Wip: Add more elliptic curves, support for {X,Ed}25519

pgpainless-core/src/main/java/org/pgpainless/algorithm/PublicKeyAlgorithm.java

@@ -36,6 +36,7 @@ public enum PublicKeyAlgorithm {
     ECDSA           (PublicKeyAlgorithmTags.ECDSA),
     ELGAMAL_GENERAL (PublicKeyAlgorithmTags.ELGAMAL_GENERAL),
     DIFFIE_HELLMAN  (PublicKeyAlgorithmTags.DIFFIE_HELLMAN),
+    EDDSA           (PublicKeyAlgorithmTags.EDDSA),
     ;
 
     private static final Map<Integer, PublicKeyAlgorithm> MAP = new ConcurrentHashMap<>();

pgpainless-core/src/main/java/org/pgpainless/key/generation/type/EDDSA.java

@@ -0,0 +1,35 @@
+package org.pgpainless.key.generation.type;
+
+import java.security.spec.AlgorithmParameterSpec;
+
+import org.bouncycastle.jce.spec.ECNamedCurveGenParameterSpec;
+import org.pgpainless.algorithm.PublicKeyAlgorithm;
+import org.pgpainless.key.generation.type.curve.EdDSACurve;
+
+public class EDDSA implements KeyType {
+
+    private final EdDSACurve curve;
+
+    private EDDSA(EdDSACurve curve) {
+        this.curve = curve;
+    }
+
+    public static EDDSA fromCurve(EdDSACurve curve) {
+        return new EDDSA(curve);
+    }
+
+    @Override
+    public String getName() {
+        return "EdDSA";
+    }
+
+    @Override
+    public PublicKeyAlgorithm getAlgorithm() {
+        return PublicKeyAlgorithm.EDDSA;
+    }
+
+    @Override
+    public AlgorithmParameterSpec getAlgorithmSpec() {
+        return new ECNamedCurveGenParameterSpec(curve.getName());
+    }
+}

pgpainless-core/src/main/java/org/pgpainless/key/generation/type/XDH.java

@@ -0,0 +1,35 @@
+package org.pgpainless.key.generation.type;
+
+import java.security.spec.AlgorithmParameterSpec;
+
+import org.bouncycastle.jce.spec.ECNamedCurveGenParameterSpec;
+import org.pgpainless.algorithm.PublicKeyAlgorithm;
+import org.pgpainless.key.generation.type.curve.XDHCurve;
+
+public class XDH implements KeyType {
+
+    private XDHCurve curve;
+
+    private XDH(XDHCurve curve) {
+        this.curve = curve;
+    }
+
+    public static XDH fromCurve(XDHCurve curve) {
+        return new XDH(curve);
+    }
+
+    @Override
+    public String getName() {
+        return "XDH";
+    }
+
+    @Override
+    public PublicKeyAlgorithm getAlgorithm() {
+        return PublicKeyAlgorithm.ECDH;
+    }
+
+    @Override
+    public AlgorithmParameterSpec getAlgorithmSpec() {
+        return new ECNamedCurveGenParameterSpec(curve.getName());
+    }
+}

pgpainless-core/src/main/java/org/pgpainless/key/generation/type/curve/EdDSACurve.java

@@ -0,0 +1,18 @@
+package org.pgpainless.key.generation.type.curve;
+
+import javax.annotation.Nonnull;
+
+public enum EdDSACurve {
+    _Ed25519("ed25519"),
+    ;
+
+    final String name;
+
+    EdDSACurve(@Nonnull String curveName) {
+        this.name = curveName;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

pgpainless-core/src/main/java/org/pgpainless/key/generation/type/curve/EllipticCurve.java

@@ -19,6 +19,8 @@ import javax.annotation.Nonnull;
 
 public enum EllipticCurve {
     _P256("P-256"),
+    _P384("P-384"),
+    _P521("P-521"),
     ;
 
     private final String name;

pgpainless-core/src/main/java/org/pgpainless/key/generation/type/curve/XDHCurve.java

@@ -0,0 +1,18 @@
+package org.pgpainless.key.generation.type.curve;
+
+import javax.annotation.Nonnull;
+
+public enum XDHCurve {
+    _X25519("X25519"),
+    ;
+
+    final String name;
+
+    XDHCurve(@Nonnull String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+}