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keyfactory does not accept RSAPrivateKey for private key encryption

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Hi everybody:

I have the following code:

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 KeyFactory keyFactory = KeyFactory.getInstance("RSA");

 X509EncodedKeySpec publicKeySpec = new
X509EncodedKeySpec(encodedPublicKey);
 System.out.println("\tKey Factory Algorithm =
"+keyFactory.getAlgorithm());
 System.out.println("\tKey Factory Provider =
"+keyFactory.getProvider());

 PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);
 System.out.println("\t*** Public key in key factory\n\n");

 PKCS8EncodedKeySpec privateKeySpec = new
PKCS8EncodedKeySpec(encodedPrivateKey);
 System.out.println("\tEncoded KeySpec Format=
"+privateKeySpec.getFormat());
 //-- *** error !
 RSAPrivateKey mc_privkey =
keyFactory.generatePrivate(privateKeySpec);
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And when this code is run, I get the following error:

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         java.security.InvalidKeyException: IOException : DER input,
Integer tag error
java.security.spec.InvalidKeySpecException:
java.security.InvalidKeyException: I
OException : DER input, Integer tag error
        at
sun.security.rsa.RSAKeyFactory.engineGeneratePrivate(Unknown Source)
        at java.security.KeyFactory.generatePrivate(Unknown Source)
        at encripta.main(encripta.java:99)

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It seems the keyfactory does not accept the RSAPrivateKey object, Why?
What is missing or wrong?

Thank you in advance

Marco.
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keyfactory does not accept RSAPrivateKey for private key encryption "Marco A. Cruz Quevedo" <macruzq@myway.com> - 2011-01-29 07:10 -0800

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