Add support for RegularExpression subpackets (fixes #246)

pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/BaseSignatureSubpackets.java

@@ -17,6 +17,7 @@ import org.bouncycastle.bcpg.sig.IssuerFingerprint;
 import org.bouncycastle.bcpg.sig.IssuerKeyID;
 import org.bouncycastle.bcpg.sig.NotationData;
 import org.bouncycastle.bcpg.sig.PolicyURI;
+import org.bouncycastle.bcpg.sig.RegularExpression;
 import org.bouncycastle.bcpg.sig.Revocable;
 import org.bouncycastle.bcpg.sig.SignatureCreationTime;
 import org.bouncycastle.bcpg.sig.SignatureExpirationTime;
@@ -96,6 +97,12 @@ public interface BaseSignatureSubpackets {
 
     BaseSignatureSubpackets setPolicyUrl(@Nullable PolicyURI policyUrl);
 
+    BaseSignatureSubpackets setRegularExpression(@Nonnull String regex);
+
+    BaseSignatureSubpackets setRegularExpression(boolean isCritical, @Nonnull String regex);
+
+    BaseSignatureSubpackets setRegularExpression(@Nullable RegularExpression regex);
+
     BaseSignatureSubpackets setRevocable(boolean revocable);
 
     BaseSignatureSubpackets setRevocable(boolean isCritical, boolean isRevocable);

pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/SignatureSubpackets.java

@@ -30,6 +30,7 @@ import org.bouncycastle.bcpg.sig.NotationData;
 import org.bouncycastle.bcpg.sig.PolicyURI;
 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;
@@ -72,6 +73,7 @@ public class SignatureSubpackets
     private KeyExpirationTime keyExpirationTime;
     private PolicyURI policyURI;
     private PrimaryUserID primaryUserId;
+    private RegularExpression regularExpression;
     private Revocable revocable;
     private RevocationReason revocationReason;
     private final List<SignatureSubpacket> residualSubpackets = new ArrayList<>();
@@ -508,6 +510,26 @@ public class SignatureSubpackets
         return policyURI;
     }
 
+    @Override
+    public BaseSignatureSubpackets setRegularExpression(@Nonnull String regex) {
+        return setRegularExpression(false, regex);
+    }
+
+    @Override
+    public BaseSignatureSubpackets setRegularExpression(boolean isCritical, @Nonnull String regex) {
+        return setRegularExpression(new RegularExpression(isCritical, regex));
+    }
+
+    @Override
+    public BaseSignatureSubpackets setRegularExpression(@Nullable RegularExpression regex) {
+        this.regularExpression = regex;
+        return this;
+    }
+
+    public RegularExpression getRegularExpression() {
+        return regularExpression;
+    }
+
     @Override
     public SignatureSubpackets setRevocable(boolean revocable) {
         return setRevocable(true, revocable);

pgpainless-core/src/main/java/org/pgpainless/signature/subpackets/SignatureSubpacketsHelper.java

@@ -15,6 +15,7 @@ import org.bouncycastle.bcpg.sig.NotationData;
 import org.bouncycastle.bcpg.sig.PolicyURI;
 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;
@@ -119,8 +120,11 @@ public class SignatureSubpacketsHelper {
                     PolicyURI policyURI = (PolicyURI) subpacket;
                     subpackets.setPolicyUrl(policyURI);
                     break;
-
                 case regularExpression:
+                    RegularExpression regex = (RegularExpression) subpacket;
+                    subpackets.setRegularExpression(regex);
+                    break;
+                    
                 case keyServerPreferences:
                 case preferredKeyServers:
                 case placeholder:
@@ -140,6 +144,7 @@ public class SignatureSubpacketsHelper {
         addSubpacket(generator, subpackets.getSignatureExpirationTimeSubpacket());
         addSubpacket(generator, subpackets.getExportableSubpacket());
         addSubpacket(generator, subpackets.getPolicyURI());
+        addSubpacket(generator, subpackets.getRegularExpression());
         for (NotationData notationData : subpackets.getNotationDataSubpackets()) {
             addSubpacket(generator, notationData);
         }