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diff --git a/libjava/classpath/gnu/java/security/jce/sig/RSAKeyFactory.java b/libjava/classpath/gnu/java/security/jce/sig/RSAKeyFactory.java
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+++ b/libjava/classpath/gnu/java/security/jce/sig/RSAKeyFactory.java
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+/* RSAKeyFactory.java -- RSA key-factory JCE Adapter
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.security.jce.sig;
+
+import gnu.java.security.Registry;
+import gnu.java.security.key.rsa.GnuRSAPrivateKey;
+import gnu.java.security.key.rsa.GnuRSAPublicKey;
+import gnu.java.security.key.rsa.RSAKeyPairPKCS8Codec;
+import gnu.java.security.key.rsa.RSAKeyPairX509Codec;
+
+import java.math.BigInteger;
+import java.security.InvalidKeyException;
+import java.security.Key;
+import java.security.KeyFactorySpi;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.interfaces.RSAPrivateCrtKey;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.KeySpec;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.RSAPrivateCrtKeySpec;
+import java.security.spec.RSAPrivateKeySpec;
+import java.security.spec.RSAPublicKeySpec;
+import java.security.spec.X509EncodedKeySpec;
+
+public class RSAKeyFactory
+    extends KeyFactorySpi
+{
+  // implicit 0-arguments constructor
+
+  protected PublicKey engineGeneratePublic(KeySpec keySpec)
+      throws InvalidKeySpecException
+  {
+    if (keySpec instanceof RSAPublicKeySpec)
+      {
+        RSAPublicKeySpec spec = (RSAPublicKeySpec) keySpec;
+        BigInteger n = spec.getModulus();
+        BigInteger e = spec.getPublicExponent();
+        return new GnuRSAPublicKey(Registry.X509_ENCODING_ID, n, e);
+      }
+    if (keySpec instanceof X509EncodedKeySpec)
+      {
+        X509EncodedKeySpec spec = (X509EncodedKeySpec) keySpec;
+        byte[] encoded = spec.getEncoded();
+        PublicKey result;
+        try
+          {
+            return new RSAKeyPairX509Codec().decodePublicKey(encoded);
+          }
+        catch (RuntimeException x)
+          {
+            throw new InvalidKeySpecException(x.getMessage(), x);
+          }
+      }
+    throw new InvalidKeySpecException("Unsupported (public) key specification");
+  }
+
+  protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
+      throws InvalidKeySpecException
+  {
+    if (keySpec instanceof RSAPrivateCrtKeySpec)
+      {
+        RSAPrivateCrtKeySpec spec = (RSAPrivateCrtKeySpec) keySpec;
+        BigInteger n = spec.getModulus();
+        BigInteger e = spec.getPublicExponent();
+        BigInteger d = spec.getPrivateExponent();
+        BigInteger p = spec.getPrimeP();
+        BigInteger q = spec.getPrimeQ();
+        BigInteger dP = spec.getPrimeExponentP();
+        BigInteger dQ = spec.getPrimeExponentQ();
+        BigInteger qInv = spec.getCrtCoefficient();
+        return new GnuRSAPrivateKey(Registry.PKCS8_ENCODING_ID,
+                                    n, e, d, p, q, dP, dQ, qInv);
+      }
+    if (keySpec instanceof PKCS8EncodedKeySpec)
+      {
+        PKCS8EncodedKeySpec spec = (PKCS8EncodedKeySpec) keySpec;
+        byte[] encoded = spec.getEncoded();
+        PrivateKey result;
+        try
+          {
+            return new RSAKeyPairPKCS8Codec().decodePrivateKey(encoded);
+          }
+        catch (RuntimeException x)
+          {
+            throw new InvalidKeySpecException(x.getMessage(), x);
+          }
+      }
+    throw new InvalidKeySpecException("Unsupported (private) key specification");
+  }
+
+  protected KeySpec engineGetKeySpec(Key key, Class keySpec)
+      throws InvalidKeySpecException
+  {
+    if (key instanceof RSAPublicKey)
+      {
+        if (keySpec.isAssignableFrom(RSAPublicKeySpec.class))
+        {
+          RSAPublicKey rsaKey = (RSAPublicKey) key;
+          BigInteger n = rsaKey.getModulus();
+          BigInteger e = rsaKey.getPublicExponent();
+          return new RSAPublicKeySpec(n, e);
+        }
+        if (keySpec.isAssignableFrom(X509EncodedKeySpec.class))
+          {
+            if (key instanceof GnuRSAPublicKey)
+              {
+                GnuRSAPublicKey rsaKey = (GnuRSAPublicKey) key;
+                byte[] encoded = rsaKey.getEncoded(Registry.X509_ENCODING_ID);
+                return new X509EncodedKeySpec(encoded);
+              }
+
+            if (Registry.X509_ENCODING_SORT_NAME.equalsIgnoreCase(key.getFormat()))
+              {
+                byte[] encoded = key.getEncoded();
+                return new X509EncodedKeySpec(encoded);
+              }
+            throw new InvalidKeySpecException(
+                "Wrong key type or unsupported (public) key specification");
+          }
+        throw new InvalidKeySpecException("Unsupported (public) key specification");
+      }
+    if ((key instanceof RSAPrivateCrtKey)
+        && keySpec.isAssignableFrom(RSAPrivateCrtKeySpec.class))
+      {
+        RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey) key;
+        BigInteger n = rsaKey.getModulus();
+        BigInteger e = rsaKey.getPublicExponent();
+        BigInteger d = rsaKey.getPrivateExponent();
+        BigInteger p = rsaKey.getPrimeP();
+        BigInteger q = rsaKey.getPrimeQ();
+        BigInteger dP = rsaKey.getPrimeExponentP();
+        BigInteger dQ = rsaKey.getPrimeExponentQ();
+        BigInteger qInv = rsaKey.getCrtCoefficient();
+        return new RSAPrivateCrtKeySpec(n, e, d, p, q, dP, dQ, qInv);
+      }
+    if ((key instanceof RSAPrivateKey)
+        && keySpec.isAssignableFrom(RSAPrivateKeySpec.class))
+      {
+        RSAPrivateKey rsaKey = (RSAPrivateKey) key;
+        BigInteger n = rsaKey.getModulus();
+        BigInteger d = rsaKey.getPrivateExponent();
+        return new RSAPrivateKeySpec(n, d);
+      }
+    if (keySpec.isAssignableFrom(PKCS8EncodedKeySpec.class))
+      {
+        if (key instanceof GnuRSAPrivateKey)
+          {
+            GnuRSAPrivateKey rsaKey = (GnuRSAPrivateKey) key;
+            byte[] encoded = rsaKey.getEncoded(Registry.PKCS8_ENCODING_ID);
+            return new PKCS8EncodedKeySpec(encoded);
+          }
+        if (Registry.PKCS8_ENCODING_SHORT_NAME.equalsIgnoreCase(key.getFormat()))
+          {
+            byte[] encoded = key.getEncoded();
+            return new PKCS8EncodedKeySpec(encoded);
+          }
+        throw new InvalidKeySpecException(
+            "Wrong key type or unsupported (private) key specification");
+      }
+    throw new InvalidKeySpecException(
+        "Wrong key type or unsupported key specification");
+  }
+
+  protected Key engineTranslateKey(Key key) throws InvalidKeyException
+  {
+    if ((key instanceof GnuRSAPublicKey) || (key instanceof GnuRSAPrivateKey))
+      return key;
+
+    if (key instanceof RSAPublicKey)
+      {
+        RSAPublicKey rsaKey = (RSAPublicKey) key;
+        BigInteger n = rsaKey.getModulus();
+        BigInteger e = rsaKey.getPublicExponent();
+        return new GnuRSAPublicKey(Registry.X509_ENCODING_ID, n, e);
+      }
+    if (key instanceof RSAPrivateCrtKey)
+      {
+        RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey) key;
+        BigInteger n = rsaKey.getModulus();
+        BigInteger e = rsaKey.getPublicExponent();
+        BigInteger d = rsaKey.getPrivateExponent();
+        BigInteger p = rsaKey.getPrimeP();
+        BigInteger q = rsaKey.getPrimeQ();
+        BigInteger dP = rsaKey.getPrimeExponentP();
+        BigInteger dQ = rsaKey.getPrimeExponentQ();
+        BigInteger qInv = rsaKey.getCrtCoefficient();
+        return new GnuRSAPrivateKey(Registry.PKCS8_ENCODING_ID,
+                                    n, e, d, p, q, dP, dQ, qInv);
+      }
+    throw new InvalidKeyException("Unsupported key type");
+  }
+}