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From sermagico <sermag...@tiscali.it>
Subject Re: problem in unwrapping key
Date Wed, 04 Jun 2008 19:14:37 GMT

Hi Brent,
thank you for your reply, I made a mistake in explanation, in fact I already
use the public key for wrapping and the private key for unwrapping (in the
code private key is pkey).
Sorry for the misunderstanding. I hope you can give me a hand.
Thank you in advance.
Sergio.


Brent Putman wrote:
> 
> You have it backwards.  You should encrypt/wrap the AES data encryption 
> key with the recipient's *public* key.  The recipient then decrypts with 
> their *private* key.
> 
> If you think about the use cases, you'll quickly realize why that is.
> 
> --Brent
> 
> 
> sermagico wrote:
>> Hi all,
>> I try to develop an application for xml encryption/decryption, but I have
>> some issue. I encrypt a file with a AES key, then I wrap this key with a
>> RSAprivateKey and I store it (wrapped AES) in the same xml file. 
>> Unfortunately when I try to unwrap the AES key with the PublicKey
>> associated
>> with the previous PrivateKey the below exception is raised up:
>>
>> Exception in thread "main"
>> org.apache.xml.security.encryption.XMLEncryptionException: unknown key
>> type
>> passed to RSA
>> Original Exception was java.security.InvalidKeyException: unknown key
>> type
>> passed to RSA
>>
>>
>> PublicKey and PrivateKey are stored on a smartcard.
>> This is my code:
>>
>>         XMLCipher CKey= XMLCipher.getInstance();
>>         XMLCipher CMsg= XMLCipher.getInstance();
>>         CKey.init(XMLCipher.UNWRAP_MODE, this.pkey);
>>         CMsg.init(XMLCipher.DECRYPT_MODE, null);
>>         
>>        
>>         Element encryptedDataElement = (Element) document
>>                
>> .getElementsByTagNameNS(EncryptionConstants.EncryptionSpecNS,
>>                 EncryptionConstants._TAG_ENCRYPTEDDATA).item(0);
>>               
>>         EncryptedData encryptedData =
>> xmlCipherMsg.loadEncryptedData(document,
>>                 encryptedDataElement);
>>         EncryptedKey encryptedKey = encryptedData.getKeyInfo()
>>         .itemEncryptedKey(0);
>>         
>>         String algorithm =
>> encryptedKey.getEncryptionMethod().getAlgorithm();
>>         
>>         CipherValue Value =
>> encryptedKey.getCipherData().getCipherValue();
>>                
>> //Exception here
>>         Key secretKey = xmlCipherKey.decryptKey(encryptedKey,algorithm );
>>         
>>
>> I hope you can help me.
>> Thank you in advance.
>> Best regards.
>>
>> Sergio.
>>        
>>   
> 
> 

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