Hi,
I try to change the algorithm name in "decryptkey" method, but I don't solve
the problem.
If I insert :
Key secretKey = xmlCipherKey.decryptKey(encryptedKey,"AES");
I get the following exception:
Exception in thread "main" java.lang.NullPointerException
at
org.apache.xml.security.algorithms.JCEMapper.getJCEKeyAlgorithmFromURI(Unknown
Source)
at org.apache.xml.security.encryption.XMLCipher.decryptKey(Unknown
Source)
Instead if I insert one of the following I get the exception I've explained
last time:
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,XMLCipher.AES_128);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,XMLCipher.AES_128_KeyWrap);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,XMLCipher.AES_192);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,XMLCipher.AES_192_KeyWrap);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,XMLCipher.AES_256);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,XMLCipher.AES_256_KeyWrap);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,"http://www.w3.org/2001/04/xmlenc#aes128-cbc";);
final Key secretKey =
xmlCipherKey.decryptKey(encryptedKey,"http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p";);
Thank you for your help.
Regards.
Sergio.
Brent Putman wrote:
>
> Ok. I think I see your problem:
>
> String algorithm = encryptedKey.getEncryptionMethod().getAlgorithm();
>
> Key secretKey = xmlCipherKey.decryptKey(encryptedKey,algorithm );
>
> The algorithm URI that you pass into the XMLCipher#decryptKey method is
> the algorithm URI for the wrapped key that you are decrypting, *not* the
> one associated with the key encryption key itself. When it gets
> unwrapped/decrypted, it's just an array of bytes. You have to give it
> structure by telling it how to interpret that byte[] so it can produce a
> specific SecretKey impl (AES, triple DES, etc).
>
> So in your case it would be the AES one for the data encryption key.
> So, you would pull that from the
> EncryptedData/EncryptionMethod/@Algorithm attribute, not the
> EncryptedKey attribute.
>
> --Brent
>
>
> sermagico wrote:
>> 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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