From 42c1765941f33f28f41f13f4c9697baf391cab36 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Sat, 24 Jun 2023 10:13:00 +0200
Subject: [PATCH] Add methods to access delegations and 3rd-party
 certifications from keys

---
 .../pgpainless/signature/SignatureUtils.java  | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/pgpainless-core/src/main/java/org/pgpainless/signature/SignatureUtils.java b/pgpainless-core/src/main/java/org/pgpainless/signature/SignatureUtils.java
index 4aac89df..5f713238 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/signature/SignatureUtils.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/signature/SignatureUtils.java
@@ -23,6 +23,7 @@ import org.bouncycastle.openpgp.PGPCompressedData;
 import org.bouncycastle.openpgp.PGPException;
 import org.bouncycastle.openpgp.PGPObjectFactory;
 import org.bouncycastle.openpgp.PGPPublicKey;
+import org.bouncycastle.openpgp.PGPPublicKeyRing;
 import org.bouncycastle.openpgp.PGPSignature;
 import org.bouncycastle.openpgp.PGPSignatureList;
 import org.bouncycastle.util.encoders.Hex;
@@ -307,4 +308,53 @@ public final class SignatureUtils {
 
         return Collections.unmodifiableList(signaturesByKeyId);
     }
+
+    public static @Nonnull List<PGPSignature> getDelegations(PGPPublicKeyRing key) {
+        List<PGPSignature> delegations = new ArrayList<>();
+        PGPPublicKey primaryKey = key.getPublicKey();
+        Iterator<PGPSignature> signatures = primaryKey.getKeySignatures();
+        outerloop: while (signatures.hasNext()) {
+            PGPSignature signature = signatures.next();
+            Iterator<PGPPublicKey> subkeys = key.getPublicKeys();
+            while (subkeys.hasNext()) {
+                if (signature.getKeyID() == subkeys.next().getKeyID()) {
+                    continue outerloop;
+                }
+            }
+            delegations.add(signature);
+        }
+
+        return delegations;
+    }
+
+    public static @Nonnull List<PGPSignature> get3rdPartyCertificationsFor(String userId, PGPPublicKeyRing key) {
+        PGPPublicKey primaryKey = key.getPublicKey();
+        List<PGPSignature> certifications = new ArrayList<>();
+        Iterator<PGPSignature> it = primaryKey.getSignaturesForID(userId);
+        while (it.hasNext()) {
+            PGPSignature sig = it.next();
+            if (sig.getKeyID() != primaryKey.getKeyID()) {
+                certifications.add(sig);
+            }
+        }
+        return certifications;
+    }
+
+    public static class Certification {
+        private final String userId;
+        private final PGPSignature signature;
+
+        public Certification(String userId, PGPSignature signature) {
+            this.userId = userId;
+            this.signature = signature;
+        }
+
+        public String getUserId() {
+            return userId;
+        }
+
+        public PGPSignature getSignature() {
+            return signature;
+        }
+    }
 }