diff --git a/core/java/src/net/i2p/crypto/SU3File.java b/core/java/src/net/i2p/crypto/SU3File.java
index b401c8f28..6647c8d45 100644
--- a/core/java/src/net/i2p/crypto/SU3File.java
+++ b/core/java/src/net/i2p/crypto/SU3File.java
@@ -515,6 +515,10 @@ public class SU3File {
         StringBuilder buf = new StringBuilder(256);
         buf.append("Available signature types:\n");
         for (SigType t : EnumSet.allOf(SigType.class)) {
+            if (!t.isAvailable())
+                continue;
+            if (t == SigType.EdDSA_SHA512_25519)
+                continue; // not supported by keytool, and does double hashing right now
             buf.append("      ").append(t).append("\t(code: ").append(t.getCode()).append(')');
             if (t.getCode() == DEFAULT_SIG_CODE)
                 buf.append(" DEFAULT");
diff --git a/core/java/src/net/i2p/crypto/SigUtil.java b/core/java/src/net/i2p/crypto/SigUtil.java
index 3d423c662..cbf330ccb 100644
--- a/core/java/src/net/i2p/crypto/SigUtil.java
+++ b/core/java/src/net/i2p/crypto/SigUtil.java
@@ -248,14 +248,22 @@ public class SigUtil {
 
     private static EdDSAPublicKey cvtToJavaEdDSAKey(SigningPublicKey pk)
                               throws GeneralSecurityException {
-        return new EdDSAPublicKey(new EdDSAPublicKeySpec(
+        try {
+            return new EdDSAPublicKey(new EdDSAPublicKeySpec(
                 pk.getData(), (EdDSAParameterSpec) pk.getType().getParams()));
+        } catch (IllegalArgumentException iae) {
+            throw new InvalidKeyException(iae);
+        }
     }
 
     private static EdDSAPrivateKey cvtToJavaEdDSAKey(SigningPrivateKey pk)
                               throws GeneralSecurityException {
-        return new EdDSAPrivateKey(new EdDSAPrivateKeySpec(
+        try {
+            return new EdDSAPrivateKey(new EdDSAPrivateKeySpec(
                 pk.getData(), (EdDSAParameterSpec) pk.getType().getParams()));
+        } catch (IllegalArgumentException iae) {
+            throw new InvalidKeyException(iae);
+        }
     }
 
     public static SigningPublicKey fromJavaKey(EdDSAPublicKey pk, SigType type)