1 files changed, 31 insertions, 5 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSAUtil.java b/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSAUtil.java
index c7e2aa91..10bac464 100644
--- a/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSAUtil.java
+++ b/bcprov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSAUtil.java
@@ -3,11 +3,14 @@ package org.bouncycastle.jcajce.provider.asymmetric.dsa;
 import java.security.InvalidKeyException;
 import java.security.PrivateKey;
 import java.security.PublicKey;
+import java.security.interfaces.DSAParams;
 import java.security.interfaces.DSAPrivateKey;
 import java.security.interfaces.DSAPublicKey;
+import java.security.spec.DSAParameterSpec;
 
 import org.bouncycastle.asn1.ASN1ObjectIdentifier;
 import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
+import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
 import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
 import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
 import org.bouncycastle.crypto.params.DSAParameters;
@@ -43,19 +46,42 @@ public class DSAUtil
         return false;
     }
 
+    static DSAParameters toDSAParameters(DSAParams spec)
+    {
+        if (spec != null)
+        {
+             return new DSAParameters(spec.getP(), spec.getQ(), spec.getG());
+        }
+
+        return null;
+    }
+
     static public AsymmetricKeyParameter generatePublicKeyParameter(
         PublicKey    key)
         throws InvalidKeyException
     {
-        if (key instanceof DSAPublicKey)
+        if (key instanceof BCDSAPublicKey)
         {
-            DSAPublicKey    k = (DSAPublicKey)key;
+            return ((BCDSAPublicKey)key).engineGetKeyParameters();
+        }
 
-            return new DSAPublicKeyParameters(k.getY(),
-                new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
+        if (key instanceof DSAPublicKey)
+        {
+            return new BCDSAPublicKey((DSAPublicKey)key).engineGetKeyParameters();
         }
 
-        throw new InvalidKeyException("can't identify DSA public key: " + key.getClass().getName());
+        try
+        {
+            byte[]  bytes = key.getEncoded();
+
+            BCDSAPublicKey bckey = new BCDSAPublicKey(SubjectPublicKeyInfo.getInstance(bytes));
+
+            return bckey.engineGetKeyParameters();
+        }
+        catch (Exception e)
+        {
+            throw new InvalidKeyException("can't identify DSA public key: " + key.getClass().getName());
+        }
     }
 
     static public AsymmetricKeyParameter generatePrivateKeyParameter(