
      *