From 90626a8a764349e3cc0f1c4c79a6d864c4e4dff1 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Mon, 19 Jun 2023 10:56:42 +0200
Subject: [PATCH] Add SignatureSubpacketsUtil.getRegularExpressions()

---
 .../subpackets/SignatureSubpacketsUtil.java    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/SignatureSubpacketsUtil.java b/pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/SignatureSubpacketsUtil.java
index 1105a813..e69ea0a7 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/SignatureSubpacketsUtil.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/SignatureSubpacketsUtil.java
@@ -23,6 +23,7 @@ import org.bouncycastle.bcpg.sig.KeyFlags;
 import org.bouncycastle.bcpg.sig.NotationData;
 import org.bouncycastle.bcpg.sig.PreferredAlgorithms;
 import org.bouncycastle.bcpg.sig.PrimaryUserID;
+import org.bouncycastle.bcpg.sig.RegularExpression;
 import org.bouncycastle.bcpg.sig.Revocable;
 import org.bouncycastle.bcpg.sig.RevocationKey;
 import org.bouncycastle.bcpg.sig.RevocationReason;
@@ -540,6 +541,23 @@ public final class SignatureSubpacketsUtil {
         return hashed(signature, SignatureSubpacket.trustSignature);
     }
 
+    /**
+     * Return all regular expression subpackets from the hashed area of the given signature.
+     *
+     * @param signature signature
+     * @return list of regular expressions
+     */
+    public static List<RegularExpression> getRegularExpressions(PGPSignature signature) {
+        org.bouncycastle.bcpg.SignatureSubpacket[] subpackets = signature.getHashedSubPackets()
+                .getSubpackets(SignatureSubpacket.regularExpression.getCode());
+        List<RegularExpression> regularExpressions = new ArrayList<>(subpackets.length);
+        for (org.bouncycastle.bcpg.SignatureSubpacket subpacket : subpackets) {
+            regularExpressions.add((RegularExpression) subpacket);
+        }
+        return regularExpressions;
+    }
+
+
     /**
      * Select a list of all signature subpackets of the given type, which are present in the hashed area of
      * the given signature.